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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  P.
  Z.
  none of these.
  P and Z.

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 Armature current.
 None of above.
 Line current.
 Field current.

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Open slot type machines.
 Closed slot type machines.
 Semi closed slot type machine.
 Any of the above.

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 1, 3, 5
 1, 2, 5
 1, 2, 3, 4
 2, 3, 4

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in parallel with the shunt field
 in series with the series field
 in series with the shunt field
 in parallel with the series field

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 4 ang 1
 4 and 2
 2 and 2
 2 and 1

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