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Electrical Machines

Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 60 Hz
 40 HZ
 50 Hz
 25 Hz

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lead
 0.9 lag
 unity
 0.2 lag

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Electrical Machines
A DC generator without commutator is a

 induction motor
 DC motor
 AC generator
 DC generator

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

  cumulatively compounded.
 shunt connected.
  series connected.
  deferentially compounded.

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Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 6 ohms.
 1.9 ohms.
 5.7 ohms.
 2.2 ohms.

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  capacitor run IM.
  repulsion motor type starting.
  transformer with short-circuited secondary.
  synchronous motor.

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MORE MCQ ON Electrical Machines

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