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Breaking capacity of a circuit breaker is usually expressed in terms of
amperes
volts
MVA
Mw
amperes
volts
MVA
Mw
Answer
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Insulation resistance of high voltage circuit breakers is more than
10 mega ohms
500 mega ohms
1 mega ohms
100 mega ohms
10 mega ohms
500 mega ohms
1 mega ohms
100 mega ohms
Answer
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Back up protection is generally used for protection against
short-circuit faults only
open-circuit faults only
both open and short-circuit faults
None of these
short-circuit faults only
open-circuit faults only
both open and short-circuit faults
None of these
Answer
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Interruption of large currents by relay requires
all of these
high speed opening of contacts
arc suppressing blow out coils
wide separation of the opened contacts
all of these
high speed opening of contacts
arc suppressing blow out coils
wide separation of the opened contacts
Answer
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The fuse wire, in D.C. circuits, is inserted in
none of the listed here
Both of the listed here
negative circuit only
positive circuit only
none of the listed here
Both of the listed here
negative circuit only
positive circuit only
Answer
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SF6 gas
is nontoxic
is lighter than air
None of these
has pungent small
is yellow in colour
is nontoxic
is lighter than air
None of these
has pungent small
is yellow in colour
Answer
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