CIVL315-2012 Quiz3

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CIVL 315 DEPARTMENT OF CIVIL ENGINEERING October 12, 2012 CIVL 315: FLUID MECHANICS II Quiz #3 You have 40 minutes to complete this quiz. The quiz is closed book, a calculator is allowed. Indicate your answers on the scantron sheet provided with your booklet. Remember to write your name and student number on your scantron sheets. You MUST use a pencil , otherwise the machine cannot process your answers and you will end up with a ZERO mark. CANDIDATE'S NAME: (Please print) STUDENT NUMBER:
CIVL 315 Pumps summary 1. A centrifugal pump with a 12 in. diameter impeller requires a power input of 60 hp when the flow rate is 3200 gpm against a 60 ft head. The impeller is changed to one with a 10 in. diameter. Determine the expected flow rate if the pump speed remains the same. A. 1250 gpm B. 1850 gpm C. 2250 gpm D. 3000 gpm 2. Same as the question #1, what would be the head if the pump speed remains the same? A. 22.7 ft B. 35.7 ft C. 60.0 ft D. None of above 3. Same as the question #1, what is the expected input power if the pump speed remains the same? A. 24.1 hp B. 38.1 hp C. 60.0 hp D. Cannot be determined from the data given. 4. A pump station is used to fill a tank on a hill using water from a lake. The flow rate is 10.5 L/s and atmospheric pressure is 101 KPa (abs). The pump is located 4 m above the lake, and the tank surface level is 115 m above the pump. The suction and discharge lines are 10.2 cm diameter commercial steel pipe. The equivalent length of the inlet line between the lake and the pump is 100m. The total equivalent length between the lake and the tank is 2300 m, including all fittings, bends, screens, and valves. The overall efficiency of the pump and motor set is 70%. What is the NPSH available for this pump, if vapor pressure is 1.82 KPa? A. 3.2 m B. 4.4 m C. 4.7 m D. None of above
CIVL 315 5. A small pump, when tested at 2875 rpm with water, delivered a flow rate of 252 gpm and a head of 138 ft at its best efficiency point (efficiency is 76%). Determine the specific speed of the pimp at this test condition. A. 630 B. 1130 C. 3130 D. 8350 6. Same as the question #5, specify the type of this pump. A. Radial flow pump B. Mixed flow pump C. Axial flow pump D. None of above 7. Same as the question #5, compute the required power input to this pump. A. 11.6 hp B. 16.6 hp C. 21.6 hp D. None of above
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CIVL 315 8. Water is to be pumped from one large open tank to a second large open tank. The pipe diameter throughout is 6 in. and the total length of the pipe between the pipe entrance and exit is 200 ft. Minor loss coefficients for the entrance, exit, and the elbow are shown on the figure and the friction factor can be assumed constant which is f = 0.02. A certain centrifugal pump having the performance characteristics shown is suggested as a good pump for this flow system. What is the flow rate between the tanks? A. ~ 1200 gpm B. ~1600 gpm C. ~2000 gpm D. None of above 9. For the previous question #8, the choice of this pump would be a good one? A. Yes B. No C. Maybe D. I do not care
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