NAA - NCATT AET Rev 14 Solved Exam
Questions and Answers (Complete
Practice Papers)
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 - Correct Answers ✅A) 5 kHz
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 -
Correct Answers ✅C) Square wave or rectangular
47) The astable multivibrator is a:
A) Sweep generator B) Divide by two circuit
C) Time base generator D) Free running oscillator - Correct
Answers ✅D) Free running oscillator
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 -
Correct Answers ✅A) Input trigger frequency
49) With a transistor amplifier operating in class B, the
collector current will flow for what percentage/how many
,NAA - NCATT AET Rev 14 Solved Exam
Questions and Answers (Complete
Practice Papers)
degrees of the input signal? A) 10% B) 20% C) 50% D) 70.7%
- Correct Answers ✅C) 50%
50) What type of amplifier coupling is used for impedance
matching and circuit isolation?
A) LC B) RC
C) Direct D) Transformer - Correct Answers ✅D)
Transformer
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 - Correct Answers
✅D) the flywheel effect
52) The amplifiers class of operation is determined by?
A) Fidelity B) efficiency
C) output waveform D) amount of forward bias - Correct
Answers ✅D) amount of forward bias
53) What is the resistance of normally closed contacts when
the relay is de-energized?
A) 0Ω / short B) Infinite Ω C) 50Ω - Correct Answers ✅A) 0Ω
/ short
,NAA - NCATT AET Rev 14 Solved Exam
Questions and Answers (Complete
Practice Papers)
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. - Correct Answers ✅B) The plunger (armature)
pulled into the coil.
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 -
Correct Answers ✅C) The spring
56) How many paths of current are required for a holding
relay coil?
A) One B) Two C) Three D) Four - Correct Answers ✅B) Two
57) What parts of a relay comprise the Primary (Control)
Circuit?
A) Armature, Contacts, Spring B) Core & Coil C) Moveable
plunger, Coil, armature - Correct Answers ✅B) Core & Coil
58) What parts of a relay comprise the Secondary
(Controlled) Circuit?
, NAA - NCATT AET Rev 14 Solved Exam
Questions and Answers (Complete
Practice Papers)
A) Armature, Contacts, Spring B) Core & Coil C) Moveable
plunger, Coil, armature - Correct Answers ✅A) Armature,
Contacts, Spring
59) Aircraft wire is normally rated at what voltage? A) 28Vdc
B) 115Vac C) 26Vac - Correct Answers ✅B) 115Vac
60) Transformers are considered to be what kind of filter?
A) Band pass B) Band Stop C) High Pass D) Low Pass -
Correct Answers ✅A) Band pass
61) What is the flow of electrons through a conductor called?
A) Voltage B) Static Electricity C) Current D) Resistance -
Correct Answers ✅C) Current
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 - Correct Answers ✅A)
Tool management
63) Most accidents are caused by what?
A) Unsafe acts of individuals C) Improper equipment
installation.
Questions and Answers (Complete
Practice Papers)
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 - Correct Answers ✅A) 5 kHz
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 -
Correct Answers ✅C) Square wave or rectangular
47) The astable multivibrator is a:
A) Sweep generator B) Divide by two circuit
C) Time base generator D) Free running oscillator - Correct
Answers ✅D) Free running oscillator
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 -
Correct Answers ✅A) Input trigger frequency
49) With a transistor amplifier operating in class B, the
collector current will flow for what percentage/how many
,NAA - NCATT AET Rev 14 Solved Exam
Questions and Answers (Complete
Practice Papers)
degrees of the input signal? A) 10% B) 20% C) 50% D) 70.7%
- Correct Answers ✅C) 50%
50) What type of amplifier coupling is used for impedance
matching and circuit isolation?
A) LC B) RC
C) Direct D) Transformer - Correct Answers ✅D)
Transformer
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 - Correct Answers
✅D) the flywheel effect
52) The amplifiers class of operation is determined by?
A) Fidelity B) efficiency
C) output waveform D) amount of forward bias - Correct
Answers ✅D) amount of forward bias
53) What is the resistance of normally closed contacts when
the relay is de-energized?
A) 0Ω / short B) Infinite Ω C) 50Ω - Correct Answers ✅A) 0Ω
/ short
,NAA - NCATT AET Rev 14 Solved Exam
Questions and Answers (Complete
Practice Papers)
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. - Correct Answers ✅B) The plunger (armature)
pulled into the coil.
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 -
Correct Answers ✅C) The spring
56) How many paths of current are required for a holding
relay coil?
A) One B) Two C) Three D) Four - Correct Answers ✅B) Two
57) What parts of a relay comprise the Primary (Control)
Circuit?
A) Armature, Contacts, Spring B) Core & Coil C) Moveable
plunger, Coil, armature - Correct Answers ✅B) Core & Coil
58) What parts of a relay comprise the Secondary
(Controlled) Circuit?
, NAA - NCATT AET Rev 14 Solved Exam
Questions and Answers (Complete
Practice Papers)
A) Armature, Contacts, Spring B) Core & Coil C) Moveable
plunger, Coil, armature - Correct Answers ✅A) Armature,
Contacts, Spring
59) Aircraft wire is normally rated at what voltage? A) 28Vdc
B) 115Vac C) 26Vac - Correct Answers ✅B) 115Vac
60) Transformers are considered to be what kind of filter?
A) Band pass B) Band Stop C) High Pass D) Low Pass -
Correct Answers ✅A) Band pass
61) What is the flow of electrons through a conductor called?
A) Voltage B) Static Electricity C) Current D) Resistance -
Correct Answers ✅C) Current
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 - Correct Answers ✅A)
Tool management
63) Most accidents are caused by what?
A) Unsafe acts of individuals C) Improper equipment
installation.
