ELECTROSTATIC AND CAPACITANCE QUIZ

Paper capacitors usually have a tolerance of

± 15%

± 5%

None of the listed here

± 10%

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The capacitance between two plates increases with

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

shorter plate area and higher applied voltage

shorter plate area and shorter distance between them

larger plate area and shorter distance between plates

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Mica capacitors are characterised by all of the following except

low leakage reactance

stable operation

low losses

accurate value

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Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant ?

300 times

150 times

50 times

100 times

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Dielectric strength of a medium is usually expressed in

C/mm

N/mm

None of the listed here

KV/mm

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In a cable capacitor, voltage gradient is maximum at the surface of the

Insulator

Earth

Sheath

Conduction

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

4 joules

8 joules

6 joules

2 joules

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Capacitors are used for audio frequency and radio frequency coupling and tuning

Paper

Air

Ceramic

Mica

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Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is

1.76 x 1015 m/s2

1.6 x 1015 m/s2

1.5 x 1015 m/s2

0.56 x 1015 m/s2

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

two in parallel and third in series with this combination

two in series and third in parallel across this combination

all in series

all in parallel

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