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To protect most of the electrical equipment handling low power, the types of relays used are

None of these
Thermocouple
Electronic and bimetallic
Both of the listed here

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A fuse in a motor circuit provides protection against

short-circuit and overload
None of these
overload
open circuit, short-circuit and overload

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Wave trap is used to trap waves of

either of the above
None of these
power frequencies
higher frequencies entering generator or transformer units

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SF6 gas

None of these
has pungent small
is yellow in colour
is lighter than air
is nontoxic

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Overheating of relay contacts or contact born out is due to

all of these
foreign matter on the contact surface
too low contact pressure
slow making and breaking of load circuit contacts

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