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Electrical Machines

Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 10 Hz.
 50 Hz.
  2 Hz.
  3 Hz.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt = Ea + Iara+ ILrs
 Vt= Ea– Iara
 Vt = Ea + Ia(ra + rs)
 Vt= Ea + Iara

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 4 KVA
 10 KVA
 0 KVA
 6 KVA

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

 1.5 %.
  less than 1 %.
 4 %.
  zero.

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to get saturated.
 In order to not to get saturated.
 In order to get more flux.
All of these

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

 Operating cost is less.
 Insulation requirement is less.
All of these
 Collecting of large current is simple.

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