MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
An SCR rectifier circuit is designed such that the average output voltage is 77.64 V & RMS value of output voltage is 145.873 V. Find the voltage ripple factor. |
| A. | 1.879 |
| B. | 0.532 |
| C. | 1.590 |
| D. | 0.629 |
| Answer» D. 0.629 | |
| 2. |
A single-pulse transformer with secondary voltage of 230 V, 50 Hz, delivers power to bulb of R = 10 through a half-wave controlled rectifier circuit. For = 60 and output AC power of 2127 Watts, find the rectification efficiency |
| A. | 98.6 % |
| B. | 42 % |
| C. | 28 % |
| D. | 19 % |
| Answer» D. 19 % | |
| 3. |
A single-pulse transformer with secondary voltage of 230 V, 50 Hz, delivers power to bulb of R = 10 through a half-wave controlled rectifier circuit. For = 60 , find the average current in the bulb |
| A. | 2.5 A |
| B. | 7.7 A |
| C. | 9.6 A |
| D. | 3 A |
| Answer» C. 9.6 A | |
| 4. |
A 230V, 50Hz, single-pulse SCR is feeding a RL load with = 40 and = 210 . Find the value of average output voltage |
| A. | 54 V |
| B. | 106 V |
| C. | 84 V |
| D. | 32 V |
| Answer» D. 32 V | |
| 5. |
A 230 V, 50 Hz, one-pulse SCR controlled converter has extinction angle = 210 . Find the circuit turn-off time |
| A. | 10 m-sec |
| B. | 0 |
| C. | 8.3 m-sec |
| D. | 5.4 m-sec |
| Answer» D. 5.4 m-sec | |
| 6. |
A single-phase half-wave rectifier with a FD is supplied by Vs = 240 V, 50 Hz, AC source with a load R = 10 , L = 0.8 mH. The firing angle is so adjusted such that the output voltage obtained is 100 V. Find the firing angle. |
| A. | 62 |
| B. | 102 |
| C. | 31 |
| D. | 47 |
| Answer» D. 47 | |