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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 MNA
 either GNA or MNA
 GNA
None of these

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 interpole and compensating windings together
 interpole winding
 armature winding
 field winding

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

  30 %.
 5 %.
  2.67 %.
 1.5 %.

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Electrical Machines
Torque developed in the rotor is

 not dependent on the slip
 either of these
 directly proportional to slip
 inversely proportional to slip

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Electrical Machines
What is the full form of MNP?

  Magnetic neutral pole.
  Magnetic field neutral pole.
  Magnetic neutral plane.
  Magnetic field neutral plane.

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Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 6 ohms.
 5.7 ohms.
 2.2 ohms.
 1.9 ohms.

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