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Transformers

Transformers
The noise produced by a transformer is termed as

zoom
buzz
hum
ringing

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Transformers
An ideal transformer is one which _______

None of the listed here
Does not work
Has no losses and leakage reactance
Has same number of primary and secondary turns

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Transformers
The no load primary current is about ______of full load primary current.

3-5%
30-40%
15-30%
Above 40%

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Transformers
How are transformers generally cooled for installations rated at less than 5kVA ?

None of the listed here
Oil cooled
Air cooled
Water cooled

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Transformers
A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is

0.2
5
0.4
25

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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?

180 V
20 V
18 V
2 V

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