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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
(Ns-l)s

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Transformers
In the short circuit test on a transformer, we generally short circuit ______

High voltage winding
Low voltage winding
None of the listed here
Either low or high voltage winding

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Transformers
A common method of colling a power transformer is

Natural air cooling
Any of the listed here
Oil cooling
Air blast cooling

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Transformers
Which of the following transformer is smallest?

2kVA, 400 Hz
2kVA, 500 Hz
2kVA, 50 Hz
2kVA, 200 Hz

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Transformers
Open circuit test on transformers is conducted to determine

core losses
copper losses
eddy current losses
hysteresis losses

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Transformers
The primary coil of a transformer is connected to a 60 V ac source. The secondary coil is connected to a 330 load. The turns ratio is 3:1. What is the secondary voltage?

2 V
18 V
180 V
20 V

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