MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
What is the expression for the value of the capacitor in the voltage commutation circuit? Let tc be the circuit turn off time and Io be the constant load current. |
| A. | Io x (dv/dt) |
| B. | Vs/Io |
| C. | (tc x Io)/Vs |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 2. |
Which type of commutation circuit does not work on no load? |
| A. | Voltage commutation |
| B. | Current commutation |
| C. | Both voltage and current commutation |
| D. | None of the mentioned |
| Answer» B. Current commutation | |
| 3. |
In a voltage commutated SCR, the main SCR is commutated by |
| A. | triggering the auxiliary SCR |
| B. | sending a negative pulse to the main SCR |
| C. | removing the supply Vs |
| D. | none of the mentioned |
| Answer» B. sending a negative pulse to the main SCR | |
| 4. |
In the below given circuit, when the main SCR T1 is commutated at t2, the load voltage is |
| A. | Vs |
| B. | 0 |
| C. | 2Vs |
| D. | Vs + Ldi/dt |
| Answer» D. Vs + Ldi/dt | |
| 5. |
In the below given circuit, when the main thyristor T1 is triggered after charging the capacitor, the commutation current flows through the path |
| A. | Vs – T1 – Load – Vs |
| B. | S – C – T1 – Load – S |
| C. | C – T1 – L – D – C |
| D. | C – T1 – TA – C |
| Answer» D. C – T1 – TA – C | |
| 6. |
In a voltage commutated chopper circuit, the capacitor C can be charged to Vs by |
| A. | gating T1 |
| B. | gating TA |
| C. | closing the switch |
| D. | both gating TA and closing the switch |
| Answer» E. | |
| 7. |
In the below shown voltage commutated chopper circuit, the chopper operation can only start when |
| A. | t1 is gated |
| B. | the capacitor is charged |
| C. | the diode is forward biased |
| D. | the capacitor is dis-charged |
| Answer» C. the diode is forward biased | |
| 8. |
Below given circuit is a |
| A. | current commutated chopper |
| B. | voltage commutated chopper |
| C. | load commutated chopper |
| D. | none of the mentioned |
| Answer» C. load commutated chopper | |
| 9. |
In case of current commutation of SCR |
| A. | a diode is connected in series with the main SCR |
| B. | a diode is connected in parallel with the main SCR |
| C. | a diode is connected in anti-parallel with the main SCR |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 10. |
The process of commutating a SCR by applying a reverse voltage to an SCR through a previously charged capacitor is called as |
| A. | capacitor commutation |
| B. | forced commutation |
| C. | voltage commutation |
| D. | current commutation |
| Answer» D. current commutation | |