Current chopping leads to over voltage over current both over voltage and over c

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Correct Answer

over voltage

Explanation

e = L

Current chopping leads to over voltage over current both over voltage and over current either over v

. In current chopping

Current chopping leads to over voltage over current both over voltage and over current either over v

is high. Hence e is high.

Power Electronics problems

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1. 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

3. 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.

4. 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�

7. 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

8. In integral cycle control the period of on-off control should be more than mechanical time constant of load.
Options
A. True
B. False

9. Two semiconverters are connected in series to form a single phase series converter. The input v = V_m sin ?t and a₁ = a₂ are the firing angles of the two converters. If a₁ = a₂ = 0, the dc output voltage is
Options
A.
B.
C.
D.

10. In a 3 phase full wave regulator feeding a star connected resistance load the input voltage is 400 V line to line. The firing angle is 160�. The line to line output voltage would be
Options
A. 400 V
B. about 100 V
C. about 20 V
D. zero

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