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Electrical Machines

Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 40W
 100W
 80W
 60W

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Electrical Machines
The condition for maximum running torque is

 0.5 lagging
 unity
 R = S.X
 zero
 0.707 lagging

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Electrical Machines
A DC series motor must started on no load because it would

 Not develop starting torque.
 Fail to start without load.
  Run at dangerously high speed.
 Draw more current without producing sufficient torque.

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 maximum flux density
 both 2 and 3
 supply frequency
 load current

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Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?

 pure inductive load
None of these
 pure capacitive load
 pure resistive load

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmin to Imin.
 Vmax to Imax.
 Vmin to Imax.
 Vmax to Imin.

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