Instrument Transformer

1.

Multiple Choice

30 sec

1 pt

A transformer is a passive electrical device that transfers _________________ between 2 or more circuits.

electrical energy

current

voltage

electromagnetic energy

2.

Multiple Choice

30 sec

1 pt

Electrical energy is transferred through ______________ in a transformer.

electric field

rotor

magnetic field

air space

3.

Multiple Choice

30 sec

1 pt

Primary winding of a transformer is determined by _________.

which winding has more turns

which winding is nearer to the load

which winding is connected to the source

which side has the highest voltage

4.

Multiple Choice

30 sec

1 pt

The diagram above refers to

Construction of transformer

Polarity of transformer

Schematic of transformer

Symbol of transformer

5.

Multiple Choice

30 sec

1 pt

What type of transformer is used to increase the voltage from power stations.

Step-down transformer

Step-up transformer

6.

Multiple Choice

30 sec

1 pt

Why transformers work with A.C. current but not D.C.

A.C current produces changing magnetic field.

D.C current produces changing magnetic field.

D.C current is weak

A.C current is powerful

7.

Multiple Choice

30 sec

1 pt

Which of the following does not change in a transformer?

Voltage

Current

Power

Frequency

8.

Multiple Choice

30 sec

1 pt

What is the material used for construction of transformer core?

Aluminium

Copper

Silicon steel

Wood

9.

Multiple Choice

30 sec

1 pt

Instrument transformers are used to ________________.

transform mechanical energy into electrical energy.

isolate or transform voltage or current levels.

transfer DC voltage from the primary winding to the secondary winding.

transfer DC current from the primary winding to the secondary winding.

10.

Multiple Choice

30 sec

1 pt

Which of the following is an instrument transformers?

Potential transformers

Current transformers

All of the above

None of the above

11.

Multiple Choice

30 sec

1 pt

What is a current transformer?

A transformer that is used with an A.C. ammeter

A transformer that is used with a D.C. ammeter

A transformer that is used with an A.C. voltmeter

A transformer that is used with a D.C. voltmeter

12.

Multiple Choice

30 sec

1 pt

What is a potential/voltage transformer?

A transformer that is used with an D.C. ammeter

A transformer that is used with an D.C. voltmeter

A transformer that is used with an A.C. ammeter

A transformer that is used with an A.C. voltmeter

13.

Multiple Choice

30 sec

1 pt

The primary winding of a C.T. has_________________.

no number of turns at all

a few number of turns

a large number of turns

14.

Multiple Choice

30 sec

1 pt

The secondary winding of a C.T. has__________________. It is connected in _____________ to an ammeter.

no number of turns at all, series

a few number of turns, parelel

a large number of turns, series

15.

Multiple Choice

30 sec

1 pt

The primary winding of a P.T. has ____________________.

no number of turns at all

a few number of turns

a large number of turns

16.

Multiple Choice

30 sec

1 pt

The secondary winding of a P.T. has ____________________. A low range voltmeter is connected in _____________ with the secondary winding.

no number of turns at all, series

a few number of turns, parelel

a large number of turns, series

17.

Multiple Choice

30 sec

1 pt

This picture is an example of a ________________.

Motor

Generator

Step-up transformer

Step-down transformer

18.

Multiple Choice

30 sec

1 pt

Ratio of voltages is equal to ratio of _______________________.

number of iron sheets in core

number of coil

number of turns in coil

number of electromagnetic

19.

Multiple Choice

30 sec

1 pt

A transformer has 100 turns in the primary coil and 25 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil?

480V

30V

20V

450V

20.

Multiple Choice

30 sec

1 pt

The potential transformers are used to measure large voltage using

High range voltmeter

Low range voltmeter

High range ammeter

Low range ammeter

Explore this activity with a free account