Top 250+ Solved Power Electronics MCQ Questions Answer
Q. A semiconverter feeding an RLE load operates in
a. first quadrant only
b. first and second quadrants
c. first and fourth quadrants
d. first and third quadrants
Q. The phenomenon of overlap in converter operation due to
a. source resistance
b. source inductance
c. both source resistance and source inductance
d. high value of firing angle
Q. An SCR is triggered at 40° in the positive half cycle only. The average anode current is 50 A. If the firing angle is changed to 80°, the average anode current is likely to be
a. 50 A
b. 25 A
c. less than 50 A but more than 25 A
d. less than 25 A
Q. In a single phase full wave regulator, the firing angles in the positive and negative half cycles are generally
a. Equal
b. Different
c. equal or different
d. different but sometimes equal
Q. Current derating may be necessary when thyristors areoperating in
a. Series
b. Parallel
c. series or parallel
d. none of the above
Q. The terminals of a power MOSFET are called
a. emitter, base, collector
b. source, gate, drain
c. source, base, drain
d. emitter, gate, drain
Q. In a thyristor the gate current is increased, then
a. anode current will increase
b. anode current will decrease
c. anode current will remain constant
d. anode current may increase or decrease
Q. Assertion (A): A TRIAC is a bidirectional SCR.Reason (R): A TRIAC is a four layers 3 terminal device and can conduct in both directions.
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
Q. A single phase full wave regulator feeds R-L load. The best gating signal is
a. short duration pulses
b. long duration pulses
c. pulse train
d. either (a) or (b)