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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

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

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Transformers
Power transformers are generally designed to have maximum efficiency around

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

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Transformers
The maximum efficiency of a distribution transformer is

at 80% full load
at 50% full load
at no load
at full load

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Transformers
Which of the following protection is normally not provided on small distribution transformers?

Overcurrent protection
Buchholz relay
All of these
Overfluxing protection

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Transformers
What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?

0.25 kVA
16 kVA
4 kVA
8 kVA

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