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# EE6604 Question Bank Design of Electrical Machines

## Sample EE6604 Question Bank:

1. Define transformation ratio.

It is defined as the ratio of secondary terminal voltage to primary terminal voltage.
It is denoted by k.
K = Vs /Vp = Ts / Tp = Ip / Is

2. Name the types of transformer.

Based upon construction, the types are
 Core type and
 shell type transformer
Based on applications, the types are
 Distribution transformers
 Power transformers
 Special transformers
 Instrument transformers
 Electronics transformers
Based on the type of connection, the types are
 Single phase transformer
 Three phase transformer
Based on the frequency range, the types are
 Power frequency transformer
 Audio frequency transformer
 UHF transformers
 Wide band transformers
 Narrow band transformer
 Pulse transformer
Based on the number of windings, the types are
 Auto transformer
 Two winding transformer

3. Define windows space factor or window area constant.

It is defined as the ratio of the are of copper in the window to the window area.
Kw = Ac / Aw < 1
Ac is the area of copper in m2
Aw is the area of window in m2

4. Define iron space factor.

It is defined as the ratio of gross core area to the area of the circumscribing circle.
Kis = Agi / Ace < 1
Agi is the gross core area in m2
Ace is the area of circumscribing circle in m2

5. What is a function of a transformer?

 It increases or decreases the voltage at same frequency.
 It transforms energy from one winding to other winding at constant frequency.
 It is used in electronic circuits with rectifying units to convert ac to dc.
 It provides isolation between to electrical circuits.

 Subject Name Design of Electrical Machines Subject Code EE6604 Regulation 2013