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Electrical Machines

Electrical Machines
Reactive power generated or delivered significantly depends on

 frequency.
 load angle.
 excitation.
 both 1 and 2.

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 200Hz.
 150Hz.
 100Hz.
 50Hz.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 synchronous speed.
 normal speed.
 any of the above.
 slip speed.

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.5 p.u
  0.125 p.u
  0.25 p.u
  0.75 p.u

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 either of these.
 increase.
None of these
 decrease.

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

  65.8 Nm.
 27.73 Nm .
 74 Nm.
 38.5 Nm.

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MORE MCQ ON Electrical Machines

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