Electrostatic

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

1. 50 pF
2. 100 pF
3. 150 pF
4. 200 pF

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112. What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it?

1. It will become magnetic
2. It will melt
3. It will get punctured or cracked
4. Its molecular structure will get changed

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

1. 2 joules
2. 4 joules
3. 6 joules
4. 8 joules

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114. When a dielectric is placed in an electric field the field strength

1. decreases
2. increases
3. reduces to zero
4. remain unchanged

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115. When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will

1. remain uncharged
2. decrease
3. increase
4. become zero

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116. When the dielectric is homogeneous,the potential gradient is

1. uniform
2. non-uniform
3. zero
4. any of the above

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117. Which capacitor will be physically smaller for the same ratings?

1. Ceramic capacitor
2. Paper capacitor
3. Both will be of equal size
4. None of the above

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118. Which is the most superior dielectric out of the following?

1. Air
2. Glass
3. Bakelite
4. Paper

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119. Which medium has the least dielectric strength?

1. Paraffin wax
2. Quartz
3. Glass
4. Air

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120. Which of the following capacitor is preferred in case of single phase motor?

1. Mica capacitor
2. Paper capacitor
3. Electrolytic capacitor
4. Ceramic capacitor

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