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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  none of these.
  EbIa2.
  EbIa.
  EIa.

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

 963.8 r.p.m.
 4575.4 r.p.m.
 1037.5 r.p.m.
 1130 r.p.m.

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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

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

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Electrical Machines
Which of the following motors has negative speed regulation?

 Both B and C.
 Shunt motors.
 Differential compound motors.
 Series motors.

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1920W
 2000W
 1820W
 1450W

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Electrical Machines
Dynamic braking can be used for

 shunt motors.
All of these
 series motors.
 compound motors.

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