Top 250+ Solved Power Electronics MCQ Questions Answer
Q. In an SCR, the anode current consists of
a. only holes
b. only electrons
c. both electrons and holes
d. either electrons or holes
Q. A 3 phase semiconverter when supplying a certain load has a rectification efficiency of 0.6 and transformer utilisation factor of 0.35. When a 3 phase full converter is supplying the same load
a. rectification efficiency will be more than 0.6 and TUF will be more than 0.35
b. rectification efficiency will be more than 0.6 but TUF will be less than 0.35
c. rectification efficiency will be less than 0.6 and TUF will be less than 0.35
d. rectification efficiency will be less than 0.6 but TUF will be more than 0.35
Q. Natural commutation can be used in :
a. DC circuits only
b. AC circuits only
c. both AC and DC circuits
d. none of the above
Q. In a thyristor the gate lead is connected to the n layer near the p layer to which anode is connected.
a. True
b. False
c. none
d. all
Q. McMurray Bedford full bridge inverter uses
a. natural commutation
b. auxiliary commutation
c. complementary commutation
d. any of the above
Q. Which of these commutation methods uses an external pulse for commutation?
a. Class A
b. Class C
c. Class E
d. Class F
Q. A single phase full converter can operate in
a. 4 quadrants
b. 3 quadrants
c. 2 quadrants
d. 1 quadrant
Q. In a 3 phase semiconverter, the freewheeling diode comes into operation only if firing angle
a. is zero
b. is 60°
c. is more than 60°
d. is more than 90°