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Electrical Machines

Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 2000W
 1920W
 1450W
 1820W

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 Full load torque.
  Full load current.
 Full load speed.
 None of these.

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Electrical Machines
Alternator operates on the principle of

  electromagnetic induction.
  self or mutual induction.
  mutual induction.
  self induction.

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Electrical Machines
No load saturation characteristics are plotted between

 no load voltage and armature current
 short circuit current and field current
 short circuit current and armature current
 no load voltage and field current

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 the voltage generated will be zero.
 machine will generate maximum voltage.
 field winding will burn.
 machine will generate maximum power.

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  sipper.
  thinner.
  thicker.
  rotor can not have any laminations.

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