MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Power Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In the current limit control method, when the load current reaches a predefined lower value, then |
| A. | the chopper is switched off |
| B. | the chopper is switched on |
| C. | the source voltage is removed |
| D. | load voltage goes to zero |
| Answer» C. the source voltage is removed | |
| 2. |
Which of the following mentioned control strategy/strategies would require a feedback loop? |
| A. | pwm |
| B. | constant frequency system |
| C. | current limit control |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 3. |
In the current limit control method, the chopper is switched off when |
| A. | load current reaches the lower limit |
| B. | load current reaches the upper limit |
| C. | load current falls to zero |
| D. | none of the mentioned |
| Answer» C. load current falls to zero | |
| 4. |
WHICH_OF_THE_FOLLOWING_MENTIONED_CONTROL_STRATEGY/STRATEGIES_WOULD_REQUIRE_A_FEEDBACK_LOOP??$ |
| A. | pwm |
| B. | constant frequency system |
| C. | current limit control |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 5. |
In_the_current_limit_control_method,_when_the_load_current_reaches_a_predefined_lower_value,_then$ |
| A. | the chopper is switched off |
| B. | the chopper is switched on |
| C. | the source voltage is removed |
| D. | load voltage goes to zero |
| Answer» C. the source voltage is removed | |
| 6. |
In the current limit control method, the chopper is switched off whe? |
| A. | load current reaches the lower limit |
| B. | load current reaches the upper limit |
| C. | load current falls to zero |
| D. | none of the mentioned |
| Answer» C. load current falls to zero | |
| 7. |
The control strategy in which on and off time is guided by the pervious set of values of a certain parameter is called as |
| A. | time ratio control |
| B. | pulse width modulation |
| C. | current limit control |
| D. | constant frequency scheme |
| Answer» D. constant frequency scheme | |
| 8. |
In case of frequency modulation system, ________ is kept constant. |
| A. | T |
| B. | Ton |
| C. | Toff |
| D. | Either Ton or Toff |
| Answer» E. | |
| 9. |
In case of a constant frequency system, Ton = (1/4)T. If the chopping frequency 2 kHz, find the value of Toff. |
| A. | (1/8) ms |
| B. | (3/8) ms |
| C. | (1/8) μs |
| D. | (3/8) μs |
| Answer» C. (1/8) ‚âà√≠¬¨‚à´s | |
| 10. |
In pulse width modulation scheme, _________ is kept constant. |
| A. | Vs |
| B. | Ton |
| C. | T |
| D. | Toff |
| Answer» C. T | |
| 11. |
In case of variable frequency system __________ is varied |
| A. | T |
| B. | Ton |
| C. | Toff |
| D. | supply frequency |
| Answer» B. Ton | |
| 12. |
In constant frequency TRC or pulse width modulation scheme, ________ is varied. |
| A. | Vs |
| B. | Ton |
| C. | T |
| D. | f |
| Answer» C. T | |
| 13. |
In case of TRC (Time Ratio Control), _________ is varied |
| A. | duty cycle |
| B. | firing angle |
| C. | supply frequency |
| D. | supply voltage magnitude |
| Answer» B. firing angle | |