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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

 10 %.
  15 %.
  2.5 %.
  20 %.

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  R2 = s2X2.
  sR2 = X2.
  R2 = s2X2.
  R2 = sX2.

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Reduce.
 Remain unaltered.
 Increase.
 Oscillate around the normal speed.

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

 supply frequency
 maximum flux density
 load current
 both 2 and 3

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

 5 %.
  2.67 %.
  30 %.
 1.5 %.

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