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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  voltage.
 speed.
  speed and voltage.
  load.

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Electrical Machines
Regenerative braking is possible in

  DC shunt motor with field weakening control.
 DC series motor.
 DC shunt motor with armature resistance control.
 DC compound motor.

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

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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.

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

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 2000 Volt.
 1600 Volt.
  0 Volt.
 1500 Volt.

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Electrical Machines
A DC generator without commutator is a

 DC motor
 DC generator
 induction motor
 AC generator

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