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. |
In a B-2 type full controlled bridge converter |
| A. | one SCR conducts at a time |
| B. | two SCRs conduct at a time |
| C. | three SCRs conduct at a time |
| D. | four SCRs conduct at a time |
| Answer» C. three SCRs conduct at a time | |
| 2. |
A single phase full controlled bridge converter (B-2) uses |
| A. | 4 SCRs and 2 diodes |
| B. | 4 SCRs |
| C. | 6 SCRs |
| D. | 4 SCRs and 2 diodes |
| Answer» C. 6 SCRs | |
| 3. |
A single phase full-converter using R load is a _________ quadrant converter and that using an RL load without FD is a __________ quadrant converter |
| A. | one, one |
| B. | two, one |
| C. | one, two |
| D. | two, two |
| Answer» D. two, two | |
| 4. |
A fully controlled converter uses |
| A. | diodes only |
| B. | thyristors only |
| C. | both diodes and thyristors |
| D. | none of the mentioned |
| Answer» C. both diodes and thyristors | |
| 5. |
Find the expression for the average value of the output voltage for the below given circuit. Consider the load current to be continuous, firing angle = α, transformer ration 1:1 and Vs = Vm sinωt. |
| A. | (Vm/π)cosα |
| B. | (Vm/π)(1+cosα) |
| C. | (2Vm/π)cosα |
| D. | (2Vm/π)(1+cosα) |
| Answer» D. (2Vm/π)(1+cosα) | |
| 6. |
The circuit turn-off time of M-2 type connection is |
| A. | π/ω |
| B. | α/ω |
| C. | π-α/ω |
| D. | π+α/ω |
| Answer» D. π+α/ω | |
| 7. |
For the circuit below, the transformer ratio is 1:1 and Vs = Vm sinωt. When T1 is forward biased and is triggered at α than T2 is |
| A. | subjected to a forward voltage of Vm sinα |
| B. | subjected to a forward voltage of 2Vm sinα |
| C. | subjected to a reverse voltage of Vm sinα |
| D. | subjected to a reverse voltage of 2Vm sinα |
| Answer» E. | |
| 8. |
For a single pulse M-2 rectifier with RL load and firing angle α >0°, the value of the inductance L is such that the load current is continuous.Choose the correct statement. |
| A. | The load current can never be positive |
| B. | The load current can never be negative |
| C. | The load current can never be zero |
| D. | The load current is a constant DC |
| Answer» D. The load current is a constant DC | |
| 9. |
In the below shown circuit, considering the load to be purely R load, the thyristor T2 would conduct from ωt = |
| A. | 0 to π |
| B. | α to π |
| C. | π+α to 2π |
| D. | π to 2π+α |
| Answer» D. π to 2π+α | |
| 10. |
The below shown single phase controlled rectifier configuration is a |
| A. | two pulse M-2 Connection |
| B. | two pulse B-2 Connection |
| C. | single pulse M-2 Connection |
| D. | single pulse B-2 Connection |
| Answer» B. two pulse B-2 Connection | |