NAA - NCATT AET Rev 14 w/o Figs
109) If the secondary winding of a transformer is partially shorted, what will the voltage be? A) Lower than normal voltage B) Higher than normal voltage C) No change in voltage
A) Lower than normal voltage *The transformer will get hot. Current will increase in the secondary.*
110) If the current in the diodes of an AC rectifier is reversed, what will happen to the output waveform? A) Polarity is reversed B) Polarity remains the same C) The circuit will fail
A) Polarity is reversed
70) Why is stainless steel safety wire used with steel bolts? A) Prevent dissimilar metal corrosion B) Prevent fretting corrosion C) Prevent Intergranular corrosion D) None of the above
A) Prevent dissimilar metal corrosion (also known as galvanic corrosion)
62) What maintenance practice is best for Foreign Object Damage (FOD) prevention? A) Tool management B) FOD walk / sweep C) Clean as you go D) All of these
A) Tool management
119) The gold color band is never used as the first number on a resistor? A) True B) False
A) True
140) A transistor that acts as an open or is in cut-off means Vce=Vcc. A) True B) False
A) True
133) Is it ok to use the single strand safety wire method for electrical connections? A) Yes B) No C) It depends
A) Yes
71) Can you use .032" safety wire in a .045" hole? A) Yes B) No
A) Yes
73) What happens to wire resistance if the length is increased? A) increases B) decreases C) stays the same
A) increases
107) What happens if you connect the diodes backwards in a full wave bridge rectifier? A) polarity will be reversed B) Polarity remains the same C) The circuit will stop working
A) polarity will be reversed
136) What is a typical EVR circuit?
Adjustable Electronic Voltage Regulator
125) When do the two rectifier diodes in a Full-Wave Rectifier let current through?
As the diodes become forward biased; one lets through the positive alternation, and the other lets through the negative alternation.
141) Where is the outer shield of a coaxial cable grounded?
At the source or Input edge (powered end)
106) If the fourth band on a resistor is silver, what is the tolerance? A) 5% B) 10% C) 20%
B) 10%
59) Aircraft wire is normally rated at what voltage? A) 28Vdc B) 115Vac C) 26Vac
B) 115Vac
105) If lamp A and lamp B are connected in parallel to a 30V source, what is the voltage across lamp A and B? A) 15V on both B) 30V on both C) 60V on both
B) 30V on both
143) What flight control allows the aircraft to roll? A) Rudder B) Aileron C) Elevator D) Flaps
B) Aileron
81) An aircraft in flight; is the pressure on the wing greatest on the top or the bottom? A) Top B) Bottom
B) Bottom
57) What parts of a relay comprise the Primary (Control) Circuit? A) Armature, Contacts, Spring B) Core & Coil C) Moveable plunger, Coil, armature
B) Core & Coil
116) If the volts across a capacitor is decreased, the stored voltage will? A) Increase B) Decrease C) Remain the same
B) Decrease
120) If the forward bias is increased in an NPN transistor the resistance will? A) Increase B) Decrease C) Remain the same
B) Decrease
114) Wire has a gauge starting at 1 and goes to 40. Does the cross-section increase or decrease with a larger American Wire Gauge (AWG) number? A) Increase B) Decrease
B) Decrease *As wire gauge numbers increase, cross section decreases and vice-versa*
80) How do you clean corrosion from aluminum? A) Steel Wool B) Emery cloth, aluminum wool C) Brass wire brush
B) Emery cloth, aluminum wool
117) Is effective voltage in an AC circuit greater or less than the maximum instantaneous voltage. A) Greater than B) Less than
B) Less than
104) What principle do transformers operate on? A) Mutual capacitance B) Mutual inductance C) Inductive reactance
B) Mutual inductance
86) Which type of tester supplies its own power? A) Wattmeter B) Ohmmeter C) Ammeter D) Voltmeter
B) Ohmmeter
132) Which is the safest way to use a wrench, by pushing or pulling? A) Pushing B) Pulling
B) Pulling
122) If you notice a person has a hearing injury, what should you do first? A) Speak louder B) Remove them from the noisy area. C) Give them earplugs
B) Remove them from the noisy area.
77) What must be done to a torque wrench when finished? A) Return it to the tool room B) Reset to the minimum setting C) Leave it set on the last readin
B) Reset to the minimum setting
137) What is the most common type of fuselage design? A) Monocoque B) Semi-monocoque C) Truss
B) Semi-monocoque
54) What distinguishes a solenoid from a basic relay? A) A coil to create a magnetic field. B) The plunger (armature) pulled into the coil. C) Has multiple Normally Open (NO) or Normally Closed (NC) contacts.
B) The plunger (armature) pulled into the coil.
56) How many paths of current are required for a holding relay coil? A) One B) Two C) Three D) Four
B) Two
96) If you add a parallel leg (resistor) in a circuit what changes will happen? A) Voltage decreases, resistance increases, current remains the same. B) Voltage remains the same, resistance decreases, current increases. C) Voltage remains the same, resistance increases, current increases. D) Voltage remains the same, resistance increases, current decreases.
B) Voltage remains the same, resistance decreases, current increases.
113) If your output voltage is 0V when troubleshooting a circuit, what would you check input voltage with? A) Ohmmeter B) Voltmeter C) Ammeter D) VSWR meter
B) Voltmeter
74) What happens to wire resistance if the cross-section (area) increases? A) increases B) decreases C) stays the same
B) decreases
75) What does it mean if there is no 4th band on a resistor? A) +/- 5% tolerance B) +/- 10% tolerance C) +/- 20% tolerance
C) +/- 20% tolerance
84) How many watts is considered an RF danger? A) 100W B) 500W C) 1000 watts
C) 1000 watts
128) How many time constants does it take for a capacitor to be approximately 100% fully charged? A) 1 B) 2 C) 5 D) 10
C) 5
49) With a transistor amplifier operating in class B, the collector current will flow for what percentage/how many degrees of the input signal? A) 10% B) 20% C) 50% D) 70.7%
C) 50%
103) What ohmic value of impedance are aviation transmission lines (antennas, coax)? A) 75Ω B) 100Ω C) 50Ω D) 200Ω
C) 50Ω *Known as "surge impedance"*
129) What percent of the applied voltage will the capacitor be at after one time constant? A) 13.5% B) 36.8% C) 63.2% D) 86.5%
C) 63.2%
91) What do the transistors in a 555 timer do? A) Amplify B) Oscillate C) Act as switches
C) Act as switches
94) In a ¼ λ (wavelength) antenna, if a capacitor is added in series (to tune the antenna), what would happen to frequency? A) Increase B) Decrease C) No change
A) Increase
48) The monostable multivibrator output PRF is determined by the: A) Input trigger frequency B) width of the input trigger C) Cutoff time of Q1 and Q2 D) discharge time of C1 and C2
A) Input trigger frequency
111) What is the "hand-rule" for magnetic induction in generators? A) Left hand rule B) Right hand rule C) Open hand rule
A) Left hand rule
85) When using a Digital Multimeter (DMM) or Ohmmeter to test a forward biased BJT emitter to base junction, what will the resistance be? A) Low B) High C) Low momentarily, then high
A) Low
69) When installing equipment in aircraft, what references do you use? A) Approved flight manual B) STCs (Supplemental Type Certificates) C) Aircraft service or maintenance manual. D) All of these
D) All of these
130) Current of 50 milliamps can cause what? A) Asphyxiation/Suffocation B) Heart failure C) Death D) All of these
D) All of these *30 mA is sufficient to cause suffocation. at 100 mA the heart stops beating. At 300 mA breathing stops. Death can occur at any point if first aid is delayed.*
90) What must you do before giving first aid to an electrical shock victim? A) Check for a pulse B) Disconnect the power from the circuit C) Remove victim from the live circuit D) B & C
D) B & C
123) What is the term for the outside shape or curvature of the wing? A) Angle of Attack B) Chord Line C) Radius D) Camber
D) Camber
68) Who is responsible for providing an (M)SDS with chemicals? A) Employer B) OSHA C) Employee D) Chemical manufacturer
D) Chemical manufacturer
47) The astable multivibrator is a: A) Sweep generator B) Divide by two circuit C) Time base generator D) Free running oscillator
D) Free running oscillator
88) How do capacitors behave with frequency changes? A) It is unpredictable. B) It is not frequency dependent. C) Infinite ohms for high frequency, zero ohms for low frequency. D) Infinite ohms (open) for low frequency, zero ohms (shorted) for high frequency.
D) Infinite ohms (open) for low frequency, zero ohms (shorted) for high frequency.
124) What converts AC to DC? A) Filters B) Oscillators C) Amplifiers D) Rectifiers
D) Rectifiers
112) What is the combination of a horizontal stabilizer and an elevator called? A) Empennage B) Rudder C) Winglet D) Stabilator
D) Stabilator
83) What do flip-flops do (when used in Static RAM)? A) Act as a FDD B) Act as a switch C) Refresh the charge on the capacitor D) Store bits of data (1 bit per flip-flop)
D) Store bits of data (1 bit per flip-flop)
50) What type of amplifier coupling is used for impedance matching and circuit isolation? A) LC B) RC C) Direct D) Transformer
D) Transformer
52) The amplifiers class of operation is determined by? A) Fidelity B) efficiency C) output waveform D) amount of forward bias
D) amount of forward bias
51) The interchange of energy between the inductor and capacitor in a tank circuit is called? A) Damping B) degeneration C) Loading effect D) the flywheel effect
D) the flywheel effect
95) What is the acronym "FIRE" as it pertains to EVRs?
F = Forward Bias, I = Current, R = Resistance, E = Voltage Drop
126) How do you prevent Electrostatic Discharge (ESD)?
Grounding hand tools, work bench, and body (wrist straps) are to be at the same potential.
131) What damage can be caused to the human body by radar waves?
Heat damage to internal organs without any external indications.
87) What would a Digital Multimeter read when testing a capacitor?
High resistance (depending on the charge). *Newer DMMs, such as the Fluke 87V, have a capacitor test mode that will read the value in Farads. You can also use an LCR (inductor/capacitor/resistor) meter.*
93) What happens to current in a Zener diode with an increase in voltage?
Shunts current to ground/current flow to ground increases
98) A hazardous material container must be labeled with a waterproof label containing what information?
Substance name, trade name, manufacturer, hazards, and date.
97) What is the difference between an NPN and a PNP transistor schematic symbol?
The direction of the emitter's arrow.
144) What is hysteresis?
The magnetic field (flux reversals) lagging the change of polarity of the input voltage. Loss comes primarily in the form of heat.
101) What is Kirchhoff's voltage law?
The sum of the voltage drop across the resistors must equal the voltage applied.
142) In scientific notation, what is a coefficient of a number?
A number multiplied by itself a specified number of times as indicated by the exponent that equals a resultant number.
135) What rate of humidity is conducive to the creation of ESD conditions? A) 0-20% B) 20-50% C) 50-80% D) 80-100%
A) 0-20%
53) What is the resistance of normally closed contacts when the relay is de-energized? A) 0Ω / short B) Infinite Ω C) 50Ω
A) 0Ω / short
45) If the positive alteration of a square wave is 100 µsec in duration, then the PRF is: A) 5 kHz B) 10 kHz C) 50 kHz D) 100 kHz
A) 5 kHz
82) How many ohms is the aircraft radio impedance (a.k.a. Surge Impedance)? A) 50Ω B) 75Ω C) 100Ω D) 200Ω
A) 50Ω
79) What does a filter in an electrical circuit consist of? A) A capacitor and an inductor B) A diode and a resistor C) A capacitor and a diode D) A transistor and a resistor
A) A capacitor and an inductor
58) What parts of a relay comprise the Secondary (Controlled) Circuit? A) Armature, Contacts, Spring B) Core & Coil C) Moveable plunger, Coil, armature
A) Armature, Contacts, Spring
60) Transformers are considered to be what kind of filter? A) Band pass B) Band Stop C) High Pass D) Low Pass
A) Band pass
89) What wing structure has internal bracing (spars)? A) Cantilever B) Monocoque C) Semi-Monocoque
A) Cantilever
118) If the capacitor value in a filter (power supply rectifier) is increased, the AC ripple effect will: A) Decrease B) Increase C) Remain the same.
A) Decrease *T=RC*
67) What does the phrase "cradle to grave" refer to? A) Hazardous waste management programs. B) Waste Disposal programs.
A) Hazardous waste management programs.
102) Is Hysteresis loss greater at higher or lower frequency? A) Higher B) Lower
A) Higher *Hysteresis is caused by magnetic flux lines not changing polarity as quickly as the change in voltage polarity. The flux change lags voltage change.*
76) What is the leading cause of accidents? A) Human Error B) Mechanical failures
A) Human Error (NCATT tends to focus on fatigue and stress as the leading causes)
139) ESD is negligible provided what condition exists? A) Relative humidity is kept below 40% B) Static wicks are installed on all equipment. C) All electrical/electronic structures are properly bonded. D) Different potential levels are maintained between electrical/electronic structures.
C) All electrical/electronic structures are properly bonded
72) What should be removed at preflight? A) Red streamers, covers, plugs B) Anything that states "Remove Before Flight" C) Both A & B
C) Both A & B
115) What is the international symbol for current? A) Capital letter "E" or "V" B) Greek letter Omega (Ω) C) Capital letter "I"
C) Capital letter "I" *Stands for "intensity"*
61) What is the flow of electrons through a conductor called? A) Voltage B) Static Electricity C) Current D) Resistance
C) Current
121) If the forward bias is decreased in an NPN transistor the conduction will? A) Increase B) Remain the same C) Decrease
C) Decrease
134) When the J-K flip-flop input is triggered in toggle mode, what is the output frequency? A) The same as the input B) Twice the input C) Half of the input.
C) Half of the input. *Flip-flops are bi-stable multivibrators. Output PRF = 1/2 input PRF. Output PRT = 2x input PRT*
145) What is the most commonly used flip-flop? A) R-S B) D C) J-K D) T
C) J-K
108) When reading the resistance of a discharged capacitor it reads a constant 40 ohms. What is the problem? A) The capacitor is good B) Polarity is reversed C) Leaky capacitor
C) Leaky capacitor
78) How do you move elevators? A) Move the control wheel left or right B) Move the foot pedals C) Move the yoke forward or backward D) Press the button for the desired floor
C) Move the yoke forward or backward
46) What type of output waveform is produced by an astable multivibrator? A) Sine wave B) Saw tooth C) Square wave or rectangular D) Rectangular wave
C) Square wave or rectangular
55) What part of a basic relay returns the armature to its de-energized position? A) The coil B) The core C) The spring D) The contacts
C) The spring
66) Which type of diagram will tell the size of an electrical wire? A) Schematic diagram B) Block diagram C) Wiring diagram
C) Wiring diagram
138) What is 250,000 written in scientific notation? A) 250 x 10^3 B) 25 x 10^4 C) 0.25 x 10^6 D) 2.5 x 10^5
D) 2.5 x 10^5
127) What are some causes of ESD? A) Dry conditions (0-20% humidity rate) B) poor bonding. C) Damp conditions (>50% humidity) D) A & B
D) A & B
63) Most accidents are caused by what? A) Unsafe acts of individuals C) Improper equipment installation. B) Using improper parts D) All of the above
D) All of the above
64) When should a person stop administering mouth to mouth resuscitation/CPR? A) When the person administering CPR becomes physically tired B) When person becomes conscious C) When medical help arrives D) All of the above
D) All of the above
99) What do flaps provide?
Increased lift, drag, and wing area for take-off and landing at lower speeds.
92) In an electronic voltage regulator (EVR) if voltage increases what would be the outcome?
Load current increases (through the load and transistor instantly, and momentarily until QR adjusts).
100) What do trim tabs do?
Work with flight controls to reduce the workload on the pilot. *Balance the forces across control surfaces.*
