Electrostatic

61. In order to remove static electricity from machinery

1. construct insulated cabins
2. insulate the machinery
3. ground the framework
4. humidify the surroundings

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62. In the case of a lossy capacitor, its series equivalent resistance value will be

1. small
2. very small
3. large
4. zero

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63. is that property of a capacitor which delays any change of voltage across it.

1. Inductance
2. Capacitance
3. Potential gradient
4. None of the above

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64. Mica capacitors are characterised by all of the following except

1. stable operation
2. accurate value
3. low leakage reactance
4. low losses

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65. One volt is the same as

1. one joule/coulomb
2. one coulomb/joule
3. one coulomb
4. one joule

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66. Out of the following capacitors of identical rating which one will have the smallest dimensions?

1. Aluminium foil capacitor
2. Mica capacitor
3. Ceramic capacitor
4. Paper capacitor

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67. Paper capacitors usually have a tolerance of

1. ± 5%
2. ± 10%
3. ± 15%
4. ± 20%

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68. Paper condenser is

1. always polarised
2. usually of fixed value
3. electrolytic condenser
4. a variable condenser

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69. Permittivity is expressed in

1. Farad/sq-m
2. Farad/meter
3. Weber/meter
4. Weber/sq-m

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70. The ability of charged bodies to exert force on 6ne another is attributed to the existence of

1. electrons
2. protons
3. neutrons
4. electric field

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