A single phase full bridge inverter for R-L loads needs 4 thyristors 4 thyristor

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Question
A single phase full bridge inverter for R-L loads needs
Options
A. 4 thyristors
B. 4 thyristors and 4 diodes
C. 4 thyristors and 2 diodes
D. 8 thyristors

Correct Answer

4 thyristors and 4 diodes

Power Electronics problems

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1. In a cycloconverter it is possible to vary
Options
A. only output frequency
B. only output voltage
C. both output voltage and frequency but not simultaneously
D. both output voltage and output frequency simultaneously

4. Assertion (A): An ac regulator uses natural commutation
Reason (R): An ac regulator can be used for static on load tap changing of transformer.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

8. Assertion (A): McMurray Bredford half bridge inverter uses complementary commutation
Reason (R): Three phase inverter can have two modes of operation.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

9. A single phase semiconverter is supplying RLE load and has a freewheeling diode across the load. The firing angle is a. The freewheeling diode conducts for
Options
A. a� in each half cycle
B. (p - a)� in each cycle
C. a� in one full cycle
D. (p + a)� in each half cycle

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