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Electrical Machines

Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 0.08
 -0.08
 1.92
 -1.92

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 0.62.
 1.24.
 0.25.
 0.72.

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Electrical Machines
The shaft of induction motor should be

  any of these.
  hollow.
  flexible.
  stiff.

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 1500 rpm
 zero speed
 750rpm
 1000 rpm

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

 10 Hz.
  2 Hz.
  3 Hz.
 50 Hz.

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Electrical Machines
The frame of an induction motor is made of

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

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