NCATT AET Unofficial Exam Questions and Answers (Most Recent Version, Complete Study Material).

NCATT AET Unofficial Exam Questions
and Answers (Most Recent Version,
Complete Study Material)
33) The "negative temperature coefficient" of a thermistor
means that as temperature increases, resistance will do
what?
A) increase B) decrease C) Remain the same - Correct
Answers ✅B) decrease


34) Using the swamping resistor for thermal stability, what
type of feedback is developed to control the amplifier?
A) Regenerative B) Degenerative
C) Positive feedback - Correct Answers ✅B) Degenerative


35) Which of the following devices is used to dissipate heat
into the air?
A) Heat sink B) Circuit board
C) Swamping resistor D) Coupling Capacitor - Correct
Answers ✅A) Heat sink


36) What type of amplifier coupling is used that can amplify
DC voltages as well as AC signals?
A) LC B) RC
C) Direct D) Transformer - Correct Answers ✅C) Direct


37) In a common collector amplifier, degenerative feedback is
how many degrees out of phase with the input signal?

,NCATT AET Unofficial Exam Questions
and Answers (Most Recent Version,
Complete Study Material)
A) 0 degrees B) 90 degrees
C) 180 degrees D) 270 degrees - Correct Answers ✅C) 180
degrees


38) The common base amplifier has a voltage gain ________
than one, but a current gain _______ than one.
A) Less than one, less than one B) Greater than one, less than
one
C) Less than one, greater than one D) Greater than one,
greater than one - Correct Answers ✅38) B (*C is correct
for a "Common Collector", D is correct for a "Common
Emitter")


39) What type of waveform is produced by a sinusoidal
oscillator?
A) Saw tooth B) Sine wave
C) Square wave D) Rectangular - Correct Answers ✅B) Sine
wave


40) The basic requirements for sustaining oscillations in an
oscillator are a power supply, FDD, amplifier, and __________.
A) regenerative feedback B) degenerative feedback
C) negative feedback D) Constructive feedback - Correct
Answers ✅A) regenerative feedback

,NCATT AET Unofficial Exam Questions
and Answers (Most Recent Version,
Complete Study Material)
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 ✅45) A *PRT
includes negative alternation = 200 µsec tota


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

, NCATT AET Unofficial Exam Questions
and Answers (Most Recent Version,
Complete Study Material)
49) With a transistor amplifier operating in class B, the
collector current will flow for what percentage/how many
degrees of the input signal? [Alternate: "the amplifier's
collector current is cutoff for:"] A) 10% B) 20% C) 50% D)
70.7%
(or)
A) 90o B) 360o C) 180o D) More than 180o but less than 360o
- Correct Answers ✅C) 180o


51) The interchange of energy between the inductor and
capacitor in a tank circuit is called what?
A) Damping B) degeneration
C) Loading effect D) the flywheel effect - Correct Answers
✅D) the flywheel effect


52) The amplifier's class of operation is determined by what?
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