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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
 1000 rpm
 950 rpm
 850 rpm

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Electrical Machines
Maximum power developed depends on

 load angle
 reactance
 both 1and 2
 voltage

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Electrical Machines
On what factors the speed of dc motor depends?

 All of these.
 Armature current Ia.
 Field flux.
 Applied voltage.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 3000 rpm
 1500 rpm
 75 rpm
 375 rpm

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2.5Hz
 50Hz
 1 Hz
 2HZ

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

  2 Ω.
  4 Ω.
 10 Ω.
 8 Ω.

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