In a single phase full wave regulator feeding R-L load, the minimum firing angle

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Question
In a single phase full wave regulator feeding R-L load, the minimum firing angle can be zero.
Options
A. True
B. False

Correct Answer

True

Explanation

Range of control of a is 0 ? a ? p.

Power Electronics problems

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1. In a single phase full wave converter (M - 2 connection), the rms transformer voltage is 300 V across each half of secondary. The PIV for each thyristor is
Options
A. 300 V
B.
C. 6002 V
D.

2. In a 3 phase full wave regulator feeding resistance load connected in star, the possible range of firing angle a is
Options
A. 0 ? a ? 180�
B. 0 ? a ? 150�
C. 0 ? a ? 120�
D. 0 ? a ? 90�

5. In a 3 phase full converter the average load current is 150 A. The average thyristor current is
Options
A. 150 A
B. 75A
C. 50 A
D. 25 A

6. A single phase half wave converter is feeding a resistive load. Just before triggering, the voltage across thyristor is
Options
A. zero
B. about 1 V
C. same as input voltage
D. twice the input voltage

9. Assertion (A): The gate current of an SCR is always in the form of pulses.
Reason (R): The gate losses, in pulse triggering, are low.
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. In integral cycle control the period of on-off control should be more than mechanical time constant of load.
Options
A. True
B. False

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