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Electrical Machines

Electrical Machines
Which of the following will vary the maximum torque?

 both 1 and 2
 rotor reactance X
 rotor resistance R
None of these

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC Shunt motor.
 Separately excited DC motor.
 DC compound motor.
 DC series motor.

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

 240 V.
  256.4 V.
 271.7 V.
 238.2 V.

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

 1.
 4.
  8.
 2.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 50Hz
 1 Hz
 2.5Hz
 2HZ

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 30°.
 45°.
 0°.
  75°.

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