Electrical Engineering MCQs

Page No. 362

Which semiconductor device acts like a diode and two transistor?


a UJT


bDiac


cTriac


dSCR


View Answer Triac

Under over voltage condition impedance offered by the voltage clamping device is__________?


alow


bHigh


cmoderate


dinfinity


View Answer low

The latching current of GTO should be of order


a100 mA


b500 mA


c1 A


d2 A


View Answer 500 mA

The maximum di/dt in a SCR is____________?


aDirectly proportional to supply voltage


bDirectly proportional to inductance in the circuit


cInversely proportional to supply voltage


d Both A and B


View Answer Both A and B

Example of a voltage clamping device______________?


afast acting fuse


bsnubber circuit


cmetal oxide varistor


daluminium block


View Answer metal oxide varistor

Switching frequency of SITH is____________?


a5 KHz


b10 KHz


c60 KHz


d100 KHz


View Answer 100 KHz

Practical way of obtaining static voltage equalization in series connected SCRs is by the use of____________?


aOne resistor across the string


b Resistors of the same value across each SCR


cResistors of different values across each SCR


dOne resistor in series with each SCR



Thyristor can be protected from over voltages by using____________?


avoltage clamping device.


bfuse.


cheat sink.


dsnubber circuit.



Thyristor can be protected from over voltages by using


a23 mA.


b40 mA.


c10 mA.


d60 mA.


View Answer 10 mA.

A single phase full bridge inverter can operate in load commutation mode in case load consists of____________?


aRL.


bRLC underdamped.


cRLC overdamped.


dRLC critically damped.


View Answer RLC underdamped.

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