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Electrical Machines

Electrical Machines
Hysteresis loss will depends on

 f1.6
 f
 f³
 f²

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Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is

  375 Ω.
 225 Ω.
 150 Ω.
 145 Ω.

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 2000 Volt.
  0 Volt.
 1600 Volt.
 1500 Volt.

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Electrical Machines
What is the necessity of copper brushes in a dc motors?

  To convert alternating supply current to direct current.
  None of these.
  To absorb the mechanical shocks produced during running condition.
  To increase the flux cutting by the rotor.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 230 V
 somewhat less than 230 V
 somewhat more than 230 V
 6 V

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

 proportional to square of rotor speed.
 constant independent of speed.
  proportional to rotor speed.
 zero.

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