MCQOPTIONS
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MCQOPTIONS
This section includes 13 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. |
The decaying factor in the wave shape of the output pulses from the pulse transformer is its |
| A. | transformer ratio |
| B. | inductance |
| C. | capacitance |
| D. | resistance |
| Answer» C. capacitance | |
| 2. |
RB1 = 3 kΩ & RB2 = 6 kΩ. Find the intrinsic stand-off ratio (η) of the UJT. |
| A. | 9 |
| B. | 1/3 |
| C. | 2/3 |
| D. | 3 |
| Answer» C. 2/3 | |
| 3. |
The improved version of the UJT oscillator triggering circuit is the |
| A. | ramp & pedal triggering |
| B. | rc triggering |
| C. | cosine-pulse triggering |
| D. | ramp triggering |
| Answer» B. rc triggering | |
| 4. |
RB1_=_3_K‚ÄÖ√Ñ√∂‚ÀÖ√´¬¨‚ÀÇ_&_RB2_=_6_K‚ÄÖ√Ñ√∂‚ÀÖ√´¬¨‚ÀÇ._FIND_THE_INTRINSIC_STAND-OFF_RATIO_(‚ÂÀ√≠‚ÄÖ√†√´)_OF_THE_UJT.?$# |
| A. | 9 |
| B. | 1/3 |
| C. | 2/3 |
| D. | 3 |
| Answer» C. 2/3 | |
| 5. |
The decaying factor in the wave shape of the output pulses from the pulse transformer is its$ |
| A. | transformer ratio |
| B. | inductance |
| C. | capacitance |
| D. | resistance |
| Answer» C. capacitance | |
| 6. |
The improved version of the UJT oscillator triggering circuit is th? |
| A. | ramp & pedal triggering |
| B. | rc triggering |
| C. | cosine-pulse triggering |
| D. | ramp triggering |
| Answer» B. rc triggering | |
| 7. |
If the gating circuits generator negative pulses, then those can be removed by using |
| A. | schmit triggers |
| B. | clippers |
| C. | clampers |
| D. | zener diodes |
| Answer» C. clampers | |
| 8. |
In case of a cosine firing scheme, __________ is used to get a cosine wave |
| A. | ic 555 |
| B. | a comparator |
| C. | an integrator circuit |
| D. | a differentiator circuit |
| Answer» D. a differentiator circuit | |
| 9. |
The pulse gating is not suitable of |
| A. | R loads |
| B. | RC loads |
| C. | RL loads |
| D. | It is suitable of every type of load |
| Answer» D. It is suitable of every type of load | |
| 10. |
The firing-angle delay is |
| A. | inversely proportional to the synchronizing transformer voltage |
| B. | inversely proportional to the control signal voltage |
| C. | directly proportional to the synchronizing transformer voltage |
| D. | directly proportional to the control signal voltage |
| Answer» E. | |
| 11. |
In the thyristor gating circuit, the ZCD is used to |
| A. | amplify the voltage |
| B. | produce a train of pulses |
| C. | convert AC input the ramp voltage |
| D. | used to step-down the voltage |
| Answer» D. used to step-down the voltage | |
| 12. |
In the thyristor gating circuit, the supply to the pulse amplifier is provided by the |
| A. | zcd |
| B. | isolation transformer |
| C. | synchronizing transformer |
| D. | control signal generator |
| Answer» C. synchronizing transformer | |
| 13. |
If the RC firing circuit used for firing an SCR is to be used to fire a TRIAC then |
| A. | the capacitor should be removed |
| B. | the diode should be replaced by a diac |
| C. | the diode should be replaced by a bjt |
| D. | the diode should be shorted using a resistor |
| Answer» C. the diode should be replaced by a bjt | |