Specifications

62
QUESTIONS
Part - A
Choose the Correct Answer (1 Mark)
1. In single layer winding, the number of coil is equal to ____________, so that each slots
contains only one coil side.
A) the number of slots on the stator B) the number of poles
C) synchronous speed D) half the number of slots on the stator
2. Pole pitch is defined as
A) number of slots per pole B) number of slots per pole phase
C) coil sides per slot D) coil groups per phase
3. For a 2 pole ac machine having 12 slots, the angle between consecutive slots, â is 30
0
, and
if the first phase, say R or A phase starts at slot no.1, the Y or C phase should start at
A) 9 B) 3 C) 7 D) 5
4. In mush winding, the coil groups are connected in such a manner that their emfs
A) become 1 B) add C) subtract D) become zero
5. For full pitch winding, angle between the two sides of the same coil is
A) 90
0
ε B) 60
0
ε C) 180
0
ε D) 120
0
ε
Part - B
Answer the following questions in one or two words (1 Mark)
1. When the number of coil is equal to half the number of slots on the stator, such that each
slots contains only one coil side. What is this type of winding called?
2. For full pitch winding, what should be the angle between the two sides of the same coil?
3. For short pitch winding, should the angle between the two sides of the same coil be 180
0
ε?
4. What should be the winding sequence in a three phase winding?
5. Write the formulae for finding the angle between the adjacent slots.