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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  none of these.
  wound.
  cage.
  linear.

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Electrical Machines
The polarity of a DC generator can be reversed by

 any of above.
 reversing field electric current as well as direction of rotation.
 increasing field current.
 reversing the field current.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 less and maximum torque increases
 more and maximum torque decreases
 more and maximum torque remains constant
 less and maximum torque decreases

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 both decrease
 decrease and increase respectively
 both increase
 increase and decrease respectively

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

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

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 10 volts.
 30 volts.
 40 volts.
 20 volts.

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