EASY

Earn 100

Hysteresis loss can be minimised by selecting a material for the core that has (low/high)hysteresis coefficient.

50% studentsanswered this correctly

Important Questions on Alternating Current

EASY

Physics>Electricity and Magnetism>Alternating Current>Transformer

A transformer is used to light a

100 W,

110 V

lamp from a

220 V

supply. If the supply current is

0.6 A,

the efficiency of the transformer is

EASY

Physics>Electricity and Magnetism>Alternating Current>Transformer

An ideal transformer has $500$ and $5000$ turn in primary and secondary windings, respectively. If the primary voltage is connected to a $6 V$ DC battery, then the secondary voltage is:

EASY

Physics>Electricity and Magnetism>Alternating Current>Transformer

Which of the following remain constant in a transformer ?

MEDIUM

Physics>Electricity and Magnetism>Alternating Current>Transformer

An ideal transformer converts

220 V

AC to

3.3 kV

AC. It transmits the power of

4.4 kW

. If the primary coil has

600

turns, then alternating current in the secondary coil is

EASY

Physics>Electricity and Magnetism>Alternating Current>Transformer

A power transmission line feeds input power at

2300 V

to a step-down transformer with its primary windings having

4000

turns giving the output power at

230 V

. If the current in the primary coil of the transformer is

5 A

and its efficiency is

90 %

, the output current would be:

EASY

Physics>Electricity and Magnetism>Alternating Current>Transformer

What is the phenomenon involved in the working of transformer ?

MEDIUM

Physics>Electricity and Magnetism>Alternating Current>Transformer

A step-up transformer operates on a

230 V

line and a load current of

2 A

. The ratio of primary and secondary windings is

1 : 25

. Then the current in the primary is

EASY

Physics>Electricity and Magnetism>Alternating Current>Transformer

In an Indian laboratory, a circuit running on low AC voltage is connected to the AC mains through an electrical device .Name the electrical device

MEDIUM

Physics>Electricity and Magnetism>Alternating Current>Transformer

A transformer consisting of

300

turns in the primary and

150

turns in the secondary gives output power of

2.2 k W

. If the current in the secondary coil is

10 A

, then the input voltage and current in the primary coil are:

MEDIUM

Physics>Electricity and Magnetism>Alternating Current>Transformer

A transformer having efficiency of

90 %

is working on

200 V

and

3 k W

power supply. If the current in the secondary coil is

6 A

the voltage across the secondary coil and the current in the primary coil respectively are:

EASY

Physics>Electricity and Magnetism>Alternating Current>Transformer

A step-down transformer has turn ratio

20 : 1

. If

8 V

is applied across

0.4 Ω

secondary then the primary current will be

EASY

Physics>Electricity and Magnetism>Alternating Current>Transformer

The number of turns in the primary of an ideal transformer is $400$ and that in the secondary is $2000$ . If the output power from the secondary at $1000 V$ is $10 kW$ then calculate the voltage and current in the primary coil.

EASY

Physics>Electricity and Magnetism>Alternating Current>Transformer

For the given circuit, comment on the type of transformer used :

Question Image

EASY

Physics>Electricity and Magnetism>Alternating Current>Transformer

A common transistor radio set requires

12 V

(D . C .)

for its operation. The

D . C .

source is constructed by using a transformer and a rectifier circuit, which are operated at

220 V

(A . C .)

on standard domestic

A . C .

supply. The number of turns of secondary coil are

24,

then the number of turns of primary are

EASY

Physics>Electricity and Magnetism>Alternating Current>Transformer

In an Indian laboratory, a circuit running on low AC voltage is connected to the AC mains through an electrical device .If the electrical device is 100% efficient, state whether its input current will be greater or less than the output current.

HARD

Physics>Electricity and Magnetism>Alternating Current>Transformer

What is a transformer? Describe the principle, construction and working method of a transformer.

MEDIUM

Physics>Electricity and Magnetism>Alternating Current>Transformer

What is Transformer? Draw its labelled diagram.

EASY

Physics>Electricity and Magnetism>Alternating Current>Transformer

A current of

6 A

is flowing at

220 V

in the primary coil of a transformer. If the voltage produced in the secondary coil is

1100 V

and

40 %

of power is lost, then the current in the secondary coil will be:

EASY

Physics>Electricity and Magnetism>Alternating Current>Transformer

A power transmission line feeds input power at

2300 V

to a step down transformer with its primary windings having

4000

turns. The output power is delivered at

230 V

by the transformer. If the current in the primary of the transformer is

5 A

and its efficiency is

90 %

, the output current would be:

MEDIUM

Physics>Electricity and Magnetism>Alternating Current>Transformer

A power transmission line feeds input power at

2300 V

to a stepdown transformer with its primary windings having

4000

turns. What should be the number of turns in the secondary windings in order to get output power at

230 V

Hysteresis loss can be minimised by selecting a material for the core that has (low/high)hysteresis coefficient.

Important Questions on Alternating Current

Learn and Prepare for any exam you want !