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What is the percentage of stray losses in DC machine?
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Percentage of stray losses in DC machine is about 1 % .

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Iron losses in a D.C. machine are independent of variations in load.

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Copper losses,iron losses,variable losses , constant losees

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The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is  (1) 1000V (2) 100V (3) 600V (4) 10,000V

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The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is 1000V

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In a dc machine, interpoles are used to  (1) neutralize the effect of armature reaction in the interpolar region (2) generate more induced emf in the armature (3) avoid interference of the armature flux with the main -field flux (4) reduce the demagnetizing effect of armature reaction

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In a dc machine, interpoles are used to neutralize the effect of armature reaction in the interpolar region

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The magnetic neutral plane shifts in a dc machine in the direction of motion of generator

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Why poles of dc machine are laminated?

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A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is 0.87

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Brushes of DC machine are made up of carbon.

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In a D.C. generator, the iron losses mainly take place in armature rotor.

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