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Electrical Machines

Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

  2 Hz.
  3 Hz.
 10 Hz.
 50 Hz.

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Electrical Machines
Regenerative braking is not found in which motor?

 Induction motor.
  DC series.
 DC compound.
 DC shunt.

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmax to Imin
 Vmin to Imax
 Vmax to Imax
 Vmin to Imin

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 have an equal number of electrons and protons.
 Cummulative compound.
 Series shunt.
  Differentical compound.

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Differential compound motor.
  Shunt motor.
  Series motor.
  Cumulative compound motor.

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 4*ωm
 ωe = 2*ωm
 ωe = ωm
 ωe = 1/2*ωm

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