Thyristor can be protected from over voltages by using:
A. 23 mA.
B. 40 mA.
C. 10 mA.
D. 60 mA.
The function of snubber circuit connected across the SCR is to:
A. Suppress dV / dt.
B. Increase dV / dt.
C. Decrease dV / dt.
D. Decrease di / dt.
If holding current of a thyristor is 2 mA then latching current should be:
A. 0.01 A.
B. 0.002 A.
C. 0.009 A.
D. 0.004 A.
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is:
A. 0.32
B. 0.67
C. 0.45
D. 0.27
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
The typical value of SCR for modern alternator is:
A. 1.5.
B. 0.5.
C. 1.0.
D. 1.2.
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
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
