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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
 1
 50
 100

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 continuity supply is maintained
All of these
 Increase in reliability
 Increase efficiency under light load conditions

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Electrical Machines
In electric locomotives which of the following motor are used ?

 DC compound motor.
 DC Shunt motor.
 Synchronous motor.
 DC series motor.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 remains same.
 increase.
 none of these.
 Decrease.d

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Electrical Machines
If iron loss and full load copper loss of any transformer are denoted by Pi and Pc, then the load corresponding to maximum efficiency is given by

 (Pi / Pc)1.6 × full Load.
  (Pi / Pc)0.5 × Full Load.
 (Pi / Pc) × full Load.
 (Pi / Pc)2 × full Load.

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Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 √(Pi/Pc)
 (Pi/Pc)2
 Pi/Pc
 Pc/Pi

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