WorksheetsQUIZ2-EMD
Total questions: 10
Worksheet time: 5mins
Power transformers have rating
equal to 50 kVA
equal to 100 kVA
above 200 kVA
none of the above
The distance between the starts of two consecutive coils measured in terms of coil sides is called
front pitch
winding pitch
commutator pitch
back pitch
When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of
short pitch
full pitch
either of the above
none of the above
In induction motors, the length of air gap in kept as small as mechanically possible is order to have
low power factor
high power factor
high over load capacity
any of the above
Which of the following is the major consideration to evolve a good design ?
Cost
Durability
Compliance with performance criteria as laid down in specifications
All of the above
What are the parameters which come under the term “Main Dimensions”?
diameter
length
diameter and length
area
What is the range of the ratio of the core length to pole pitch for minimum cost?
1.5-2
1-2
1.0-1.25
2-2.5
What is the value of the ratio of the core length to pole pitch for good efficiency?
1
1.5
2
3
What is the relation between rotor mmf and stator mmf?
rotor mmf = 0.85 * stator mmf
rotor mmf = 0.80 * stator mmf
rotor mmf = 0.75 * stator mmf
rotor mmf = 0.70 * stator mmf
Closed slots are preferred for small machines.
true
false
