Electronics and Communication Engineering - Power Electronics

26. 

In a stud mounted SCR, the stud is

A. in thermal contact with heat sink
B. insulated from heat sink
C. in electrical and thermal contact with heat sink
D. in either electrical or thermal contact with heat sink

Answer: Option C

Explanation:

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27. 

In pulse width modulation of chopper

A. T is kept constant and Ton is varied
B. Ton is kept constant T is varied
C. both T and Ton are varied
D. either T or Ton is varied

Answer: Option A

Explanation:

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28. 

In a full bridge inverter, the waveshape of load current depends on

A. relative values of load parameters R, L and C
B. relative values of load parameters R and L
C. relative values of load parameters L and C
D. gating frequency

Answer: Option A

Explanation:

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29. 

The characteristics of which device has peak point and valley point

A. SCR
B. PUT
C. SCS
D. Shockley diode

Answer: Option B

Explanation:

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30. 

In a step down chopper using time ratio control, the input voltage is V and duty cycle is a. The load is purely resistive having resistance R. The average and rms load currents are

A.
B.
C.
D.

Answer: Option B

Explanation:

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