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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

 10
 50
 1
 100

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve and the speed rises.
 improve and the speed falls.
 deteriorate and the speed rises.
 deteriorate and the speed falls.

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Electrical Machines
If the excitation is increased, the power factor is

 unity power factor
 leading power factor
 lagging power factor
None of these

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the motor may run away.
 the starting current will be enormously high.
 the starting torque becomes low.
 the motor may not start.

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Electrical Machines
What is the highest possible speed of turbo alternators?

 1000 rpm
 1500 rpm
 4000 rpm
 3000 rpm

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 reduce by 5 %.
 depend on other factors.
 remain unchanged.
 increase by 5 %.

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