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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
 1
 50
 10

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to avoid locking of the armature.
 to achieve a stronger magnetic field.
All of these
 to avoid over heating.

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in series with the shunt field
 in parallel with the series field
 in parallel with the shunt field
 in series with the series field

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 increases.
None of these
 decreases.
 remains same.

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 11.4 A, secondary = 301 A
 primary = 22.7 A, secondary = 602.4 A
 primary = 301 A, secondary = 22.7 A
 primary = 602 A, secondary = 22.7 A

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Electrical Machines
Commutator in DC generator is used for

 reduce losses
 convert AC armature current in to DC
 increase efficiency
 collecting of current

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