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Electrical Machines

Electrical Machines
The output voltage of a DC generator is

 E = V + Ia.
 E = V + Ra.
 E = V – IaRa.
  E = V + IaRa.

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  providing damper bars in the rotor pole faces.
  running the motor on leading power factors.
  maintaining constant excitation.
  oscillation cannot be damped.

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

  Decreases.
 Remains unchanged.
 Increases.
 Oscillates around the rated speed.

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 10Ω
 200Ω
 100Ω
 50Ω

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Electrical Machines
On what factors the speed of dc motor depends?

 Applied voltage.
 Armature current Ia.
 Field flux.
 All of these.

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Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 2.2 ohms.
 5.7 ohms.
 6 ohms.
 1.9 ohms.

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