SSC JE Electrical 2019 with solution SET-1
 Which of the following is the correct relation regarding coupled coils?

M > (L1L2)0.5
M = (L1 + L2)/2
M = (L1 − L2)/2
M ≤ (L1L2)0.5

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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 protect the motor from overloading
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

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SSC JE Electrical 2019 with solution SET-1
 What would the total loss of the 2kVA transformer corresponding to maximum efficiency be, provided the transformer has the iron of 150 W and full-load copper loss of 250W?

400 W
500 W
100 W
300 W

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