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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

 50
 100
 1
 10

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Electrical Machines
Transformer action requires a

 increasing magnetic flux.
 alternating electric flux.
 alternating magnetic lux.
 constant magnetic flux.

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Electrical Machines
In DC machines internal characteristics are plotted between

 Eg vs Ia
 Vt vs load current
 Eg vs load current
 Vt vs Ia

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Electrical Machines
Torque developed in the rotor is

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

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Electrical Machines
In DC machine torque depends on which of the following?

 both A and B
 flux (φ)
 speed
 armature current (I)

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Electrical Machines
Universal motors are used in

 cranes
 food processing
 traction
All of these

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