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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / V2
 (E2 - V2) / E2
 (V2 - E2) / E2
 (E2 - V2) / V2

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 30 rpm
 1500 rpm
 zero
 1470 rpm

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

 0.78 Ω.
 0.66 Ω.
 0.45 Ω.
  0.24 Ω.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 4575.4 r.p.m.
 1130 r.p.m.
 1037.5 r.p.m.
 none of above.

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 changing the load.
 varying the speed.
 changing the field excitation.
 varying the applied voltage.

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.905.
 1.1.
  0.05.
 20.

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