MCQOPTIONS
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MCQOPTIONS
This section includes 7 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. |
Find the value of the charging resistor in case of a UJT firing circuit with firing frequency of 2 kHz, C = 0.04 F, = 0.72 |
| A. | 5.62 k |
| B. | 37 k |
| C. | 4.23 k |
| D. | 9.82 k |
| Answer» E. | |
| 2. |
In the UJT firing circuit, the pulses are generated while the |
| A. | capacitor charges |
| B. | capacitor discharges |
| C. | capacitor voltage is zero |
| D. | there is no capacitor in a UJT firing circuit |
| Answer» C. capacitor voltage is zero | |
| 3. |
In case of the UJT firing circuit, when the UJT turns on |
| A. | the capacitor starts to charge |
| B. | the capacitor starts to discharge |
| C. | the capacitor remains unaffected |
| D. | there is no capacitor in a UJT firing circuit |
| Answer» C. the capacitor remains unaffected | |
| 4. |
The UJT terminals are |
| A. | E, B1 and B2 |
| B. | E1, E2 and B |
| C. | E, G and C |
| D. | G, S and D |
| Answer» B. E1, E2 and B | |
| 5. |
Pulse triggering can be only used by the _____________ type of triggering circuit |
| A. | R |
| B. | RC |
| C. | UJT |
| D. | RLC |
| Answer» D. RLC | |
| 6. |
For an RC full wave firing circuit the empirical formula for calculating the value of RC is |
| A. | RC = 157/ |
| B. | RC = 157 x |
| C. | RC = /157 |
| D. | RC = 157 x <sup>2</sup> |
| Answer» B. RC = 157 x | |
| 7. |
In case of an RC full wave firing circuit with R load, the voltage across the load is zero for____________ |
| A. | t = 0 to and t = to 2 + |
| B. | t = 0 to |
| C. | t = to 2 + |
| D. | t = to 2 |
| Answer» C. t = to 2 + | |