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Electrical Machines

Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 16.
 8.
  4.
 32.

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Electrical Machines
A series motor is efficiently suitable for

  high starting torque operation.
 constant speed operation.
 none of these.
 low starting torque operation.

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 DC Shunt Motor
  The motor will attain dangerously high speed.
 The speed of motor will be reduced.
 The armature current will reduce.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 not changed
 increase
None of these
 decrease

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

 10 Ω.
 8 Ω.
  4 Ω.
  2 Ω.

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Bl2v2.
 Blv2.
 Blv.
 Bl2v.

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