Power Electronics Mcqs


Q.  Choppers is a_______________?

a. AC – DC converters
b. AC – AC converters
c. DC – AC converters
d. DC – DC converters


ANSWER: See Answer
 
No explanation is available for this question!
MCQs:  AC power in a load can be controlled by using____________?
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MCQs:  Number of PN junction in an SCR is____________?
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MCQs:  The switching function of semiconductor devices can be characterized with___________?
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MCQs:  IGBT stands for___________?
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MCQs:  Electrical power output in a d.c. generator is equal to____________?
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MCQs:  An ideal switch is___________?
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MCQs:  In ac – dc conversion, when the switch is closed then the sum of voltages around the loop is____________?
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MCQs:  If a shunt motor is started with its field winding open then?
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MCQs:  A rectifier with an external low pass filter is an example of______________?
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MCQs:  The power demand can be estimated approximately by___________?
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MCQs:  4 thyristors rated 200 V in series. The operating voltage of the string is 600 V. Derating factor of the string is_____________________?
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MCQs:  Unipolar modulation is generally used in____________?
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MCQs:  Dynamic equalizing circuit is used for________________?
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MCQs:  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___________?
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MCQs:  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______________________?
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MCQs:  Maximum di / dt in a SCR is________?
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MCQs:  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_____________?
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MCQs:  For series connected SCR’s dynamic equalising circuit consists of___________?
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MCQs:  By which one of the following we can measure the reliability of a string_____________?
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MCQs:  Anode current in an SCR consists of____________?
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