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Transformers

Transformers
Noise level test in a transformer is a

special test
routine test
type test
None of these

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Transformers
Short circuit test on transformers is conducted to determine

hysteresis losses
core losses
copper losses
eddy current losses

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Transformers
Which motor is preferred for use in mines where explosive gases exist?

Synchronous motor
Air motor
Shunt motor
Induction motor

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Transformers
The mutual inductance when k = 0.65, L1 = 2 H, and L2 = 5 H is

2 mH
4 μH
2 μH
8 μH

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Transformers
The no load ratio of a 50 Hz single phase transformer is 6000/250 V. The maximum flux in the core is 0.06 Wb. What is the number of primary turns?

900
350
210
450

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Transformers
The leakage flux in a transformer depends upon

load current and voltage
load current
load current, voltage, frequency and power factor
load current, voltage and frequency

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