NCATT Exam 2025 Questions and
Answers
Negative Temperature coefficient: As temperature increases, resistance..... -
✔✔Decreases
Using a swamping resister for thermal stability, what type of feedback is developed to
control the amplifier? - ✔✔Degenerative
What dissipates heat into the air? - ✔✔Heatsink
What amplifier coupling can amplify DC voltages as well as AC signals? - ✔✔Direct
Coupler
In a common collector amp, degenerative feedback is how many degrees out of phase
with the input signal? - ✔✔180
The common base amplifier has a voltage gain _______ than one, but the current
gain______than one - ✔✔Greater. Less.
Sinusoidal Oscillator produces what waveform? - ✔✔Sine
Requirements for sustaining oscillations in an oscillator - ✔✔Power supply, FDD,
Amplifier, Regenerative Feedback
What determines width output pulses in a bistable multivibrator? - ✔✔PRT of the input
triggers
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 1
, Bi-stable multvibrator also known as - ✔✔Flip-flop/frequency divider
What type of output wave is created by an astable multivibrator? - ✔✔square wave or
rectangle wave
Astable multivibrator is a what type of oscillator - ✔✔Free running oscillator
The monostable multivibrator output PRF is determined by the - ✔✔input trigger
frequency
Transistor amplifier operating in class B, collector current will flow_____of the input
signal? - ✔✔180 or 50%
Class A amplifier - ✔✔360 or 100%
Class C amplifier - ✔✔90 degrees or less than 50%
Class AB amplifier - ✔✔More than 180%, less than 360 degrees
What type of amplifier coupling is used for impedence matching and circuit isolation? -
✔✔Transformer
The interchange of energy between the inductor and capacitor in a tank circuit is called
- ✔✔Flywheel effect
Amplifier class of operation is determined by - ✔✔Amount of forward bias
what is resistance of normally closed contacts when the relay is de-energized - ✔✔0 or
short
What distinguishes a solenoid from a basic relay? - ✔✔Plunger is pulled into the coil
What part of a basic relay returns the armature to its de-energized position - ✔✔Spring
What parts of a relay comprise the primary (control) circuit? - ✔✔Core and Coil
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 2
Answers
Negative Temperature coefficient: As temperature increases, resistance..... -
✔✔Decreases
Using a swamping resister for thermal stability, what type of feedback is developed to
control the amplifier? - ✔✔Degenerative
What dissipates heat into the air? - ✔✔Heatsink
What amplifier coupling can amplify DC voltages as well as AC signals? - ✔✔Direct
Coupler
In a common collector amp, degenerative feedback is how many degrees out of phase
with the input signal? - ✔✔180
The common base amplifier has a voltage gain _______ than one, but the current
gain______than one - ✔✔Greater. Less.
Sinusoidal Oscillator produces what waveform? - ✔✔Sine
Requirements for sustaining oscillations in an oscillator - ✔✔Power supply, FDD,
Amplifier, Regenerative Feedback
What determines width output pulses in a bistable multivibrator? - ✔✔PRT of the input
triggers
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 1
, Bi-stable multvibrator also known as - ✔✔Flip-flop/frequency divider
What type of output wave is created by an astable multivibrator? - ✔✔square wave or
rectangle wave
Astable multivibrator is a what type of oscillator - ✔✔Free running oscillator
The monostable multivibrator output PRF is determined by the - ✔✔input trigger
frequency
Transistor amplifier operating in class B, collector current will flow_____of the input
signal? - ✔✔180 or 50%
Class A amplifier - ✔✔360 or 100%
Class C amplifier - ✔✔90 degrees or less than 50%
Class AB amplifier - ✔✔More than 180%, less than 360 degrees
What type of amplifier coupling is used for impedence matching and circuit isolation? -
✔✔Transformer
The interchange of energy between the inductor and capacitor in a tank circuit is called
- ✔✔Flywheel effect
Amplifier class of operation is determined by - ✔✔Amount of forward bias
what is resistance of normally closed contacts when the relay is de-energized - ✔✔0 or
short
What distinguishes a solenoid from a basic relay? - ✔✔Plunger is pulled into the coil
What part of a basic relay returns the armature to its de-energized position - ✔✔Spring
What parts of a relay comprise the primary (control) circuit? - ✔✔Core and Coil
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 2
