Which of the following is correct for a BJT?

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Question
Which of the following is correct for a BJT?
Options
A.
B.
C.
D.

Correct Answer

Power Electronics problems

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1. As compared to a p-n junction diode
Options
A. a schottky diode has lower cut in voltage and lower reverse saturation current
B. a schottky diode has higher cut in voltage and higher reverse saturation current
C. a Schottky diode has lower cut in voltage and higher reverse saturation current
D. a schottky diode has higher cut in voltage and lower reverse saturation current

2. In disc mounting of SCR
Options
A. SCR is clamped on one side of disc shaped heat sink
B. SCR is clamped between two disc shaped heat sinks
C. The SCR has low current rating
D. None of the above

3. When a single phase dual converter is operating in circulating current mode
Options
A. both converters are working as rectifiers simultaneously
B. one converter is always working as rectifier and the other as inverter
C. only one converter is working at one time
D. both converters are either working as rectifiers or as inverters simultaneously

5. Forward rating of an SCR is
Options
A. the maximum rate of rise of anode voltage which will trigger the SCR
B. the maximum rate of rise of anode voltage which will not trigger the SCR if gate signal is applied
C. the maximum rate of rise of anode voltage which will not trigger the SCR if gate signal is not applied
D. either (b) or (c)

7. Assertion (A): A class C chopper can operate in first and second quadrants
Reason (R): A class B chopper operates only in second quadrant.
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. A single phase dual converter consists of
Options
A. two fully controlled converters connected in parallel
B. two fully controlled converters connected in antiparallel
C. two fully controlled semiconverters connected in antiparallel
D. two fully controlled semiconverters connected in parallel

10. In a single phase half wave ac regulator feeding a resistive load, the rms load current
Options
A. is always positive
B. may be positive or negative
C. is always negative
D. can be even zero

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