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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 90o.
 0o.
 180o.
 dependent upon the load.

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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 hyperbola
 parabola
 linearised
 any of the above

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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
 50Ω
 200Ω
 100Ω

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 800W, 1600W
 1000W , 1400W
 1600W, 800W
 1400W, 1000W

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 25 W.
 36 W.
 28 W.
 30 W.

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 36°
 30°
 72°
 18°

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MORE MCQ ON Electrical Machines

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