MCQOPTIONS
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MCQOPTIONS
This section includes 8 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. |
A single phase thyristorized ac voltage controller operating with firing angle α feeds a R - L load. The conduction angle of the thyrister is: |
| A. | π - α |
| B. | 2π - α |
| C. | π - 2α |
| D. | β - α |
| Answer» E. | |
| 2. |
For which of the following is the frequency is constant from input to output? |
| A. | AC voltage controller |
| B. | Chopper |
| C. | Inverter |
| D. | Cyclo-converter |
| Answer» B. Chopper | |
| 3. |
A single-phase half wave voltage controller consists of |
| A. | one SCR is parallel with one diode |
| B. | one SCR is anti parallel with one diode |
| C. | two SCRs in parallel |
| D. | two SCRs in anti parallel |
| Answer» C. two SCRs in parallel | |
| 4. |
In the principle of phase control |
| A. | the load is on for some cycles and off for some cycles |
| B. | control is achieved by adjusting the firing angle of the devices |
| C. | control is achieved by adjusting the number of on off cycles |
| D. | control cannot be achieved |
| Answer» C. control is achieved by adjusting the number of on off cycles | |
| 5. |
The AC voltage controllers are used in __________ applications. |
| A. | power generation |
| B. | electric heating |
| C. | conveyor belt motion |
| D. | power transmission |
| Answer» C. conveyor belt motion | |
| 6. |
Earlier then the semiconductor technology, ___________ devices were used for voltage control applications. |
| A. | cycloconverters |
| B. | vacuum tubes |
| C. | tap changing transformer |
| D. | induction machine |
| Answer» D. induction machine | |
| 7. |
In AC voltage controllers the |
| A. | variable ac with fixed frequency is obtained |
| B. | variable ac with variable frequency is obtained |
| C. | variable dc with fixed frequency is obtained |
| D. | variable dc with variable frequency is obtained |
| Answer» B. variable ac with variable frequency is obtained | |
| 8. |
AC voltage controllers convert |
| A. | fixed ac to fixed dc |
| B. | variable ac to variable dc |
| C. | fixed ac to variable ac |
| D. | variable ac to fixed ac |
| Answer» D. variable ac to fixed ac | |