Switchgear protections

2. Arc in a circuit breaker is interrupted at

zero current
maximum current
minimum voltage
maximum voltage

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448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube
href="https://exam.pscnotes.com/mcq/arc-in-a-circuit-breaker-is-interrupted-at/#more-59750">Detailed SolutionArc in a circuit breaker is interrupted at

3. The relay with inverse time characteristic will operate within

1.5 sec
5 to 10 sec
5 to 20 sec
20 to 30 sec E. none of the above

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64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube
inverse time characteristic will operate within" class="read-more button" href="https://exam.pscnotes.com/mcq/the-relay-with-inverse-time-characteristic-will-operate-within/#more-59748">Detailed SolutionThe relay with inverse time characteristic will operate within

4. Which of the following circuit breakers has high reliability and minimum maintenance ?

Air blast circuit breakers
Circuit breaker with SF6 gas
Vacuum circuit breakers
Oil circuit breakers

Detailed SolutionWhich of

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the following circuit breakers has high reliability and minimum maintenance ?

5. The interaction between a transmission line and communication line is minimized by

transposing transmission as well as communication lines
increasing the height of the trans-mission line tower
increasing the distance between the two lines
all of the above

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line and communication line is minimized by" class="read-more button" href="https://exam.pscnotes.com/mcq/the-interaction-between-a-transmission-line-and-communication-line-is-minimized-by/#more-59536">Detailed SolutionThe interaction between a transmission line and communication line is minimized by

6. Oil switches are employed for

low currents circuits
low voltages circuits
high voltages and large currents circuits
all circuits

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288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube for" class="read-more button" href="https://exam.pscnotes.com/mcq/oil-switches-are-employed-for/#more-59482">Detailed SolutionOil switches are employed for

7. Which of the following devices will receive voltage surge first travelling on the transmission line ?

Lightning arresters
Relays
Step-down transformer
Switchgear

Detailed SolutionWhich of the following

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devices will receive voltage surge first travelling on the transmission line ?

8. For cost and safety, the outdoor substations are installed for voltages above

11 kV
33 kV
60 kV
110 kV

Detailed SolutionFor cost

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and safety, the outdoor substations are installed for voltages above

9. An efficient and a well designed protective relaying should have

good selectivity and reliability
economy and simplicity
high speed and selectivity
all of the above

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well designed protective relaying should have" class="read-more button" href="https://exam.pscnotes.com/mcq/an-efficient-and-a-well-designed-protective-relaying-should-have/#more-58499">Detailed SolutionAn efficient and a well designed protective relaying should have

10. On which of the following effects of electric current a fuse operates?

Photoelectric effect
Electrostatic effect
Heating effect
Magnetic effect

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button" href="https://exam.pscnotes.com/mcq/on-which-of-the-following-effects-of-electric-current-a-fuse-operates/#more-58110">Detailed SolutionOn which of the following effects of electric current a fuse operates?
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