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ELECTRICAL MACHINES

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 )

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

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Electrical Machines
A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be

 2.7 mWb.
  1.2 mWb.
 1.4 mWb.
 3.5 mWb.

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Electrical Machines
What is the full form of MNP?

  Magnetic field neutral plane.
  Magnetic neutral plane.
  Magnetic neutral pole.
  Magnetic field neutral pole.

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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

 225 Ω.
  375 Ω.
 150 Ω.
 145 Ω.

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Electrical Machines
The polarity of a DC generator can be reversed by

 any of above.
 reversing the field current.
 increasing field current.
 reversing field electric current as well as direction of rotation.

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