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[" D.C.motor run by "120V" .If armature current at e "_(b)],[=115V" is "10A" ,then find out current just after "],[" motor is started:- "],[[" (1) "240A," (2) "230A],[" (3) "120A," (4) "400A]]

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D.C motor run of 120 V . If armature current at e_(b) = 115 V is 10 A . Then find out current just after motor is started :

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A motor operating on 120 V draws a current of 2 A . If the heat is developed in the motor at the rate of 9 cal s^(-1) , what is the efficiency?