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Electrical Machines

Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 decreases.
 remains same.
 increases.
None of these

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 damping torque.
 mechanical rotatory system.
 synchronizing power co efficient.
  restoring torque.

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve and the speed falls.
 deteriorate and the speed falls.
 deteriorate and the speed rises.
 improve and the speed rises.

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

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

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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

 60%
 38%
 68%
 40%

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

  Differentical compound.
 have an equal number of electrons and protons.
 Cummulative compound.
 Series shunt.

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