Electrostatic

71. The absolute permittivity of free space is given by

1. 8.854 x 1(T9 F/m)
2. 8.854 x 1(T10 F/m)
3. 8.854 x KT11 F/m
4. 8.854 x 10″12 F/m

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72. The bridge used for the measurement of the value of the capacitance is

1. Wien's bridge
2. Wheatstone bridge
3. Schering bridge
4. Hay's bridge

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73. The capacitance between two plates increases with

1. shorter plate area and higher applied voltage
2. shorter plate area and shorter distance between them
3. larger plate area, longer distance between plates and higher,applied voltage
4. larger plate area and shorter distance between plates

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

1. CIR
2. 1/RC
3. RC
4. RIC

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75. The capacitance of a capacitor is not affected by

1. distance between plates
2. area of plates
3. thickness of plates
4. all of the above

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76. The capacitor preferred for high frequency circuits is

1. air capacitor
2. mica capacitor
3. electrolytic capacitor
4. none of the above

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77. The capacity of capacitor bank used in power factor correction is expressed in terms of

1. kW
2. kVA
3. kVAR
4. volts

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78. The dielectric constant (relative permittivity) of glass is given by

1. 0.1 to 0.4
2. 0.5 to 1.0
3. 2.0 to 4.0
4. 5 to 100

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79. The direction of electric field due +0 positive charge is .

1. away from the charge
2. towards the charge
3. both (a) and (6)
4. none of the above

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80. The dissipation factor of a good dielectric is of the order of

1. 0.0002
2. 0.002
3. 0.02
4. 0.2

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