Tiêu đề CE 3135 QUIZ 4 Retake.pdf ✅

“But seek first the kingdom of God and His righteousness, and all these things will be added to you.” Matthew 6:33 "We learned about honesty and integrity - that the truth matters... that you don't take shortcuts or play by your own set of rules... and success doesn't count unless you earn it fair and square." – Michelle Obama CE 3135 QUIZ 4 NAME: ________________________ SC: _______________ SCORE: ___________ INSTRUCTIONS: 1. SHOW ORGANIZED SOLUTIONS and BOX YOUR FINAL ANSWERS. WRITE YOUR FINAL ANSWER IN THE QUESTIONNAIRE. 2. ROUND OFF YOUR ANSWERS TO AT LEAST 3 DECIMAL POINTS, AVOID ERASURES TO YOUR FINAL ANSWERS. 1. A 7 cm fire hose discharges water through a nozzle having a jet diameter of 3.5 cm. The head lost in the nozzle is 8% of the velocity head in the jet. If the gage pressure at the base of the nozzle is 450 kPa, find the flow in li/sec of the water. For maximum horizontal range the jet must form an angle of 450 .The vertical distance between point 1 and 2 is negligible. ______________________ 2. A pitot tube in a pipe in which air is flowing is connected to a manometer containing water. If the difference in water levels in the manometer is 12 cm, what is the velocity of flow in the pipe, assuming a tube coefficient of 0.95? Specific weight of air is 15 N/m3 . _________________________ 3. A 30 cm by 15 cm Venturi meter is installed in a vertical pipe carrying water, as shown. The flow is upward through the meter. A differential manometer containing a liquid (sg = 1.50) is attached to inlet and throat, the deflection being 80 cm. Determine the flow in li/sec if C = 0.95. _______________________ 4. A vertical cylindrical tank has an orifice in its side at a point 0.60 m above the bottom. If the discharge reduces the depth of water in the tank from 6 m to 4 m in 68 sec, what time is required to reduce the depth from 3.6 m to 1.6 m? ________________________ 5. A garden hose attached with a nozzle is used to fill a 20-gal bucket. The inner diameter of the hose is 1 in and it reduces to 0.5 in at the nozzle exit. If the average velocity in the hose is 8 ft/s, determine (a) the volume and mass flow rates of water through the hose __________________ (b) how long it will take to fill the bucket with water __________________ (c) the average velocity of water at the nozzle exit. __________________ 6. Water is pumped from a lake to a storage tank 20 m above at a rate of 70 L/s while consuming 20.4 kW of electric power. Disregarding any frictional losses in the pipes and any changes in kinetic energy, determine (a) the overall efficiency of the pump–motor unit __________________ (b) the pressure difference between the inlet and the exit of the pump. _________________ 7. A pressurized tank of water has a 10-cm-diameter orifice at the bottom, where water discharges to the atmosphere. The water level is 3 m above the outlet. The tank air pressure above the water level is 300 kPa (absolute) while the atmospheric pressure is 100 kPa. Neglecting frictional effects, determine the initial discharge rate of water from the tank. _____________________ 8. The water level in a tank is 20 m above the ground. A hose is connected to the bottom of the tank, and the nozzle at the end of the hose is pointed straight up. The tank cover is airtight, and the air pressure above the water surface is 2 atm gage. The system is at sea level. Determine the maximum height to which the water stream could rise. ______________________ 9. A tank circular in cross section is 10 m high. It takes 8.4 minutes to empty it thru a hole at the bottom when the tank is full of water at the start. How long will it take for the water level to drop the upper 3 m? ____________________