Electronics and Communication Engineering - Power Electronics

41. 

If a step down chopper is fed by a dc voltage V with Ton and Toff are on and off periods then is

A. average output voltage
B. rms output voltage
C. average or rms output voltage depending on load
D. neither of the above

Answer: Option A

Explanation:

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42. 

A voltage VBB is applied across the terminals of a UJT. The emitter voltage at peak point is

A. hVBB
B. (h + 1) VBB
C. hVBB + VD
D. VD

Answer: Option C

Explanation:

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43. 

A single phase bridge type cycloconverter uses eight thyristors.

A. True
B. False

Answer: Option A

Explanation:

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44. 

In the circuit of figure, the waveshape of load current when thyristor conducting is

A. constant
B. increasing exponentially
C. decreasing exponentially
D. either (b) or (c)

Answer: Option B

Explanation:

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45. 

In the basic series inverter circuit, the source supplies load

A. only in positive half cycle
B. both in positive and negative half cycles
C. only in part of positive half cycle
D. in positive half cycle and part of negative half cycle

Answer: Option A

Explanation:

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