1) At the instant of contact separation in asymmetrical tests, the dc component is
a. Equal to the ac component
b. Equal to the 50% of ac component
c. Greater than 50% of the ac component
d. Less than the 50% of the ac component
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Answer
Explanation
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ANSWER: Greater than 50% of the ac component
Explanation:
No explanation is available for this question!
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2) Failure during switching impulse tests are can be determined by
a. Visible in oscillograms
b. Loud noise produced
c. External flashovers
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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3) For the measurement of radio interference voltages, the detector circuit is provided with a measuring device to measure
a. Average value
b. Peak value
c. Quasi-peak value
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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4) For operating power frequency voltages, a surge arrester has to be a
a. Conductor
b. Non-conductor
c. Semiconductor
d. None of these
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Answer
Explanation
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ANSWER: Non-conductor
Explanation:
No explanation is available for this question!
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5) Impulse testing of transformers is done using
a. Full wave standard impulse
b. Chopped wave standard impulse
c. Half wave standard impulse
d. Only (a) and (b)
e. None of these
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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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6) The expected life at the rated stress can be determined by conducting long duration life tests at increased stress for
a. Less than 1 hr
b. 1 hr to about 1000 hr
c. More than 1000 hr
d. None of these
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Answer
Explanation
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ANSWER: 1 hr to about 1000 hr
Explanation:
No explanation is available for this question!
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7) In routine tests, the cable is tested by applying an ac voltage of
a. 2 times the rated value
b. 2.5 times the rated value
c. 3 times the rated value
d. 3.5 times the rated value
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Answer
Explanation
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ANSWER: 2.5 times the rated value
Explanation:
No explanation is available for this question!
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8) While performing temperature rise tests, at any part of the bushing the steady temperature rise above the ambient air temperature should not exceed
a. 20 °C
b. 25 °C
c. 35 °C
d. 45 °C
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Answer
Explanation
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ANSWER: 45 °C
Explanation:
No explanation is available for this question!
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9) The tests which is not performed under power frequency tests is
a. Partial discharge tests
b. Momentary withstand test
c. Visible discharge tests
d. Full wave withstand tests
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Answer
Explanation
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ANSWER: Full wave withstand tests
Explanation:
No explanation is available for this question!
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10) The voltage which produces the loss of dielectric strength of insulation is known as
a. Withstand voltage
b. Disruptive discharge voltage
c. Flashover voltage
d. Impulse voltage
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Answer
Explanation
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ANSWER: Disruptive discharge voltage
Explanation:
No explanation is available for this question!
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