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Electrical Machines

Electrical Machines
The armature reaction mmf in a DC machines has a form of

 rectangular.
 sinusoidal.
  triangular.
 trapezoidal.

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 230 V
 115 V
 200 V
 460 V

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Electrical Machines
The armature shaft must be able to withstand

All of these
 bending moment due to weight of the armature.
 any unbalanced magnetic pull on the armature core.
 twisting strains due to transmission of torque.

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

  2 Ω.
 10 Ω.
 8 Ω.
  4 Ω.

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Electrical Machines
The short circuit test on a transformer is conducted to obtain

 core loses only.
 eddy current loss.
 hysteresis loss.
  copper losses.

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Electrical Machines
A DC Shunt Motor having shunt field resistance of 250 Ω and armature resistance of 0.5 Ω is connected to 250 V supply and load current of 21 A. What is the back emf generated ?

 210 V
 150 V.
 230 V.
 240 V.

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