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Electrical Machines

Electrical Machines
Equalizer rings are used in which of the followings?

 lap winding
 wave winding
None of these
 both 1 and 2

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Electrical Machines
Torque developed in the rotor is

 directly proportional to slip
 inversely proportional to slip
 either of these
 not dependent on the slip

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Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 850 rpm
 950 rpm
 1000 rpm
 900 rpm

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 mechanical loss
 both A and B
 iron loss
 copper loss

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

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

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Electrical Machines
Which of the following represents the pitch factor?

 Cos α²
 Cos α
 sin (α/2)
 Cos (α/2)

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MORE MCQ ON Electrical Machines

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