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Electrical Machines

Electrical Machines
Field weakening control method is used for the _________ ?

 below rated speed
 above rated speed
None of these
 both A and B

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 240 V.
 280 V.
 220 V.
 150 V.

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Electrical Machines
In which of the following motors DC excitation is not required?

 hysteresis motor
 3-phase synchronous motor
 3-phase synchronous generator
 reluctance motor

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Bl2v.
 Bl2v2.
 Blv2.
 Blv.

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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 none of above.
 commutator.
 solid connection.
 slip rings.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2HZ
 1 Hz
 2.5Hz
 50Hz

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