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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 50 Hz
 5 Hz
 1 Hz
 0 Hz

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Electrical Machines
The starting resistance of DC motor is generally

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

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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

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

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Electrical Machines
Which of the following DC motors has got maximum relieving property?

 Shunt.
  Series.
 Cummulative compound.
 Differentical compound.

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Electrical Machines
What is the necessity of copper brushes in a dc motors?

  To increase the flux cutting by the rotor.
  To absorb the mechanical shocks produced during running condition.
  None of these.
  To convert alternating supply current to direct current.

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  4000 rpm.
  3000 rpm.
  1500 rpm.
  3600 rpm.

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