Free Printable Ch3 Quiz: Transformers (Part 3a)

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Ch3 Quiz: Transformers (Part 3a)

Total questions: 20

Worksheet time: 10mins

Name

Class

Date

What is the main function of a transformer?

Convert AC to DC

Change the level of AC voltage

Increase frequency

Store electrical energy

A transformer works based on which field interaction?

Electric field

Magnetic field

Gravitational field

Static field

The winding connected to the power source is called:

Secondary winding

Auxiliary winding

Primary winding

Field winding

Increasing the number of turns in a winding will:

Reduce voltage

Increase voltage

Reduce current frequency

Increase core loss

The transformer core is usually made of:

Copper

Aluminium

Ferromagnetic material

Carbon

Which law states that the induced emf is proportional to rate of change of flux?

Ohm's Law

Lenz's Law

Faraday's Law

Coulomb's Law

Flux produced in the transformer that links both windings is called:

Leakage flux

Useful flux

Mutual flux

Excitation flux

Which statement is TRUE for an ideal transformer?

It has copper losses

It has no flux leakage

It has finite permeability

It has hysteresis loss

In an ideal transformer, the input power equals:

Zero

Twice the output power

Output power

Primary voltage only

10.

If the turn ratio $a=N_1/N_2<1$ , the transformer is:

Step-up

Step-down

Auto-transformer

DC converter

11.

The current ratio in an ideal transformer is given by:

$I_1/I_2=N_1/N_2$

$I_1 I_2=0$

$I_1/I_2=N_2/N_1$

$I_1=I_2$

12.

Which parameter remains the same in both primary and secondary of an ideal transformer?

Voltage magnitude

Current magnitude

Power factor

Impedance

13.

Impedance referred from secondary to primary is multiplied by:

$a$

$a^2$

$1/a$

$1/a^2$

14.

Leakage flux in practical transformers is caused by:

Infinite permeability

Core saturation

Flux not linking both windings

Zero resistance windings

15.

Which is NOT a type of transformer loss?

Eddy current loss

Hysteresis loss

Copper loss

Capacitor loss

16.

The excitation branch in a practical transformer consists of:

Winding resistance only

Core loss and magnetising reactance

Leakage reactance only

Load resistance

17.

The induced emf equation in rms form is:

$E=4.44 f N \varphi_{\max}$

$E=IR$

$E=V/I$

$E=f/(N\,\varphi)$

18.

Copper losses occur in which component?

Core

Air gap

Primary and secondary windings

Support frame

19.

In practical transformers, winding resistance causes:

Hysteresis loss

Flux leakage

Voltage drop

Frequency change

20.

Shell-type and core-type refer to:

Materials used in windings

Arrangement of transformer core

Load characteristics

Transformer efficiency

Reset

Ch3 Quiz: Transformers (Part 3a)

Total questions: 20

Worksheet time: 10mins

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