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Total questions: 10
Worksheet time: 3mins
The weight of copper of both armature and field windings decreases with _________in number of poles.
Increase
Decrease
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
Yokes with rectangular cross-section are used for
Small capacity transformers
Medium capacity transformers
Large capacity transformers
Any of the above
The opposing property of a magnetic material is
Resistance
Reluctance
Reactance
Impedance
Write the unit of MMF
(a)
Window space factor is
Aw/Ac
Ac/Aw
Ai/Aw
Aw/Ai
The range of slot pitch for DC machine is
15 mm to 25 mm
25 mm to 35 mm
20mm to 30 mm
10mm to 15 mm
The crawling can be prevented by selecting the rotor slots of cage type is
10 - 20%
15-30%
0 -10%
5-15%
Use of damper winding in synchronous motor is
Damp out the osicillation
suppresses the negative sequence field
Start the motor
None of the above
