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Electrical Machines

Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 37
 72
 36
 74

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

 127 A.
 240 A.
  190 A.
 173 A.

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 1 and 3
 2 and 3
 1, 2 and 3
 1 and 2

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 100Ω
 50Ω
 10Ω
 200Ω

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Electrical Machines
Armature of DC machine is made of

 non-ferrous material.
 conducting material.
 insulating material.
 silicon steel.

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/4SP²
 PZL/4Sa²
 PZL/4S
 PZL/ 4Sa

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