Basic Science : Feedback Amplifier MULTIPLE CHOICE QUESTIONS AND ANSWERS :: part1 : 1 to 5
Following Basic Science multiple choice objective type questions and answers will help you in many types of 2024 job and other entrance examinations :
1.In a degenerative feedback amplifier the phase difference between the input signal and feedback signal is |
| 180° |
| 90° |
| 0° |
| 360° |
2.The voltage amplification factor of an amplifier without feedback is 20. When a positive feedback is given with a feedback fraction of 0.01, the gain with feedback is |
| 30 |
| 25 |
| 20 |
| 16.7 |
3.In amplifier, the feedback is positive if |
| the input of the amplifier is ahead of the voltage fed back by a phase angle of π/4 |
| the input of the amplifier is ahead of the voltage fed back by a phase difference of π/2 |
| the voltage fed back to the input circuit is in phase with the signal voltage |
| the output of the amplifier is exactly in phase with the voltage fed back to the input |
4.The overall gain of a multistage amplifier is 140. When negative feedback is applied, the gain is reduced to 17.5. Then the feedback ratio is |
| 1/10 |
| 1/15 |
| 1/5 |
| 1/20 |
5.In a feedback amplifier, if the feedback fraction β is positive, then the feedback is |
| degenerative |
| regenerative |
| negative |
| reverse |
More Feedback Amplifier MULTIPLE CHOICE QUESTIONS AND ANSWERS available in next pages
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