A. as static conductor
B. for power control
C. for speed control of dc shunt motor
D. All of these
Related Mcqs:
- The turn-on time of an SCR with inductive load is 20 µs. The puls train frequency is 2.5 KHz with a mark/space ratio of 1/10, then SCR will___________?
A. Turn on
B. Not turn on
C. Turn on if inductance is removed
D. Turn on if pulse frequency us increased to two times - A silicon controlled racitifier (SCR) is a ____________?
A. Unijunction device
B. Device with three junction
C. Device with four junction
D. None of the above - 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. - For an SCR gate – cathode characteristic is a straight line of 130. For triggered source volume of 15 V and allowable gate power dissipation of 0.5 W compute the gate source resistance_____?
A. 111.9 Ω.
B. 11.19 Ω.
C. 108 Ω.
D. 115 Ω - The maximum di/dt in a SCR is____________?
A. Directly proportional to supply voltage
B. Directly proportional to inductance in the circuit
C. Inversely proportional to supply voltage
D. Both A and B - What is used to protect the SCR from over current ________________?
A. CB and fuse.
B. Heat sink.
C. Snubber circuit.
D. Voltage clamping device. - ON state voltage drop across SCR lie between the range_____________?
A. 0 – 0.5 V.
B. 0.5 – 1 V.
C. 1 – 1.5 V.
D. 1.5 – 2 V. - Anode current in an SCR consists of____________?
A. holes only
B. electrons only
C. either electron or holes
D. Both electron and holes - With gate open, the maximum anode current at which SCR is turned off from ON condition is called____________?
A. breakdown voltage
B. peak reverse voltage
C. holding current
D. latching current - An SCR is made up of silicon because_____________?
A. silicon has large leakage current than germanium
B. silicon has small leakage current than germanium
C. silicon has small leakage voltage than germanium
D. silicon has large leakage voltage than germanium
