Electrical Engineering MCQs

Page No. 189

The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to _________ percent of its value


a37, initial

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b 62, initial

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c 62, final

✓


d37, final

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View Answer 62, final

Dielectric strength of a material depends on_____________?


amoisture content

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btemperature

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c thickness

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dall of the above

✓


View Answer all of the above

1 volt/meter is same as___________?


a 1 meter/coulomb

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b 1 newton meter

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c1 newton/meter

✓


d1 joule/coulomb

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View Answer 1 newton/meter

The bridge used for the measurement of the value of the capacitance is____________?


aWien’s bridge

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bWheatstone bridge

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c Schering bridge

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dHay’s bridge

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View Answer Schering bridge

The capacitance between two plates increases with____________?


ashorter plate area and higher applied voltage

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b shorter plate area and shorter distance between them

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clarger plate area, longer distance between plates and higher,applied voltage

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dlarger plate area and shorter distance between plates

✓



If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________?


a charged

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bshort-circuited

✓


clossy

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dsatisfactory

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View Answer short-circuited

The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by__________?


aCIR

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b1/RC

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cRC

✓


dRIC

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View Answer RC

Mica capacitors are characterized by all of the following except___________?


astable operation

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b accurate value

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clow leakage reactance

✓


dlow losses

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View Answer low leakage reactance

An uncharged conductor is placed near a charged conductor, then_____________?


athe uncharged conductor gets charged by conduction

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b the uncharged conductor gets charged by induction and then attracted towards the charging body

✓


cthe uncharged conductor is attracted first and then charged by induction

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d it remains as such

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Paper condenser is___________?


aalways polarised

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b usually of fixed value

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celectrolytic condenser

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da variable condenser

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