A fully controlled bridge converter is feeding an RLE load. For some circuit con

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Question
A fully controlled bridge converter is feeding an RLE load. For some circuit conditions firing angle is 47�. If connections of battery are reversed, the firing angle is likely to be
Options
A. 47�
B. less than 47�
C. more than 47�
D. either more or less than 47�

Correct Answer

more than 47�

1. Assertion (A): A half wave controlled rectifier has poorer efficiency and higher ripple factor than a full wave controlled rectifier.
Reason (R): The use of a freewheeling diode in half wave controlled rectifier circuit improves the waveform of load current and circuit power factor.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

4. In a single phase full wave ac regulator using two thyristors only, the gate circuits of the two thyristors
Options
A. must be isolated
B. may or may not be isolated
C. should be preferably, isolated
D. should not be isolated

5. When a dc chopper feeds an RLE load, the load current, during steady state operation
Options
A. remains constant
B. varies between maximum and minimum values
C. may remain constant or vary
D. is constant if R is constant