The time constant of the field winding, Electrical Engineering

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The field winding of a 200 V d.c. machine has a resistance of 20? and an inductance of 500mH.

Calculate:

(a)  The time constant of the field winding

(b)  The value of current flow one time constant after being linked to the supply

(c)  The current flowing 50 ms after the supply has been switched on. 

 


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