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Electrical Machines

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

 4000 rpm
 1000 rpm
 3000 rpm
 1500 rpm

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Electrical Machines
Methods of synchronizing of alternator may be done by

  all of these.
 one dark two bright.
 all bright lamp method.
 all dark lamp method.

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Interchanging armature and field connection.
 Reversing supply connection.
 Adding resistance to field circuit.
 Reversing armature connection or field connection.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and over excited
 heavily loaded and underexcited
 heavily loaded and over excited
 lightly loaded and underecited

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

All of these
 pole stacking
 compensating winding
 pole chamfering

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Zener diode shunt regulator.
  Transistor shunt regulator.
None of these
  Transistor series regulator.

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MORE MCQ ON Electrical Machines

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