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Electrical Machines

Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 1000 rpm
 950 rpm
 940 rpm
 975 rpm

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

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

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Electrical Machines
For power factor improvement the synchronous motor is to be

 heavily loaded and underexcited
 heavily loaded and over excited
 lightly loaded and over excited
 lightly loaded and underecited

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

  Differentical compound.
 Cummulative compound.
 Series shunt.
 have an equal number of electrons and protons.

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Electrical Machines
Field weakening control method is used for the _________ ?

 above rated speed
 both A and B
 below rated speed
None of these

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Electrical Machines
Maximum power developed by a synchronous motor depends on

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

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