Module 5 (B2) Digital Techniques / Electronic Instrument Systems

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133. The higher degree of integration of system and Flexibility for aircraft Designers, will be achieved by: a) The using analog technology. b) The usage of digital technology. c) The degradation of units

b) The usage of digital technology.

175. The operation of the logic gate, can be described by means of: a) Electronic components. b) Truth Table. c) AND gate only.

b) Truth Table.

99. When is a radio altimeter active? a) Up to 10,000 ft b) Up to 2,500 ft c) Up to 100 ft

b) Up to 2,500 ft

81. When will a NAND gate give logic 0 at the output? a) When both inputs are at 0 b) When both inputs are at 1 c) When the inputs are different

b) When both inputs are at 1

88. A fiber optic light source is normally: a) a filament lamp b) a laser or LED c) a strobe light

b) a laser or LED

60. A fiber optic data bus used on an aircraft: a) connects non-essential systems only b) can transmit on several channels at the same time c) can send only one message at a time

b) can transmit on several channels at the same time

90. ARINC Communications Addressing and Reporting Systems is used To: a) download aircraft status reports b) connect the aircraft to base c) make telephone calls

b) connect the aircraft to base

74. A typical fiber optic connector is: a) F-type connector b) coupling type, with lens fitted c) push-pull connector

b) coupling type, with lens fitted

1. An FMS system, besides controlling navigation, thrust and auto-nav, also provides: a) take-off and landing warnings b) dedicated status and warnings c) GPWS warnings

b) dedicated status and warnings

20. EICAS provides the following: a) engine parameters only b) engine parameters and system warnings only c) engine parameters and engine warnings only

b) engine parameters and system warnings only

13. An EADI display showing a moving runway moves down during the final stages of an approach. The aircraft must: a) fly up b) fly down c) hold descent path

b) fly down

118. The minimum requirement for an aeroplane CVR is: a) from power on b) from engine start c) from beginning of take off roll

b) from engine start

263.The octal number 73 is equivalent to the decimal number: (a) 47 (b) 59 (c) 111.

(a) 47

302.The typical core diameter for a mono-mode fiber is : (a) 5 μm (b) 50 μm (c) 125 μm.

(a) 5 μm

279. The conversion time of a flash ADC is typically in the range: (a) 50 ns to 1 μs (b) 50 μs to 1 ms (c) 50 ms to 1 s.

(a) 50 ns to 1 μs

270. A DAC can produce 256 different output voltages. This DAC has A resolution of: (a) 8 bits (b) 128 bits (c) 256 bits.

(a) 8 bits

405.Adjacent phosphors of blue and green are illuminated on the screen of a CRT. The resultant color produced will be: (a) Cyan (b) white (c) magenta.

(a) Cyan

242. The aircraft slip indicator is found in the: (a) EADI (b) ECAM (c ) C Ts in the passenger cabin.

(a) EADI

241. Engine parameters such as turbine speed, are displayed on: (a) ECAM (b) EHSI (c ) EADI.

(a) ECAM

333. Engine parameters are displayed on: (a) ECAM (b) EHSI (c) CDU.

(a) ECAM

321. OSS and UMS are specific classes of: (a) LS b) LSAP (c) D LD.

(a) LS

374. In the assembly language instruction MOV AX,07FEh the operation code is: (a) MOV (b) AX (c) 07FE.

(a) MOV

249. The two sets of flight regulations that a pilot may fly by are: (a) VF and IF (b) VHF and IF (c ) VF and IFU.

(a) VF and IF

368. The processor instruction HLT is classed as: (a) a control instruction (b) a data transfer instruction (c) a logical instruction.

(a) a control instruction

400. Another name for a multiplexer is: (a) a data selector (b) a bus transceiver (c) a shift register.

(a) a data selector

330. Supply borne noise an be eliminated by means of: (a) a low-pass filter (b) a high-pass filter (c) a band-pass filter.

(a) a low-pass filter

287. The validity of an ARINC 429 data word is checked b using: (a) a parity bit (b) a checksum (c) multiple redundancy .

(a) a parity bit

352. The validity of an ARINC 429 data word is checked b using: (a) a parity bit (b) a checksum (c) multiple redundancy .

(a) a parity bit

410. The function of the final anode of a CRT is: (a) accelerating the electron beamm (b) deflecting the electron beam (c) controlling the brightness of the display

(a) accelerating the electron beam

363. Which computer bus is used to specify memory locations? (a) address b s (b) control b s (c) data b s.

(a) address b s

290. The maximum bit rate supported b ARINC 429 is: (a) 12.5 Kbps (b) 100 Kbps (c) 1 Mbps.

(b) 100 Kbps

355. The maximum bit rate supported by ARINC 429 is: (a) 12.5 Kbps (b) 100 Kbps (c) 1 Mbps.

(b) 100 Kbps

257. The binary number 10101 is equivalent to the decimal number: (a) 19 (b) 21 (c) 35.

(b) 21

407. A seven segment LED display has segments a, b, c , d, and g illuminated. The character displayed will be: (a) 2 (b) 3 (c) 5.

(b) 3

371. How many 16K × 4 bit DRAM devices will be required to provide 32 K bytes of storage? (a) 2 (b) 4 (c) 8.

(b) 4

297. The normal supply voltage for a TTL logic device is: (a) 2.5 V ±5% (b) 5 V ±5% (c) 12 V ±5%.

(b) 5 V ±5%

404. The spectral response of the human eye peaks at around: (a) 450 nm (b) 550 nm (c) 650 nm.

(b) 550 nm

260.The binary coded decimal (BCD) number 1001000 1 is equivalent to the decimal number: (a) 19 (b) 91 (c) 145.

(b) 91

343. A method used in modern aircraft for reporting in-flight faults to an engineering and monitoring ground station is: (a) TCAS II (b) ACARS (c) GPS.

(b) ACARS

267.The binary number 10110011 is equivalent to the hexadecimal number: (a) 93 (b) B3 (c) 113.

(b) B3

296. ARINC 573 is designed for use with: (a) INS (b) FDR (c) Weather radar.

(b) FDR

361. ARINC 573 is designed for use with: a) INS (b) FDR (c) Weather radar.

(b) FDR

364. What is the largest hexadecimal address that can appear on a 24-bit address b s? (a) FFFF (b) FFFFF (c) FFFFFF.

(b) FFFFF

320. Electronic Engine Control (EEC) software is an example of: (a) D LD (b) LSAP (c) OSS.

(b) LSAP

391. Which one of the following scales of integration is the largest? (a) SSI (b) LSI (c) MSI.

(b) LSI

383. In which cycle is an instruction fetched and decoded: (a) M0 (b) M1 (c) M2.

(b) M1

396.An integrated circuit bus transceiver contains 64 logic gates and buffers. This chip is an example of: (a) SSI (b) MSI c) LSI.

(b) MSI

394.Which one of the following integrated circuit packaging technologies requires that the chip should always be soldered in place? (a) DIL (b) SOIC (c) PGA.

(b) SOIC

341. In an EFIS with three symbol generators, what is the purpose of the third symbol generator? (a) Comparison with the pilot‟s symbol generator (b) Standby in case of failure (c) To provide outputs for ECAM.

(b) Standby in case of failure

401. A four to one multiplexer has: (a) one select input (b) Two select inputs (c) four select input s.

(b) Two select inputs

342. The ACARS system uses channels in the : (a) HF spectrum (b) VHF spectrum (c) UHF spectrum.

(b) VHF spectrum

253. Typical displays on an EHSI are: (a) engine indications (b) VO , heading, track (c ) VO , altitude, rate of limb.

(b) VO , heading, track

415. The deflecting waveform supplied to the plates of an electrostatic CRT will be: (a) a sine wave (b) a ramp wave (c) a square wave.

(b) a ramp wave

291. An ARINC 429 NULL state is represented b : (a) a voltage of .5 V (b) a voltage of 0 V (c) a voltage of +5 V.

(b) a voltage of 0 V

356. An ARINC 429 NULL state is represented b : (a) a voltage of .5 V (b) a voltage of 0 V (c) a voltage of +5 V.

(b) a voltage of 0 V

239. Basic air data instruments are: (a) airspeed indicator, altimeter, and magnetic compass (b) airspeed indicator, altimeter, and vertical speed indicator (c ) airspeed indicator, vertical speed indicator, and artificial horizon.

(b) airspeed indicator, altimeter, and vertical speed indicator

329. Effective protection against lightning and static discharge damage to an air raft requires that: (a) all isolated conducting parts must have high resistance to ground (b) all parts of the metal structure of the air raft must be bonded to ground (c) all power and bus cables must be well insulated.

(b) all parts of the metal structure of the air raft must be bonded to ground

345. An advantage of a dual-ramp ADC is: (a) a fast conversion time (b) an inherent ability to reject noise (c) the ability to operate wit out the need for a clock.

(b) an inherent ability to reject noise

365. Bus arbitration is required in order to: (a) prevent memory loss (b) avoid b s contention (c) reduce errors ca used by noise and EMI.

(b) avoid b s contention

281. A bus that supports the transfer of data in both directions is referred to as: (a) universal (b) bidirectional (c) asynchronous.

(b) bidirectional

346. A bus that supports the transfer of data in both directions is referred to as: (a) universal (b) bidirectional (c) asynchronous.

(b) bidirectional

381. The CPU data bus buffer i : (a) unidirectional (b) bidirectional (c) omni-directional.

(b) bidirectional

280. The DAC used in a successive approximation ADC is usually: (a) ramp type (b) binary weighted type (c) successive approximation type.

(b) binary weighted type

283. Which one of the following is used to minimize reflections present in a bus cable? (a) coupler panels (b) bus terminators (c) shielded twisted pair cables.

(b) bus terminators

348. Which one of the following is used to minimize reflections present in a bus cable? (a) coupler panels (b) bus terminators (c) shielded twisted pair cables.

(b) bus terminators

402. Additional enable input s and output s are provided in some encoders in order to permit : (a) inverting (b) cascading (c) error detection.

(b) cascading

398. Each individual integrated circuit produced from a wafer is known as a: (a) blank (b) die (c) gate.

(b) die

248. EICAS provides the following: (a) engine parameters only (b) engine parameters and system warnings (c ) engine parameters and navigational data.

(b) engine parameters and system warnings

317. A Level B software classification is one in which the probability of failure is: (a) extremely i probable (b) extremely remote (c) remote.

(b) extremely remote

388. The advantage of pipelining is : (a) easier programming (b) faster execution time (c) more reliable operation.

(b) faster execution time

272. Which one of the following types of ADC is the fastest? (a) ramp type (b) flash type (c) successive approximation type.

(b) flash type

273. Which one of the following ADC types uses a large number of comparators? (a) ramp type (b) flash type (c) successive approximation type.

(b) flash type

335. The operational FMS database is: (a) updated once a month (b) is fed with information on aircraft weight before take off (c) needs no update information.

(b) is fed with information on aircraft weight before take off

300. In an optical fiber, the refractive index of the core is : (a) the same as the cladding (b) larger than the cladding (c) smaller than the cladding.

(b) larger than the cladding

271. In a bipolar ADC a logic 1 in the MSB position indicates: (a) zero input voltage (b) negative input voltage (c) positive input voltage.

(b) negative input voltage

409. The potential at the gird of a CRT is: (a) the same as the cathode (b) negative with respect to the cathode (c) positive with respect to the cathode.

(b) negative with respect to the cathode

276.The process of sampling approximating an analogue signal to a series of discrete levels is referred to as: (a) interfacing (b) quantizing (c) data conversion.

(b) quantizing

366. A memory device in which any item of data can be retrieved with equal ease is known as: (a) parallel access (b) random access (c) sequential access

(b) random access

412. The three beams in a color CRT are associated with the colors: (a) red, yellow and blue (b) red, green and blue (c) green, blue and yellow.

(b) red, green and blue

307. A significant advantage of fiber optic network in large passenger aircraft Is: (a) lower installation co t (b) reduced weight (c) ea e of maintenance.

(b) reduced weight

245. The EFIS fitted to a large air raft usually consists of: (a) a single multi-function display (b) separate primary flight and navigation displays (c ) a primary display with several standby instruments.

(b) separate primary flight and navigation displays

376. The stack is used for: (a) permanent storage of data (b) temporary storage of data (c) temporary storage of program .

(b) temporary storage of data

299. In a binary count r, the clock input of ach bi-stable stag is fed from: (a) the same clock line (b) the Q output of the previous stag (c) the CLEA line .

(b) the Q output of the previous stag

252. The term „artificial horizon‟ is sometimes used to describe the indication produced by: (a) the altimeter (b) the attitude indicator. (c ) the vertical speed indicator.

(b) the attitude indicator.

386. When executing the assembly language instruction MOV AX,07FEh the operation code will be transferred to: (a) the accumulator (b) the instruction register (c) the instruction pointer.

(b) the instruction register

338. On a flight deck EFIS system, if all of the displays were missing information from a particular source , the most likely cause would be : a) the symbol generator and display (b) the sensor, input bus or display controller (c) the display controller and symbol generator.

(b) the sensor, input bus or display controller

369. The VME b s standard uses: (a) a single 32-way DIN 41612 connector (b) two 32-way DIN 41612 connectors (c) a 100-way PCB edge connector.

(b) two 32-way DIN 41612 connectors

322. The final stage of loading EEC software is: (a) disconnecting the PDL (b) verifying the loaded software (c) switching on and testing the syste .

(b) verifying the loaded software

247. The flight director system receives information: (a) only from the VO /localizer (b) only from the attitude gyro and altimeter (c ) from both of the above.

(c ) from both of the above.

251. A major advantage of EFIS is a reduction in: (a) effects of EMI (b) wiring and cabling (c ) moving parts present in the flight deck.

(c ) moving parts present in the flight deck.

246. In a basic T- configuration of instruments: (a) the ADI appears on the left and the ASI appears on the right (b) the ADI appears on the left and the HSI appears on the right. (c ) the ASI appears on the left and the altimeter appears on the right.

(c ) the ASI appears on the left and the altimeter appears on the right.

236. Static pressure is fed: (a) only to the airspeed indicator (b) only to the airspeed indicator and vertical speed indicator (c ) to the airspeed indicator as well as the altimeter and vertical

(c ) to the airspeed indicator as well as the altimeter and vertical

309. The typical resistance of a wrist strap lead is: (a) 1 B (b) 1 kB (c) 1 MB.

292. The maximum data rate supported MIL-STD- 1553 is: (a) 12.5 Kbps (b) 100 Kbps (c) 1 Mbps.

357. The maximum data rate supported MIL-STD- 1553 is: (a) 12.5 Kbps (b) 100 Kbps (c) 1 Mbps.

275. A 10-bit DAC is capable of producing: (a) 10 different output levels (b) 100 different output levels (c) 1,024 different output levels.

399. A standard TTL logic gate has a fan-out of: (a) 1 (b) 5 (c) 10.

362. The maximum data rate supported by the FDDI bus is: (a) 1 Mbps (b) 10 Mbps (c) 100 Mbps.

258. The decimal number 29 is equivalent to the binary number: (a) 10111 (b) 11011 (c) 11101.

387. After executing the assembly language instruction MOV AX,07FEh the binary data in the AL register will be: (a) 11101111 (b) 00000111 (c) 11111110.

262. Which one of the following numbers could NOT be an octal number? (a) 11011 (b) 771 (c) 139.

266 .The hexadecimal number C9 is equivalent to the decimal number: (a) 21 (b) 129 (c) 2 1.

295. The length of an ARINC 429 word is: (a) 16 bits (b) 20 bits (c) 32 bits.

264.The binary number 100010001 is equivalent to the octal number: (a) 111 (b) 273 (c) 421.

265. The hexadecimal number 111 is equivalent to the octal number: (a) 73 (b) 273 (c) 421.

403. The peak wavelength of light emitted from a red LED is typically: (a) 475 nm b) 525 nm (c) 635 nm.

373. A semiconductor memory consists of 256 rows and 256 columns. The capacity of this memory will be: (a) 256 bits (b) 512 bits (c) 64K bits.

408.The BCD input to a seven segment display decoder is 1001. The digit displayed will be: (a) 7 (b) 8 (c) 9.

305. What aircraft standard applies to fiber optic network ? (a) ARINC 429 (b) ARINC 573 (c) ARINC 636.

332. The standard for ACARS is defined in: (a) ARINC 429 (b) ARINC 573 (c) ARINC 724.

319. Weather radar is an example of: (a) Class B software (b) Class C software (c) Class D software

367. Which one of the following memory devices can be erased and reprogrammed? (a) Mask programmed ROM (b) OTP EPROM (c) EPROM.

385. An external device can gain the attention of the CPU by generating a ignal on the: (a) R/W line (b) RESET line (c) IRQ line.

370. What type of memory uses the principle of charge storage? (a) bipolar static RAM (b) MOS static memory (c) MOS dynamic memory.

392. A microprocessor is an example of:: (a) SSI technology (b) MSI technology (c) VLSI technology.

310.which one of the following devices is most susceptible to damage from stray static charges: (a) a power rectifier (b) a TTL logic gate (c) a MOSFET transistor.

379. Data can be transferred from one bus to another by mean of: (a) a bus cycle (b) a bus buffer (c) a bus bridge.

414. The final anode of a CRT display requires: (a) a low voltage AC supply (b) a high voltage AC supply (c) a high voltage C supply.

301. A suitable optical transmitter for use with an optical fiber i : (a) a photodiode (b) a phototransistor (c) a low-power laser diode.

325. The display produced by a spectrum analyzer shows: (a) frequency plotted against time (b) amplitude plotted against time (c) amplitude plotted against frequency.

293. A bus that is self-clocking is referred to as: (a) universal (b) bidirectional (c) asynchronous.

358. A bus that is self-clocking is referred to as: (a) universal (b) bidirectional (c) asynchronous.

298. A two-input NAND gate will produce a logic 0 output when: (a) both of the inputs are at logic 0 (b) either one of the inputs is at logic 0 (c) both of the inputs are at logic 1.

417. The patterns required to display alphanumeric character in a CRT controller are stored in: (a) static RAM (b) dynamic RAM (c) character generator ROM.

372. A memory device has a pin marked CAS. The function of this pin is: (a) chip active select (b) control address signal (c) column address select.

324. EMI an be conveyed from a source to a receiver by: (a) conduction only (b) radiation only (c) conduction and radiation.

288. The label field in an ARINC 429 data word consists of: (a) five bits (b) three bits (c) eight bits.

353. The label field in an ARINC 429 data word consists of: (a) five bits (b) three bits (c) eight bits.

256. The upper ECAM display provides: (a) navigation information (b) secondary flight information (c) engine parameters.

340. The FMS navigation database is updated: (a) at the request of the flight crew (b) during pre -flight checks (c) every 28 days.

389. Segmentation is used with x86 process or in-order to: (a) increase the speed of processing (b) set up an instruction pipeline (c) extend the addressing range.

377. The stack is a structure located: (a) in the ALU b) in the general purpose register (c) in external read/ rite memory.

274. T e advantage of an R-2R ladder DAC is that: (a) it uses less resistors overall (b) it uses a smaller number of analogue switches (c) it avoids having a large number of different value resistors.

308. A particular problem with the build-up of static charge is that: (a) it is worse when wet (b) it is invariably lethal (c) it cannot easily be detected.

316. A Level C software classification is one in which a failure could result in: (a) aircraft loss (b) fatal injuries to passengers or crew (c) minor injuries to passengers or crew.

311. The static voltage generated when a person walks across a carpet can be: (a) no more than about 10 kV (b) between 10 kV and 20 kV (c) more than 20 kV.

337. A single failure in a fly-by-wire system should: (a) cause the system to revert to mechanical op ration (b) result in immediate intervention by the flight crew (c) not have any effect on the operation of the system.

411. Electromagnetic deflection of a CRT uses: (a) oils inside the CRT (b) X- and Y-plates inside the CRT (c) oils around the neck of the CRT.

312. Which of the materials listed is negative on the tribo-electric scale? (a) glass (b) silk (c) polyester.

282. The main advantage of using a serial bus in an aircraft is: (a) there is no need for data conversion (b) it supports the highest possible data rates (c) reduction in the size and weight of cabling.

347. The main advantage of using a serial bus in an aircraft is: (a) there is no need for data conversion (b) it supports the highest possible data rates (c) reduction in the size and weight of cabling.

277. In a binary weighted DAC the voltage gain for each digital input is determined by: (a) a variable slope ramp (b) a variable reference voltage (c) resistors having different values.

326. EMI an be reduced by means of: (a) screening only (b) screening and filtering (c) screening, bonding and filtering.

286. The physical bus media specified in ARINC 629 is: (a) fiber optic (b) coaxial cable (c) shielded twisted pair.

351. The physical bus media specified in ARINC 629 is: (a) fiber optic (b) coaxial cable (c) shielded twisted pair.

413. When compared with CRT displays, AMLC displays have: (a) larger volume and lower reliability (b) larger volume and greater reliability (c) smaller volume and greater reliability.

331. Noise generated by a switching circuit is worse when: (a) switching is fast and current is low (b) switching is slow and current is high (c) switching is fast and current is high.

303. In a multi-core fiber optic cable: (a) the core are color coded (b) the cladding i color coded (c) the buffer are color coded.

344. In a successive approximation ADC, the time interval between the SC and EOC signals is: (a) the clock time (b) the cycle time (c) the conversion time.

278. The resolution of a DAC is stated in terms of: (a) the accuracy of t e voltage reference (b) the open-loop gain of t e comparator (c) the number of bits used in t e conversion.

318. A software Configuration Management Plan (CMP) must be created and maintained by: (a) the CAA or AA (b) the aircraft operator (c) the relevant DO.

334. A basic IRS platform has: (a) three accelerometers and two laser gyros (b) two accelerometers and three laser gyros (c) three accelerometers and three laser gyros.

395. The connections from the pads on an integrated circuit die are: (a) soldered to the internal wire links (b) crimped to the internal wire links (c) welded to the internal wire links.

306. In order to support a high data rate, a fiber optic cable should have: (a) zero bandwidth (b) limited bandwidth (c) wide bandwidth.

52. Centralized Aircraft Monitoring System: a) performs in-flight and ground tests of aircraft systems by carrying out a BITE interrogation b) give red warnings and amber cautions to display system status c) performs in-flight BITE interrogation only

b) give red warnings and amber cautions to display system status

240.Three airborne parameters that an be used to assess air raft Position are: (a) airspeed, height and weight b) heading, airspeed and height (c ) heading, weight and airspeed.

b) heading, airspeed and height

126. The FMS Operational Data Base is: a) updated once a month b) is fed with information on aircraft weight, cruise altitude and cost index before take off c) needs no update information

b) is fed with information on aircraft weight, cruise altitude and cost index before take off

119. The output of a NOT gate is logic 1. The input is : a) logic 1 b) logic 0 c) both logic 1

b) logic 0

8. The recording medium in an FDR is: a) a high density floppy disc b) magnetic tape coated with ferrite c) copper foil coated with ferrite

b) magnetic tape coated with ferrite

43. A symbol generator displays ESDs warning. During replacement: a) you must wear a wrist strap connected to an approved earth point b) make sure the pins are not touched and covers fitted c) you must earth the unit to the airframe structure

b) make sure the pins are not touched and covers fitted

103. The 'fan-in' in a gate is the : a) number of outputs from a gate b) number of inputs to a gate c) number of inputs and outputs of a gate

b) number of inputs to a gate

44. An FDR fitted to a helicopter begins recording: a) on take-off b) on engine start-up c) when power is applied to the aircraft

b) on engine start-up

53. The Centralized Aircraft Monitoring System uses the maintenance mode of operation: a) in the air only b) on the ground only c) either in the air or on the ground

b) on the ground only

68. Fly By Wire systems in the fully active mode, the actuators will: a) both be active b) one in active mode, one in damping mode c) both be in damping mode, awaiting control inputs

b) one in active mode, one in damping mode

19. The inputs and outputs of a CADC are: a) pitot and static in; altitude, attitude, CAS and VS out b) pitot and static in; altitude, CAS, mach and VS out c) pitot in; static, altitude, mach, CAS and VS out

b) pitot and static in; altitude, CAS, mach and VS out

2. EADI sky and ground display is provided by: a) synthetic TV signals b) raster scan c) stroke pulse

b) raster scan

123. Pitch Control of a fly by wire system is achieved by: a) elevators only b) stabilizer and elevator c) stabilizer only

b) stabilizer and elevator

50. Before an IRS can complete the alignment sequence : a) the shutdown present position must be entered b) the current present position must be entered c) either the last or current position must be entered

b) the current present position must be entered

33. On an EADI, the Flight Director command bars show : a) the actual path with respect to the required path b) the required path with respect to the actual path c) the path with respect to the horizon

b) the required path with respect to the actual path

92. The basic principle of radar is based upon: a) the amount of power in the signal returned b) the time delay between outward and returning pulse c) ultrasonic wave propagation

b) the time delay between outward and returning pulse

57. An IRS platform has: a) two accelerometers b) three accelerometers c) two or three accelerometers depending on the system

b) three accelerometers

69. The parity bit in digital information is used: a) for BITE programs b) to check the validity of data information c) to check the status of the system

b) to check the validity of data information

167. What is the name of the gate, which is combination of AND gate and an Inverter? a)AND gate. b)NAND gate. c)NOR gate.

b)NAND gate.

214. The display which produces light, when electrically activated is known as: a- Passive display. b- Active display. c- Fail passive display

b- Active display.

217. Electro static charge, generated due to: a- different phase between current and voltage. b- Friction between different materials. c- High voltage in the circuit.

b- Friction between different materials.

211. LCD stands for: a- Liquid Control display . b- Liquid Crystal Display. c- Light control display.

b- Liquid Crystal Display.

205. The transmission of light in any optical fiber, depends on: a- Outer covering materials. b- Optical property of total internal reflection. c- Cladding material.

b- Optical property of total internal reflection.

226. The control and certification of software in aircraft systems and components is laid down in: a-Annex 1. b-Airworthiness Notices 45 and 45A.(AWN 45.,45A) c-Air low.

b-Airworthiness Notices 45 and 45A.(AWN 45.,45A)

199. The computer, which has a combination of the amplitude of input signals and analog circuitry, to produce output of continuous voltage or current. Is known as: a-Digital computer. b-Analog computer. c-Flight management system

b-Analog computer.

228. The E.M.I. stands for: a-Electromagnetic indicator. b-Electromagnetic Interference. c-Electromagnetic Image.

b-Electromagnetic Interference.

209 LED (light emitting diode) emits light when: a-It is reverse biased. b-It is Forward biased. c-It has no current flow through it

b-It is Forward biased.

196. What is the name of a memory device, from which data can repeatedly be read out but can not written into it? a-Random access memory. b-Read only memory. c-Dynamic ram device.

b-Read only memory.

135- The application type or task of computer are: a) Reference, information. and storage/monitor. b) Controlling, Interactive. c) Answer "A" and "B" both can be.

c) Answer "A" and "B" both can be.

149. Which stated below, indicate binary subtraction rules. a) 0 - 0 = 0 , 1 - 0 = 1 b) 1 - 1 = 0 , 0 - 1 = 1 c) Answer "A" and "B" both correct.

c) Answer "A" and "B" both correct.

181. The M.P.U. is similar to: a) Memory. b) A.L.U. c) C.P.U.

c) C.P.U.

95. What systems does the ADC feed? a) Altimeter / FMS / secondary radar b) Standby altimeter/mach meter c) Cabin pressure controller sensor / mach meter / Altimeter

c) Cabin pressure controller sensor / mach meter / Altimeter

45. MIL-ST-1533 is a data bus for: a) Flight Data Recorders b) Inertial Reference System c) Digital Information Transfer System

c) Digital Information Transfer System

154. System information has to be transmitted to the peripherals, in the form of ................ Or ......... .............. signal and are known as ............. : a) Mechanical - Electrical - CPU. b) Electrical - Mechanical - ALU. c) Electrical - Fiber optic - Data Buses.

c) Electrical - Fiber optic - Data Buses.

171. The system for mathematically analysis of logic system , is known as: a) Boolean algebra. b) Geometry. c) Exclusive gate.

c) Exclusive gate.

82. Convert decimal 15 into hexadecimal: a) E b) G c) F

c) F

48. The FMS can update the IRS position outputs by using information from either: a) VOR and DME only b) DME and GPS only c) GPS, DME, LOC and VOR

c) GPS, DME, LOC and VOR

91. With radio coupled autopilot, what are the inputs: a) ADF and ILS b) ADF and VOR c) ILS and VOR

c) ILS and VOR

75. Which of the following is an optoelectronic device? a) Triac b) Thyristor c) Laser Diode

c) Laser Diode

170. The below Boolean expression , Indicate: ___ A 0 B = S a) AND logic gate. b) OR logic gate. c) NAND logic gate.

c) NAND logic gate.

15. Adding invertors to the two inputs of an AND gate makes a : a) NAND gate b) OR gate c) NOR gate

c) NOR gate

179. The circuit shown below, performs a logic: a)AND gate b) NAND gate c) NOR gate

c) NOR gate

138.What is the name of computer, which is used for a source of information or data? A) Storage computer. b) Controlling computer. c) Reference computer.

c) Reference computer.

55. EFIS displays of the right hand and left hand displays are compared by comparators in the: a) FMS b0) EICAS c) Symbol Generators

c) Symbol Generators

28. What is the fixed feature of an ADI? a) The glide-slope pointer b) The lateral deviation bar c) The aircraft symbol

c) The aircraft symbol

24. Where are the Digital Flight Data Recorder outputs supplied to? a) The recording unit b) Flight instruments c) There are no outputs

c) There are no outputs

184. The most important characteristics of any microprocessor is: a) Memory capacity. b) C.P.U. c) Word length.

c) Word length.

41. Continuity of a fiber optic cable is checked by: a) a light source and an opto-power meter b) a calibrated light source c) a calibrated light source and an optometry

c) a calibrated light source and an optometry

6. A fiber optic cable consists of a) a plastic core with a cladding having a higher refractive index b) a silica glass core with a cladding having a higher refractive index c) a silica glass core with a cladding having a lower refractive index

c) a silica glass core with a cladding having a lower refractive index

27. If a signal has quantity in volts and physical position it is: a) digital b) synchronous c) analogue

c) analogue

63. An AND gate output is 1 when inputs are: a) both 0 b)1 and 0 c) both 1

c) both 1

106. For a fiber optic cable connector that is not regularly disconnected you would use the: a) ceramic lens type b) ball lens type c) butt type

c) butt type

10. What does the CADC feed : a) Altimeter / FMS / secondary radar b) standby altimeter / mach meter c) cabin pressure controller sensor / mach meter / altimeter

c) cabin pressure controller sensor / mach meter / altimeter

46. Making an invertors from a NAND or NOR gate is achieved by: a) inverting the input b) connecting two in series c) connecting the inputs

c) connecting the inputs

109. To stop earth loops forming, you would: a) leave both ends of the cable screen open circuit b) earth both ends of the cable screen c) earth only one end of the cable screen

c) earth only one end of the cable screen

31. An FMS navigation database is updated: a) at the operators request b) once a month c) every 28 days

c) every 28 days

129. A Liquid Crystal Display (LCD) has the advantage over a CRT Because: a) it displays more colors b) it requires less servicing c) it requires no cooling

c) it requires no cooling

178. In order to energize the relay in the circuit shown below, the logic state at the input must be: a) logic 0 at points A and B b) logic 0 at point A and logic 1 at point B A B c) logic 1 at both points

c) logic 1 at both points

47. The FMS databases consist of: a) one navigation and one performance database b) two performance and one navigation database c) one performance and two navigation databases

c) one performance and two navigation databases

3. HSI heading is valid if the heading flag is : a) in view b) green c) out of view

c) out of view

104. Very Large Scale Integrated (VLSI) means the number of gates in a single IC is: a) up to 1000 b) up to 10,000 c) over 10,000

c) over 10,000

120. An Inertial Navigation System (INS/IRS) computes distance from acceleration by: a) a simple integration b) a differentiation followed by an integration c) two successive integrations

c) two successive integrations

42. To shield a fiber optic from EMI you must: a) earth both transducer and couplings b) shield it with a braided shield c) use an opto-isolator

c) use an opto-isolator

40. HIRF is prevented from entering a fiber optic cable by: a) enclosing it in a metal braid b) grounding the fiber at both ends c) using an opto-isolator coupling

c) using an opto-isolator coupling

218. The material, which store, electrostatic charge is: a- A conductive materials. b- A semiconductor materials. c- A non-conductive materials

c- A non-conductive materials

161. What are the logical gates? a) AND, OR, NOT. b) Exclusive OR , Exclusive NOR. c- AND, OR, NAND, NOR, Exclusive OR, NOT.

c- AND, OR, NAND, NOR, Exclusive OR, NOT.

204. What are the elements of an optical fiber? a- Central core of suitable glass material. b- Outer cladding with lower refracting index. c- All above answer are correct

c- All above answer are correct

416. The typical value of maximum forward current for an LED indicator is: (a) 0.03 A (b) 0.3 A (c) 3 A.

(a) 0.03 A

261.The decimal number 37 is equivalent to the binary coded decimal (BCD) number: (a) 00110111 (b) 00100101 (c) 00101111.

(a) 00110111

259. Which one of the following gives the two ‟s complement f the Binary number 1 11 ? (a) 01010 (b) 01001 (c) 10001.

(a) 01010

304. The typical wavelength of light in a fiber is : (a) 1.3 μm (b) 13 μm

(a) 1.3 μm

269.The number 70 6 8 is equivalent to : (a) 1C616 (b) 11100 1110 2 (c) 484110

(a) 1C616

235.Which standby instruments are driven from the aircraft‟s pitot- Static system? (a) airspeed indicator, altimeter, and vertical speed indicator (b) airspeed indicator, vertical speed indicator, and magnetic compass (c ) airspeed indicator, altimeter, and angle of attack indicator.

(a) airspeed indicator, altimeter, and vertical speed indicator

390. A standard logic gate is a typical example of: (a) an SSI device (b) an LSI device (c) a VLSI device.

(a) an SSI device

255. Operational faults in FMS an be detected by: (a) automatically comparing outputs on a continuous basis (b) routine maintenance inspection of the air raft ( c) pre-flight checks.

(a) automatically comparing outputs on a continuous basis

397. Production tests are performed on an integrated circuit wafer: (a) before cutting it into individual hips (b) after cutting it into individual hips (c) only when the hips are finally mounted.

(a) before cutting it into individual hips

418. When compared with passive matrix LCD , AMLCD are: (a) faster and sharper (b) faster and less sharp (c) slower and less sharp.

(a) faster and sharper

294. The physical bus media specified in MIL- STD-1773B is: (a) fiber optic (b) coaxial cable (c) shielded twisted pair.

(a) fiber optic

359. The physical bus media specified in MIL- STD-1773B is: (a) fiber optic (b) coaxial cable (c) shielded twisted pair.

(a) fiber optic

339. A central maintenance computer provides: (a) ground and in-flight monitoring and testing (b) ground and BITE testing using a portable control pan l (c) display of system warnings and cautions.

(a) ground and in-flight monitoring and testing

313. When transporting ESD it is important to: (a) keep them in a conductive package b) remove them and place them in metal foil (c) place them in an insulated plastic package

(a) keep them in a conductive package

328. The typical maximum value of bonding resistance is: (a) less than 0.005 M (b) between 0.005 M and 0.05 M (c) more than 0.05 M.

(a) less than 0.005 M

393. When compared with DIP packaging, PLCC offers: (a) more pins (b) larger size (c) greater reliability.

(a) more pins

315.Which one of the following items of clothing is most likely to cause static problems? (a) nylon overalls (b) a cotton T-shirt (c) polyester-cotton trousers.

(a) nylon overalls

406. The human eye is most sensitive to: (a) red light (b) blue light (c) green light.

(a) red light

323. A periodic noise is: (a) regular but not continuous (b) regular and continuous (c) entirely random in nature.

(a) regular but not continuous

284. The data format in an ARINC 429 stub cable consists of: (a) serial analogue doublets (b) parallel data from the local bus (c) Manchester encoded serial data.

(a) serial analogue doublets

349.The data format in an ARINC 429 stub cable consists of: (a) serial analogue doublets (b) parallel data from the local bus (c) Manchester encoded serial data.

(a) serial analogue doublets

375. A bus arbitration system based on the physical location of cards is referred to as: (a) serial arbitration (b) parallel arbitration (c) sequential arbitration.

(a) serial arbitration

254. In a basic T- configuration of instruments: (a) the ADI appears at the top and the HSI appears at the bottom (b) the HSI appears at the top and the ASI appears at the bottom (c) the ASI appears at the top and the ADI appears at the bottom.

(a) the ADI appears at the top and the HSI appears at the bottom

378. A byte of data is to be inverted. This task is performed by: (a) the ALU (b) the instruction register (c) the instruction decoder.

(a) the ALU

238. The horizontal situation indicator (HSI) uses information derived from: (a) the VO receiver (b) the pitot-static system (c ) the airspeed indicator.

(a) the VO receiver

380. The output of the instruction pointer appear on: (a) the address bus (b) the data bus (c) the control bus .

(a) the address bus

250. Secondary heading information is obtained from: (a) the gyro (b) the compass (c ) the pitot-static system.

(a) the gyro

382. Another way to describe the CPU register that act as an instruction pointer is : (a) the program counter (b) the stack pointer (c) the instruction register

(a) the program counter

238. The term „glass cockpit‟ refers to: (a) the use of LCD and C T displays (b) the use of toughened glass windows

(a) the use of LCD and C T displays

244. Under visual flight rules (VF ) the pilot‟s most important sour e of Information concerning the air raft‟s position and attitude is: (a) the view out of the cockpit window (b) the altimeter and vertical speed indicators (c ) the airspeed indicator and the magnetic compass.

(a) the view out of the cockpit window

285. In order to represent negative data values, BNR data uses: (a) two‟s complement binary (b) BCD data and a binary sign bit. (c) an extra parity bit to indicate the sign

(a) two‟s complement binary

350. In order to represent negative data values, BNR data uses: (a) two‟s complement binary (b) BCD data and a binary sign bit. (c) an extra parity bit to indicate the sign

(a) two‟s complement binary

314. To reduce the risk of damaging an ESD during soldering it is important to: (a) use only a low- voltage soldering iron (b) use only a mains operated soldering iron (c) use only a low-temperature soldering iron.

(a) use only a low- voltage soldering iron

289. The voltages present on an ARINC 429 d a t a bus cable are: (a) ±5 V (b) ±15 V (c) +5 V and +10V

(a) ±5 V

354.The voltages present on an ARINC 429 d a t a bus cable are: (a) ±5 V (b) ±15 V (c) +5 V and +10V

(a) ±5 V

336. The left and right cockpit displays: (a) are supplied from separate symbol generators at all times (b) are supplied from the same symbol generator (c) will only b supplied from the same symbol generator when all Other symbol generators have failed.

268.The hexadecimal number AD is equivalent to the binary number: (a) 10101101 (b) 11011010 (c) 10001101.

...

327. The effects of HIRF an be reduced by: (a) screening only (b) screening and filtering (c) screening, bonding and filtering.

...

137. For adaptation of a computer on several different airframes: a) Program must be changed. b) Strapping Pins should be used. c) Potentiometer is used.

b) Strapping Pins should be used.

21. During an instrument approach, the glide slope pointer deflect below the glide-slope centre mark. This means the aircraft is positioned: a) above the glide-slope b) below the glide-slope c) to the left of the localizer

a) above the glide-slope

97. Physical variables in quantitative forms, such as voltage or angular rotation of a shaft are: a) analogue b) digital c) binary

a) analogue

122. An IRS system requires data for wind computation from: a) central Air Data Computer b) satellites c) Doppler System

a) central Air Data Computer

131. What Logic Gate does this switch circuit indicate? a) AND gate b) OR gate c) NOR gate

b) OR gate

67. What is the main disadvantage of a fiber optic data bus? a) Bend radius and moisture ingress at connections b) Less strong and durable when compared to twisted pair and coaxial cable c) Expensive to install

a) Bend radius and moisture ingress at connections

132. Digital Computer Processes information in a : a) Binary State. b) Unique Application. c) Analog fashion

a) Binary State.

145. The 0 and 1 are two binary digit, which is known as: a) Bits. b) Words. c) Frame.

a) Bits.

162. The logical gates are made-up of electronic components, and output can be presented by: a) Boolean Algebra. b) Newton‟s law. c) Bernoulli law.

a) Boolean Algebra.

172. The system for mathematical analysis of logic system , is known as: a) Boolean algebra. b) Geometry. c) Trigonometry

a) Boolean algebra.

166. The equivalent circuit for an AND gate is: a) Parallel circuits. b) Series circuits. c) Combination circuits.

b) Series circuits.

85. What is 345 in binary? a) 101011001 b) 110011001 c) 100111001

a) 101011001

101. The decimal number 7 expressed as a binary number is: a) 111 2 b) 7 2 c) 101 2

a) 111 2

78. Convert the hexadecimal number D into decimal: a) 13 b) 14 c) 14

a) 13

115. The binary number 11010111 is expressed as a decimal is: a) 215 b) 107 c) 53

a) 215

384. If a microprocessor clock runs at 50 MHz, an instruction requiring 11 T- state will execute in a time of: a) 220 n (b) 440 n (c) 2.2 m

a) 220 n

64. What is hex 110 in decimal: a) 272 b) 282 c) 32

a) 272

110. How many satellite signals are required to achieve precise 3D positioning? a) 4 b) 5 c) 6

a) 4

116. The octal number 1001 expressed as a decimal is: a) 513 b) 613 c) 713

a) 513

87. Convert 2C hex to octal: a) 54 b) 44 c) 35

a) 54

111. Binary addition of 1101 + 101101 is: a) 58 b) 61 c) 70

a) 58

98. Within a 3 bit frequency cascade, division is to: a) 8 b) 4 c) 2

a) 8

100. The binary coded decimal number 10011000 expressed as a decimal number is: a) 98 b10 b) 152 10 c) 152 2

a) 98 b10

114. An aircraft may have been HIRF affected: a) A static wick check is required b) A bonding load check is required c) Test all radio frequencies for interference

a) A static wick check is required

112. What system uses base 8? a) ARINC 429, in data word labels only b) ARINC 629 c) ARINC 573

a) ARINC 429, in data word labels only

29. What information is required before completion of the alignment of an Inertial Navigation System? a) Aircraft present position b) Aircraft present position and heading c) Heading and attitude

a) Aircraft present position

183. The fundamental unit of information used in the computer is: a) Word. b) Alphabet. c) Octal.

a) Word.

84. What is the definition of level one software? a) Critical b) Essential c) Non-essential

a) Critical

153. The circuits used to interface digital computers to the analog world are known as: a) D/A converter. b) A/D converter. c) Discrete circuit.

a) D/A converter.

136. Digital computers use input, which are ........ ........... or ....... And ... a) Digital signal --- High - Low. b) Analog signal --- Peak - Peak./ c) Hybrid signal --- High - Low.

a) Digital signal --- High - Low.

51. What warnings can an FMS provide? a) Discrete warnings b) Spurious faults c) Ground faults only

a) Discrete warnings

243. Where is the „rising runway‟? a) EADI (b) ECAM (c ) C Ts in the passenger cabin.

a) EADI

34. What instrument includes a display of a rising runway? a) EADI b) EHSI c) ECAM

a) EADI

22. Engine parameters are displayed on: a) ECAM b) EHSI c) FMSCDU

a) ECAM

93. Engine parameters are displayed on: a) ECAM b) EHSI c) CDU

a) ECAM

190. The combination of hardware and software is refer to: a) Firmware. b) Hard-Software. c) Hardware.

a) Firmware.

11. What kind of light is used in a fiber optic systems? a) Infrared b) Visible c) Ultraviolet

a) Infrared

140. The computer, which perform several different task, depending on operator inputs, is known as. a) Interactive computer. b) Controlling computer. c) Reference computer.

a) Interactive computer.

76. What is the advantage of a single mode fibre optic over ordinary wire? a) Large bandwidth b) Small bend radius c) Not prone to dam

a) Large bandwidth

141. In the numbering system, the LSD and MSD stands for: a) Least significant digit and most significant digit. b) Line signal display. c) Most signal distortion.

a) Least significant digit and most significant digit.

176. An apparatus, which made up of electronic circuitry , that generate an output based on the input of one or more variable is known as: a) Logic element. b) Oscillator. c) Amplifier.

a) Logic element.

160. Many different kind of logical outputs can be obtained by: a) Logic gates. b) Operational Amplifiers. c) Detector units.

a) Logic gates.

180. The M.P.U. stands for: a) Microprocessor unit. b) Maintenance Power Unit. c) Micro computer unit.

a) Microprocessor unit.

164. For more complicated decision: a) More logic elements needed. b) Only, one element required. c) Only one logic gate enough.

a) More logic elements needed.

168. An "OR" gate with all inputs inverted is similar to: a) NAND gate b) NOR gate. c) OR gate.

a) NAND gate

83. Which logic gate can be represented as a parallel circuit? a) OR b) Exclusive OR c) NAND

a) OR

39. Which logic gate can be represented as a parallel circuit? a) OR gate b) Exclusive OR gate c) NAND gate

a) OR gate

148. The MSB, in one,s complement method, is set to "0", it indicate: a) Positive number. b) Negative number c) Decimal number.

a) Positive number.

125. What must be entered into the IRS before the aircraft can be moved? a) Present position b) Flight plan c) Cruise height

a) Present position

59. What are the outputs of a Digital ADC: a) TAS, MACH, Altitude, TAT and SAT b) TAS, MACH and Altitude c)TAS, MACH, Altitude and TAT

a) TAS, MACH, Altitude, TAT and SAT

26. Who is responsible for the operational program of the FMS? a) The pilot b) The engineer c) The manufacturer

a) The pilot

156. The ARINC activity is: a) To produce specifications and reports. b) To supply electronics parts. c) To train in avionics field.

a) To produce specifications and reports.

12. Typical displays on an EHSI are: a) VOR, Map, Plan and weather radar b) VOR, Plan, Map and Attitude c) Engine indications

a) VOR, Map, Plan and weather radar

108. How are engine indications sent to the FDR? a) Via ARINC 573 b) Via ARINC 629 c) Source isolated

a) Via ARINC 573

89. What precautions are required when removing ESDS equipment a) Wear a wrist strap connected to an approved ground point b) Keep one hand on the airframe c) No special precautions are required

a) Wear a wrist strap connected to an approved ground point

62. Manufacturers of aircraft can ensure HIRF protection by: a) designing specific avionic areas that are shielded against HIRF b) ensuring all single wires are shielded with metal conduit c) advising operators of all points susceptible to deterioration due to corrosion, moisture ingress, flexing etc

a) designing specific avionic areas that are shielded against HIRF

25. FMS failure and warnings are; a) displayed on EICAS b) engine warnings only c) EFIS warnings only

a) displayed on EICAS

23. A central maintenance computer provides: a) ground and flight monitoring and testing on an on-board computer b) ground and BITE testing using a portable control panel c) display of system warnings and cautions

a) ground and flight monitoring and testing on an on-board computer

32. A single failure of a fly-by-wire system: a) has no effect on aircraft operation b) will limit the flight profile c) will reduce operational heights and speeds

a) has no effect on aircraft operation

121. Before the aircraft is moved from the loading pier the pilot must: a) insert the latitude and longitude of the pier into the IRS b) set the altitude to be fed into the INS c) insert the longitude and latitude of the first waypoint into the INS

a) insert the latitude and longitude of the pier into the IRS

7. The command bars on an ADI relate to: a) path required b) path being followed c) roll indications

a) path required

14. A flight data recorder can obtain information from aircraft Instruments: a) provided there is adequate isolation b) by direct connection to the instruments c) provided there is adequate damping

a) provided there is adequate isolation

105. The fiber optic cable can be identified on aircraft by its jacket color which is: a) purple b) red c) yellow

a) purple

58. IRS Laser Ring Gyros provide: a) rate movement about an axis b) displacement about an axis c) both rate and displacement about an axis

a) rate movement about an axis

61. Light travels along a fiber optic by : a) reflection b) refraction c) dispersion

a) reflection

127. An INS/IRS Battery Unit provides : a) standby power when airborne and on the ground b) standby power only whilst in flight c) standby power only on the ground

a) standby power when airborne and on the ground

128. IRS alignment: a) takes up to 10 minutes and the present position can be entered at any time during alignment b) takes up to 10 minutes and present position must be entered before alignment. c) takes up to 10 minutes and the previous flight shut down present position is used for the alignment

a) takes up to 10 minutes and the present position can be entered at any time during alignment

73. Control of software is by: a) the National Aviation Authority b) engineers c) the aircraft manufacturers

a) the National Aviation Authority

234. A multi-function display (MFD) an be: a) used only for basic flight information (b) configured for more than one type of information (c ) set to display information from the standby magnetic compass.

a) used only for basic flight information

187. The L.S.B. of computer word number, located: a)on the right of the number. b)On the left of the number. c) On the central of the number.

a)on the right of the number.

195. In computer application "K" means: a- 1024 bits. b- 4056 bits. c- 11224 bits.

a- 1024 bits.

212. The Cathode ray tube (CRT) is: a- An evacuated glass tube. b- An liquid crystal display. c- A diode.

a- An evacuated glass tube.

191. A binary digit is: a- Bit. b- Word. c- Map.

a- Bit.

221. The precautions necessary for safe handling of units, identified by: a- ESDS labels. b- Voice warning. c- Voltage indication.

a- ESDS labels.

215. E.F.I.S. stands for: a- Electronic Flight Instrument Systems. b- Liquid crystal display. c- Electronic fault isolation system.

a- Electronic Flight Instrument Systems.

206. The modes, by which light can be guided along a fiber optics depends on: a- Incident angle (Φ). b- Light intensity. c- Cladding material.

a- Incident angle (Φ).

208. The fiber optic link between, flight control computers and the actuator control electronics is: a-A two way system. b-A single way system. c-A four root system.

a-A two way system.

222. For identifying the ESD sensitive area or equipments, that contain ESDS device: a-A yellow caution sensitive label uses. b-A red caution label uses. c-A green label can be used.

a-A yellow caution sensitive label uses.

192. The element of computer which, store and retrieve, bit or words is Known as: a-C.P.U. b-A.L.U. c-Memory.

a-C.P.U.

216. The electrostatic charge or: a-Electrical energy at rest. b-Electrical energy, which has no voltage. c-Electrical energy, which has current flow.

a-Electrical energy at rest.

203. For high-speed transmission of data, by light: a-The Fiber Optics are used. b-The Microwave signal s are used. c-The R.F. signals are used.

a-The Fiber Optics are used.

36. If an EFIS has 3 symbol generators, what is the purpose of the 3rd symbol generator? a) Comparison with No.1 symbol generator b) Standby c) Parity function

b) Standby

35. In order to maintain HIRF protection, bonding checks between airframe and electrical components carrying voltages greater than 50 volts RMS or DC or main earth return should not exceed: a) 1 mega ohm b) 1 ohm c) 0.05 ohm

b) 1 ohm

143. The decimal numbering system, which is on base 10, has: a) 5 digits. b) 10 digits. c) 8 digits.

b) 10 digits.

147. Convert 9110 to binary form: a) 011011. b) 1011011. c) 110011.

b) 1011011.

5. An ARINC 429 binary coded decimal data word occupies bits: a) 11 to 28 b) 11 to 29 c) 1 to 8

b) 11 to 29

86. Convert 1D to binary: a) 29 b) 11101 c) 101001

b) 11101

79. Convert decimal 15 into binary: a) 1101 b) 1111 c) 1110

b) 1111

65. Convert the binary word 1100 to decimal : a) 16 b) 12 c) 11

b) 12

66. Convert the binary word 1110 to decimal: a) 12 b) 14 c) 15

b) 14

77. How many LRUs can be connected to an ARINC 429 data bus: a) 120 b) 20 c) 60

b) 20

80. Convert 448 to hex: a) 3616 b) 2416 c) 2216

b) 2416

37. FMS operational program is updated every: a) 7 days b) 28 days c) 90 days

b) 28 days

107. Binary Number: 110010 : a) 80 b) 50 c) 34

b) 50

71. Convert the binary number 110010 to decimal : a) 80 b) 50 c) 34

b) 50

96. 1012 converted to decimal is: a) 52 b) 510 c) 210

b) 510

17. The octal number 1001 expressed as a decimal is: a) 65 b) 513 c) 9

b) 513

169. The Boolean expression for OR gate is: a) A 0B = S. b) A + B = S ___ c) A + B = S.

b) A + B = S ___

158. The data bus is: a) A single wire. b) A pair of twisted wires with shielding. c) A coaxial cable.

b) A pair of twisted wires with shielding.

18. This truth table is for a: A B C 0 0 0 1 0 0 0 1 0 1 1 1 a) NAND gate b) AND gate c) OR gate

b) AND gate

4. A NOR gate with both inputs inverted becomes a: a) NAND gate b) AND gate c) OR gate

b) AND gate

155. The ARINC, stands for: a) Aircraft radio incorporation. b) Aeronautical radio incorporated. c) Aeronautical range indication.

b) Aeronautical radio incorporated.

163. What is the function of logic elements? a) They operates like amplifier. b) Allows digital circuits to make decision based on various input parameter. c) Current to flow in one way only.

b) Allows digital circuits to make decision based on various input parameter.

151. The real world is ............... in nature: a) Digital. b) Analog. c) Hybrid

b) Analog.

146. All input to digital computer must be converted to : a) Decimal number. b) Binary (0-1) c) Hexadecimal.

b) Binary (0-1)

174. The exclusive or gate indicate: a) Equal condition of inputs. b) Different condition of inputs. c) Availability of all inputs.

b) Different condition of inputs.

94. A flight deck CRT LRU is being replaced. What does the ESDS label indicate? a) Wrist straps should be worn b) Do not touch plug pins or leave them exposed c) Remove power before connecting

b) Do not touch plug pins or leave them exposed

70. On a Fly By Wire system, what controls the stab trim: a) ELAC b) ELAC and SEC c)SEC

b) ELAC and SEC

130. What is this symbol: a) Exclusive AND gate b) Exclusive OR gate c) Exclusive NOR gate

b) Exclusive OR gate

54. What functions are available on the EHSI? a) Full arc and Wx. only b) Full arc, Wx. and Map Mode c) Full Arc only

b) Full arc, Wx. and Map Mode

188. The physical equipment of a computer system is known as: a) Software. b) Hardware. C_ Instruction.

b) Hardware.

139.An example of reference computer is: a) Central Air Data computer(CADC). b) Inertial Reference System. c) E.I.C.A.S. Engine indication and crew alerting system.

b) Inertial Reference System.

182. What device is used for storing information and computer operation: a)A.L.U. device. b) Memory device. c) Input / output device.

b) Memory device.

72. What is serial to parallel and vice-versa called: a) Encoder/Decoder b) Multiplex/ De-multiplex c) Switching

b) Multiplex/ De-multiplex

150. The short method of adding a numbers to itself as many times as is specified. Is known as: a) Addition. b) Multiplication. c) Divider

b) Multiplication.

113. What sort of gate is this? a) Or gate b) NOR gate c) NOT gate

b) NOR gate

142. The decimal number 4572 is equal to: 2 3 1 0 a) (4x10 ) + (5x10 ) + (7x10 ) + (2x10 ). 0 2 3 1 b) (4x10) + (5x10) + (7x10) + (2x10). 3 2 1 0 c) (4x10) + (5x10) + (7x10) + (2x10).

c) (4x10) + (5x10) + (7x10) + (2x10).

38. What is 345 in binary? a) 100111001 b) 110011001 c) 101011001

c) 101011001

56. What is the approximate earth rate? a) 5º/hour b) 10º/hour c) 15º/hour

c) 15º/hour

16. The binary number 11010111 expressed as a decimal is: a) 207 b) 223 c) 215

c) 215

124. A basic IRS platform has: a) 3 accelerometers and 2 laser gyros b) 2 Accelerometers and 3 laser gyros c) 3 accelerometers and 3 laser gyros

c) 3 accelerometers and 3 laser gyros

49. The accepted error from INS/IRS is: a) 1 mile/hour + 3 miles b) 2 miles per hour + 3 miles c) 3 miles / hour + 3 miles

c) 3 miles / hour + 3 miles

360. The length of an ARINC 429 word is: (a) 16 bits (b) 20 bits c) 32 bits

c) 32 bits

102. Convert 011101 binary to octal: a) 25 b) 33 c) 35

c) 35

9. Convert 0111012 to octal : a) 25 b) 33 c) 35

c) 35

117. With a relative humidity of 10% to 20%, if you walked over a carpet what electrostatic voltage value would you expect to see? a) 6,000 volts b) 12,000 volts c) 35,000 volts

c) 35,000 volts

186. Each word contains: a) 10 bit. b) 6 bit. c) 8 bit

c) 8 bit

30. IRS accelerometers are mounted: a) 60o to each other b) 45o to each other c) 90o to each other

c) 90o to each other

144. The binary system has: a) A basic 7 b) A basic 16 c) A basic 2.

c) A basic 2.

173. The Boolean expression is A0B=S, what is the name of relative gate? a) Inverter. b) Exclusive or gate. c) AND gate.

c) AND gate.

157. The specification for transfer of digital data between avionics components, Exist in: a) ARINC 561. b) ARINC 573. c) ARINC 429.

c) ARINC 429.

159. What is the MIL-STD-1553B: a) A military standard, which adapted as a NATO standard. It is a multiple source data transmission system b) The transmission can take place from more than one source. c) All above answer are correct.c

c) All above answer are correct.c

152. The Aircraft control surface is driven by: a) Digital signal. b) Discrete Signal. c) Analog signal.

c) Analog signal.

134. The Hardware type of computer are: a-) Analog computer. b) Digital computer . c) Analog- Digital- Hybrid computer.

c) Analog- Digital- Hybrid computer.

165. What is the name of gate, which provide "1" output, while all inputs are "1"? a) OR gate. b) NOR gate. c) And gate.

c) And gate.

232. The electromagnetic compatibility(EMC) stated that. a- The equipment must not exceed specified emission level for a wide range of radio frequencies. Or Must not be susceptible to external source of high level of radio frequency energy over very wide frequency band. b- The equipment must be able to withstand the very high electromagnetic pulse arising from lightning strikes. c- All above answers are stated in EMC.

c- All above answers are stated in EMC.

194. The memory capacity is generally specified in term of:. a- K bites. b- M bites. 0r G bite c- All of the above answers are correct.

c- All of the above answers are correct.

197. Computer classified by hardware, as: a- Analog computer. Ana Digital computer b- Hybrid computer. c- Analog ,digital, hybrid computer

c- Analog ,digital, hybrid computer

229. The unit or system, can be damaged by: a- EMI. b- Electromagnetic Interference. c- Answer "A" and "B" are the same

c- Answer "A" and "B" are the same

207. What are the basic modes of fiber optics? a- Single mode fiber. b- Multimode fiber. c- Answer "A" and "B" both correct

c- Answer "A" and "B" both correct

227. The aircraft systems, which uses software are: a- Flying controls, engine control, Electrical generation and distribution. b- Brakes, Radio and Navigational equipment. c- Answer A and B plus Flight instruments and AFCS components.

c- Answer A and B plus Flight instruments and AFCS components.

185. The fiber optic data bus, is specified by: a- Arinc 429 . b- Arinc 636. c- Arinc 629..

c- Arinc 629.

225. The electrostatic voltage is generated by the : a- Sliding action between materials. or separating action between material b- Rubbing action between materials. c- By action on all above answer the electrostatic voltages will be generated.

c- By action on all above answer the electrostatic voltages will be generated.

220. The electrostatic discharge (EDS) ,caused by: a- Direct contact. b- Induced by an electrostatic field. c- Direct contact or induced by electrostatic field.

c- Direct contact or induced by electrostatic field.

230. For equipment protection, the unit must be effectively screened from: a- B.M.I. b- A.T.A. c- E.M.I.

c- E.M.I.

233. HIRF. Means: a- High internal radiated frequency. b- High injected ray frequency. c- High intensity radiated field.

c- High intensity radiated field.

202. The flight management computer, is an example of: a- Reference computer. b- Controlling computer. c- Interactive computer.

c- Interactive computer.

189. What is the software? a- Physical equipment of computer. b- Input information. c- It is the instructions that make the hardware function

c- It is the instructions that make the hardware function

200. In digital computer processing occurs in: a- Central processing units. b- Microprocessors. c- Microprocessors, or central processing units.

c- Microprocessors, or central processing units.

193. What are the format of data bits, which can be stored in memory? a- Parallel. b- Serial. c- Parallel or serial.

c- Parallel or serial.

210. The configuration, of LED s, which are used on aircraft displays are: a- Seven segment LED display. b- DOT matrix. c- Seven segment or Dot matrix.

c- Seven segment or Dot matrix.

231. The electromagnetic interference created from: a- Lightning strikes. Or failures in the electromagnetic screening system. b- Over flying high power radio/radar transmitter (E.M.C.) c- The EMI arise from all above answer.

c- The EMI arise from all above answer.

224. What colors are the conductive caps and covers? a- black or green. b- green or gray. c- black or gray.

c- black or gray.

213. The color CRT has: a-Single electron guns. b- double electron guns. c- three electron guns.

c- three electron guns.

223. What are the type of labels(decals), which are used to identify units as containing ESDS sensitive circuits? a-The military and commercial symbols are used on some units. and The international (JEDEC) symbol is used on most ESDS decals. b-ESDS printed circuit boards (cards) that are LRU,s are identified by decals labeled" Static Sensitive". c-All above answers are the three basic types of labels(decals).

c-All above answers are the three basic types of labels(decals).

219. The transfer of electrostatic charge between bodies at different electrostatic potentials is known as: a-Energy at rest. b-Semiconductor devices. c-Electrostatic Discharge (EDS).

c-Electrostatic Discharge (EDS).

201. What is the name of computer, which use, both analog and digital elements in one computer: a-Analog computer. b-Digital computer. c-Hybrid computer.

c-Hybrid computer.

198. Computers used on aircraft, are classified, according to task, as: a- Reference, Information computers. Controlling computer b- Storage / Monitoring computers. And Interactive computer d- All above answers are used on aircraft

Module 5 (B2) Digital Techniques / Electronic Instrument Systems

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