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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  0.54.
  1.
 0.7.
 0.3.

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 2, 4
 1, 4
 2, 3
 1, 3

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Electrical Machines
Which of the following statements is/are correct ?

None of these
 Inter pole winding will act in interpolar region.
 Compensating winding will act under the pole.
 Both A and B.

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Field control.
 Multiple voltage control.
 Ward-Leonard control.
 Armature control.

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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, 0.96
 0.04, 1.96
 0.02, 1.98

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Electrical Machines
In DC machine torque depends on which of the following?

 both A and B
 speed
 flux (φ)
 armature current (I)

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