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ELECTRICAL MACHINES

Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Same as full load.
  High.
  Equal to 1.
  Low.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 60, 1440.
 50, 1500.
  60, 1500.
 1440, 1500.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Crawling in an induction motor is due to

  slip ring rotor.
  time harmonics in supply.
  insufficient starting torque.
  space harmonics produced by winding currents.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
During no load test, an induction motor draws power

  only for the small copper loss.
  for core loss and copper loss.
  for core loss and windage and friction loss.
  for copper loss and windage friction loss.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  less heating of the rotor.
  negative sequence current.
  all of these.
  less heating of the rotor.

ANSWER DOWNLOAD EXAMIANS APP
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