Computer Fundamentals
Use the expression for x = D + [(A+B)C]' · E to determine the output of the circuit for the conditions A = B = E = 1, C = D = 0. A. 0 B. 1 C. 2 D. 10
A. 0
What digits are used in the binary number system? A. 0 and 1 B. high and low C. true and false D. all of the choices
A. 0 and 1
With OR operation, 1 + 1 = _____ A. 1 B. 0 C. 10 D. 2
A. 1
What is the largest number that can be represented using 8 bits? A. 11111111 B. 10111011 C. 10111111 D. 11011111
A. 11111111
The number of nybbles which make up one byte A. 2 B. 4 C. 8 D. 16
A. 2
If F = xy + x'y' Boolean expression is to be implemented using decoders and OR gates, the connection involves A. 2 to 4 line decoder with 3 OR gates B. 3 to 8 line decoder with 2 OR gates C. 2 to 4 line decoder with 1 OR gate D. 3 to 8 line decoder with 4 OR gates
A. 2 to 4 line decoder with 3 OR gates
An acceptable voltage range of a logic 1 for TTL. A. 2 to 5 V B. 0 to 0.8 V C. 0 to 1.5 V D. 3.5 to 5 V
A. 2 to 5 V
A representation of numbers when negative numbers are obtained by complementing their positive equivalent and adding 1. A. 2's complement B. Inversion C. Signed numbers D. Indeterminate
A. 2's complement
Octal coding involves grouping the bits in A. 3's B. 110 C. 101 D. 1100
A. 3's
What is the hex equivalent of an ASCII code which means "HELP"? A. 48 45 4C 50 B. 4C 50 51 52 C. 58 57 58 48 D. 48 45 50 50
A. 48 45 4C 50
The number of comparator circuits required to build a three-bit simultaneous A/D converter is A. 7 B. 8 C. 15 D. 16
A. 7
In the 7400 Family of TTL Devices, Quad 2-input NAND gates has a device number equivalent to A. 7400 B. 7402 C. 7432 D. 7486
A. 7400
How many bits are in a byte? A. 8 B. 4 C. 2 D. 16
A. 8
Determine the sum-of-product expression for a circuit with four inputs and an output that is HIGH only when A is low at the same time that exactly two inputs are low. A. A'B'C'D + A'B'CD' + A'BC'D' B. A'B'C' + C'D' C. A'B'C' + A'C'D' + A'B'D' D. 10
A. A'B'C'D + A'B'CD' + A'BC'D'
A lamp is controlled from two positions A and B (e.g. stir case circuit). The Boolean expression for the above circuit is A. AB'+A'B B. AB + AB' C. AB + (AB)' D. AB' + (AB)'
A. AB'+A'B
Which logic gate is similar to the function of two series switches? A. AND gate B. OR gate C. AND D. all of the above
A. AND gate
The most widely used 7-bit alphanumeric code is the A. ASCII B. EBCDIC C. Straight binary code D. Gray code
A. ASCII
A square wave oscillator or clock generator A. Astable circuit B. Monostable circuit C. Bistable circuit D. Debounding circuit
A. Astable circuit
Why are voltage DAC's generally slower than current DAC's? A. Because of the response time of the op-amp current-to-voltage converter B. Because of its internal construction C. Because voltage DAC's have many heat losses D. None of the choices
A. Because of the response time of the op-amp current-to-voltage converter
What is the fundamental unit of storage in digital computers? A. Bit B. Byte C. Code D. Baud
A. Bit
Which of the following does not form DACs? A. Counter B. Resistor network C. Current switches D. Reference
A. Counter
What is the most common type of digital IC package? A. DIP B. Metal type C. CMOS D. TTL
A. DIP
A type of computer bus which is bidirectional. A. Data bus B. Address C. Control bus D. Calling bus
A. Data bus
A situation when a circuit's output level for a given set of input conditions can be assigned as either a 1 or a 0. A. Don't care B. Totem Pole C. Low level D. High level
A. Don't care
A single bit comparator is usually implemented using A. Exclusive OR B. NOR gate C. Exclusive NOR D. Wired-AND
A. Exclusive OR
Class of programmable logic devices wherein both its AND and its OR arrays are programmable. A. Field Programmable Logic Array B. Programmable Logic Controller C. Programmable Logic Circuit D. Programmable Array Logic
A. Field Programmable Logic Array
The maximum deviation of DAC output from its ideal value, expressed as percentage of full scale. A. Full scale error B. Deviation ratio C. Percentage error D. None of the choices
A. Full scale error
A momentary, narrow, spurious and sharply defined change in volume. A. Glitch B. Strobe C. Toggle D. Clock
A. Glitch
What happens when the input to a digital IC is left unconnected for TTL ICs? A. It acts like logic 1 B. It becomes overheated C. It acts just like logic 0 D. It eventually destroys itself.
A. It acts like logic 1
Meaning of checksum in ROM's A. It is a code placed in the last one or two ROM locations that represents the sum of the expected ROM data from all other locations. B. Used as a means to test for leakage in one or more ROM locations C. prevents decoding glitches D. regulates ROM
A. It is a code placed in the last one or two ROM locations that represents the sum of the expected ROM data from all other locations.
What graphical device is used to convert a truth table to its corresponding logic circuit in a simple and orderly process? A. Karnaugh map B. State table C. Truth table D. State diagram
A. Karnaugh map
An instruction that causes data to be brought from memory into an accumulator register. A. LOAD B. LOOP C. FETCH D. JUMP
A. LOAD
How many logic gates are in an SSI chip? A. Less than 12 gates B. Between 12 to 99 gates C. Anywhere from 100 to 9999 gates D. 10,000 or more
A. Less than 12 gates
What is the normal resting state of the SET and CLEAR inputs in a flip-flop A. Low, high B. High, low C. High, high D. Low, low
A. Low, high
A circuit that produces an output pulse for a fixed period of time in response to a trigger and then returns to its quiescent state. A. Monostable circuit B. Astable circuit C. Bistable circuit D. Discriminator
A. Monostable circuit
It is said to be a universal gate because any digital system can be implemented with it. A. NAND B. AND C. OR D. Exclusive OR
A. NAND
Any logic gate can be built using A. NOR gate B. OR gate C. AND gates D. all of these
A. NOR gate
A NAND circuit with positive logic will operate as A. NOR with negative logic B. AND with negative logic C. OR with negative logic input D. AND with negative logic output
A. NOR with negative logic
The heart of analog computer A. OPAMP B. I/O C. CPU D. combination of these
A. OPAMP
A two-input OR gate is designed for positive logic. However, it is operated with negative logic. The resulting logic operation will then be A. OR B. NOR C. AND D. Ex-OR
A. OR
If a certain circuit acts as AND gate when used with positive logic (H = 1, L = 0), what function will it perform when used with negative logic (H = 0, L = 1). A. OR B. AND C. NAND D. NOR
A. OR
This occurs when the result of an arithmetic operation is a larger number than the output register can accommodate. A. Overflow B. Inflow C. Underflow D. Lock-ahead carry
A. Overflow
Class of programmable logic devices wherein its AND array is programmable while its OR array is hard-wired. A. PAL B. PLA C. PLD D. PROM
A. PAL
Linkage between the CPU and the users is provided by: A. Peripheral devices B. Control unit C. Storage D. Software
A. Peripheral devices
What will be the state of Q and Q' after a flip-flop has been reset? A. Q = 0, Q' = 1 B. Q = 1, Q' = 0 C. Q = 0, Q' = 0 D. Q = 1, Q' = 1
A. Q = 0, Q' = 1
When a flip-flop is set, what are the states of Q and Q'? A. Q = 1, Q' = 0 B. Q = 0, Q' = 1 C. Q = 0, Q' = 0 D. Q = 1, Q' = 1
A. Q = 1, Q' = 0
An RS flip-flop will not change in state when A. R = 0, S = 0 B. R = 1, S = 0 C. R = 0, S = 1 D. R =1, S = 1
A. R = 0, S = 0
Which of the following is a non-volatile device? A. ROM B. RAM C. PLA D. PLD
A. ROM
Which of the following is an example of non-volatile memory? A. ROM B. RAM C. LSI D. VLSI
A. ROM
With a _____, a processor can store data at ay address and read back the stored information at any time. A. RWM B. ROM C. PLA D. PROM
A. RWM
Duty cycle for repetitive waveform is defined as the A. Ratio of the ON time to the total time B. Sum of the ON time and the OFF time C. Ratio of the OFF time to the ON time D. Ratio of the total time to the ON time
A. Ratio of the ON time to the total time
A term synonymous with CLEAR in computer systems. A. Reset B. Set C. Toggle D. Load
A. Reset
The state of a flip-flop when Q = 0 and Q' = 1 A. Reset B. Set C. Trigger state D. Tristate
A. Reset
A shift register in which the output of the last flip-flop is connected to the input of the first flip-flop. A. Ring counter B. Ripple counter C. Parallel counter D. BCD counter
A. Ring counter
What is the normal resting state of the SET and CLEAR inputs in a NAND gate latch? A. SET = CLEAR = 1 B. SET = 0, CLEAR = 1 C. SET = 1, CLEAR = 0 D. SET = CLEAR = 0
A. SET = CLEAR = 1
A command to an ADC to start conversion A. SOC B. EOC C. PAC D. EAR
A. SOC
The time it takes for the DAC output to settle to within ½ step size of its full scale value when the digital input changes from zero to full scale. A. Settling time B. Set-up time C. Hold time D. Full scale time
A. Settling time
Which of the items below can perform parallel-to-serial data conversion? A. Shift register B. Binary counter C. Multiplexer D. Decoder
A. Shift register
It consists of the instructions and data that the computer hardware manipulates to perform useful work. A. Software B. Program C. File D. Data
A. Software
An input signal that can activate or disable a gate. A. Strobe B. Glitch C. Tristate D. Wired-AND
A. Strobe
An input that disables multiplexers or demultiplexers when it is HIGH. A. Strobe B. Keyboard C. Decoder D. Binary input
A. Strobe
What is the function of the comparator in the ADC? A. Tells control logic when the DAC output exceeds the analog input B. Compares two parameters only C. Addition and multiplication D. Arithmetic operation
A. Tells control logic when the DAC output exceeds the analog input
Which of the following involves digital quantities? A. Ten position switch B. Current meter C. Temperature D. Radio volume control
A. Ten position switch
What are the three basic parts of a BCD adder circuit? A. Two 4-bit adders and connection logic B. Two connection logic and one 4-bit adder C. Two full adders and one AND gate D. One connection logic and 4 full adders
A. Two 4-bit adders and connection logic
An IC that transforms parallel data to serial in the asynchronous format and vice versa. A. UART B. USART C. MODEM D. RS232C
A. UART
How does a CMOS integrated circuit respond to a floating input? A. Unpredictable, may overheat and be destroyed B. Open C. Shorted D. Acts just like a logic 1
A. Unpredictable, may overheat and be destroyed
An address is the number used by the CPU to specify A. a location in the memory B. a location in flags C. a location in accumulator D. a location in stack pointer
A. a location in the memory
Instruction mnemonic means A. a short abbreviation for the operation B. a binary code that represents the operation to be performed by the CPU C. technical term sometimes added to an IC's description D. representation of a quantity that varies in discrete steps
A. a short abbreviation for the operation
The system program used to translate directly an assembly language to machine language is called A. assembler B. compiler C. text editor D. debugger
A. assembler
A type of multivibrator circuit which generates a square wave of its own is the A. astable B. monostable C. bistable D. flip-flop
A. astable
A JK flip-flop can be made to function like a T flip-flop by simply A. connecting the J and K inputs together as one input B. connecting J = 0 and K = 0 C. resetting all inputs of the JK D. connecting earth ground the JK inputs
A. connecting the J and K inputs together as one input
A T flip-flop can be derived by A. connecting the two inputs of the JK flip-flop together B. by inverting the inputs of a JK flip-flop C. connecting the RS flip-flop's input to ground D. securing an integrated circuit with three inputs
A. connecting the two inputs of the JK flip-flop together
ACK indicates reception of A. correct data B. incorrect data C. insufficient data D. sufficient data
A. correct data
A decade counter A. counts to 9 and resets on the next pulse B. counts for ten days C. counts ten times faster than a binary counter D. reverts on the pulse after the tenth
A. counts to 9 and resets on the next pulse
Another name for a digital multiplexer is A. data selector B. compressor C. encoder D. decoder
A. data selector
Race conditions can be avoided by introducing ________ between the flip-flops A. delay B. dusting C. harmonic suppressor D. deaccelerators
A. delay
The flip-flop can change only when the appropriate clock transition occurs. It is a condition called A. edge triggered B. latching C. clocking D. pulsing
A. edge triggered
The physical part or electronic circuitry of a computer system is called A. hardware B. memory C. microprocessor D. peripheral device
A. hardware
How does the operation of asynchronous input differ from that of a synchronous input? A. it works independently of the clock input B. it is very dependent on the clock transition C. it is mutually the same in function D. Not determined by ordinary operation
A. it works independently of the clock input
When a binary adder is used as BCD adder, the sum is correct when it is A. less than 9 B. less than 16 C. greater than 9 D. none of the above
A. less than 9
__________ is non-linear system A. logarithmic amplifiers B. current to voltage converter C. voltage to current converter D. none of the above
A. logarithmic amplifiers
The fan out capability of a digital building block depends on the current capability of its output and the current requirement of each input driven by that output, and maybe defined as the A. number of inputs that one output can transmit to B. number of other inputs that can transmit to one input C. maximum power dissipation that the unit can stand D. amount of cooling required
A. number of inputs that one output can transmit to
A simple flip-flop is a _______ bit storage cell A. one B. three C. two D. four
A. one
A monostable multivibrator has A. one stable state B. two stable states C. no stable state D. tristate
A. one stable state
A parity check usually can detect A. one-bit error B. double-bit error C. three-bit error D. any-bit error
A. one-bit error
The state of the flip-flop before the occurrence of a clock pulse is called as its A. present state B. next state C. current input D. present output
A. present state
The two basic types of record-access methods are: A. sequential and random B. sequential and indexed C. direct and immediate D. on-line and realtime
A. sequential and random
In a register the flip-flops are connected in A. series B. series parallel C. parallel D. any of the above
A. series
What two types of inputs that a clocked flip-flop has? A. synchronous control inputs and clock input B. Asynchronous control inputs and clock input C. Pulsed control inputs and clock input D. all of the choices
A. synchronous control inputs and clock input
The processor or central processing unit is A. the heart of the computer B. employed RISC C. communicates with the user D. supports floating point numbers
A. the heart of the computer
Data storage in a memory is termed as A. writing B. memorizing C. loading D. reading
A. writing
An equivalent Boolean equation for an exclusive NOR is A. xy + x'y' B. xy + xy' C. x'y + xy' D. xy'+ x'y'
A. xy + x'y'
An acceptable voltage range of a logic 0 for TTL. A. 2 to 5 V B. 0 to 0.8 V C. 0 to 1.5 V D. 3.5 to 5 V
B. 0 to 0.8 V
The correction to be applied in decimal adder to incorrect sum is A. 00101 B. 00110 C. 01101 D. 01010
B. 00110
What is the binary ASCII code for a question mark? A. 0111110 B. 0111111 C. 0111000 D. 0100011
B. 0111111
Given: x = A'BC (A+D)'. Determine the output of the circuit x if A = 0, B = 1, C = 1 and D = 0. A. 0 B. 1 C. 2 D. 10
B. 1
Perform binary subtraction to 6 ¼ and 4 ½ would result to A. 1001. 01 B. 1.11 C. 10. 11 D. 1.00
B. 1.11
The decimal system is composed of _____ numerals or symbols. A. 2 B. 10 C. 8 D. 16
B. 10
In grand scale integration GSI a chip contains more than A. 1500 gates B. 1000 gates C. 5000 gates D. 10000 gates
B. 1000 gates
Address bits needed to access a 64 K memory are A. 1 B. 16 C. 8 D. 32
B. 16
How many inputs does a half adder have? A. 1 B. 2 C. 3 D. 4
B. 2
How many outputs does a full adder have? A. 1 B. 2 C. 4 D. 8
B. 2
A result which is obtained when one is added to the least significant bit position of a binary number in the 1's complement. A. Spike B. 2's complement form C. Complement D. Signed binary numbers
B. 2's complement form
The number of full-adders in a 4-bit parallel adder will be? A. 2 B. 3 C. 4 D. 5
B. 3
There are _____ flip-flops for a 3-bit binary counter. A. 2 B. 3 C. 4 D. 5
B. 3
Low speed modems generally handle data rates between A. 3000 and 9000 bps B. 300 and 2400 bps C. 2400 and 9600 bps D. 100 and 2400 bps
B. 300 and 2400 bps
BCD code has always _____ bits per number. A. 2 B. 4 C. 8 D. 16
B. 4
In designing a 16 x 1 multiplexer, how many selection lines are needed? A. 2 B. 4 C. 16 D. 32
B. 4
The number of flip-flops required to build a mod - 19 counter is A. 4 B. 5 C. 6 D. 7
B. 5
The minimum number of flip-flops required in a counter to count 60 pulses is A. 4 B. 6 C. 8 D. 10
B. 6
Quad 2-input XOR gates in the 7400 Family of TTL devices has a device number equivalent to A. 7402 B. 7486 C. 7408 D. 7404
B. 7486
The sum of weights in a self-complementing BCD code is A. 8 B. 9 C. 10 D. 16
B. 9
Two binary signals a, b, are to be compared. The output expression when the two signals are equal is given by A. AB' + AB' B. AB + (AB)' C. A'B' D. AB
B. AB + (AB)'
All arithmetic operations take place in the _____ of a computer A. CPU B. ALU C. Microprocessor D. ROM
B. ALU
The basic universal gate in integrated circuit electronics is _________ gate A. OR B. AND C. NAND D. NOR
B. AND
What type of gate is equivalent to a NAND gate followed by an inverter? A. OR B. AND C. XOR D. NOR
B. AND
This type of bus carries the memory address from the computer to the memory. A. Data bus B. Address bus C. Control bus D. Parallel bus
B. Address bus
A digital circuit that oscillates between two unstable output states. A. Monostable multivibrator B. Astable multivibrator C. Bistable multivibrator D. Flip-flop
B. Astable multivibrator
A sequential logic circuit where the storage elements commonly used are time-delay devices (usually gates). A. Synchronous SLC B. Asynchronous SLC C. Counter D. Register
B. Asynchronous SLC
A binary counter that counts from 0000 to 1001 before it recycles. A. Buffer B. BCD counter C. Ring counter D. Ripple counter
B. BCD counter
A digital circuit that takes a 4-bit BCD input and activates the required outputs to display the equivalent decimal digit on a 7-segment display. A. BCD-to-decimal decoder B. BCD-to-7-segment driver C. Decimal to BCD driver D. 7-segment display
B. BCD-to-7-segment driver
How many logic gates are in an MSI chip? A. Less than 12 gates B. Between 12 to 99 gates C. Anywhere from 100 to 9999 gates D. 10,000 or more
B. Between 12 to 99 gates
Application of excessive current to a fuse in order to open it. A. Shorting B. Blowing C. Breaking D. Disconnecting
B. Blowing
Small circles on the input or output lines of logic circuit symbols which represent inversion of a particular signal. A. Bootstrap B. Bubble C. Strobe D. Clode
B. Bubble
A temporary storage area, attached to the CPU, for I/O operation is a: A. Channel B. Buffer C. Register D. Core
B. Buffer
What device puts data on the data bus during a write operation? A. ALU B. CPU C. Keyboard D. Accumulator
B. CPU
A circuit made up of combinations of logic gates, with no feedback from output to input. A. Sequential logic circuit B. Combinational logic circuit C. Clocked circuits D. Asynchronous circuit
B. Combinational logic circuit
CMOS means A. Complementary Main-Oxide Semiconductor B. Complementary Metal-Oxide Semiconductor C. Complements Main-Oxidation Semiconductor D. Correlation in Metal Oxidized Semiconductor
B. Complementary Metal-Oxide Semiconductor
A flip-flop which follows its input in the next state. A. T B. D C. JK D. RS
B. D
The one-input RS flip-flop is the _____ flip-flop. A. T B. D C. R D. Latch
B. D
Asynchronous flip-flop input used to clear Q immediately to 0. A. DC set B. DC clear C. DC reset D. DC toggle
B. DC clear
A logic circuit that depends on the status of its selected inputs will channel its data input to one of several data outputs. A. MUX B. DMUX C. RAM D. ROM
B. DMUX
Correcting the faults in a circuit or a system. A. Buzz-out B. Debugging C. Trap D. Fault corrector
B. Debugging
A counter that counts from a maximum count downward to zero A. Synchronous counter B. Down counter C. Up counter D. Up/down counter
B. Down counter
Current - mode logic (CML) is the same as A. TTL B. ECL C. CMOS D. LSL
B. ECL
Which of the following logics exhibit relatively highest power dissipation per gate? A. TTL B. ECL C. CMOS D. LSI
B. ECL
A digital circuit that produces an output code depending on which of its inputs is activated. A. Decoder B. Encoder C. Multiplexer D. Demultiplexer
B. Encoder
In Boolean algebra, G + GF = A. GF B. G C. F D. 1
B. G
A system of coordinating I/O between the transmitting and receiving devices. A. Charging B. Handshaking C. Interfacing D. Polling
B. Handshaking
A situation in a system where it can never leave or progress to another state. A. Rest B. Hang-up state C. No change in state D. Toggle
B. Hang-up state
It is the required interval immediately following the active edge held of clocks during which the control inputs must be held. A. Set up time B. Hold time C. Pulsing time D. Propagation time
B. Hold time
Which of the following is the language used in making an internet web page? A. Highertext mark-up language B. Hypertext mark-up language C. Hightech mark-up language D. Hypertext make-up language
B. Hypertext mark-up language
What JK input condition will always set Q upon the occurrence of the active clock transition? A. J = 0, K = 0 B. J = 1, K = 0 C. J = 0, K = 1 D. J = 1, K = 1
B. J = 1, K = 0
A device with slowest switching speed is A. LED B. LCD C. Nixie tubes D. none of these
B. LCD
__________ display consumes least amount of power A. LED B. LCD C. Fluorescent display D. All displays consumes same power
B. LCD
A computer programming language in which groups of 1s and 0s are used to represent instructions. It is also the only language a computer actually understood. A. Application software B. Machine language C. High - level language D. Programming language
B. Machine language
A register which holds the address of the word currently being accessed. A. Hold register B. Memory address register C. Memory data register D. Access register
B. Memory address register
A register which holds the data being written into or read out of the addressed memory location. A. Hold register B. Memory data register C. Memory address register D. Glitch register
B. Memory data register
In modern computer, bipolar semi-conductor chips are often used in the arithmetic-logic unit. What material is used for the slower and less expensive primary storage section? A. Gallium arsenide B. Metal-oxide semi-conductor (MOS) C. silicon D. Germanium
B. Metal-oxide semi-conductor (MOS)
An abbreviation that represents the op code of a computer instruction. A. ASCII B. Mnemonic C. Octets D. Instruction
B. Mnemonic
A + B = Y is the Boolean expression for A. OR gate B. NOR gate C. AND gate D. NAND gate
B. NOR gate
For LCD display which of the following liquid crystals is used? A. Aqua regia B. Nemanic fluid C. Liquid boron D. Mercury
B. Nemanic fluid
Which gate corresponds to the action of parallel switches? A. AND gate B. OR gate C. NAND gate D. NOR gate
B. OR gate
The output of an inverter is connected to the input of a second inverter. Determine the output level of the second inverter. A. Output level is the complement of the input level B. Output level is the same as the input level C. High output is observed D. Undetermined state
B. Output level is the same as the input level
A computer language that enables Programmable Array Logic (PAL) users to generate a file that can be used to blow a PAL. A. JEDEC B. PALASM C. TURBO C++ D. Visual C
B. PALASM
A circuit that goes through 2n-1 states in a random fashion. A. Random generator B. Pseudo-random sequence generator C. Counting shift D. Register
B. Pseudo-random sequence generator
What will be the states of Q and Q' after a flip-flop has been cleared? A. Q = 1, Q' = 0 B. Q = 0, Q' = 1 C. Q = 0, Q' = 0 D. Q = 1. Q' = 1
B. Q = 0, Q' = 1
The number of digits used by a number system. A. Base B. Radix C. 2n D. n
B. Radix
A single word memory location used to temporarily hold data during program execution. A. Accumulator B. Register C. Buffer D. Stack
B. Register
An instruction that causes data in the accumulator to be moved to the memory or a peripheral register. A. FETCH B. STORE C. LOOP D. LOAD
B. STORE
This type of fault has the same effect as an internal short between IC pins. A. Open signal lines B. Shorted signal lines C. Broken wire D. Poor solder connections
B. Shorted signal lines
A technique often used to eliminate decoding spikes. A. Wired-AND B. Strobing C. Tristate D. Wired-NAND
B. Strobing
What is meant by interfacing in a computer system? A. Synchronization of data information operation in a computer B. Synchronization of digital information transmission between computer and external I/O devices C. Connection of computers D. Finding the fault in a network
B. Synchronization of digital information transmission between computer and external I/O devices
A one-input JK flip-flop is the _____ flip-flop. A. D B. T C. S-R D. C
B. T
What is an operand address? A. The binary code that represents the operation to be performed by the CPU B. The address of the data to be operated as the CPU executes the instruction called for by the opcode C. A short abbreviation for the operation D. All of the choices
B. The address of the data to be operated as the CPU executes the instruction called for by the opcode
Which of the following is NOT an advantage of state tables in sequential logic circuit design? A. They are the systematic approach to a design problem B. The number of variables is limited C. They minimize the gating required D. They result in synchronous circuit
B. The number of variables is limited
The storage time of a transistor is part of the A. Turn - on time B. Turn - off time C. fall time D. rise time
B. Turn - off time
A small change made in resistance or capacitance to time a circuit precisely. A. Trigger B. Tweaking C. Bounce D. Squeaking
B. Tweaking
A term used to describe the logic function created when open-collector outputs are tied together. A. Wired-OR B. Wired-AND C. Totem-pole D. Tristate
B. Wired-AND
A translated program in machine language is called A. a source program B. an object program C. machine program D. users program
B. an object program
When power is first applied to any flip-flop circuit, it is impossible to predict the initial state of Q and Q'. What could be done to ensure that NAND latch always started off in the Q = 1 state? A. apply a momentary HIGH to PRESET input B. apply a momentary LOW to SET input C. apply a momentary LOW to CLEAR input D. apply a momentary HIGH to CLEAR input
B. apply a momentary LOW to SET input
The microprocessor chip register unit ALU chip has A. arithmetic functions only B. basic control and arithmetic functions C. instructions to execute data D. memory functions
B. basic control and arithmetic functions
Which of the following circuits exhibits memory? A. astable multivibrator B. bistable multivibrator C. NAND gate D. Ex. OR gate
B. bistable multivibrator
Speeds of modems are generally classified by the number of _____ they can transmit. A. cycles per second B. bits per second C. frequency per second D. all of the choices
B. bits per second
A multiwire connection between digital circuits is usually called a A. ribbon B. bus C. wire wrap D. multiplexed line
B. bus
An included input terminals in a magnitude comparator IC which is significant when both inputs compared are equal is called as its A. setting B. cascading inputs C. input terminals D. address
B. cascading inputs
An AND gate is a A. sequential circuit B. combinational circuit C. memory circuit D. relaxation circuit
B. combinational circuit
An actuator in the DAC A. performs conversion of digital data to its analog representation B. controls a physical variable according to an electrical input signal C. converts a non-electrical physical quantity to an electrical quantity D. performs calculation
B. controls a physical variable according to an electrical input signal
The clear data and present input of the JK flip-flop are known as A. synchronous inputs B. either a or c C. direct inputs D. indirect inputs
B. either a or c
Processors with more than two registers for arithmetic and logical operations are classified as A. specific registered processors B. general register processors C. accumulator based D. serial register processor
B. general register processors
In medium-scale integration MSI, a chip contains A. less than 12 gates B. less than 100 gates C. less than 1000 gates D. less than 5000 gates
B. less than 100 gates
In small scale integration (SSI), chip contains A. less than 5 gates B. less than 12 gates C. less than 100 gates D. less than 500 gates
B. less than 12 gates
A digital circuit is also referred to as a/an _____ circuit. A. arithmetic B. logic C. electrical D. sequential
B. logic
The most primitive instructions that can be given to a computer are those interpreted directly by the hardware in __________ form. A. assembly language B. machine language C. high-level language D. simulator
B. machine language
Single parity check is not reliable in case of A. paper tape B. magnetic tape C. magnetic drum D. cores
B. magnetic tape
A device in which computer information and data are stored and relieved at a later time is called: A. hardware B. memory C. microprocessor D. peripheral device
B. memory
A half byte is known as A. bug B. nibble C. data D. bit
B. nibble
A magnitude comparator has 22n entries in the truth table where n = A. number of inputs B. number of comparator bits C. number of outputs D. number of inputs and outputs
B. number of comparator bits
Address usually is A. alpha-batical B. numerical C. alpha-numerical D. any of these
B. numerical
In INHIBIT operation A. output is 1 when both inputs are 0 B. output are 0 when blocking input is 1 C. output is 0 when blocking input is 0 D. output is 1 when blocking input is either 0 or 1
B. output are 0 when blocking input is 1
The fastest method for transferring data from one register to another is the A. serial transfer B. parallel transfer C. hybrid transfer D. FIFO
B. parallel transfer
The speed - power product of a digital IC is the product of A. speed and propagation delay B. propagation delay and gate dissipation C. speed and noise margin D. speed and gate dissipation
B. propagation delay and gate dissipation
Programs written to cause computers to function in a desired way are called A. facts B. software C. codes D. instructions
B. software
An DRO memory can be converted into NDRO memory by employing A. decade counters B. storage registers C. address registers D. inhibit lines
B. storage registers
A logic circuit that is triggered by a clock signal is A. sequential B. synchronous C. synchronous D. pulsed
B. synchronous
In Schottky - clamped TTL, the purpose of Schottky diode is A. to increase propagation delay B. to achieve efficient non-saturated switching C. to improve noise margin D. to increase dissipation
B. to achieve efficient non-saturated switching
A bistable multivibrator has A. one stable state B. two stable states C. no stable state D. tristate
B. two stable states
Text editors and formatters belong to the area of computing known as _____. A. software B. word processing C. compilers D. assemblers
B. word processing
Which of the following is a form of De Morgan's theorem? A. A + B = (AB)' B. AB = (A + B)' C. (A + B)' = A' · B' D. A·B = A' · B'
C. (A + B)' = A' · B'
Identify incorrect relation if any A. AxB = (AB)'+(BA)' B. A+A'B = A+B C. (A+B)(A+C)=A(A+B) D. A+AB = A
C. (A+B)(A+C)=A(A+B)
In Boolean algebra, B · B' = A. B B. B' C. 0 D. 1
C. 0
An acceptable voltage range of a logic 0 for CMOS operating at VDD = 5 V. A. 2 to 5 V B. 0 to 0.8 V C. 0 to 1.5 V D. 3.5 to 5 V
C. 0 to 1.5 V
What is the output of an EX - OR gate when a logic signal and its exact inverse are connected to its input? A. X' B. X C. 1 D. 0
C. 1
Typical propagation delay range for modern digital integrated circuits is A. 1 to 100 milliseconds B. 1 to 100 microseconds C. 1 to 100 nanoseconds D. 1 to 100 picoseconds
C. 1 to 100 nanoseconds
Equivalent of decimal value of 178 in straight binary code is _____ and in BCD is _____. A. 11000, 11111111 B. 10111101, 100000 C. 10110010, 101111000 D. 111111, 1100000
C. 10110010, 101111000
What binary number follows 1110? A. 1010 B. 0111 C. 1111 D. 1000
C. 1111
A 4-bit counter with four flip-flops will count up to decimal A. 8 B. 31 C. 15 D. 63
C. 15
A decoder with four inputs can have a maximum of how many outputs? A. 4 B. 8 C. 16 D. 32
C. 16
The number of matrix planes required to store a 20-bit word in a memory array is A. 2 B. 10 C. 20 D. 40
C. 20
The number of input combinations will equal _____ for an N-input truth table. A. 2N-1 B. N C. 2N D. N-1
C. 2N
A multiplexer is described by its size through _____, where n = number of bits. A. n x 2n B. 1 x 2n C. 2n x 1 D. 2n x m
C. 2n x 1
From a 3-bit binary counter design using T flip-flops, determine the number of T flip-flops needed in its circuit implementation. A. 1 B. 2 C. 3 D. 4
C. 3
How many 7490 ICs are to be cascaded to count up to 999? A. 1 B. 2 C. 3 D. 4
C. 3
The CMOS ICs can be operated at powerful supply of value A. 5 V B. 5.2 V C. 3-18 V D. 3-9 V
C. 3-18 V
For a decode counter, number of binaries required is A. 2 B. 3 C. 4 D. 8
C. 4
What is the largest decimal value that can be represented using 12 bits? A. 144 B. 2048 C. 4095 D. 4096
C. 4095
How many flip-flops should be used to realize 32-count capacity? A. 2 B. 4 C. 5 D. 6
C. 5
The ECL can be used to switch frequencies as high as A. 1 MHz B. 100 MHz C. 500 MHz D. 1 GHz
C. 500 MHz
Sixty capsules are to be filled in bottles automatically employing an electronic counter. The number of flip-flop in such a counter will be A. 4 B. 5 C. 6 D. 7
C. 6
A six-bit alpha-numeric code is able to code A. 36 characters B. 48 characters C. 64 characters D. 128 characters
C. 64 characters
Which of the following ICs can be used for frequency division by 5? A. 7466 B. 7492 C. 7490 D. NOTA
C. 7490
The Boolean expression for a six-input OR gate A. A + B + C B. A · B · C · D · E · F C. A + B + C + D + E + F D. U + V + W + X + Y + Z
C. A + B + C + D + E + F
It represents machine instructions by mnemonic names and allows memory addresses and other constants to be represented by symbols rather than bit strings. A. Assembler B. Machine language C. Assembly language D. Interpreter
C. Assembly language
Another name for a decade counter A. frequency divider B. ripple shift counter C. BCD counter D. Binary counter
C. BCD counter
An electrical connection common to all segments of an LCD. A. Dual slope B. Bootstrap C. Backplane D. Cascade
C. Backplane
If each digit of a decimal number is represented by its binary equivalent, the result is a code called A. Morse code B. Binary system C. Binary-coded decimal D. Straight binary coding
C. Binary-coded decimal
A circuit with no memory characteristic and whose output depends only on the current value of its inputs. A. SLC B. Boolean circuits C. CLC D. Multiplexers
C. CLC
Which of the following logics has excellent noise margin? A. TTL B. ECL C. CMOS D. all of these
C. CMOS
_________ is regarded as the father of computers A. Pascal B. John Napier C. Charles Babbage D. Abacus
C. Charles Babbage
Arrival of a clock signal at the clock inputs of different flip-flops at different times as a result of propagation delays. A. Clock transition B. Buffer address C. Clock skew D. None of the choices
C. Clock skew
Circuits made up of combinations of logic gates, with no feedback from outputs to inputs. A. Latch B. Sequential logic circuit C. Combinational logic circuit D. Memory
C. Combinational logic circuit
It is needed to translate a high-level program into a sequence of machine instructions that performs the desired task. A. Assembler B. Interpreter C. Compiler D. Debugger
C. Compiler
A programmable block of logic within a gate array, that contains a flip-flop for storage and also allows the user to specify logic functions on its inputs. A. Programmed block B. PLD C. Configurable logic block D. Block diagram
C. Configurable logic block
This bus carries lines that control the operation of the memory from the microprocessor to the memory. A. Data bus B. Address bus C. Control bus D. Bus lines
C. Control bus
The most commonly used IC package for digital integrated circuits is the A. CMOS pack B. DIP ceramic C. DIP plastic D. Flat pack
C. DIP plastic
The parity bit is added for _______ purposes A. Coding B. Indexing C. Error- detection D. Controlling
C. Error- detection
The portion of an instruction cycle where the instruction is sent from memory to the instruction register A. LOAD B. ACCUMULATE C. FETCH D. EXECUTE
C. FETCH
The technique of placing software or programs in a ROM semi conductor chip is called: A. PROM B. EPROM C. Firmware D. Micro-processor
C. Firmware
The code used to reduce the error due to ambiguity in reading of a binary optical encoder is A. Octal code B. Excess - 3 code C. Gray code D. BCD code
C. Gray code
Which of the following choices is NOT a characteristic of analog quantity? A. Variable amplitude B. One quantity is represented by another which is proportional to the first C. Is considered discrete D. They can vary over a continuous range of values
C. Is considered discrete
A JK flip-flop will operate in the toggle mode when A. J = 0, K = 0 B. J = 1, K = 0 C. J = 1, K = 1 D. J = 0, K = 1
C. J = 1, K = 1
An instruction that alters the normal course of a program by causing it to jump to another instruction. A. Rotate instruction B. Skip instruction C. Jump D. ACC
C. Jump
An outstanding advantage of LCDs from LEDs. A. LCDs are organized as a 7-segment display for numerical read out B. LCDs can be multiplexed C. LCDs essentially act as a capacitor and consume almost no power D. LCDs generates light
C. LCDs essentially act as a capacitor and consume almost no power
Which of the following items below is NOT one of the three basic operations of Boolean algebra? A. Logical addition B. Logical complementation C. Logical subtraction D. Logical multiplication
C. Logical subtraction
The unit of the speed of a digital IC is A. Hz B. KHz C. MHz D. GHz
C. MHz
Dynamic memory cells are constructed using A. transistors B. flip-flop C. MOSFET D. FET
C. MOSFET
Which of the following holds data and processing instructions temporarily until the CPU needs it? A. ROM B. Control unit C. Main memory D. Coprocessor chips
C. Main memory
A property whereby the output of a digital-to-analog converter either increases or stays the same as the input is increased. A. Volatility B. Immunity C. Monotonicity D. Parity
C. Monotonicity
Consider two normally open contacts in series for a normally closed relay. The logic operation performed by this circuit is A. AND B. NAND C. NOR D. none of these
C. NOR
The _____ operation result will be 1 if any one or more variables is a 1. A. NOT B. AND C. OR D. NOR
C. OR
Class of mass memory devices that use a laser beam to write and read onto a specified coated disk. A. Mass storage B. RAM C. Optical disk memory D. Non-volatile memory
C. Optical disk memory
An IC that contains a large number of interconnected logic functions wherein the user can program the IC for a specific function by selectively breaking the appropriate interconnections. A. RAM B. ROM C. PLD D. PLC
C. PLD
________ is the sequence of instructions that tell the computer how to process the data. A. Address B. Flow chart C. Program D. Control Unit
C. Program
A preproduction model of a system built for testing and debugging, A. Wire list B. Maybe (colloquial) C. Prototype D. Sample
C. Prototype
The state of a flip-flop when Q = 1 and Q' = 0. A. Reset B. Latch C. Set D. Glitch
C. Set
It is the required interval immediately following the active edge of the clock signal during which the control inputs must be held stable. A. Hold time B. Pulsing time C. Set up time D. All the time
C. Set up time
A table used by a PLD language such as PALASM, to calculate the expected outputs for a set of inputs. A. Excitation table B. State table C. Simulation table D. Truth table
C. Simulation table
How many different ways can we implement the inversion operation in a logic circuit? A. One B. Two C. Three D. Four
C. Three
A state causing the flip-flop to change or reverse its state. A. Reset B. Set C. Toggle D. Non-toggle
C. Toggle
Refer to the debugging method in which the program is executed one instruction at a time and the register contents can be examined after each step A. Text editing B. Syntax analyzing C. Trace D. Semantic tracing
C. Trace
An analog memory output circuit used to eliminate aperture error is called a A. MUX B. DMUX C. Track/store amplifier D. Flip-flop
C. Track/store amplifier
It converts a non-electrical physical quantity to an electrical quantity. A. Converter B. Inverter C. Transducer D. Compiler
C. Transducer
A counter that counts sequentially but does not step through all possible states, it returns to zero after a particular state. A. Ripple counter B. Decade counter C. Truncated counter D. Binary counter
C. Truncated counter
This occurs when the result of an arithmetic operation is a more negative number than the output register can accommodate. A. Error B. Overflow C. Underflow D. Don't care
C. Underflow
BCD expresses each decimal digit as A. A byte B. a string of 8 bits C. a string of 4 bits D. a string of 2 bits
C. a string of 4 bits
The disadvantage of magnetic drum storage is that A. its size is very large B. only read out it possible C. access time is high D. access time is less
C. access time is high
Loader in a computer is A. hardware B. software C. auxiliary D. none of these
C. auxiliary
High speed modems transmit between A. 300 and 2400 bps. B. 2400 and 9600 bps C. between 2400 and 9600 bps D. between 300 and 2400 bps
C. between 2400 and 9600 bps
Which of the following MOSFETs is employed in the CMOS? A. p-channel enhancement type B. n-channel enhancement type C. both n-channel and p-channel type D. p-channel depletion type
C. both n-channel and p-channel type
"Limbo" state of a flip-flop occurs when A. both outputs are low B. both outputs are high C. both output are the same D. the outputs are inverse
C. both output are the same
A computer consists mainly of electronic A. parts B. devices C. chips D. circuits
C. chips
Which of the following are the two main components of the CPU? A. control unit and registers B. registers and main memory C. control unit and ALU D. ALU and bus
C. control unit and ALU
A D flip-flop is _______ flip-flop A. digital B. dial type C. delayed D. differential
C. delayed
What is the major advantage of serial transfer over parallel transfer? A. large interconnections between gates B. one at a time transmission C. fewer interconnections between registers D. speed
C. fewer interconnections between registers
The most important memory element which is made of an assembly of logic gates is called A. latch B. bistable multivibrator C. flip-flop D.all of the choices
C. flip-flop
Low speed modems method of modulation is usually A. phase-shift modulation B. dibit modulation C. frequency shift keying D. amplitude modulation
C. frequency shift keying
Which of the following is the minimum error code? A. octal code B. binary code C. gray code D. excess-3 code
C. gray code
A source program is a program written in A. alphanumeric characters B. machine language C. high level language D. symbolic language
C. high level language
Which of the following storages has greatest capacity with less cost per bit? A. Coincidence - current memory B. magnetic tape C. magnetic drum D. semi-conductor memory
C. magnetic drum
The ALU of a central processing unit does the essential math work for the computer. What does the control unit do? A. communicate its results B. activates the output device C. monitors the flow of information D. control the printer
C. monitors the flow of information
LSI usually contains A. 10 gates B. 10 to 100 gates C. more than 100 gates D. more than 10 000 gates
C. more than 100 gates
An n-bit binary parallel adder requires _____ in its least design. A. n half adders B. n half subtractor C. n full adders D. n half subtractor and n full adder
C. n full adders
The state of the flip-flop after the occurrence of a clock pulse is called as its A. current state B. present state C. next state D. current input
C. next state
An astable multivibrator has A. one stable state B. two stable states C. no stable state D. tristate
C. no stable state
In the data sheet of a digital building block, operating speed is typically expressed in terms of A. capacitance C B. transition frequency C. propagation delay times for both possible output transitions D. miles per hour or centimeters per second
C. propagation delay times for both possible output transitions
As compared to fixed-point machine, a floating point machine has A. a floating of 2 position for the binary point B. no provision for powers of 2 C. provision of powers D. no provision for the binary point
C. provision of powers
Data retrieval from a memory is called A. getting B. accessing C. reading D. fetching
C. reading
A group of electronic, magnetic or mechanical devices that store data is called A. program B. address C. register D. software
C. register
Storage time in transistors occur when it is operating in A. active region B. cut-off region C. saturation region D. either active or saturation region
C. saturation region
In clock circuits, SWG means A. square wave glitches B. standard wire gauge C. square wave generators D. standard wave ground
C. square wave generators
A transistor is operated as a non-saturated switch to eliminate A. turn-on time B. turn-off time C. storage time D. delay time
C. storage time
Noise margin, which is one indication of how likely it is that information communicated between digital building blocks will be incorrect due to noise, depends on A. output current capabilities and input current requirements B. output power and required input power for the two logic states C. the "safety margin" between the output voltage produced by the transmitting block and input voltage required by the receiving block for each of the two logic state. D. the "safety margin" between the noise level and the noise figure.
C. the "safety margin" between the output voltage produced by the transmitting block and input voltage required by the receiving block for each of the two logic state.
In microprocessor architecture, flag indicates A. the number of the microprocessor B. the name of the manufacturer C. the internal status of the CPU D. the bit - size of the microprocessor
C. the internal status of the CPU
The function of strobe pulse in digital system is A. to reset memory registers B. to check the functioning of logic gate C. to avoid race problem D. to shift data in registers
C. to avoid race problem
The function of CPU is _________ A. to provide external storage of text B. to communicate with the operator C. to read, interpret and process the information and instruction D. to provide a hard copy
C. to read, interpret and process the information and instruction
Why do so many micro-computers today have hard disks? A. can be moved easily from one computer to another B. inexpensive C. very high storage capacity D. they are a sequential access storage device
C. very high storage capacity
Add (74)8 with (1.1)2 A. (700)10 B. (70.5)8 C. (10101.01).2 D. (75.4)8
D. (75.4)8
NAND operation is A. (X+Y)' B. X' + Y' C. X'*Y' D. (X'+Y')(X+Y)
D. (X'+Y')(X+Y)
In Boolean algebra, X + 1 = A. X + 1 B. X C. 0 D. 1
D. 1
The ratio of speeds of vertical memory to main memory is A. 10 B. 8 C. 1 D. 1/10
D. 1/10
How many logic gates are in a VLSI chip? A. Less than 12 gates B. Between 12 to 99 gates C. Anywhere from 100 to 9999 gates D. 10,000 or more
D. 10,000 or more
Number of cards read per minute by a card reader may be of the order of A. 1 B. 20 C. 200 D. 10000
D. 10000
Number of characters read per minute by a high speed paper tape recorder of a computer system is of the order of A. 10 B. 50 C. 300 D. 10000
D. 10000
Which of the following 4-bit combination(s) is/are invalid in the BCD code? A. 0010 B. 1000 C. 0101 D. 1010
D. 1010
In order to build a mode - 6 counter using three flip-flops, the number of possible counter sequence is A. 4 B. 8 C. 16 D. 28
D. 28
How many inputs does a full adder have? A. 2 B. 4 C. 8 D. 3
D. 3
An acceptable voltage range of a logic 1 for CMOS operating at VDD = 5 V. A. 2 to 5 V B. 0 to 0.8 V C. 0 to 1.5 V D. 3.5 to 5 V
D. 3.5 to 5 V
How many bits are required to represent an eight digit decimal number in BCD? A. 256 B. 4 C. 255 D. 32
D. 32
Which of the following codes is a weighted code? A. excess-3code B. shift-counter code C. gray code D. 5111 code
D. 5111 code
How many AND gates and 4-bit binary adders are needed to implement a 2-bit to 3-bit binary multiplier? A. 15 AND gates and three 4-bit binary adders B. 2 AND gates and one 4-bit binary adder C. 9 AND gates only D. 6 AND gates and one 4-bit binary adder
D. 6 AND gates and one 4-bit binary adder
Average latency time of magnetic tape memory is A. 2 sec B. 32 sec C. 8 sec D. 60 sec
D. 60 sec
A 6 bit alpha numeric is able to code _______ characters A. 12 B. 48 C. 48 D. 64
D. 64
How many flip-flops are required for a counter that will count 0 to 255? A. 2 B. 4 C. 16 D. 8
D. 8
Simplify the expression y = AB'D + AB'D'. A. AB B. D' C. BCD D. AB'
D. AB'
A circuit that operates in such a way that its output is high when all its inputs are high. A. OR B. NAND C. NOR D. AND
D. AND
What is the principal register of an arithmetic logic unit? A. Controller B. Buffer C. Actuator D. Accumulator
D. Accumulator
What is the only input combination that will produce a high at the output of a five-input AND gate? A. At least one low input B. At least one high input C. All inputs should be low D. All inputs should be high
D. All inputs should be high
What does a computer do with the data it receives from an ADC? A. Stores the data B. Performs calculation C. Processes the data D. All of the choices
D. All of the choices
Which of the following items below is not a part of the hardware organization in a computer? A. Architecture B. Implementation C. Hardware realization D. Assembler
D. Assembler
Which of the following parameters is not specified for digital ICs A. Gate dissipation B. Propagation delay C. Noise margin D. Band-width
D. Band-width
A program which can be executed on several different computers to compare their speed and performance. A. Compiler B. Assembler C. Diagnostic program D. Benchmark
D. Benchmark
A diagram consisting of a set of circles, where each circle contains a number of states within it. A. State table B. Transition diagram C. Karnaugh map D. Bubble diagram
D. Bubble diagram
Which of the following logics exhibit lowest power dissipation per gate? A. TTL B. 4 n-sec-ECL C. 8 n-sec-ECL D. CMOS
D. CMOS
Which of the following logics has the fan-out of more than 50? A. TTL B. 5 - nsec ECL C. 8 - nsec ECL D. CMOS
D. CMOS
The time difference which results when a clock may not arrive at all flip-flops at precisely the same time. A. Glitch B. Spike C. Hold D. Clock skew
D. Clock skew
In a computer system, it is a unit of hardware where the control keys are located. A. CPU B. Keyboard C. I/O section D. Console
D. Console
Which type of flip-flop is best suited for synchronous transfer because it requires the fewest interconnections from one flip-flop to the other? A. JK B. T C. RS D. D
D. D
A circuit designed to produce a clean output in response to a switch closure. A. Monostable circuit B. Filter circuit C. Attenuator D. Debouncing circuit
D. Debouncing circuit
What capital letter corresponds to 1000101 in the ASCII code? A. A B. C C. D D. E
D. E
Which of the following is the fastest unsaturated logic gate? A. RTL B. TTL C. HTL D. ECL
D. ECL
_________ logic is the fastest A. CMOS B. TTL C. LSI D. ECL
D. ECL
The _____ belongs to a class of codes called the minimum-change codes, in which only one bit in the code group changes when going from one step to the next. A. Morse code B. BCD code C. Excess-3 code D. Gray code
D. Gray code
In BCD, the code 1111 is A. letter F B. A C. 11 D. Invalid
D. Invalid
Which of the items below is not one of the three major sections of an MPU? A. Timing and control B. ALU C. Register D. Inversion
D. Inversion
Which of the following does not describe a flip-flop? A. It is a one-bit memory device. B. Its interval circuitry are usually symmetrical C. It is a bistable device D. It is equivalent to a one-shot circuit
D. It is equivalent to a one-shot circuit
A ring counter where the output is inverted and tied back to the input A. Shift counter B. Decade counter C. BCD counter D. Johnson counter
D. Johnson counter
Which of the following is not a dynamic test instrument? A. Logic probe B. Oscilloscope C. Logic analyzer D. Logic monitor
D. Logic monitor
Which of the following flip-flops do not have race problem? A. T flip-flop B. D flip-flop C. JK flip-flop D. Master - slave flip flop
D. Master - slave flip flop
What is the smallest type of computer in terms of their physical size? A. Minicomputer B. Mainframe C. Maxicomputer D. Microcomputer
D. Microcomputer
Which of the following circuits can be used as parallel - to - serial converter? A. Digital counter B. Decoder C. De - multiplexer D. Multiplexer
D. Multiplexer
Which of the following are the most widely used universal gates? A. NAND and OR gates B. OR and AND gates C. NOR and AND gates D. NOR and NAND gates
D. NOR and NAND gates
That part of a computer instruction that defines what type of operation the computer is to execute on specified data. A. Machine language B. Mnemonic C. Assembly language D. Op code
D. Op code
Which of the following system is digital? A. PPM B. PFM C. PWM D. PCM
D. PCM
The equipment attached to CPU which computer can access are called A. control units B. Hardware C. Computer components D. Peripherals
D. Peripherals
Which of the following is NOT an internal digital IC fault? A. Open signal lines B. Shorted signal lines C. Faulty power supply D. Poor solder connections
D. Poor solder connections
The CPU can perform read or write operations at any point in time in: A. ROM B. PROM C. EPROM D. RAM
D. RAM
Which of the following does not describe a flip-flop circuit? A. Latch B. Memory C. Bistable multivibrator D. ROM
D. ROM
__________ flip-flop is used as latch A. T B. JK C. D D. RS
D. RS
An area of memory that holds the ASCII characters that are being displayed on a monitor. A. Space B. Start bit C. Terminal D. Screen image
D. Screen image
A _____ takes the complete decimal number and represents it in binary. A. BCD B. Gray code C. Excess-3 code D. Straight binary code
D. Straight binary code
One of the standard levels of complexity of integrated circuits which contains 100,000 and more number of gates. A. SSI B. MSI C. VLSI D. ULSI
D. ULSI
A program counter is a storage register for A. location of data in memory B. location of instruction in memory C. binary code for the operation to be performed D. address of the next instruction to be executed
D. address of the next instruction to be executed
Which are the three major components of a central processing unit? A. Primary memory B. ALU C. Control unit D. all of the above
D. all of the above
The data manipulated by a program is called _____ depending on its nature and extent. A. data base B. file C. input D. all of the choices
D. all of the choices
Which of the following is a unit of measurement used with computer systems? A. Byte B. Megabyte C. Gigabyte D. all of these
D. all of these
The flip-flop circuit is A. unstable B. monostable C. multistable D. bistable
D. bistable
What are the two main sections of a CPU chips? A. primary memory B. arithmetic - logic section C. control section D. both B and C
D. both B and C
In digital counter the number of flip-flops is A. always odd B. always even C. always 2 D. equal to the number of bits required in the final binary count
D. equal to the number of bits required in the final binary count
An unconnected input is termed as _____. A. open B. close C. disconnected D. floating
D. floating
TTL, DTL and ECL which are frequently used to refer to certain "families" of digital integrated circuits, are actually names of A. alternatives to positive and negative logic B. varieties of positive and negative logic C. companies that originated the families D. general varieties of electronic circuits used as logic gates, from which, in essence, the building blocks in each series are constructed.
D. general varieties of electronic circuits used as logic gates, from which, in essence, the building blocks in each series are constructed.
Which of the following is the most characteristic of ROM? A. it is measured in megabytes B. it is volatile C. It performs mathematical calculations D. instructions are stored there permanently
D. instructions are stored there permanently
A digital circuit test equipment which is a troubleshooting tool that generates a short-duration pulse when activated manually, usually by pressing the button is the _____. A. logic probe B. VOM C. logic clip D. logic pulser
D. logic pulser
In negative logic the logic 1 state corresponds to A. earth level B. higher voltage level C. negative voltage D. lower voltage level
D. lower voltage level
In position logic, the logic 0 state corresponds to A. zero voltage B. higher voltage level C. any positive voltage D. lower voltage level
D. lower voltage level
A block added to the combinational logic circuit to form a sequential logic circuit is the A. ROM B. counter C. clock D. memory
D. memory
The central processing unit of a small computer system, including ALU and control functions on a single LSI chip is called A. hardware B. memory C. microprocessor D. peripheral device
D. peripheral device
The unit of speed-power product is A. pico-watts/sec B. pico-watts C. MHz D. pico-joules
D. pico-joules
An arbitrary code not related to the circuitry of a computer code, which must be first translated into a computer code, if it is to direct the computer, is known as A. puke code B. programmed code C. binary code D. pseude code
D. pseude code
A _____ condition that exists if a circuit output depends on which of two nearly simultaneous inputs arrive at a point in the circuit first. A. glitch B. skew C. clear D. race
D. race
Which of the following is used for manufacturing chips? A. control bus B. control unit C. parity unit D. semiconductors
D. semiconductors
When flip-flops are connected as to have output of one of the flip-flops as the input of the other then it is called A. storage register B. counter C. data register D. shift register
D. shift register
Change in state is A. same state B. reset C. set D. toggle
D. toggle
A NOR gate is on only when all its inputs are a. OFF b. positive c. ON d. high
a. OFF
For getting an output from an XNOR gate, its both inputs must be a. at the same logic level b. at the opposite logic level c. high d. low
a. at the same logic level
BCD code is a. binary code b. an alphanumeric code c. non-weighted d. the same thing as binary numbers
a. binary code
In binary number, shifting the binary point one place to the right a. multiples by 2 b. divides by 4 c. multiples 4 d. increases by 2
a. multiples by 2
In a digital signal the number of levels is a. two b. six c. four d. ten
a. two
The binary system uses powers of _____ for positional values a. two b. four c. six d. eight
a. two
The digital systems usually operate on a. hexadecimal system b. binary system c. octal system d. decimal system
b. binary system
Boolean algebra is essentially based on a. numbers b. logic c. truth d. symbols
b. logic
______ gate corresponds to the action of parallel switches a. NAND b. AND c. OR d. NOR
c. OR
Due to which of the following main reasons the digital computers use complemental subtraction? a. it avoids direct subtraction b. it is a very simple process c. it simplifies their circuitry d. it can handle negative numbers easily
c. it simplifies their circuitry
In Boolean algebra different variables used can have values of a. true or false b. on or off c. low or high d. 0 or 1
d. 0 or 1
The dual of the statement A+1=1 is a. A+A equals A b. A*A equals 1 c. A*1 equals A d. A*0 equals 0
d. A*0 equals 0
_______ gate is formed by inversion of the output of the AND gate. a. XNOR b. OR c. NOR d. NAND
d. NAND
________ logic function has the output low only when both inputs are high a. NOR b. AND c. OR d. NAND
d. NAND
Which of the following binary relations is invalid? a. 1+1 equals 10 b.1x1 equals 1 c.0x0 equals 0 d.0+1 equals 1
d.0+1 equals 1