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Electrical Machines

Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 900 rpm
 850 rpm
 950 rpm
 1000 rpm

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

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

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

 30000 - 100000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.

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Electrical Machines
What is the mechanical power developed by a DC series motor is maximum?

 Back emf is equal to half the applied voltage.
 None of above.
 Back emf is equal to zero.
 Back emf is equal to applied voltage.

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Reversing supply connection.
 Reversing armature connection or field connection.
 Adding resistance to field circuit.
 Interchanging armature and field connection.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 cant be determined.
 266.20 N-m.
 234.76 N-m.
 133.22 N-m

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