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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 10°
 30°
 60°
 45°

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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
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 0 V.
 20 V.
 60 V.
  40 V.

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Electrical Machines
Which of the following is minimized by laminating the core of a transformer?

 Stray loss.
 Eddy current loss.
 Copper loss.
 Hysteresis loss.

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Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

 1 alone
 1 and 2
 2 and 3
 1 and 3

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 zero.
 less than normal speed.
 normal speed.
 more than normal speed.

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