Electrical Machines
Skewing of the rotor in a 3 - Φ squirrel cage induction motor reduces

  noise and parasitic torque, but increase starting and pull-out torque.
  noise, parasitic and starting torque, but increase pull out torque.
  noise and pullout torque, but increase parasitic and starting torque.
  noise, parasitic torque, starting torque and pull out torque.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In case of 3 - Φ IM, plugging means

  pulling the motor directly on line without a rotor.
  starting the motor on load which is more than the rated load.
  interchanging two supply phases for quick stopping.
  locking of rotor due to harmonics.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then

 Ph will decrease but Pe will remain same
 Ph will increase but Pe will decrease
 Pe will increase but Ph will decrease
 both hysteresis loss(Ph) and eddy current loss(Pe) will increase

ANSWER DOWNLOAD EXAMIANS APP