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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?

 1000 rpm
 850 rpm
 900 rpm
 950 rpm

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

 KhfBm3.
  KhfBm1.6.
 KhfBm.
 Khf2Bm1.6.

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Electrical Machines
Which of the following induction motor has the highest starting torque?

None of these
 Same in both induction motors.
 Slip ring induction motor.
 Squirrel cage induction motor.

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Electrical Machines
Which of the following voltage regulation method is accurate ?

 ZPF method
 American standard association method
 MMf method
 Synchronous impedance method

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 120 V
 175 V
 140 V
 240 V

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = ωm
 ωe = P*ωm
 ωe = 2/P*ωm
 ωe = P/2*ωm

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