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Electrical Machines

Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 minimum
 maximum
All of these
 zero

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  Can't be determined.
  15 N.
  None of these.
 20 N.

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Electrical Machines
Swinburne's test is applicable to

 DC shunt and level Compound motor.
 DC compound motor.
 DC Shunt motor.
 DC series motor.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

 1920 Watt.
  1960 Watt.
  980 Watt.
 1800 Watt.

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1080
 1200
 1000
 1203

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Electrical Machines
The ventilating ducts in most of DC machine are

 radial as well as longitudinal.
 longitudinal.
 radial.
 none of these.

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