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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Motor frame.
 Armature.
 Coupling mounted on the shaft.
 Field.

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Normal.
 Very low.
 Zero.
 Very high.

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Electrical Machines
In an ideal DC generator the regulation is

 zero.
 low.
 positive.
 high.

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Electrical Machines
The polarity of a DC generator can be reversed by

 reversing the field current.
 any of above.
 increasing field current.
 reversing field electric current as well as direction of rotation.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 1130 r.p.m.
 1037.5 r.p.m.
 963.8 r.p.m.
 4575.4 r.p.m.

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

 On yoke in the inter pole gap.
  On yoke in the pole faces.
None of these
 On armature.

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