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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

 around 500 ohms.
  Low.
 Infinitely large.
 1000 ohms.

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Electrical Machines
Series booster is a

 shunt wound DC generator.
  series wound DC generator.
 separately excited DC generator.
 permanent magnet DC generator.

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Electrical Machines
Which of the following motors is/are widely used?

None of these
 squirrel cage induction motor
 either of these
 slip ring induction motor

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Electrical Machines
Resistance commutation is used generally in case of

None of these
  fractional kW DC machines.
 DC machines above 10 kW.
 DC machines bellow 5 kW.

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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.
 238.2 V.
 240 V.

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 both A and B.
 rating of generators should be same.
 polarities should be same.
 terminal voltage should be same.

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