SSC JE Electrical 2019 with solution SET-1
 A single-phase circuit’s power factor can be measured with a/an

Wattmeter alone
Combination of a voltmeter and ammeter
Energy meter alone
Combination of a voltmeter, ammeter, and wattmeter

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SSC JE Electrical 2019 with solution SET-1
 The laws involved in the expression e  = −dφ/dt are

Faraday’s and Ampere’s laws
Coulomb’s and Ampere’s laws
Coulomb’s and Faraday’s laws
Faraday’s and Lenz’s laws

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SSC JE Electrical 2019 with solution SET-1
 Lamp efficiency is measured in

Lumen/watt
Lumen/lux
Lux/watt
Candela/watt

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SSC JE Electrical 2019 with solution SET-1
 What is the reason behind using a centrifugal switch in a single-phase induction motor?

To cut-off the starting winding at an appropriate instant
To out in the capacitor during running conditions
To protect the motor from overloading
To improve the starting performance of the motor

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