NCATT Exam 2025 Questions and
Answers
The "negative temperature coefficient" of a thermistor means that as temperature
increase resistance will?
Increase
Decrease
Remain the same - ✔✔Decrease
Using the swamping resistor of thermal stability, what type of feedback is developed to
control the amplifier?
Regenerative
Degenerative
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 1
,Positive feedback - ✔✔Degerative
Which of the following devices is used to dissipate heat into the air?
Heat sink
Circuit Board
Swamping resistor
Coupling Capacitor - ✔✔Heat sink
What type of amplifier coupling is used that can amplify DC voltages as well as AC
signals?
LC
RC
Direct
Transformer - ✔✔Direct
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 2
,In a common base amplifier, degenerative feedback is how many degrees out of phase
with the input signal?
0 degrees
90 degrees
180 degrees
270 degrees - ✔✔180 degrees
The common base amplifier has a voltage gain _______ than one, but a current gain
_______ than one.
Less than one, less than one
Greater than one, less than one
Less than one, greater than one
Greater than one, greater than one - ✔✔Greater than one, less than one
What type of waveform is produced by a sinusoidal oscillator?
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 3
, Saw tooth
Sine wave
Square wave
Rectangular - ✔✔Sine Wave
The basic requirements for sustaining oscillations in an oscillator are a power supply,
FDD, amplifier, and ______.
Regenerative feedback
degenerative feedback
negative feedback - ✔✔regenerative feedback
[App. A, Fig. 1] The components that control the time between t0 and t1 for Q1 are:
C3, R7, R6, and R5
C4, R8, R6, and R5
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 4
Answers
The "negative temperature coefficient" of a thermistor means that as temperature
increase resistance will?
Increase
Decrease
Remain the same - ✔✔Decrease
Using the swamping resistor of thermal stability, what type of feedback is developed to
control the amplifier?
Regenerative
Degenerative
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 1
,Positive feedback - ✔✔Degerative
Which of the following devices is used to dissipate heat into the air?
Heat sink
Circuit Board
Swamping resistor
Coupling Capacitor - ✔✔Heat sink
What type of amplifier coupling is used that can amplify DC voltages as well as AC
signals?
LC
RC
Direct
Transformer - ✔✔Direct
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 2
,In a common base amplifier, degenerative feedback is how many degrees out of phase
with the input signal?
0 degrees
90 degrees
180 degrees
270 degrees - ✔✔180 degrees
The common base amplifier has a voltage gain _______ than one, but a current gain
_______ than one.
Less than one, less than one
Greater than one, less than one
Less than one, greater than one
Greater than one, greater than one - ✔✔Greater than one, less than one
What type of waveform is produced by a sinusoidal oscillator?
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 3
, Saw tooth
Sine wave
Square wave
Rectangular - ✔✔Sine Wave
The basic requirements for sustaining oscillations in an oscillator are a power supply,
FDD, amplifier, and ______.
Regenerative feedback
degenerative feedback
negative feedback - ✔✔regenerative feedback
[App. A, Fig. 1] The components that control the time between t0 and t1 for Q1 are:
C3, R7, R6, and R5
C4, R8, R6, and R5
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 4
