Electronics and Communication Engineering - Power Electronics

46. 

The turn on characteristics of a power transistor can be assumed to be linear, as shown in the below figure . During turn on time T, voltage reduces linearly from V to 0 and current rises linearly from 0 to I. The energy loss during time T is

A. VIT
B.
C.
D.

Answer: Option D

Explanation:

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47. 

The circuit in figure is for

A. resonant commutation
B. self commutation
C. load commutation
D. auxiliary commutation

Answer: Option B

Explanation:

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48. 

A single phase half bridge inverter required to feed R-L loads needs

A. 2 thyristors
B. 4 thyristors
C. 2 thyristors and two diodes
D. 4 thyristors and 4 diodes

Answer: Option C

Explanation:

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49. 

Typical values of for an SCR are in the range of

A. 1 to 10
B. 25 to 500
C. 0.1 to 1
D. 1000 to 2000

Answer: Option B

Explanation:

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50. 

When a dc chopper feeds an RLE load, the load current, during steady state operation

A. remains constant
B. varies between maximum and minimum values
C. may remain constant or vary
D. is constant if R is constant

Answer: Option B

Explanation:

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