PracticeQuestions-Midterm-II

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California State University, Long Beach *

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335

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English

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May 16, 2024

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pdf

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5

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- 1 - Midterm-II Practice Questions Problem 1: The gate of negligible weight is used to hold back water in a channel of width b as shown in the figure. Find the reaction force on the block? [ Ans: F R =0.389 γ bh 2 ] Problem 2: A 3-m-diameter open cylindrical tank contains water and has a hemispherical bottom as shown in the figure. Determine the magnitude, line of action, and direction of the force of the water on the curved bottom. [ Ans: 485 kN] Problem 3: A plug in the bottom of a pressurized tank is conical in shape, as shown in the figure. The air pressure is 40 kPa, and the liquid in the tank has a specific weight of 27 kN/m 3 . Determine the magnitude, direction, and line of action of the force exerted on the curved surface of the cone within the tank due to the 40 kPa pressure and the liquid. [ Ans: 117 kN]
- 2 - Problem 4: A closed tank is filled with water and has a 4-ft-diameter hemispherical dome as shown in the figure below. A U-tube manometer is connected to the tank. Determine the vertical force of the water on the dome if the differential manometer reading is 7 ft and the air pressure at the upper end of the manometer is 12.6 psi. [ Ans: 35,100 lb ↑ ] Problem 5: Water is siphoned from the tank shown in the figure. The water barometer indicates a reading of 30.2 ft. Determine the maximum value of h without cavitation occurring. Note: the pressure of the vapor in the closed end of the barometer equals the vapor pressure. [ Ans: h = 3.13 ft]
- 3 - Problem 6: Water is siphoned from a tank as shown. Find the flowrate and pressure at point A, a stagnation point. [Ans: Q = 9.64×10 -3 m 3 /s; P A = 29.4 kPa] Problem 7: Water is siphoned from the tank as shown. Find the flowrate from the tank and pressure at points (1), (2), and (3). [ Ans: Q = 0.303 ft 3 /s; P 1 = 499 psf; P 2 = 312 psf; P 3 = -187 psf] Problem 8: Oil of specific gravity of 0.83 flows in the pipe as shown. What is the flowrate? [ Ans: 0.183 ft 3 /s]
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