1) The increase in liquid hydrostatic pressure
a. Increases the breakdown strength
b. Decreases the breakdown strength
c. Does not affect the breakdown strength
d. None of these
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Answer
Explanation
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ANSWER: Increases the breakdown strength
Explanation:
No explanation is available for this question!
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2) According to the Stressed Oil Volume theory, the breakdown strength is
a. Directly proportional to the stressed oil volume
b. Directly proportional to the square of the stressed oil volume
c. Inversely proportional to the stressed oil volume
d. None of these
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Answer
Explanation
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ANSWER: Inversely proportional to the stressed oil volume
Explanation:
No explanation is available for this question!
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3) According to the Bubble theory, once a bubble is formed, it will elongate in the direction of electric field under the influence of electrostatic forces. During elongation the volume of bubbles
a. Increases
b. Decreases
c. Remains constant
d. None of these
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Answer
Explanation
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ANSWER: Remains constant
Explanation:
No explanation is available for this question!
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4) In case of solid particles present in the liquid and in case of presence of only gas bubbles in liquids, the direction of force is towards
a. Areas of maximum stress, areas of minimum stress
b. Areas of maximum stress, areas of maximum stress
c. Areas of minimum stress, areas of maximum stress
d. Areas of minimum stress, areas of minimum stress
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Answer
Explanation
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ANSWER: Areas of maximum stress, areas of minimum stress
Explanation:
No explanation is available for this question!
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5) In Breakdown tests, the tests voltages required for these tests are usually of the order of
a. 0 – 10 kV
b. 20 – 50 kV
c. 50 – 100 kV
d. 100 – 200 kV
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Answer
Explanation
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ANSWER: 50 – 100 kV
Explanation:
No explanation is available for this question!
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6) In equipments filled with liquid dielectric, heat is transferred mainly by
a. Conduction
b. Convection
c. Radiation
d. No heat transfers takes place
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Answer
Explanation
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ANSWER: Convection
Explanation:
No explanation is available for this question!
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7) Compared to copper and iron losses, dielectric loss in transformer oil is
a. Negligible
b. Equal
c. High
d. Very high
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Answer
Explanation
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ANSWER: Negligible
Explanation:
No explanation is available for this question!
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8) High temperature hydrocarbons have
a. Higher boiling point and low viscosity
b. Lower boiling point and high viscosity
c. Lower boiling point and low viscosity
d. Higher boiling point and high viscosity
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Answer
Explanation
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ANSWER: Higher boiling point and high viscosity
Explanation:
No explanation is available for this question!
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9) For applications in power cables, the dielectrics most commonly used is
a. Polyolefins
b. Mineral oil
c. Benzene
d. Diphenyl
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Answer
Explanation
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ANSWER: Polyolefins
Explanation:
No explanation is available for this question!
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10) Liquids dielectrics are mainly used as
a. Impregnants in high voltage cables
b. In capacitors
c. For filling up transformers
d. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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