Free Printable transformer

1.

This picture is an example of a ________________.

a)

Motor

b)

Generator

c)

Step-up transformer

d)

Step-down transformer

2.

Which of the following does not change in a transformer?

a)

Voltage

b)

Current

c)

Frequency

3.

The winding which is connected to the supply side is called the ....... winding.

a)

primary

b)

secondary

c)

tertiary

4.

Which one is not the condition for ideal transformer.

a)

Resistance of primary and secondary winding must be zero

b)

Leakage flux must be zero.

c)

Permeability must be zero.

d)

core losses must be zero

5.

define form factor

a)

$\frac{rms\ value}{average\ value}$ for sine wave form factor =1.11

b)

$\frac{average\ value}{rms\ value}$ for sine wave form factor =1.11

6.

definition of cycle (read the options carefully)

a)

one complete set of positive and negative values of alternating quantity

b)

one complete set of positive or negative values of alternating quantity

7.

Relation between time period, T and frequency,f

a)

$T=\frac{1}{f}$

b)

T=f

8.

Transformer works on the principle of

a)

mutual induction

b)

self induction

c)

superposition theorem

9.

select voltage transformation ratio of trasnformer

a)

$\frac{E_2}{E_1}=\frac{N_2}{N_1}=k$

b)

$\frac{E_2}{E_1}=\frac{N_1}{N_2}=k$

10.

select emf equation of transformer

a)

$rms\ value\ of\ induced\ emf\ E=4.44fN\phi_m$

b)

$average\ value\ of\ induced\ emf\ E=4.44fN\phi_m$

c)

$rms\ value\ of\ induced\ emf\ E=4.44fNB_m$

transformer

Total questions: 10

Worksheet time: 10mins

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