A single phase half wave converter is feeding a resistive load. Just before trig

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Question
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

Correct Answer

same as input voltage

Explanation

Before triggering the whole of applied voltage is across SCR and load current is zero.

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2. 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.

3. 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�

8. 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

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

10. 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.

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