Electrical Engineering MCQs

Page No. 361

Which of following devices has highest di/dt and dv/dt capability?


aSIT


bSITH


cGTO


dSCR


View Answer GTO

Which triggering is the most reliable____________?


aForward voltage triggering


bGate triggering


cdV / dt triggering


dThermal triggering


View Answer Gate triggering

Leakage current flows through the thyristor in_________?


a forward blocking mode


breverse blocking mode


c both forward and reverse blocking mode


dforward conduction mode



Which of the following is disadvantage of fast recovery diodes?


aRecovery is only 5 µs


bRecovery is only 50 µs


cDoping is carried out


dNone of these


View Answer Doping is carried out

When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ___________?


aCB


bSnubber circuit


cVoltage clamping device


dFast acting current limiting device (FACL fuse)



A power semiconductor may undergo damage due to____________?


aHigh di/dt


bHigh dv/dt


cLow di/dt


dLow dv/dt


View Answer High di/dt

CB used for over current protection of thyristor operates when the fault current is__________?


aof long period


bof short duration


cboth (A) and (B)


dneither (A) nor (B)


View Answer of long period

If the anode current is 800 A, then the amount of current required to turn off the GTO is about____________?


a20 A


b200 A


c600 A


d400 A


View Answer 200 A

What is used to protect the SCR from over current ________________?


aCB and fuse.


bHeat sink.


cSnubber circuit.


dVoltage clamping device.


View Answer CB and fuse.

Under normal operating condition voltage clamping device offers impedance of_________?


ahigh value.


blow value.


czero value.


dmoderate value.


View Answer high value.

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