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Transformers

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

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

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Transformers
The efficiency of a transformer will be maximum when ______

None of the listed here
Leakage reactance of the two winding
Copper loss is equal to constant loss
Resistance of the two winding are equal

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Transformers
Power transformers are generally designed to have maximum efficiency around

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

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Transformers
The core type transformer is generally suitable for ______

None of the listed here
Low voltage and high output
High voltage and small output
High voltage and high output

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Transformers
Natural oil cooling is used for transformers upto a rating of

500 kVA
3000 kVA
1000 kVA
250 kVA

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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?

350
900
210
450

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