MCQOPTIONS
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MCQOPTIONS
This section includes 554 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 551. |
A single phase half wave controlled rectifier circuit has a free wheeling diode. The load is a combination of R and L. The firing angle is a. The period of conduction of SCR and free wheeling diode respectively are |
| A. | a < ωt < p and p < ωt < (2p + a) |
| B. | a < ωt < p and p < ωt < 2p |
| C. | a < ωt < (p + a) and (p + a) < ωt < 2p |
| D. | a < ωt < p and p < ωt < (2p - a) |
| Answer» B. a < œât < p and p < œât < 2p | |
| 552. |
In a single phase full wave ac regulator feeding R-L load, the gate pulses |
| A. | are always of short duration |
| B. | may be of short duration |
| C. | should be rectangular with width (p - a) |
| D. | cannot be rectangular with width (p - a) |
| Answer» D. cannot be rectangular with width (p - a) | |
| 553. |
Two thyristor of same rating and same specifications |
| A. | will have equal turn on and turn off periods |
| B. | will have equal turn on but unequal turn off periods |
| C. | may have equal or unequal turn on and turn off periods |
| D. | will have unequal turn on and turn off periods |
| Answer» D. will have unequal turn on and turn off periods | |
| 554. |
A cycloconverter can be |
| A. | step down |
| B. | step up |
| C. | step down or step up |
| D. | none of the above |
| Answer» D. none of the above | |