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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  all of below.
  less cost.
  simple in construction.
  less maintenance.

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

 38.5 Nm.
  65.8 Nm.
 74 Nm.
 27.73 Nm .

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Electrical Machines
At stand still condition the value of slip is

 0
 finite value
 infinite value
 1

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Electrical Machines
The field divertor resistance for a DC series motor is of order of

 50 Ω
 10 Ω
 100 Ω
 0.1 Ω

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

 210 V.
 205 V.
 212 V.
  201.02 V.

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

 less than that of second transformer.
 none of these.
 equal to that of second transformer.
  more than that of second transformer.

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