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Electrical Machines

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

 MNA
None of these
 either GNA or MNA
 GNA

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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 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 2.2 Ω
 5.7 Ω
 6 Ω
 1.9 Ω

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Electrical Machines
The direction of rotation of a DC motor can be determent by

  Flemings left hand rule.
 Lenzs law.
 Amperes law.
 Flemings right hand rule.

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Electrical Machines
In DC machines internal characteristics are plotted between

 Vt vs Ia
 Vt vs load current
 Eg vs Ia
 Eg vs load current

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 shifting the brush axis from GNA to MNA.
  compensating winding and commutating poles.
 increasing field excitation.
 fixing the brush axis inline with the pole axis.

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Blv.
 Bl2v2.
 Bl2v.
 Blv2.

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