# Electronics and Communication Engineering - Power Electronics

### Exercise :: Power Electronics - Section 8

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

Explanation:

No answer description available for this question. Let us discuss.

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

Explanation:

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33.

The duty cycle of a step down chopper is

 A. B. C. D. Explanation:

No answer description available for this question. Let us discuss.

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

Explanation:

No answer description available for this question. Let us discuss.

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. 