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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
Electronic and bimetallic
None of these
Thermocouple
Both of the listed here
Electronic and bimetallic
None of these
Thermocouple
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In a circuit breaker the time duration from the instant of the fault to extinction of arc is known as
lead time
lag time
clearing time
operation time
lead time
lag time
clearing time
operation time
Answer
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SF6 gas
is yellow in colour
None of these
is nontoxic
is lighter than air
has pungent small
is yellow in colour
None of these
is nontoxic
is lighter than air
has pungent small
Answer
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For which of the following protection from negative sequence currents is provided ?
Transmission line
Transformers
Motors
Generators
Transmission line
Transformers
Motors
Generators
Answer
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Which of the following is the least expensive protection for over current is low voltage system ?
rewireable fuse
isolator
air break circuit breaker
oil circuit breaker
rewireable fuse
isolator
air break circuit breaker
oil circuit breaker
Answer
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A fuse in a motor circuit provides protection against
short-circuit and overload
overload
None of these
open circuit, short-circuit and overload
short-circuit and overload
overload
None of these
open circuit, short-circuit and overload
Answer
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