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Electrical Machines

Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 25 Hz.
 Zero Hz.
 100 Hz.
 50 Hz.

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Electrical Machines
Breadth factor is defined as the ratio of

 emf with distributed winding to emf with concentrated winding.
 emf with concentrated winding to emf with distributed winding.
None of these
 both 1 and 2.

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  continue running in the same direction as before.
  run in a direction opposite to previous one.
  get damaged.
  not run.

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

None of these
 Synchronous speed
 Zero
 Slip speed

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Electrical Machines
The frame of an induction motor is made of

  closed grained cast iron.
  aluminium.
  silicon steel.
  stainless steel.

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 0.98
 0.04, 1.96
 0.04, 0.96
 0.02, 1.98

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