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21. 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
22. An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be_____?
A. 1500 A.
B. 6000 A.
C. 2121.32 A.
D. 4242.64 A.
23. The typical value of SCR for modern alternator is____________?
A. 1.5.
B. 0.5.
C. 1.0.
D. 1.2.
24. An SCR is considered to be a semi controlled device because_______?
A. it can be turned OFF but not ON with a gate pulse.
B. it conducts only during one half cycle of an alternating current wave.
C. it can be turned ON but not OFF with a gate pulse.
D. it can be turned ON only during one half cycle of an AC.
25. A single phase full bridge inverter can operated in load commutation mode in case load consist of______?
A. RL.
B. RLC underdamped.
C. RLC overdamped.
D. RLC critically damped
26. A Triac is a ______________?
A. 2 terminal switch
B. 2 terminal bilateral switch
C. 3 terminal bilateral switch
D. 3 terminal bidirectional switch
27. A thyristor equivalent of a thyratron tube is a _________?
A. Diac
B. Triac
C. Silicon controlled-rectifier SCR
D. None of above
28. A silicon controlled racitifier (SCR) is a ____________?
A. Uni junction device
B. Device with three junction
C. Device with four junction
D. None of the above
29. A PNPN device having two gates is ___________?
A. Diac
B. Triac
C. SUS
D. BCS
30. 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