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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 36°
 18°
 72°
 30°

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

 800 Amp.
  0.5 Amp.
 320 Amp.
  400 Amp.

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 commutator
 field winding
 starters
 armature winding

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Electrical Machines
No load saturation characteristics are plotted between

 short circuit current and field current
 no load voltage and field current
 no load voltage and armature current
 short circuit current and armature current

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

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

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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.
 Blv2.
 Bl2v.
 Bl2v2.

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