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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 less than 50%.
 same.
 between 50% and 90%.
 more.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 1/Ia
 I/Ia2
 Ia2
 Ia

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

 271.7 V.
  256.4 V.
 240 V.
 238.2 V.

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Armature voltage control.
 Any of above.
 Armature circuit resistance control.
 Field resistance control.

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Electrical Machines
What is the mechanical power developed by a DC series motor is maximum?

 Back emf is equal to zero.
 Back emf is equal to half the applied voltage.
 None of above.
 Back emf is equal to applied voltage.

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  variable.
  minimum.
  maximum.
  constant.

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