A semiconverter feeding an RLE load operates in first quadrant only first and se

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Question
A semiconverter feeding an RLE load operates in
Options
A. first quadrant only
B. first and second quadrants
C. first and fourth quadrants
D. first and third quadrants

Correct Answer

first quadrant only

Explanation

Semiconvertor operates only in first quadrant.

Power Electronics problems

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1. A single phase semiconverter is feeding a highly inductive load and has freewheeling diode across the load. The waveshapes of output voltage and output current
Options
A. are similar
B. are not similar
C. may be similar or dissimilar
D. are similar only if firing angle is zero

2. The phenomenon of overlap in converter operation due to
Options
A. source resistance
B. source inductance
C. both source resistance and source inductance
D. high value of firing angle

3. Assertion (A): A transistor requires a continuous base signal for conduction but a thyristor requires a gate pulse.
Reason (R): Transistor find widespread application in power electronic circuits.
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

4. Current derating may be necessary when thyristors are operating in
Options
A. series
B. parallel
C. series or parallel
D. none of the above

6. Assertion (A): Inverters and choppers use fast switching thyristors
Reason (R): Fast switching SCR has low turn off time.
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. The terminals of a power BJT are called
Options
A. emitter, base, collector
B. emitter, base, drain
C. source, base, drain
D. source, base, collector

9. In a single phase full wave converter (M - 2 connection) feeding a highly inductive load, the firing angle for each thyristor is a in the respective half cycle. The period of conduction of each thyristor is
Options
A. p - a
B. p
C. p + a
D. p - 2a

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