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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Domestic pump.
  Traction.
  Food mixer.
  Lift.

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 2 .1 Ω
 1.8 9 Ω
 1.79 Ω
 3.1 Ω

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 zero
 more than 6 V
 less than 6 V
 6 V

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Electrical Machines
No load test on induction motor is conducted to find which of the following losses?

 Stator copper loss
 Stator core loss
 Rotational loss
All of these

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  heavy copper or aluminium bars placed in rotor slots.
  single phase winding.
  heavy short-circuited end rings.
  three phase winding.

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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, 3
 2, 3
 1, 4

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