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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmax to Imin.
 Vmin to Imin.
 Vmin to Imax.
 Vmax to Imax.

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Electrical Machines
An electric motor with constant output power will have a torque speed characteristics in the form of a

 Straight line parallel to the speed axis.
 Circle about the origin.
 Straight line through the origin.
 Rectangular hyperbola

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Electrical Machines
The working principle of transformer depends on

 Amperes law.
 Coulombs law.
 Newtons law.
 Faradays law of electromagnetic induction.

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Electrical Machines
Speed of DC motor can be controlled by varying

 all of these.
 applied voltage.
 its flux oer pole.
 resistance of armature culture.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 60, 1440.
 1440, 1500.
 50, 1500.
  60, 1500.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 100 W, 2000 W.
 6000 W, 7000 W.
 1000 W, 5040 W.
  3190 W, 5040 W.

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