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Electrical Machines

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

 30°.
 45°.
  75°.
 0°.

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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 slip rings.
 commutator.
 none of above.
 solid connection.

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/4S
 PZL/ 4Sa
 PZL/4Sp²
 PZL/4Sa²

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 0.96
 1.06
 0.87
 0.95

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Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Shunt.
  Series.
  Compound.
  None of them.

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Electrical Machines
Which of the following bearings and their uses are correct

 neither 1 nor 2
 roller bearings → large machines
 both A and B
 ball bearings → small machines

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