1) The Townsend mechanism explains the phenomenon of breakdown
a. Only at low pressure
b. Only at high pressure
c. Only at very high pressure
d. Only bat very low pressure
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Answer
Explanation
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ANSWER: Only at low pressure
Explanation:
No explanation is available for this question!
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2) Formative time lag depends on the mechanism of the avalanche growth in gap. The formative time lag is usually
a. Much shorter than the statistical time lag
b. Much greater than the statistical time lag
c. Equal to the statistical time lag
d. None of these
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Answer
Explanation
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ANSWER: Much shorter than the statistical time lag
Explanation:
No explanation is available for this question!
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3) Field in case of rod gaps and sphere gaps are
a. Uniform, uniform
b. Uniform, non-uniform
c. Non-uniform, uniform
d. Non-uniform, non-uniform
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Answer
Explanation
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ANSWER: Non-uniform, uniform
Explanation:
No explanation is available for this question!
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4) For the high voltage conductors at high pressures, if the voltage is positive then the corona appears as a
a. Uniform bluish white sheath
b. Reddish glowing spots
c. Uniform greenish spots
d. None of these
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Answer
Explanation
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ANSWER: Uniform bluish white sheath
Explanation:
No explanation is available for this question!
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5) According to the Paschen’s Law, the breakdown voltage of a uniform field gap is
a. Directly proportional to the gas pressure and inversely proportional to the electrode gap
b. Inversely proportional to the gas pressure and directly proportional to the electrode gap
c. Directly proportional to the both electrode gap and gas pressure
d. Inversely proportional to the both electrode gap and gas pressure
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Answer
Explanation
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ANSWER: Directly proportional to the both electrode gap and gas pressure
Explanation:
No explanation is available for this question!
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6) The statistical time lag depends upon the
a. Size of gap
b. Quantity of radiation that produces the primary electrons
c. Amount of pre-ionization preset gap
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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7) A gas in normal state is almost a perfect
a. Conductor
b. Insulator
c. Semi-conductor
d. Dielectric
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Answer
Explanation
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ANSWER: Insulator
Explanation:
No explanation is available for this question!
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8) Druyesteynian distribution applies when the ion energy is much
a. Greater than the thermal energy
b. Lesser than the thermal energy
c. Equal to the thermal energy
d. None of these
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Answer
Explanation
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ANSWER: Greater than the thermal energy
Explanation:
No explanation is available for this question!
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9) Inelastic collisions are those in which internal changes in energy take place within an atom or a molecule at the expenses of total kinetic energy of the colliding particle. Suitable example for inelastic collisions is/are
a. Ionization
b. Attachment
c. Excitation
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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10) Which theory explains the mechanism for breakdown under different conditions?
a. Townsend theory
b. Streamer theory
c. Clump theory
d. Only (a) and (b)
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Answer
Explanation
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ANSWER: Only (a) and (b)
Explanation:
No explanation is available for this question!
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