Electronics and Communication Engineering - Power Electronics

31. 

A fully controlled bridge converter is feeding an RLE load. The load current is I0. The input voltage is Vm sin ωt. The KVL equation to find firing angle a is

A. cos a = E + I0R
B. cos a = E + I0R
C. cos a = E - I0R
D. cos a = E - I0R

Answer: Option A

Explanation:

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32. 

A single phase cycloconverter with centre tapped input transformer requires

A. 2 thyristors
B. 4 thyristors
C. 8 thyristors
D. either 2 or 4 thyristors

Answer: Option B

Explanation:

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33. 

The duty cycle of a step down chopper is

A.
B.
C.
D.

Answer: Option A

Explanation:

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34. 

In a 3 phase bridge inverter with 120° mode of operation the. number of thyristors conducting at one time are

A. 1
B. 2
C. 3
D. 4

Answer: Option B

Explanation:

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35. 

A rectifier is fed by a transformer. The rms voltage and current at secondary of transformer are Vs and Is. Output dc power is Vdc Idc and output ac power is (Vrms ) (Irms), Transformer utilisation factor TUF is

A.
B.
C.
D.

Answer: Option A

Explanation:

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