Electronics and Communication Engineering - Power Electronics

26. 

The load circuit of a single phase full bridge inverter

A. must be underdamped
B. must be overdamped
C. may be underdamped or overdamped
D. may be any type of load

Answer: Option D

Explanation:

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27. 

When an SCR is reverse biased

A. two junctions are reverse biased and one junction is forward biased.
B. all the three junctions are reverse biased.
C. one junction is reverse biased and two junctions are forward biased.
D. any of the above depending on the magnitude of reverse bias.

Answer: Option A

Explanation:

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28. 

A dc series motor is coupled to a load whose torque is proportional to speed. It is fed by a single phase ac supply through a full converter. When speed is 500 rpm, firing angle is 45°. It is desired to raise the speed. It will be necessary to

A. decrease the firing angle
B. increase the firing angle
C. either decrease or increase the firing angle depending on the required speed
D. decrease the load torque

Answer: Option A

Explanation:

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29. 

In Jone chopper, the commutating element

A. is a capacitor
B. is a capacitor and an inductor
C. is a capacitor and an auto transformer
D. none of the above

Answer: Option C

Explanation:

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30. 

A LASCR has

A. 4 semiconductor layers and 3 junctions
B. 3 semiconductor layers and 2 junctions
C. 2 semiconductor layers and 2 junctions
D. any of these depending on the rating

Answer: Option A

Explanation:

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