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Electrical Machines

Electrical Machines
Belt conveyors offer _______________ starting torque.

  high.
  medium.
  zero.
  low.

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

 27.73 Nm .
 38.5 Nm.
  65.8 Nm.
 74 Nm.

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 either of these
None of these
 constant V, Tst increases
 constant supply voltage V, starting torque Tst decreases

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 32.
 8.
 16.
  4.

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

 Operating cost is less.
 Insulation requirement is less.
All of these
 Collecting of large current is simple.

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Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

 1 and 3
 2 and 3
 1 alone
 1 and 2

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