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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 100
 50
 1
 10

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Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / E2
 (V2 - E2) / V2
 (E2 - V2) / E2
 (E2 - V2) / V2

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Electrical Machines
A shaded pole single phase induction motor can be used for

 personal computers as cooling fan
 tape recorders
 wet grinders
 food mixers

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Electrical Machines
Which of the following motors has low ratings only?

 Resistance split phase
 Capacitor run
 Capacitor start
 Shaded pole

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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?

 950 rpm
 1000 rpm
 850 rpm
 900 rpm

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt generator.
  DC series generator.
  DC series motor.
 DC shunt motor.

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