Electrical Engineering MCQs

Page No. 356

A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be_____________?


a5, 7


b 4, 6


c 7, 5


d6, 4


View Answer 7, 5

For series connected SCR’s dynamic equalising circuit consists of___________?


aR and C in series but with diode across C


bR and C in series but with diode across R


c Series R and diode with C across R


dSeries R and diode with C across R



By which one of the following we can measure the reliability of a string_____________?


aString efficient


bReliability factor


c Factor of safety


dDerating factor


View Answer Derating factor

Anode current in an SCR consists of____________?


a holes only


belectrons only


ceither electron or holes


dBoth electron and holes


View Answer holes only

To meet high current demand we use SCRs in______________?


aseries connection.


b parallel connection.


canti parallel connection.


dboth B and C.



Dynamic equalising circuit is useful____________?


aTo limit di / dt of SCR


bTo limit dV / dt of SCR


cFor voltage equalisation


d Both B and C


View Answer Both B and C

SCRs are used in series to meet_______________?


ahigh current demand


blow voltage demand


c low current demand


dhigh voltage demand



Which following is a two terminal three layer device?


a BJT


b Power dioed


cMOSFET


dNone of above


View Answer None of above

ON state voltage drop across SCR lie between the range_____________?


a0 – 0.5 V


b 0.5 – 1 V


c1 – 1.5 V


d1.5 – 2 V


View Answer 1 – 1.5 V

Which of following is not a power transistor?


aIGBTs


b COOLMOS


cTRIAC


dSITS


View Answer TRIAC

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