MCQOPTIONS
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MCQOPTIONS
This section includes 6 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. |
___________ commutation technique is commonly employed in series inverters. |
| A. | line |
| B. | load |
| C. | forced |
| D. | external-pulse |
| Answer» C. forced | |
| 2. |
The natural reversal of ac supply voltage commutates the SCR in case of |
| A. | forced commutation |
| B. | only line commutation |
| C. | only natural commutation |
| D. | both line & natural commutation |
| Answer» E. | |
| 3. |
The type of commutation in which the pulse to turn off the SCR is obtained by separate voltage source is |
| A. | class B commutation |
| B. | class C commutation |
| C. | class D commutation |
| D. | class E commutation |
| Answer» E. | |
| 4. |
An SCR is connected in series with L = 5 mH and C = 20 F. Find the resonant frequency of the circuit. |
| A. | 2569 rad/s |
| B. | 3162 rad/s |
| C. | 2400 rad/s |
| D. | 7889 rad/s |
| Answer» C. 2400 rad/s | |
| 5. |
In case of class B commutation or resonant-pulse commutation with L = 5 H and C = 20 C with the initial voltage across the capacitor (Vs) = 230 V. Find the conduction time for auxiliary thyristor. |
| A. | 0.23 s |
| B. | 6.57 |
| C. | 31.41 s |
| D. | 56 s |
| Answer» D. 56 s | |
| 6. |
In case of class B commutation or resonant-pulse commutation with L = 5 H and C = 20 C with initial voltage across the capacitor (Vs) = 230 V. Find the peak value of resonant current. |
| A. | 560 A |
| B. | 460 A |
| C. | 360 A |
| D. | 260 A |
| Answer» C. 360 A | |