EIE Quiz 1 (Activity 2)

For a transformer copper losses are also known as

• variable loss

• iron loss

• eddy current loss

• losses in shunt parameter

The magnetic material for the core needs to be made of soft iron where its permeability is high

• to reduce eddy current loss

• to reduce hysteresis loss

• to avoid fringing in the core

• to reduce copper loss in the winding

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

Transformer is a device which transforms A.C electric power of one circuit to another , keeping the _______ same.

• Voltage

• Current

• Frequency

Laminated insulation are normally used in the transformer:

• To reduce the hysteresis effect

• To increase the hysteresis effect

• To reduce the effect of eddy current

• To increase the effect of eddy current

If dc voltage is applied to the primary of a transformer it may:

• Work

• Burn the winding

• Give lower voltage on the secondary side

• Give higher voltage on the secondary side

Transformer ratings are usually expressed in terms of :

• Voltage

• KVA

• kWh

• KW

In _________ Transformer Losses are Zero.

• Practical

• Ideal

• Isolation

• Auto

What is the material used for construction of transformer core?

• Aluminium

• Copper

• Iron

• Wood

Efficiency of a transformer is

• (output current)/(input current) x100%

• (output voltage)/(input voltage) x100%

• (output loss)/(input loss) x100%

• (output power)/(input power) x100%