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Electrical Machines

Electrical Machines
In escalator which motor is used?

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

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Applied voltage.
 All of these.
 Field flux.
 Armature current.

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 K×R1
 K²R1
 R1 /K
 R1 /K²

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 KVA ratings are equal
 turn- ratios are exactly equal
 percentage impedances are equal
 polarities are properly connected

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 4 point starter
 2 point starter
All of these
 3 point starter

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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.
 238.2 V.
  256.4 V.
 240 V.

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