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Electrical Machines

Electrical Machines
Slot wedges in a dc machine is made up of

 cast iron.
 fibre.
 silicon steel.
 mild steel.

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 10Ω
 50Ω
 100Ω
 200Ω

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Reluctance motor.
  Stepper motor.
 Shaded pole motor.
 Hysteresis motor.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  reduces inter poles flux density.
  results in sparking trouble.
  reduces generator emf.
  increases armature speed.

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Armature control.
 Multiple voltage control.
 Ward-Leonard control.
 Field control.

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 zero power factor and slip tests.
 short circuit and slip tests.
 open circuit and zero power factor tests.
 open circuit and short circuit tests.

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