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Electrical Machines

Electrical Machines
Which of the following relation is correct?

 Xd = Xq.
None of these
 Xd < Xq.
 Xd > Xq.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 1037.5 r.p.m.
 1130 r.p.m.
 4575.4 r.p.m.
 963.8 r.p.m.

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 750 rpm
 3000 rpm
 1500 rpm
 1000 rpm

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Electrical Machines
DC shunt motors are suitable for

 Blowers and fans.
 Centrifugal pumps
 Lathes.
  All of this.

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

 will become leading
 will remain the same
 will become lagging
None of these

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 1
 2
 3 or 4
 0

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