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JE 2019 || Day 18 || Transformers Quiz 3

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Question 1

A ideal transformer has 66 turns in the secondary. The number of primary turns is………………..

Question 2

A low-voltage outdoor lighting system uses a transformer that steps down to for safety. The equivalent resistance of all low-voltage lamps is What is the current in the secondary coil? Assume the transformer is ideal and there are no losses in the line.

Question 3

What is the efficiency of transformer compared with that of electrical motors of the same power?

Question 4

The inductive reactance of a transformer depends on

Question 5

Fig. shows the equivalent circuit of a practical transformer on no-load. The element accounts for…………………

Question 6

A single phase transformer has 400 primary and 1000 secondary turns. The net cross-sectional area of the core is If the primary is connected to source, what is the voltage induced in the secondary?

Question 7

A low-voltage outdoor lighting system uses a transformer that steps down to for safety. The equivalent resistance of all low-voltage lamps is Assume the transformer is ideal and there are no losses in the line. What is the current in the primary coil?

Question 8

An ideal transformer is one which…………..

Question 9

If the frequency of input voltage of a transformer is increased keeping the magnitude of the voltage unchanged, then

Question 10

The principle of operation of a 3-phase induction motor is most similar to that of a ___________.
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Apr 18ESE & GATE EE