Transformers

Question 1

In a double wound transformer the resistance is

Answer 1

Infinite

Question 2

Laminations of transformer cores are generally made of:

Answer 2

Silicone Steel

Question 3

The path for the magnetic flux in a transformer should have:

Answer 3

Low reluctance

Question 4

In a transformer the primary winding is connected to:

Answer 4

An AC power source

Question 5

If the primary voltage is larger than the secondary voltage, the transformer is called:

Answer 5

Step-down transformer

Question 6

If the primary voltage is smaller than the secondary voltage, the transformer is called:

Answer 6

Step-up transformer

Question 7

Transformer laminations are insulated from each other by:

Answer 7

Thin Coat of varnish

Question 8

In a double wound transformer, alternating current is induced in:

Answer 8

In the secondary winding

Question 9

How are transformers rated?

Answer 9

VA

Question 10

In an ideal transformer:

Answer 10

The windings have no resistance
(b) The core has no losses
(c) All the flux links both windings

Question 11

Which of the following parts of a large power transformer are visible from outside the transformer?

Answer 11

Bushings

Question 12

The part of a transformer which is most subject to damage from overheating is:

Answer 12

The winding insulation

Question 13

A bell transformer is a:

Answer 13

Step down Transformer

Question 14

In a transformer the primary flux is always ___________ the secondary flux.

Answer 14

Greater than

Question 15

What will happen if the primary winding of a transformer is connected to a D.C supply?

Answer 15

Transformer may start to smoke and burn out