Explore topic-wise MCQs in Power Electronics.

This section includes 7 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.

IN_A_THREE-PHASE_HALF_WAVE_6-PULSE_MID-POINT_TYPE_DIODE_RECTIFIER,_EACH_DIODE_CONDUCTS_FOR?$

A. 120°
B. 60°
C. 90°
D. 180°
Answer» C. 90¬¨¬®‚Äö√†√ª
Discussion
2.

A step-down delta-star transformer, with per-phase turns ration of 5, is fed from a 3-phase, 1100 V, 50 Hz source. The secondary of this transformer through a 3-pulse type rectifier feeds a R load of 10 Ω. Find the maximum value of the load current (phase).$#

A. ‚àö2 x 22 A
B. 1 x 11 A
C. ‚àö2 x 11 A
D. 1 x 22 A
Answer» B. 1 x 11 A
Discussion
3.

The average value of the output voltage, in a 3-phase half wave diode rectifier with Vml as the maximum line voltage value, is given by the expressio?

A. Vml/3π
B. 2Vml/3π
C. 3Vml/2π
D. 3Vml
Answer» D. 3Vml
Discussion
4.

In a three-phase half wave diode rectifier, if Vmp is the maximum phase voltage, then the output voltage on a R load varies from

A. 0 to Vmp
B. 0.5 Vmp to Vmp
C. Vmp to 3Vmp
D. –Vmp to Vmp
Answer» C. Vmp to 3Vmp
Discussion
5.

In a three-phase half wave diode rectifier using 3 diodes,

A. All diodes conduct together
B. Only two diodes conduct at a time
C. Only one diode conducts at a time
D. None of the above mentioned
Answer» D. None of the above mentioned
Discussion
6.

In a three-phase half wave diode rectifier using 3 diodes, each diode conducts for

A. 90 degrees
B. 120 degrees
C. 180 degrees
D. 360 degrees
Answer» C. 180 degrees
Discussion
7.

In a three-phase half wave rectifier usually, the primary side of the transformer is delta connected because

A. it has no neutral connection
B. we can get greater output voltage
C. it provides a path for the triplen harmonics
D. it provides better temperature stability
Answer» D. it provides better temperature stability
Discussion