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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

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

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Transformers
Burden of a current transformer is usually expressed in

Volts
Volt amperes
Amperes
Kilowatt

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Transformers
By laminating the core of a transformer, we decrease _____

Leakage reactance
Copper loss
Hysteresis loss
Eddy current loss

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Transformers
A shell-type transformer has

reduced magnetic leakage
negligibly hysteresis losses
high eddy current losses
None of these

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Transformers
The steel used for transformer core has

All of the listed here
High silicon content
High permeability
Low hysteresis loss

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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
210
450
900

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