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Electrical Engineering
Amplifiers With Negative Feedback
Quiz 1
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Q.1
The value of negative feedback fraction is always ___________
Less than 1
More than 1
Equal to 1
None of the above
Q.2
When current feedback (negative) is applied to an amplifier, its output impedance
Is increased
Is decreased
Remains the same
None of the above
Q.3
Emitter follower is used for ___________
Current gain
Impedance matching
Voltage gain
None of the above
Q.4
Negative feedback is employed in ___________
Oscillators
Rectifiers
Amplifiers
None of the above
Q.5
When voltage feedback (negative) is applied to an amplifier, its input impedance ___________
Is decreased
Is increased
Remains the same
None of the above
Q.6
When current feedback (negative) is applied to an amplifier, its input impedance ___________
Is decreased
Is increased
Remains the same
None of the above
Q.7
When a negative voltage feedback is applied to an amplifier, its bandwidth___________
Is increased
Is decreased
Remains the same
Insufficient data
Q.8
If the output of an amplifier is 10 V and 100 mV from the output is fed back to the input, then feedback fraction is ___________
10
1
1
15
Q.9
If voltage feedback (negative) is applied to an amplifier, its output impedance ___________
Remains the same
Is increased
Is decreased
None of the above
Q.10
If the feedback fraction of an amplifier is 0.01, then voltage gain with negative feedback is approximately___________
500
100
1000
5000
Q.11
The gain of an amplifier without feedback is 100 db. If a negative feedback of 3 db is applied, the gain of the amplifier will become ___________
5 db
300 db
103 db
97 db
Q.12
The voltage gain of an emitter follower is ___________
Much less than 1
Approximately equal to 1
Greater than 1
None of the above
Q.13
The output impedance of an emitter follower is ___________
High
Very high
Almost zero
Low
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