2-73.An annunition hoist is powered by a2-hp motor.Working at full load,how long does it take the motor toraise a 50–pound shell 22 feet fromthe handling room to the gunturret?1.1/2sec2. 1sec3.1 1/2 sec4. 2sec2–74.If it is desired to develop tenusable horsepower from an enginewhich is 50 percent efficient, theengine must have a minimum ratedhorsepower of at least1. 102.203.1004.1502–75.What information is sufficient tofind the horsepower rating of amotor by means of the Prony brakein figure 8–3 of the textbook?1.The readings on both scales,the radius of the pulley, andthe time it takes the motor toreach maximum speed2.Tile readings on both scales.the radius of the pulley, andthe speed of the motor3.The readings on both scales,the radius of the pulley, andthe diameter of the motor shaft.4.The radius of the pulley andthe readings on the scales whenthe belt is pulled tight enoughto prevent the motor fromturning21
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