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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

 250 - 500 W.
 200 - 250 W.
  50 - 150 W.
 10 - 20 W.

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Electrical Machines
Induction motors provided with open slots have

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

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 3.2% and -1.6%
None of these
 4.8% and -3.2%
 6% and -4%

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Electrical Machines
A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?

 750.
 200.
  100.
 500.

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  continue running in the same direction as before.
  not run.
  run in a direction opposite to previous one.
  get damaged.

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  as wide as possible.
  depends on the material of stator and the rotor.
  air gap does not matter.
  as small as possible.

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Electrical Machines

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