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Transformers

Transformers
Which of the following parts of a transformer is visible from outside?

Core
Primary winding
Secondary winding
Bushings

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Transformers
In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be

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

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

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

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Transformers
The core type transformer is generally suitable for ______

None of the listed here
High voltage and high output
Low voltage and high output
High voltage and small output

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Transformers
To step 110 V ac down to 20 V ac, the turns ratio must be

0.018
5.5
18
0.18

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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?

20 V
180 V
18 V
2 V

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