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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 44 A.
 440 A.
 40 A.

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Electrical Machines
Armature reaction effect is more in which of the following methods?

None of these
 armature resistance control
 field weakening method
 same in both methods

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 15.28 Nm
 16.55 Nm
 Zero
 15.6 Nm

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Electrical Machines
In induction motor wound rotor motor is mainly is used in application where

  high starting torque.
  low starting torque.
 power factor is less.
  less costly motor is not required.

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

All of these
 4 point starter
 3 point starter
 2 point starter

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 48 Hz
 48.5 Hz
 45 HZ
 50 Hz

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