NCATT
The "negative temperature coefficient" of a thermistor means that as temperature
increase resistance will?
Increase
Decrease
Remain the same - answerDecrease
Using the swamping resistor of thermal stability, what type of feedback is developed to
control the amplifier?
Regenerative
Degenerative
Positive feedback - answerDegerative
Which of the following devices is used to dissipate heat into the air?
Heat sink
Circuit Board
Swamping resistor
Coupling Capacitor - answerHeat sink
What type of amplifier coupling is used that can amplify DC voltages as well as AC
signals?
LC
RC
Direct
Transformer - answerDirect
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 - answer180 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 - answerGreater than one, less than one
What type of waveform is produced by a sinusoidal oscillator?
Saw tooth
Sine wave
Square wave
Rectangular - answerSine Wave
The basic requirements for sustaining oscillations in an oscillator are a power supply,
FDD, amplifier, and ______.
Regenerative feedback
degenerative feedback
negative feedback - answerregenerative 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
C4 and R9
, C3 and R9 - answerC4, R8, R6, and R5
[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 - answerDecrease Q1 cutoff time
[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 - answerIncrease; decrease
[App. A, Fig. 1] What is the discharge path for capacitor C3?
Q1 and R9
Q2 and R3
R7, R6, R5, Q1, and D1
R8, R6, R5, Q2, and D3 - answerR7, R6, R5, Q1, and D1
[App. A, Fig. 2] What is the phase relationship between the input and the output signals
(common base transistor)?
0 degree phase shift
90 degree phase shift
180 degree phase shift
270 degree phase shift - answer0 degree phase shift
The "negative temperature coefficient" of a thermistor means that as temperature
increase resistance will?
Increase
Decrease
Remain the same - answerDecrease
Using the swamping resistor of thermal stability, what type of feedback is developed to
control the amplifier?
Regenerative
Degenerative
Positive feedback - answerDegerative
Which of the following devices is used to dissipate heat into the air?
Heat sink
Circuit Board
Swamping resistor
Coupling Capacitor - answerHeat sink
What type of amplifier coupling is used that can amplify DC voltages as well as AC
signals?
LC
RC
Direct
Transformer - answerDirect
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 - answer180 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 - answerGreater than one, less than one
What type of waveform is produced by a sinusoidal oscillator?
Saw tooth
Sine wave
Square wave
Rectangular - answerSine Wave
The basic requirements for sustaining oscillations in an oscillator are a power supply,
FDD, amplifier, and ______.
Regenerative feedback
degenerative feedback
negative feedback - answerregenerative 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
C4 and R9
, C3 and R9 - answerC4, R8, R6, and R5
[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 - answerDecrease Q1 cutoff time
[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 - answerIncrease; decrease
[App. A, Fig. 1] What is the discharge path for capacitor C3?
Q1 and R9
Q2 and R3
R7, R6, R5, Q1, and D1
R8, R6, R5, Q2, and D3 - answerR7, R6, R5, Q1, and D1
[App. A, Fig. 2] What is the phase relationship between the input and the output signals
(common base transistor)?
0 degree phase shift
90 degree phase shift
180 degree phase shift
270 degree phase shift - answer0 degree phase shift
