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Switch Gear

Switch Gear
SF 6 gas

Is nontoxic
is lighter than air
is yellow in colour
has pungent small

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Switch Gear
Admittance relay is

impedance relay
non-directional relay
None of these
directional relay

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Switch Gear
Which of the following is the least expensive protection for over current is low voltage system ?

air break circuit breaker
rewireable fuse
oil circuit breaker
isolator

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Switch Gear
The pick-up current of a relay is 7.5 A and the fault current in relay is 30 A. Its plug-setting multiplier (P.S.M.) is

4
2
8
6

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

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

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Switch Gear
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
None of these
insulate the contacts from switch body
All of these
extinguish the arc

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