Electrical Engineering MCQs

Page No. 355

In ac – dc conversion, when the switch is closed then the sum of voltages around the loop is____________?


aZero


bNon zero


cEqual to the sum of voltage when switch is open


d Twice of the voltage when switch is open


View Answer Non zero

A rectifier with an external low pass filter is an example of______________?


a Indirect switch matrix circuits


bDirect switch matrix circuits


c Embedded converters


dAll of these



What is the advantage of HRC fuses over Rewirable fuses?


aHigh speed operation


bHigh rupturing capacity


cNo ageing effect


dAll of the above


View Answer All of the above

The power demand can be estimated approximately by___________?


aLoad survey method


bMathematical method


cStatistical method


dEconomic parameters


View Answer Statistical method

4 thyristors rated 200 V in series. The operating voltage of the string is 600 V. Derating factor of the string is_____________________?


a0.75


b0.7


c0.2


d0.25


View Answer 0.25

Unipolar modulation is generally used in____________?


aAC – AC converters


b AC – DC converters


cDC – AC converters


d DC – DC converters



Dynamic equalizing circuit is used for________________?


a equal division of voltage across each thyristor


bequal division of current through each thyristor in parallel


c equal division of voltage across each thyristor in parallel


dequal division of current through each thyristor in series



A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. value of n will be___________?


a 60


b 70


c80


d90


View Answer 80

60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is______________________?


a 76.3 %


b91.6 %


c 83.3 %


d90.9 %


View Answer 76.3 %

Maximum di / dt in a SCR is________?


aDirectly proportional to Vm of supply voltage


b Inversely proportional to Vm of supply voltage


c Inversely proportional to L in the circuit


d Both A and C



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