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ExamIII-OldExamProblems

# ExamIII-OldExamProblems - 1 Water passes from Reservoir...

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1. Water passes from Reservoir 1 (W.S. Elev. = 135 ft) through a turbine into Reservoir 2 (W.S. Elev. = 100 ft). The total energy losses are equal 1.0 V 2 /2g due to pipe friction and pipe entrance and exit losses. If the discharge rate is 250 ft 3 /s, what power is supplied to the turbine by the fluid? 2. Determine the head loss in a 1000-ft length of 6-inch diameter glass pipe carrying 0.75 cfs of fluid. Kinematic viscosity = 0.0333 ft 2 /s. Mass density = 1.5 slug/ft 3 . 3. An oil tanker has run onto rocks and cannot move. To allow the buoyancy force to lift the tanker off the rocks, 1 million gallons of oil must be pumped out of the tanker within a 12-hour period (the period between low and high tides). Five hundred feet of 8-in. diameter pipe is to be used. The vertical lift from the surface of the oil in the tanker to the pipe exit is 40 ft. The surface of the oil in the tanker and the pipe exit are both open to the atmosphere. How much horsepower must be supplied to the fluid (using a pump) to meet these criteria. The friction loss in the pipe is 0.01 (L/D) (V 2 /2g). Neglect other losses. 4. The head loss in a 1000-ft length of 6-inch diameter glass pipe is 10 ft. Find the discharge. Kinematic viscosity = 0.0333 ft 2 /s. Mass density = 1.5 slug/ft 3 . 5. What pressure gradient would be required to reach a maximum point velocity of 1.0 ft/s between two horizontal fixed plates. The spacing between the plates is 0.02 ft. Specific weight = 62.4 lft/ft 3 ; dynamic viscosity = 2.36 x 10 -5 lbf-s/ft 2 . 6. A barge is 200 ft long and 40 ft wide and is being towed at a speed of 10 ft/s through still water. Compute the drag force. 7. Two reservoirs are connected by a 1000-m long, 0.2-m diameter concrete pipe. The difference in reservoir elevations is 10 m. Neglect pipe entrance and exit losses. What percent increase in discharge would result if this pipe were replaced with the same length and diameter of plastic pipe.

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