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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 same.
 less than 50%.
 between 50% and 90%.
 more.

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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

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

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Electrical Machines
Which of the following statements is/are correct ?

 Compensating winding will act under the pole.
 Both A and B.
None of these
 Inter pole winding will act in interpolar region.

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Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

  increasing armature resistance.
  increasing terminal voltage.
 increasing armature cooling.
  increasing input power of the prime mover.

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Electrical Machines
The output voltage of a DC generator is

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

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2.
 I1 = KI2 + Iw.
  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2 + Iμ.

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