SSC JE Electrical 2019 with solution SET-1
 Which of the following lamps has the shortest/less life span in working hours?

Incandescent lamp
Mercury vapor lamp
Sodium vapor lamp
Fluorescent lamp

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SSC JE Electrical 2019 with solution SET-1
 In the full-wave rectifier circuit shown in the figure, the diodes that conduct when the positive half-wave of AC signal applied are

D3, D4
D2, D3
D4, D1
D1, D2

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

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SSC JE Electrical 2019 with solution SET-1
 If an alternator is operating at unity power factor, then its terminal voltage is

Greater than the induced EMF, with negative voltage regulation
Equal to the induced EMF, with zero voltage regulation
Less than the induced EMF, with positive voltage regulation
Less than the induced EMF, with negative regulation

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