NCATT AET Unofficial (Non-Figure Questions) WITH ANSWERS

NCATT AET Unofficial (Non-Figure
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Questions) WITH ANSWERS |\ |\




33) The "negative temperature coefficient" of a
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thermistor means that as temperature increases,
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resistance will do what? |\ |\ |\




A) increase B) decrease C) Remain the same - CORRECT
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ANSWERS ✔✔B) decrease |\ |\




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


35) Which of the following devices is used to dissipate
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heat into the air?
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A) Heat sink B) Circuit board
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C) Swamping resistor D) Coupling Capacitor - CORRECT
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ANSWERS ✔✔A) Heat sink |\ |\ |\




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


37) In a common collector amplifier, degenerative
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feedback is how many degrees out of phase with the |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



input signal? |\




A) 0 degrees B) 90 degrees
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C) 180 degrees D) 270 degrees - CORRECT ANSWERS
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✔✔C) 180 degrees |\ |\




38) The common base amplifier has a voltage gain
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________ than one, but a current gain _______ than one.
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A) Less than one, less than one B) Greater than one, less
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than one |\




C) Less than one, greater than one D) Greater than one,
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greater than one - CORRECT ANSWERS ✔✔38) B (*C is
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correct for a "Common Collector", D is correct for a
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"Common Emitter")
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39) What type of waveform is produced by a sinusoidal
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oscillator?
A) Saw tooth B) Sine wave
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C) Square wave D) Rectangular - CORRECT ANSWERS
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✔✔B) Sine wave |\ |\

,40) The basic requirements for sustaining oscillations in
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an oscillator are a power supply, FDD, amplifier, and
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__________.
A) regenerative feedback B) degenerative feedback
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C) negative feedback D) Constructive feedback -
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CORRECT ANSWERS ✔✔A) regenerative feedback |\ |\ |\ |\




45) If the positive alteration of a square wave is 100 µsec
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in duration, then the PRF is:
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A) 5 kHz B) 10 kHz
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C) 50 kHz D) 100 kHz - CORRECT ANSWERS ✔✔45) A *PRT
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includes negative alternation = 200 µsec tota
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46) What type of output waveform is produced by an
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astable multivibrator? |\




A) Sine wave B) Saw tooth
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C) Square wave or rectangular D) Rectangular wave -
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CORRECT ANSWERS ✔✔C) Square wave or rectangular |\ |\ |\ |\ |\ |\




47) The astable multivibrator is a:
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A) Sweep generator B) Divide by two circuit
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C) Time base generator D) Free running oscillator -
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CORRECT ANSWERS ✔✔D) Free running oscillator |\ |\ |\ |\ |\

, 48) The monostable multivibrator output PRF is
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determined by the: |\ |\




A) Input trigger frequency B) width of the input trigger
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C) Cutoff time of Q1 and Q2 D) discharge time of C1 and
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C2 - CORRECT ANSWERS ✔✔A) Input trigger frequency
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49) With a transistor amplifier operating in class B, the
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collector current will flow for what percentage/how many
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degrees of the input signal? [Alternate: "the amplifier's
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collector current is cutoff for:"] A) 10% B) 20% C) 50% D)
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70.7%
(or)
A) 90o B) 360o C) 180o D) More than 180o but less than
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360o - CORRECT ANSWERS ✔✔C) 180o
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51) The interchange of energy between the inductor and
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capacitor in a tank circuit is called what? |\ |\ |\ |\ |\ |\ |\




A) Damping B) degeneration
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C) Loading effect D) the flywheel effect - CORRECT
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ANSWERS ✔✔D) the flywheel effect |\ |\ |\ |\




52) The amplifier's class of operation is determined by
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what?
A) Fidelity B) efficiency
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