Explore topic-wise MCQs in Power Electronics.

This section includes 6 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.

A_SINGLE-PHASE_SEMI-CONVERTER_CIRCUIT_IS_SUPPLYING_POWER_TO_A_MOTOR_LOAD._THE_AVERAGE_VALUE_OF_LOAD_VOLTAGE_IS_176.72_V_AND_THE_RMS_VALUE_IS_219.3_V._FIND_THE_VRF_(VOLTAGE_RIPPLE_FACTOR).?$

A. 0
B. 0.735
C. 0.569
D. 2.48
Answer» C. 0.569
Discussion
2.

For_the_same_triggering_angle_and_ratings$

A. a semi-converter operates at lower output voltage than a full converter
B. a semi-converter operates at higher output voltage than a full converter
C. a semi-converter has lower values of input p.f as compared to a full converter
D. a semi-converter has more THD as compared to a full converter
Answer» C. a semi-converter has lower values of input p.f as compared to a full converter
Discussion
3.

A single-phase semi-converter is connected to a 230 V source and is feeding a load R = 10 Ω in series with a large inductance that makes the load current ripple free. For α = 45°, find the rectification efficiency. The RMS value of output voltage is 219.3 ?#

A. 96.54 %
B. 75.25 %
C. 89.45 %
D. 80.58 %
Answer» E.
Discussion
4.

A single-phase semi-converter is connected to a 230 V source and is feeding a load R = 10 Ω in series with a large inductance that makes the load current ripple free. Find the average output current for α = 45°.$

A. 14 A
B. 17 A
C. 10 A
D. 0 A
Answer» C. 10 A
Discussion
5.

In any AC-DC circuit, the freewheeling action

A. improves the power handling capabilities
B. increases the THD
C. improves CDF
D. all of the mentioned
Answer» D. all of the mentioned
Discussion
6.

A single-phase symmetrical semi-converter employs

A. one SCR and one diode in each leg
B. two SCRs and two diodes in each leg
C. two SCRs in each leg
D. two diodes in each leg
Answer» B. two SCRs and two diodes in each leg
Discussion