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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases
 remains constant.
 decreases.
 increases.

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

  75°.
 0°.
 45°.
 30°.

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 40
 660
 60
 600

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Electrical Machines
In escalator which motor is used?

  Universal motor.
  3 - φ IM.
  1 - φ IM.
  DC shunt motor.

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The speed of motor.
 The voltage across the terminals.
 The torque required.
 None of above.

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Electrical Machines
In DC machines shape of net flux density is?

 flat tapped or trapezoidal
 peaky in nature
 saddle shape
 sine wave

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