If one-third of the air in a tank is removed by each stroke of an air pump, what is the fractional part of the total air is removed in 6 strokes? Group of answer choices
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If one-third of the air in a tank is removed by each stroke of an air pump, what is the fractional part of the total air is removed in 6 strokes?
Group of answer choices
525/765
335/765
665/729
786/766
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- No. 1: A water system of 2 inches (inside diameter) pipe, having a length of 1/4mile, is to be flushed with a volume of water equal to twice that contained in the system. How much water (number of gallons) must be flushed through the system. (1??3 = 7.481 ???????)What is the function of the empty pipes that connect from the sanitary/drainage pipes up through the roof of a building?Water enters through a 500 mm diameter inlet pipe under a pressure of 15 kPa. It leaves through a 1000 mm diameter exhaust pipe with a pressure of 5 kPa. If the center of the outlet pipe is 3 m above the center of the inlet pipe and 500 L/sec of water passes a motor or pump. Which of the following most nearly gives the specific gravity of the block? a. 1.6320 b. 0.6814c. 0.3196 d. 1.3186
- The "point of no pressure change" is located at the A. outlet of the circulator pump. B. inlet of the expansion tank. C. inlet of the pressure-reducing valve. D. outlet of the pressure relief valve.1. Which of the following is used to increase flow velocity from a pipe?Group of answer choices Venturimeter Orifice Nozzle Pitot tube 2. Which of the following is normally used for very large discharge flow measurements?Group of answer choices Nozzle Orifice Venturimeter Pitot tubeThe power developed by the pump is 30kw. What is the percent decrease in power if speed will decrease by 40%. ANSWER: 78.4%
- In the pump performance curve, the point at which the net head is zero is called (a) Best efficiency point (b) Free delivery (c) Shutoff head (d) Operating point (e) Duty pointFor each statement, choose whether the statement is true or false, and discuss your answer briefly: (a) If the rpm of a pump is doubled, all else staying the same, the capacity of the pump goes up by a factor of about 2. (b) If the rpm of a pump is doubled, all else staying the same, the net head of the pump goes up by a factor of about 2. (c) If the rpm of a pump is doubled, all else staying the same, the required shaft power goes up by a factor of about 4. (d) If the rpm of a turbine is doubled, all else staying the same, the output shaft power of the turbine goes up by a factor of about 8.turbine flow
- 1-If the combination of pump and motor is 80% efficient, how much electrical power (kW) is needed to drive the pump? 2• If, in order to avoid vapour lock, the pressure in the pipeline must always be above the vapor pressure of the crude oil, what is the maximum permissible elevation of point 3 relative to point 4? 3• If the flow in the pipeline were at the upper limit of being laminar, what pump exit pressure would then be needed? (Answer this part without using the friction factor plot.What is the impact on flow and pressure when the impeller of a pump is trimmed? a. Flow decreases with increased pressure c. Both flow and pressure decrease b. Both flow and pressure increase d. None of the aboveWhich is correct? The pressure ratio of a gas turbine engine compressor is: - equal to the number of compression stages - the ratio between compressor outlet and compressor inlet pressure - the ratio between exhaust inlet and exhaust outlet pressure - never greater than 5 to 1