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Electrical Machines

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

 zero
 minimum
All of these
 maximum

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Electrical Machines
The emf induced in the dc generator armature winding is

None of these
 DC
 AC and DC
 AC

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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?

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

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  maximum.
  minimum.
  constant.
  variable.

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of iron.
 reluctance of core.
 volume of copper.
 iron loss.

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  mechanical losses.
  ohmic losses.
  hysteresis losses.
  eddy current losses.

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