Free Printable quiz tx

1.

Transformer is....

a)

a magnetic field device

b)

transfer electrical energy from one circuit to another

c)

transfer power from source to load

2.

How many type of core?

a)

1

b)

2

c)

3

3.

What are 3 main parts of transformer?

a)

primary, secondary windings and core

b)

primary and secondary windings

c)

ac source, windings and load

4.

How to find transformer ratio?

a)

E1/E2

b)

R1/R2

c)

V1/V2

5.

This figure is..

a)

approximate eq cct

b)

exact eq cct

c)

practical tx eq cct

6.

this cct referred to..

a)

primary side

b)

secondary side

7.

This figure shows phasor diagram of..

a)

unity power factor

b)

lagging power factor

c)

leading power factor

8.

the main purpose of short cct test is to find...

a)

Req and Xeq

b)

Rc and Xm

9.

find Rc, Xm,

a)

Rc = 240

Xm = j33.7

b)

Rc = 18.5

Xm = j132

c)

Rc = 2.38

Xm = j3.09

10.

resistive heating losses in the core of the tx known as....

a)

copper losses

b)

hysterisis lossess

c)

eddy current losses

d)

leakage flux

11.

ideal tx....

a)

high lossess

b)

zero losses

c)

low efficiency

12.

if the tx circuit is referred to primary side, thus impedance at secondary side should....

a)

x $a^2$

b)

÷ $a^2$

13.

efficiency equation for approximate equivalent cct is...

a)

$\frac{nSpf}{nSpf+nP_{Rc}+P_{Req}}$

b)

$\frac{nSpf}{nSpf+n^2P_{Rc}+P_{Req}}$

c)

$\frac{nSpf}{nSpf+n^2P_{Req}+P_{Rc}}$

14.

characteristic of shell type

a)

2 limbs

b)

shorter length of iron core

quiz tx

Total questions: 14

Worksheet time: 20mins

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