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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 1500 rpm
 zero
 30 rpm
 1470 rpm

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 both increase
 decrease and increase respectively
 both decrease
 increase and decrease respectively

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Electrical Machines
Which of the following motor has negative speed regulation?

 Differential compound motor
 Shunt motor
 Series motor
 Cumulative compound motors

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Armature.
 Brush.
 Yoke.
  Commutator.

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

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Electrical Machines
Hysteresis loss will depends on

 f³
 f
 f²
 f1.6

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