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Electrical Machines

Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 3KW
 0.5Kw
 1.5KW
 2KW

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Electrical Machines
Induction motors provided with open slots have

  higher efficiency.
  less breakdown torque.
  more breakdown torque.
  leading power factor.

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Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / E2
 (V2 - E2) / E2
 (E2 - V2) / V2
 (V2 - E2) / V2

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the source frequency.
 increase the number of turns in armature coil.
 increase the number of turns in field coil.
  increase the speed of shaft rotation.

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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

 3.1 Ω
 2 .1 Ω
 1.79 Ω
 1.8 9 Ω

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Electrical Machines
Which of the following machine will have maximum efficiency?

  Electrical power transformer.
 DC motor.
 Induction motor.
 Electrical power generator.

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