Description : A cumulative dc compound motor runs at 1500 rpm. on full load. If its series field is short-circuited, its speed (1) becomes zero (2) remains unchanged (3) increases (4) decreases
Last Answer : Increases. As it's cumulative compound motor, both series and shunt field both assist each other. If series field is short circuited, the overall field strength will decrease and atop of that ... speed is inversely proportional to field strength. So, the speed will increase overall.