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Switch Gear

Switch Gear
The relay operating coil is supplied through

None of these
current transformer
power transformer
fuse

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Switch Gear
The rated secondary current of current transformer for relays is generally

30 A
20 A
5 A
10 A

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Back up protection is generally used for protection against

open-circuit faults only
both open and short-circuit faults
None of these
short-circuit faults only

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When transmission line is energized, the wave that propagates on it is

current wave only
voltage wave only
power factor wave only
both current wave and voltage wave

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Switch Gear
The relay operating speed depends upon

the rate of flux built up
the spring tension
All of these
armature core air gap

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Switch Gear
Overheating of relay contacts or contact born out is due to

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

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