Amplifiers with Negative Feedback

1. A feedback circuit usually employsnetwork

1. Resistive
2. Capacitive
3. Inductive
4. None of the above

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2. An emitter follower hasinput impedance

1. Zero
2. Low
3. High
4. None of the above

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3. Emitter follower is acircuit

1. Voltage feedback
2. Current feedback
3. Both voltage and current feedback
4. None of the above

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4. Emitter follower is used for _________.

1. Current gain
2. Impedance matching
3. Voltage gain
4. None of the above

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5. If the feedback fraction of an amplifier is 0.01, then voltage gain with negative feedback is approximately_________.

1. 500
2. 100
3. 1000
4. 5000

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6. 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 _________.

1. 10
2. 1
3. 01
4. 15

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7. If voltage feedback (negative) is applied to an amplifier, its output impedance _________.

1. Remains the same
2. Is increased
3. Is decreased
4. None of the above

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8. Negative feedback is employed in _________.

1. Oscillators
2. Rectifiers
3. Amplifiers
4. None of the above

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9. The gain of an amplifier with feedback is known asgain

1. Resonant
2. Open loop
3. Closed loop
4. None of the above

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10. 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 _________.

1. 5 db
2. 300 db
3. 103 db
4. 97 db

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