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Electrical Machines

Electrical Machines
The breakdown torque of a synchronous motor varies as

 V²
 1/V²
 applied voltage V
 1/V

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 imperfect contact.
 severe sparking.
 rough commutator surface.
 any of above.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 zero, 950 rpm.
 1000 rpm, - 50 rpm.
 1000 rpm, 950 rpm.
 zero , - 50 rpm.

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 commutation
 development of torque
 generation of voltage
 electromechanical energy conversion

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Electrical Machines
Conservator tank is used

 to take up the expansion of oil due to temperature rise.
 to act as an oil storage.
None of these
 for better cooling of transformer.

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 Proportional to the square of armature current.
 Proportional to the armature current.
 Inversely proportional to the armature current.
 None of above.

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MORE MCQ ON Electrical Machines

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