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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 iron loss
 copper loss
 both A and B
 mechanical loss

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 440 A.
 400 A.
 44 A.
  40 A.

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

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = 2/P*θmech
 θelec = θmech
 θelec = P/2*θmech
 θelec = 4/P*θmech

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Electrical Machines
Armature reaction in DC generators will result in

 reduction in generated emf.
 open circuit.
 increase in slip.
 short circuit.

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 88.8%.
 57.1%.
 48.0%.
 59.2%.

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