Electrical Engineering MCQs

Page No. 185

Energy stored in the electric field of a capacitor C when charged from a D.C source of voltage V is equal to joules_______________?


aCV2

✓


bC2V

✖


cCV2

✖


d CV

✖


View Answer CV2

When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of_____________?


a 2 joules

✖


b4 joules

✖


c6 joules

✖


d8 joules

✓


View Answer 8 joules

Dielectric constant for mica is nearly_____________?


a 200

✖


b100

✖


c3 to 8

✓


d1 to 2

✖


View Answer 3 to 8

What is the value of capacitance that must be connected in parallel with 50 pF condenser to make an equivalent capacitance of 150 pF ?


a50 pF

✖


b100 pF

✓


c150 pF

✖


d200 pF

✖


View Answer 100 pF

The capacitor preferred for high frequency circuits is_____________?


aair capacitor

✖


bmica capacitor

✓


c electrolytic capacitor

✖


dnone of the above

✖


View Answer mica capacitor

If a 6 uF capacitor is charged to 200 V, the charge in coulombs will be____________?


a800 uC

✖


b900 uC

✖


c1200 uC

✓


d1600 uC

✖


View Answer 1200 uC

Which of the following material has least value of dielectric constant ?


aCeramics

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b Oil

✓


c Glass

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dPaper

✖


View Answer Oil

For closer tolerances which of the following capacitors is usually preferred ?


a Paper capacitor

✖


bMica capacitor

✓


cCeramic disc capacitor

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dNone of the above

✖


View Answer Mica capacitor

Paper capacitors usually have a tolerance of___________?


a± 5%

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b± 10%

✓


c± 15%

✖


d± 20%

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View Answer ± 10%

“The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface”. The above statement is associated with_______?


aGauss’s law

✓


b Kirchhoff s law

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cFaraday’s law

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dLenz’s law

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View Answer Gauss’s law

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