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Electrical Machines

Electrical Machines
The commutator segments of DC machines are made up of

 brass
 hard-drawn copper
 copper alloy
 copper

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Torque and field current.
 Armature current and torque.
  Armature current and field current.
 Power factor and field current.

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 36.36% increase
 18.18% increase
 36.36% decrease
 36.36% increase

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

  0.65 Hz.
 0.75 Hz.
 0.70 Hz.
  60 Hz.

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 10V
 200V
 100V
 20V

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Electrical Machines
What is the actual arrangement of series wound generator?

  Armature and field both are in series with the load.
 Armature winding is in series with load.
 Armature and field both are parallel.
 Armature and field both are connected.

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