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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

 Silicon steel.
 Cast iron.
  Fibre.
 Mild steel.

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Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  improve starting torque.
  improve efficiency.
  reduce copper loss.
  improve power factor.

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 Greater than 1.
 0.5.
 0.25.
 near to 1.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt= Ea + Iara
 Vt= Ea– Iara
 Vt = Ea + Iara+ ILrs
 Vt = Ea + Ia(ra + rs)

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Same in both induction motors.
None of these
 Slip ring induction motor.
 Squirrel cage induction motor.

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  increase the starting torque.
  reduce the magnetizing current.
  reduce the chance of cogging.
  reduce the chance of crawling.

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MORE MCQ ON Electrical Machines

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