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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

  carbon.
 copper.
 cast iron.
 mica.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 somewhat less than 230 V
 230 V
 6 V
 somewhat more than 230 V

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 short circuit and slip tests.
 open circuit and zero power factor tests.
 zero power factor and slip tests.
 open circuit and short circuit tests.

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 excitation and load angle
 supply voltage, load angle and excitation
 supply voltage and excitation
 supply voltage and load angle

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

None of these
 DC.
 AC.
 both of above.

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Electrical Machines
The short circuit test on a transformer is conducted to obtain

  copper losses.
 hysteresis loss.
 eddy current loss.
 core loses only.

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