Power Electronics Mcqs
Q.1: A Triac is a ______________?
A. 2 terminal switch
B. 2 terminal bilateral switch
C. 3 terminal bilateral switch
D. 3 terminal bidirectional switch
Q.2: A thyristor equivalent of a thyratron tube is a _________?:
A. Diac
B. Triac
C. Silicon controlled-rectifier SCR
D. None of above
Q.3: A silicon controlled racitifier (SCR) is a ____________?8
A. Unijunction device
B. Device with three junction
C. Device with four junction
D. None of the above
Q.4: A PNPN device having two gates is ___________?.
A. Diac
B. Triac
C. SUS
D. BCS
Q.5: A thyristor is basically________?!
A. PNPN device
B. A combination of diac and triac
C. A set of SCRs
D. A set if SCR,diac and triac
Q.6: A Triac has three terminals viz ___________?,
A. Drain, source, gate
B. Two main terminal and a gate terminal%
C. Cathode, anode, gate
D. None of the above
Q.7: An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be_____?l
A. 1500
B. 6000
C. 2121.32
D. 4242.64
Q.8: The typical value of SCR for modern alternator is____________?>
A. 1.5.
B. 0.5.
C. 1.0.
D. 1.2.
Q.9: An SCR is considered to be a semi controlled device because_______?C
A. it can be turned OFF but not ON with a gate pulse.2
B. it conducts only during one half cycle of an alternating current wave.F
C. it can be turned ON but not OFF with a gate pulse.2
D. it can be turned ON only during one half cycle of an A6
Q.10: A single phase full bridge inverter can operated in load commutation mode in case load consist of______?h
A. RL.
B. RLC underdamped.
C. RLC overdamped.
D. RLC critically damped

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