MCQOPTIONS
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MCQOPTIONS
This section includes 35 Mcqs, each offering curated multiple-choice questions to sharpen your Analog Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The unwanted characteristics of amplifier output apart from the desired output is collectively termed as ___________ |
| A. | Inefficiency |
| B. | Damage |
| C. | Fault |
| D. | Distortion |
| Answer» E. | |
| 2. |
Input stage of power amplifier is also called ___________ |
| A. | First op |
| B. | Beginning stage |
| C. | Front end |
| D. | Normal stage |
| Answer» D. Normal stage | |
| 3. |
The use of amplifier in a circuit is to _____________ for input signal. |
| A. | Provide a phase shift |
| B. | Provide strength |
| C. | Provide frequency enhancement |
| D. | Make circuit compatible |
| Answer» C. Provide frequency enhancement | |
| 4. |
Unit of power rating of a transistor is expressed in ___________ |
| A. | Watts |
| B. | KWh |
| C. | W/s |
| D. | Wh |
| Answer» B. KWh | |
| 5. |
Power amplifier directly amplifies ___________ |
| A. | Voltage of signal |
| B. | Current of the signal |
| C. | Power of the signal |
| D. | All of the mentioned |
| Answer» E. | |
| 6. |
Which device was used for the amplification of audio signals before the invention of power amplifiers? |
| A. | Diode |
| B. | Op-amp |
| C. | Vacuum tubes |
| D. | SCR |
| Answer» D. SCR | |
| 7. |
Which of the following is not a reason for distortion in amplifier output? |
| A. | Incorrect biasing level |
| B. | Sinusoidal input |
| C. | Non- linear amplification |
| D. | Large input signal |
| Answer» E. | |
| 8. |
Which of the following amplifier is most suited for making tuning circuits? |
| A. | Class A |
| B. | Class B |
| C. | Class C |
| D. | Class D |
| Answer» D. Class D | |
| 9. |
Harmonic distortion is caused by nonlinearities of _________ |
| A. | Voltage divider circuit |
| B. | Resistive elements only |
| C. | Passive elements |
| D. | Active elements |
| Answer» E. | |
| 10. |
The distortion caused by multiple frequencies in output is called _________ |
| A. | Amplifier distortion |
| B. | Harmonic distortion |
| C. | Phase distortion |
| D. | None of the mentioned |
| Answer» C. Phase distortion | |
| 11. |
Which of the following class have a theoretical efficiency of 78.5%? |
| A. | Class A |
| B. | Class D |
| C. | Class C |
| D. | Class B |
| Answer» E. | |
| 12. |
Phase distortion can also be called as _________ |
| A. | Frequency distortion |
| B. | Amplitude distortion |
| C. | Delay distortion |
| D. | Harmonic distortion |
| Answer» D. Harmonic distortion | |
| 13. |
Amplitude distortion is due to ___________ |
| A. | Shift in Q-point |
| B. | Change in input |
| C. | Linear amplification |
| D. | Small input signal |
| Answer» B. Change in input | |
| 14. |
Frequency distortion occurs when _______ is varied with frequency. |
| A. | Amplitude |
| B. | Amplification |
| C. | Distortion |
| D. | Output |
| Answer» C. Distortion | |
| 15. |
The problem in which output signal is not an exact reproduction of output signal in amplifier is collectively called __________ |
| A. | Thermal runaway |
| B. | Phase error |
| C. | Distortion |
| D. | Biasing error |
| Answer» D. Biasing error | |
| 16. |
For a perfect power amplifier output power rating will be ________ if the output impedance is halved. |
| A. | Halved |
| B. | Squared |
| C. | Doubled |
| D. | Square rooted |
| Answer» D. Square rooted | |
| 17. |
Which of the following audio speaker will be hard to be driven by a power amplifier? |
| A. | 4ohm |
| B. | 8ohm |
| C. | 12ohm |
| D. | 2ohm |
| Answer» E. | |
| 18. |
The power rating of the amplifier is 100watts then the transistor can only operate at ___________ |
| A. | Power higher than 100w |
| B. | Power lower than 100w |
| C. | Power near to 100w |
| D. | Power lower than 200W |
| Answer» C. Power near to 100w | |
| 19. |
Transistor in power amplifier is ___________ |
| A. | An active device |
| B. | A passive device |
| C. | A op-amp |
| D. | A voltage generating device |
| Answer» B. A passive device | |
| 20. |
Which of the following components in a transistor circuit is really responsible for harmonic distortion? |
| A. | Capacitor |
| B. | Resistor |
| C. | Transistor |
| D. | Inductance |
| Answer» D. Inductance | |
| 21. |
In three-point method the harmonics which are considered for calculating distortion is __________ |
| A. | First harmonics only |
| B. | First and Second harmonics only |
| C. | First, Second and Third harmonics only |
| D. | Second and Third harmonics only |
| Answer» C. First, Second and Third harmonics only | |
| 22. |
If D1, D2, D3, D4 are the distortion produced by second, third, fourth, fifth respectively (others are insignificant). Then total harmonic distortion is __________ |
| A. | v(D12+D22+D32+D42) |
| B. | v(D12+D32) |
| C. | v(D22+D42) |
| D. | v(D12+D22) |
| Answer» B. v(D12+D32) | |
| 23. |
Which of the following heat sink is more durable? |
| A. | Stamped heat sink |
| B. | Ball bearing type heat sink |
| C. | Sleeve bearing type heat sink |
| D. | Aluminum heat sink |
| Answer» E. | |
| 24. |
THD+N is a scale used to expressing _______ of an audio amplifier. |
| A. | Gain |
| B. | Sound quality |
| C. | Amplification factor |
| D. | Distortion |
| Answer» C. Amplification factor | |
| 25. |
Active heat sinks are also called as ___________ |
| A. | fans |
| B. | on sinks |
| C. | high sinks |
| D. | normal sinks |
| Answer» B. on sinks | |
| 26. |
Aluminum heat sink is also called ___________ |
| A. | Folded-Fin heat sink |
| B. | Bonded-Fin heat sink |
| C. | Sleeve bearing type heat sink |
| D. | Extrusion heat sink |
| Answer» E. | |
| 27. |
Active heat sinks are less durable than passive heat sink because of the presents of __________ |
| A. | Complex electrical network |
| B. | Non-metal components |
| C. | Metal components |
| D. | Moving components |
| Answer» D. Moving components | |
| 28. |
Difference between active heat sink and passive heat sink is that passive heat sink? |
| A. | Possess mechanical components |
| B. | Possess electrical components |
| C. | Do not possess mechanical components |
| D. | Do not possess metal components |
| Answer» D. Do not possess metal components | |
| 29. |
Power delivered to load calculated by five-point method can be equal to __________(Pac is power delivered to load without distortion and D is the RMS of all Harmonic distortion) |
| A. | Pac (1-D2) |
| B. | Pac/D2 |
| C. | Pac (1+D2) |
| D. | Pac D2 |
| Answer» D. Pac D2 | |
| 30. |
Passive heat sinks are made of ________________ |
| A. | Copper |
| B. | Aluminum |
| C. | Iron |
| D. | Zinc |
| Answer» C. Iron | |
| 31. |
If water is used as a cooling medium then it is termed as _______________ |
| A. | liquid plate |
| B. | aqua plate |
| C. | hot plate |
| D. | cold plate |
| Answer» E. | |
| 32. |
De-rating factor is usually expressed in ___________ |
| A. | W/°C |
| B. | °C/W |
| C. | W/s |
| D. | kW/K |
| Answer» B. °C/W | |
| 33. |
Which of the following heat sink is used for low power application? |
| A. | Stamped heat sink |
| B. | Machining heat sink |
| C. | Aluminum heat sink |
| D. | Bolded-Fin heat sink |
| Answer» B. Machining heat sink | |
| 34. |
Cavities embedded in heat source is also known as ___________ |
| A. | Low sink |
| B. | Sink hole |
| C. | On-sink |
| D. | Inverted sink |
| Answer» E. | |
| 35. |
By dividing volumetric thermal resistance by required thermal resistance we will obtain ___________ |
| A. | Power dissipation of heat sink |
| B. | Volume of heat sink |
| C. | Maximum temperature of heat sink |
| D. | Volume of surrounding air |
| Answer» C. Maximum temperature of heat sink | |