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

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Transformers
Power transformers are generally designed to have maximum efficiency around

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

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Transformers
The maximum efficiency of a distribution transformer is

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

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

Buchholz relay
All of these
Overfluxing protection
Overcurrent 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?

4 kVA
8 kVA
16 kVA
0.25 kVA

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