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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

None of these
  both A and B.
  DOL.
  star delta.

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Reduce armature heating.
 Increase speed
 Reduce starting torque.
 Increase acceleration duration.

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Electrical Machines
What is the highest possible speed of turbo alternators?

 1000 rpm
 1500 rpm
 4000 rpm
 3000 rpm

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Electrical Machines
Counter emf of a DC motor

 helps in energy conversion.
 regulates its armature voltage.
 aids applied voltage.
 exceeds supply voltage

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 any of above method.
 none of above.
 rheostatic control.
 Ward Leonard control.

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

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

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MORE MCQ ON Electrical Machines

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