In the circuit of figure, the waveshape of load current when thyristor conductin

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Question
In the circuit of figure, the waveshape of load current when thyristor conducting is
Options
A. constant
B. increasing exponentially
C. decreasing exponentially
D. either (b) or (c)

Correct Answer

increasing exponentially

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2. Assertion (A): A transistor has lower voltage drop during conduction as compared to thyristor
Reason (R): Transistors are manufactured in very high voltage and current ratings.
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 integral cycle control of ac regulators, the period of integral cycle control, i.e., (m + n) T should be
Options
A. less than mechanical or thermal time constant of the system
B. more than the mechanical or thermal time constant of the system
C. more or less than the mechanical or thermal time constant
D. very high

5. Assertion (A): Typical value of thermal resistance from source to sink of an SCR is about 0.3� C/W
Reason (R): Heat sinks of thyristors are generally made of aluminium.
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

10. A separately excited dc motor is run from a dc source through a chopper. At 600 rpm and rated torque, the duty cycle of chopper is 0.8. At 600 rpm and half the rated torque, the duty cycle is likely to be
Options
A. 0.9
B. 0.8
C. 0.75
D. 0.6

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