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Transformers

Transformers
Which of the following is not a fitting on a transformer?

Buchholz's relay
Breather
Commutator
Conservator

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Transformers
Power transformers are generally designed to have maximum efficiency around

10% overload
near full-load
half-load
no-load

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Transformers
Which of the following acts as a protection against high voltage surges due to lightning and switching?

Horn gaps
Breather
Thermal overload relays
Conservator

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Transformers
In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be

(Ns-l)s
(l-s)Ns
s.N.
Ns

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Transformers
When load on a transformer is increased, the eddy current _____

None of the listed here
Is increased
Is decreased
Remains unchanged

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

2 μH
2 mH
8 μH
4 μH

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