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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 parabola
 hyperbola
 linearised
 any of the above

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 armature circuit resistance control
All of these
 supply voltage control
 field current control

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 Parallel.
  Series.
 Compound.
 None of the options.

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Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

 generation of voltage.
 electromechanical energy conversion.
 development of torque.
 commutation.

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

 decrease.
 remains constant.
 increase.
None of these

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 220 V
 somewhat less than 220 V
 6 V
 more than 220 V

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