MCQOPTIONS
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MCQOPTIONS
This section includes 4 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. |
Latching current for an SCR is 100 mA, a dc source of 200 V is also connected to the SCR which is supplying an R-L load. Compute the minimum width of the gate pulse required to turn on the device. Take L = 0.2 H & R = 20 ohm both in series. |
| A. | 62.7 sec |
| B. | 100.5 sec |
| C. | 56.9 sec |
| D. | 81 sec |
| Answer» C. 56.9 sec | |
| 2. |
Consider the two transistor analogy of SCR, if 1 & if 2 are the common-base current gains of both the transistors then to turn-on the device |
| A. | <sub>1</sub> + <sub>2</sub> should approach zero |
| B. | <sub>1</sub> x <sub>2</sub> should approach unity |
| C. | <sub>1</sub> <sub>2</sub> should approach zero |
| D. | <sub>1</sub> + <sub>2</sub> should approach unity |
| Answer» E. | |
| 3. |
From the two transistor (T1 & T2) analogy of SCR, the total anode current of SCR is ___________ in the equivalent circuit. |
| A. | the sum of both the base currents |
| B. | the sum of both the collector current |
| C. | the sum of base current of T1 & collector current of T2 |
| D. | the sum of base current of T2 & collector current of T1 |
| Answer» C. the sum of base current of T1 & collector current of T2 | |
| 4. |
3.The average gate power dissipation for an SCR is 0.5 Watts the voltage applied to the gate is Vg = 10 V. What is the maximum value of current Ig for safe operation? |
| A. | 0.25 A |
| B. | 10 A |
| C. | 0.05 A |
| D. | 0.1 A |
| Answer» D. 0.1 A | |