Q.

Three-point starters are not suitable for application where speed variation by flux control is required because the motor may

  • ANot start 
  • BRun away
  • CStop at very high speed
  • DStop at very slow speed
Correct Answer : (C)

Stop at very high speed

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A dc shunt motor is driving a constant torque load with normal excitation. If the filed current is halved then the motor will run at 

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A dc shunt motor is driving a mechanical load at rated voltage with normal excitation. If the load torque is increased to double of the normal one, the speed of the motor will

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