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Electrical Machines

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

  4.
 8.
 16.
 32.

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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.

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

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 Full load torque.
 None of these.
 Full load speed.
  Full load current.

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Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 Pc/Pi
 √(Pi/Pc)
 Pi/Pc
 (Pi/Pc)2

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Electrical Machines
Which type of motors uses slip rings?

 Induction motors
 DC Shunt Motor
 Synchronous motors
 Both Synchronous and Induction motor

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 2 and 3
 1 and 3
 1 and 2
 1, 2 and 3

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