Electrical Engineering MCQs

Page No. 194

In a capacitive circuit___________?


aa steady value of applied voltage causes discharge

✖


ban increase in applied voltage makes a capacitor charge

✓


cdecrease in applied voltage makes a capacitor charge

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d none of the above

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The dissipation factor of a good dielectric is of the order of____________?


a0.0002

✓


b0.002

✖


c0.02

✖


d0.2

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View Answer 0.0002

Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them_____________?


aall in series

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b all in parallel

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ctwo in parallel and third in series with this combination

✓


dtwo in series and third in parallel across this combination

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The sparking between two electrical contacts can be reduced by inserting a___________?


acapacitor in parallel with contacts

✓


bcapacitor in series with each contact

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cresistance in line

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dnone of the above

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Which of the following statements is incorrect _________________?


a The leakage resistance of ceramic capacitors is generally high

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bThe stored energy in a capacitor decreases with reduction in value of capacitance

✓


cThe stored energy in a capacitor increases with applied voltage

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d A wire cable has distributed capacitance between the conductors

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In the case of a lossy capacitor, its series equivalent resistance value will be_______________?


asmall

✖


bvery small

✖


clarge

✓


dzero

✖


View Answer large

Which of the following capacitors has relatively shorter shelf life____________?


aMica capacitor

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bElectrolytic capacitor

✓


cCeramic capacitor

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dPaper capacitor

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Which of the following expression is correct for electric field strength___________?


aE = D/E

✓


b E = D2/t

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cE = jtD

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dE= nD2

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View Answer E = D/E

Which of the following statement is true __________?


aThe current in the discharging capacitor grows linearly

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bThe current in the dicharging capacitor grows exponentially

✓


cThe current in the discharging capacitor decays exponentially

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d The current in the discharging capacitor decreases constantly

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Which of the following materials has the highest value of dielectric constant___________?


aGlass

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bVacuum

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cCeramics

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dOil

✓


View Answer Oil

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