AET NCATT Questions with CORRECT Answers

AET NCATT Questions with CORRECT Answers

Question:
The "negative temperature coefficient" of a thermistor means that as temperature
increase resistance will?
Answer:
Increase


Question:
Decrease Remain the same
Answer:
Decrease


Question:
Using the swamping resistor of thermal stability, what type of feedback is developed to
control the amplifier?
Answer:
Regenerative


Question:
Degenerative Positive feedback
Answer:
Degerative


Question:
Which of the following devices is used to dissipate heat into the air?
Answer:
Heat sink


Question:
Circuit Board Swamping resistor Coupling Capacitor
Answer:
Heat sink

,Question:
What type of amplifier coupling is used that can amplify DC voltages as well as AC
signals?
Answer:
LC


Question:
RC Direct Transformer
Answer:
Direct


Question:
In a common base amplifier, degenerative feedback is how many degrees out of phase
with the input signal?
Answer:
0 degrees


Question:
90 degrees 180 degrees 270 degrees
Answer:
180 degrees


Question:
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
Answer:
Greater than one, less than one


Question:
What type of waveform is produced by a sinusoidal oscillator?
Answer:
Saw tooth

,Question:
Sine wave Square wave Rectangular
Answer:
Sine Wave


Question:
The basic requirements for sustaining oscillations in an oscillator are a power supply,
FDD, amplifier, and . Regenerative feedback degenerative feedback negative feedback
Answer:
regenerative feedback


Question:
[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 C4 and R9 C3 and R9
Answer:
C4, R8, R6, and R5


Question:
[App. A, Fig. 1] In the astable multivibrator, moving the arm of R6 to the right will (R6
resistance goes down, decreasing R8C4 time constant.) Decrease Q1 cutoff time
Decrease Q2 cutoff time Decrease discharge time of C3 Increase discharge time of C4
Answer:
Decrease Q1 cutoff time


Question:
[App. A, Fig. 1] Increasing the resistance of R5 will cause the astable multivibrator
output PRT to and the PRF to . (Both RC time constants increase) Increase; increase
Increase; decrease Decrease; decrease Decrease; increase
Answer:
Increase; decrease


Question:
[App. A, Fig. 1] What is the discharge path for capacitor C3?
Answer:
Q1 and R9

, Question:
Q2 and R3 R7, R6, R5, Q1, and D1 R8, R6, R5, Q2, and D3
Answer:
R7, R6, R5, Q1, and D1


Question:
[App. A, Fig. 2] What is the phase relationship between the input and the output signals
(common base transistor)?
Answer:
0 degree phase shift


Question:
90 degree phase shift 180 degree phase shift 270 degree phase shift
Answer:
0 degree phase shift


Question:
[App. A, Fig. 2] What is the purpose of R4 in the common base amplifier?
Answer:
Couple the output signal


Question:
Develop the input signal Develop the output signal Keep the base at AC ground
Answer:
Develop the input signal


Question:
[App. A, Fig. 3] In the RC coupled amplifier; the low frequency gain loss is due to the
reactance of what components? C1, C2, and C3 R1 and R4 R2 and R5 Q1 and Q2
Answer:
C1, C2, and C3