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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

None of these
 DC shunt motors.
 DC series motors.
 DC compound motors.

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 both B and C
 series generators
 shunt generator
 over compound generator

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

  43 Amp.
 44.47 Amp.
  33.33 Amp.
 29 Amp.

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

 will become leading
None of these
 will remain the same
 will become lagging

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  in none of above positions.
  along field axis.
  along neutral axis.
  in any of above positions.

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

  no resistance is connected.
  series.
  parallel.
  any one of the connection.

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