A dc chopper is feeding an RLE load. The maximum steady state ripple is (Imax -

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Question
A dc chopper is feeding an RLE load. The maximum steady state ripple is
Options
A.
B.
C.
D.

Correct Answer

Explanation

(I_max - I_min)_max =

A dc chopper is feeding an RLE load. The maximum steady state ripple is (Imax - Imin)max = .

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2. 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

3. A thyristor is reverse biased. A positive gate pulse is applied. The thyristor
Options
A. will be turned on
B. may or may not turn on
C. will not turn on
D. will turn on after sometime

5. A static induction thyristor
Options
A. is a majority carrier device
B. is a minority carrier device
C. either a majority carrier or minority carrier device
D. has a total number of 2 leads

6. 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. 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.

9. 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

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