MCQOPTIONS
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MCQOPTIONS
This section includes 9 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. |
For a diode circuit the voltage across the capacitor is given by Vc(t)= Vs(1-e(-t/RC))Then the initial rate of change of capacitor voltage is given by |
| A. | 0 |
| B. | ∞ |
| C. | Vs x RC |
| D. | Vs/RC |
| Answer» E. | |
| 2. |
The time constant of a series RC circuit (τ) is given by |
| A. | R/C |
| B. | C/R |
| C. | RC |
| D. | 1/RC |
| Answer» D. 1/RC | |
| 3. |
A circuit is so formed such that source-R-L-diode-switch are all in series. Consider the initial current in L to be zero. The diode is so connected that it is forward biased when switch is closed.When the switch is closed, |
| A. | the current will decay exponentially & the voltage will increase exponentially |
| B. | the current will increase exponentially & the voltage will decay exponentially |
| C. | the current will fall to zero & the voltage both will decay exponentially |
| D. | the voltage and the current both remain constant |
| Answer» C. the current will fall to zero & the voltage both will decay exponentially | |
| 4. |
When a diode is connected in series with an AC source & R load, the conduction time per cycle is |
| A. | 0 |
| B. | 2π |
| C. | π |
| D. | π/2 |
| Answer» D. π/2 | |
| 5. |
A diode circuit is so arranged that when the switch is open it's KVL givesRi+ 1/C ∫i dt = 0When the switch is closed,Ri+ 1/C ∫i dt = VsVs is the dc supply voltage.The diode is so connected that it is forward biased when switch is closedThe circuit is mostly likely be a |
| A. | diode in parallel with Vs, switch, R & C |
| B. | diode in series with R, than parallel with Vs & C |
| C. | diode in series with the switch, R, C & Vs |
| D. | diode in series with R,C & Vs with the switch connected in parallel across Vs |
| Answer» D. diode in series with R,C & Vs with the switch connected in parallel across Vs | |
| 6. |
When diode is connected in series to an AC source & RL load, the conduction time for the diode |
| A. | is always less than π |
| B. | is 0 |
| C. | is π |
| D. | can be greater than π |
| Answer» E. | |
| 7. |
The time constant of a series RL circuit (τ) is given by |
| A. | R/L |
| B. | L/R |
| C. | RC |
| D. | 1/RL |
| Answer» B. L/R | |
| 8. |
WHEN_DIODE_IS_CONNECTED_IN_SERIES_TO_AN_AC_SOURCE_&_RL_LOAD,_THE_CONDUCTION_TIME_FOR_THE_DIODE?$ |
| A. | is always less than π |
| B. | is 0 |
| C. | is π |
| D. | can be greater than π |
| Answer» E. | |
| 9. |
When a diode is connected in series with an AC source & R load, the conduction time per cycle i? |
| A. | 0 |
| B. | 2π |
| C. | π |
| D. | π/2 |
| Answer» D. ‚âà√¨‚àö√ë/2 | |