CARBOHYDRATE QUIZ

The core type transformer provides _______

Much longer magnetic path

Shorter magnetic path

None of the listed here

Lesser average length per turn

TRUE ANSWER : ?
YOUR ANSWER : ?

A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 . The load resistance as seen by the source is

7.8 Ω

1.3 Ω

13 Ω

78 Ω

TRUE ANSWER : ?
YOUR ANSWER : ?

Which type of winding is used in 3phase shell-type transformer?

Circular type

Sandwich type

Rectangular type

Cylindrical type

TRUE ANSWER : ?
YOUR ANSWER : ?

In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is

four times the primary current

one-fourth the primary current

equal to the primary current

one-fourth the primary current and equal to the primary current

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Either low or high voltage winding

High voltage winding

Low voltage winding

None of the listed here

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YOUR ANSWER : ?

Which of the following is not a part of transformer installation?

Exciter

Breather

Buchholz relay

Conservator

TRUE ANSWER : ?
YOUR ANSWER : ?

A common method of colling a power transformer is

Air blast cooling

Natural air cooling

Oil cooling

Any of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

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

0.2

0.4

5

25

TRUE ANSWER : ?
YOUR ANSWER : ?

Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is

great than one

approximately equal to one

None of these

less than one

TRUE ANSWER : ?
YOUR ANSWER : ?

In a transformer the energy is conveyed from primary to secondary

by the flux

through cooling coil

None of these

through air

TRUE ANSWER : ?
YOUR ANSWER : ?

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