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Air blast circuit breakers for 400 kV power system are designed to operate in
0.1 sec
100 micro-second
50 milli-second
0.5 sec
0.1 sec
100 micro-second
50 milli-second
0.5 sec
Answer
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Related Question
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The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to
lubricate the contacts
All of these
insulate the contacts from switch body
None of these
extinguish the arc
lubricate the contacts
All of these
insulate the contacts from switch body
None of these
extinguish the arc
Answer
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When a fault occur in a power system, the circuit breaker
is opened by remote control
opens automatically
is opened manually
None of these
is opened by remote control
opens automatically
is opened manually
None of these
Answer
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To protect most of the electrical equipment handling low power, the types of relays used are
Both of the listed here
Thermocouple
None of these
Electronic and bimetallic
Both of the listed here
Thermocouple
None of these
Electronic and bimetallic
Answer
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Outdoor switchgear is generally used for voltage beyond
66 kV
132 kV
33 kV
11 kV
66 kV
132 kV
33 kV
11 kV
Answer
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Back up protection is generally used for protection against
None of these
both open and short-circuit faults
short-circuit faults only
open-circuit faults only
None of these
both open and short-circuit faults
short-circuit faults only
open-circuit faults only
Answer
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