Electrical Engineering MCQs

Page No. 363

The function of snubber circuit connected across the SCR is to___________?


aSuppress dV / dt.


bIncrease dV / dt.


cDecrease dV / dt.


dDecrease di / dt.


View Answer Suppress dV / 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_____?


a111.9 Ω.


b11.19 Ω.


c108 Ω.


d115 Ω


View Answer 111.9 Ω.

In forward blocking mode of a thyristor________?


ajunction J2 is in reverse bias and J1, J3 is in forward bias.


bjunction J3 is in forward bias and J1, J2 is in reverse bias.


cJunction J1, J3 is in reverse bias and J2 is in forward bias.


dJunction J1 and J2 is in forward bias and J3 is in reverse bias.



In reverse blocking mode of a thyristor______?


ajunction J2 is in reverse bias and J1, J3 is in forward bias.


bjunction J3 is in forward bias and J1, J2 in reverse bias.


cjunction J1, J3 is in reverse bias and J2 is in forward bias.


djunction J1 and J2 is in forward bias and J3 is in reverse bias.



If holding current of a thyristor is 2 mA then latching current should be_____?


a0.01 A.


b0.002 A.


c0.009 A.


d0.004 A.


View Answer 0.004 A.

Which statement is true for latching current ___________?


aIt is related to turn off process of the device.


bIt is related to conduction process of device.


cIt is related to turn on process of the device.


dBoth C and D.



A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is_____?


a0.32


b0.67


c0.45


d0.27


View Answer 0.27

A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is _____?


a30° to 150°.


b30° to 180°.


c60° to 120°.


d60° to 180°.


View Answer 30° to 150°.

A single phase full bridge inverter can operated in load commutation mode in case load consist of______?


aRL.


bRLC underdamped.


cRLC overdamped.


dRLC critically damped


View Answer RLC underdamped.

An SCR is considered to be a semi controlled device because_______?


ait can be turned OFF but not ON with a gate pulse.


bit conducts only during one half cycle of an alternating current wave.


cit can be turned ON but not OFF with a gate pulse.


dit can be turned ON only during one half cycle of an AC.



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