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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.443.
  0.573.
 0.512.
 0.649.

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 0.2 ohm
 100 ohm
 10 ohm
 2 ohm.

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Electrical Machines
A DC series motor has which of the following characteristics?

 Can be started easily without load.
 Has a poor torque.
 Has a almost constant speed.
 Has its field winding consinting of thick wire and less no of turns.

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

 Resistance split phase motor
 Capacitor split phase motor
All of these
 Capacitor run motor

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Electrical Machines
The armature resistance of the dc motor is generally of the range

 50 ohm.
 100 ohm.
  0.1 ohm.
  0.5 ohm.

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 zero
 20 V
 50 V
 40 V

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