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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  none of these.
  P and Z.
  P.
  Z.

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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

 25 %.
 50 %.
 15 %.
  10 %.

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 not suitable for rapidly changing loads.
 constant speed.
 less expensive.
 none of above.

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Electrical Machines
Ward Leonard control provides speed control

 below rated speed.
 in one direction only.
 above rated speed.
 in both direction.

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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be

 oscillating
None of these
 steady and unidirectional
 pulsating and unidirectional

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Electrical Machines
It is advisable to start a DC series motor with some load to

 Avoid sparking.
 Limit the flux.
  Limit the speed.
 Limit the current.

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MORE MCQ ON Electrical Machines

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