MCQOPTIONS
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MCQOPTIONS
This section includes 79 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A class A power amplifier is sometimes called______________amplifier? |
| A. | Symmetrical |
| B. | Single-ended |
| C. | Reciprocating |
| D. | Differential |
| Answer» C. Reciprocating | |
| 2. |
A class A power amplifier uses _________________? |
| A. | Two transistors |
| B. | Three transistors |
| C. | One transistor |
| D. | None of the above |
| Answer» D. None of the above | |
| 3. |
A 2-transistor class B power amplifier is commonly called ______________ amplifier? |
| A. | Dual |
| B. | Push-pull |
| C. | Symmetrical |
| D. | Differential |
| Answer» C. Symmetrical | |
| 4. |
The disadvantage of impedance matching is that it ___________ |
| A. | Gives distorted output |
| B. | Gives low power output |
| C. | Requires a transformer |
| D. | None of the above |
| Answer» B. Gives low power output | |
| 5. |
The maximum efficiency of resistance loaded class A power amplifier is |
| A. | 5% |
| B. | 50% |
| C. | 30% |
| D. | 25% |
| Answer» E. | |
| 6. |
The class B push-pull circuit can deliver 100 W of a.c. output power. What should be the minimum power rating of each transistor? |
| A. | 20 W |
| B. | 40 W |
| C. | 10 W |
| D. | 80 W |
| Answer» B. 40 W | |
| 7. |
A class A power amplifier is sometimes called ___________ amplifier |
| A. | Symmetrical |
| B. | Single-ended |
| C. | Reciprocating |
| D. | Differential |
| Answer» C. Reciprocating | |
| 8. |
A 2-transistor class B power amplifier is commonly called ___________ amplifier |
| A. | Dual |
| B. | Push-pull |
| C. | Symmetrical |
| D. | Differential |
| Answer» C. Symmetrical | |
| 9. |
Transformer coupling can be used in ___________ amplifiers |
| A. | Either power or voltage |
| B. | Only power |
| C. | Only voltage |
| D. | None of the above |
| Answer» B. Only power | |
| 10. |
If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least ___________ |
| A. | 5 W |
| B. | 33 W |
| C. | 75 W |
| D. | 1 W |
| Answer» E. | |
| 11. |
When no signal is applied, the approximate collector efficiency of class A power amplifier is |
| A. | 10% |
| B. | 0% |
| C. | 25% |
| D. | 50% |
| Answer» C. 25% | |
| 12. |
The most costly coupling is ___________ coupling |
| A. | RC |
| B. | Direct |
| C. | Impedance |
| D. | Transformer |
| Answer» E. | |
| 13. |
If a transistor is operated in such a way that output current flows for 60° of the input signal, then it is ___________ operation |
| A. | Class A |
| B. | Class B |
| C. | Class C |
| D. | None of the above |
| Answer» D. None of the above | |
| 14. |
The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ? |
| A. | 10 W |
| B. | 15 W |
| C. | 5 W |
| D. | 20 W |
| Answer» E. | |
| 15. |
An AF amplifier is shielded to ___________ |
| A. | Keep the amplifier cool |
| B. | Protect from rusting |
| C. | Prevent induction due to stray magnetic fields |
| D. | None of the above |
| Answer» D. None of the above | |
| 16. |
Class ___________ operation gives the maximum distortion |
| A. | A |
| B. | B |
| C. | C |
| D. | AB |
| Answer» D. AB | |
| 17. |
For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation? |
| A. | 10 W |
| B. | 4 W |
| C. | 8 W |
| D. | None of the above |
| Answer» C. 8 W | |
| 18. |
The pulsating d.c. applied to power amplifier causes ___________ |
| A. | Burning of transistor |
| B. | Hum in the circuit |
| C. | Excessive forward voltage |
| D. | None of the above |
| Answer» C. Excessive forward voltage | |
| 19. |
Power amplifiers handle ___________ signals compare to voltage amplifiers |
| A. | Small |
| B. | Very small |
| C. | Large |
| D. | None of the above |
| Answer» D. None of the above | |
| 20. |
The output stage of a multistage amplifier is also called ___________ |
| A. | Mixer stage |
| B. | Power stage |
| C. | Detector stage |
| D. | F stage |
| Answer» C. Detector stage | |
| 21. |
The size of a power transistor is made considerably large to ___________ |
| A. | Provide easy handling |
| B. | Dissipate heat |
| C. | Facilitate connections |
| D. | None of the above |
| Answer» C. Facilitate connections | |
| 22. |
What turn ratio (Np/Ns) of transformer is required to match 4 Ω speaker to a transistor having an output impedance of 8000 O? |
| A. | 2 |
| B. | 7 |
| C. | 3 |
| D. | None of the above |
| Answer» C. 3 | |
| 23. |
The most important consideration in power amplifier is ___________ |
| A. | Biasing the circuit |
| B. | Collector efficiency |
| C. | To keep the transformer cool |
| D. | None of the above |
| Answer» C. To keep the transformer cool | |
| 24. |
The driver stage usually employs___________ |
| A. | Class A power amplifier |
| B. | Push-pull amplifier |
| C. | Class C amplifier |
| D. | None of the above |
| Answer» B. Push-pull amplifier | |
| 25. |
Power amplifiers generally use transformer coupling because transformer per-mits |
| A. | Cooling of the circuit |
| B. | Impedance matching |
| C. | Distortionless output |
| D. | Good frequency response |
| Answer» C. Distortionless output | |
| 26. |
A power amplifier has comparatively ___________ ß |
| A. | Small |
| B. | Large |
| C. | Very large |
| D. | None of the above |
| Answer» B. Large | |
| 27. |
If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion. |
| A. | Amplitude |
| B. | Intermodulation |
| C. | Frequency |
| D. | None of the above |
| Answer» D. None of the above | |
| 28. |
Low efficiency of a power amplifier results in ___________ |
| A. | Low forward bias |
| B. | Less battery consumption |
| C. | More battery consumption |
| D. | None of the above |
| Answer» D. None of the above | |
| 29. |
When a transistor is cut off___________ |
| A. | Maximum voltage appears across transistor |
| B. | Maximum current flows |
| C. | Maximum voltage appears across load |
| D. | None of the above |
| Answer» B. Maximum current flows | |
| 30. |
A transformer coupled class A power amplifier has a load of 100 Ω on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary? |
| A. | 5 kΩ |
| B. | 20 kΩ |
| C. | 100 kΩ |
| D. | 10 kΩ |
| Answer» E. | |
| 31. |
The driver stage usually employs___________%! |
| A. | Class A power amplifier |
| B. | Push-pull amplifier |
| C. | Class C amplifier |
| D. | None of the above |
| Answer» B. Push-pull amplifier | |
| 32. |
Power amplifiers generally use transformer coupling because transformer per-mits%! |
| A. | Cooling of the circuit |
| B. | Impedance matching |
| C. | Distortionless output |
| D. | Good frequency response |
| Answer» C. Distortionless output | |
| 33. |
A power amplifier has comparatively ___________ ß%! |
| A. | Small |
| B. | Large |
| C. | Very large |
| D. | None of the above |
| Answer» B. Large | |
| 34. |
A class A power amplifier is sometimes called ___________ amplifier%! |
| A. | Symmetrical |
| B. | Single-ended |
| C. | Reciprocating |
| D. | Differential |
| Answer» C. Reciprocating | |
| 35. |
If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least ___________%! |
| A. | 5 W |
| B. | 33 W |
| C. | 75 W |
| D. | 1 W |
| Answer» E. | |
| 36. |
The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?%! |
| A. | 10 W |
| B. | 15 W |
| C. | 5 W |
| D. | 20 W |
| Answer» E. | |
| 37. |
The size of a power transistor is made considerably large to ___________%! |
| A. | Provide easy handling |
| B. | Dissipate heat |
| C. | Facilitate connections |
| D. | None of the above |
| Answer» C. Facilitate connections | |
| 38. |
For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?%! |
| A. | 10 W |
| B. | 4 W |
| C. | 8 W |
| D. | None of the above |
| Answer» C. 8 W | |
| 39. |
If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion.%! |
| A. | Amplitude |
| B. | Intermodulation |
| C. | Frequency |
| D. | None of the above |
| Answer» D. None of the above | |
| 40. |
*/*_The disadvantage of impedance matching is that it ___________? |
| A. | Gives distorted output |
| B. | Gives low power output |
| C. | Requires a transformer |
| D. | None of the above |
| Answer» B. Gives low power output | |
| 41. |
*/*_If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion.? |
| A. | Amplitude |
| B. | Intermodulation |
| C. | Frequency |
| D. | None of the above |
| Answer» D. None of the above | |
| 42. |
*/*_A class A power amplifier is sometimes called ___________ amplifier? |
| A. | Symmetrical |
| B. | Single-ended |
| C. | Reciprocating |
| D. | Differential |
| Answer» C. Reciprocating | |
| 43. |
*/*_If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least ___________? |
| A. | 5 W |
| B. | 33 W |
| C. | 75 W |
| D. | 1 W |
| Answer» E. | |
| 44. |
*/*_The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?? |
| A. | 10 W |
| B. | 15 W |
| C. | 5 W |
| D. | 20 W |
| Answer» E. | |
| 45. |
*/*_The size of a power transistor is made considerably large to ___________? |
| A. | Provide easy handling |
| B. | Dissipate heat |
| C. | Facilitate connections |
| D. | None of the above |
| Answer» C. Facilitate connections | |
| 46. |
*/*_For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?? |
| A. | 10 W |
| B. | 4 W |
| C. | 8 W |
| D. | None of the above |
| Answer» C. 8 W | |
| 47. |
*/*_A 2-transistor class B power amplifier is commonly called ___________ amplifier? |
| A. | Dual |
| B. | Push-pull |
| C. | Symmetrical |
| D. | Differential |
| Answer» C. Symmetrical | |
| 48. |
*/*_When no signal is applied, the approximate collector efficiency of class A power amplifier is? |
| A. | 10% |
| B. | 0% |
| C. | 25% |
| D. | 50% |
| Answer» C. 25% | |
| 49. |
*/*_An AF amplifier is shielded to ___________? |
| A. | Keep the amplifier cool |
| B. | Protect from rusting |
| C. | Prevent induction due to stray magnetic fields |
| D. | None of the above |
| Answer» D. None of the above | |
| 50. |
*/*_What turn ratio (Np/Ns) of transformer is required to match 4 Ω speaker to a transistor having an output impedance of 8000 O?? |
| A. | 2 |
| B. | 7 |
| C. | 3 |
| D. | None of the above |
| Answer» C. 3 | |