A single phase full converter gives maximum and minimum output voltage at firing

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Question
A single phase full converter gives maximum and minimum output voltage at firing angles of
Options
A. 0 and 180� respectively
B. 180� and 0� respectively
C. 0 and 90� respectively
D. 90� and 0� respectively

Correct Answer

0 and 180� respectively

Explanation

Output voltage is maximum if a = 0 and is minimum if a = 180�.

Power Electronics problems

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1. In controlled heating circuits, thyristors act as
Options
A. rectifier
B. inverter
C. ac regulator
D. chopper

3. In a single phase full bridge converter (B - 2 connection), the input voltage is v = V_m sin ?t. The output dc voltage for resistive load
Options
A.
B.
C.
D.

4. A single phase electric heater uses phase controlled thyristors. The firing angle is 90�. The degree of heating is
Options
A. 25% of maximum
B. 50% of maximum
C. 75% of maximum
D. none of the above

6. A Shockley diode can be used
Options
A. in place of SCR
B. as a trigger switch for SCR
C. in place of UJT
D. both in place of SCR and as a trigger switch for SCR

7. As regards single phase dual converter
Options
A. the change in operation from one quadrant to the other is faster in non-circulating current mode
B. the change in operation from one quadrant to the other is faster in circulating current mode
C. the time response to change in operation from one quadrant to other is the same in both the modes
D. the time response to change in operation from one quadrant to the other may be faster in any of the two modes

8. In a parallel inverter
Options
A. the commutating capacitor C is across the primary of transformer and the load is across the secondary
B. the commutating capacitor and load are connected across the secondary of transformer
C. the commutating capacitor C and load are connected in series and the combination is across the secondary of transformer
D. none of the above

9. In a fully controlled bridge converter feeding a resistive load the waveshapes of output voltage and output current
Options
A. are always similar
B. can never be similar
C. may be similar or dissimilar
D. are similar only if a = 0

10. Assertion (A): Snubber circuit has an RC series circuit in parallel with SCR
Reason (R): Voltage across a capacitor can not change instantaneously.
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

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