A jet aircraft flies at a speed of 550 mph at an altitude of 35 000 ft., where the temperature is -66deg F. Determine the ratio of the aircraft, v to that of the speed of sound, c at the specified altitude. Assume k=1.40.
Answer
13.71
11.91
0.829
0.874
Question 2
Question
Two water streams at 15 °C, one flowing at 3 kg s -1 and another flowing at 2 kg s -1 , discharge into a tank at steady state. The tank has an exit pipe (inside diameter = 100 mm), which is connected to a horizontally oriented nozzle that discharges the water through a tube with an inside diameter of 4 mm. What is the flow rate of the water stream in the tube after it passes the nozzle (ft/s).
Answer
1306.8 ft/s
0.016 ft/s
0.1306 ft/s
16.02 ft/s
Question 3
Question
What will be the rated capacity (gpm) of a 5 inch diameter impeller centrifugal pump operating at a speed of 3450 rpm capable of generating a head of 80 ft. water?
Answer
111
222
44
123
Question 4
Question
What is the power requirement of a fan in kW in order to supply air at a rate of 1500 m3/hr at a total discharge pressure of 10.35 kPa?
Answer
0.431
43.1
4.31
0.0431
Question 5
Question
A differential pressure gauge is connected across the taps of a pitot tube. When this pitot tube is used in wind tunnel test the gauge indicates a change in pressure of 730 Pa. What is the air velocity in the tunnel given that the pressure and temperature in the tunnel are 98 kPa and 20 deg Celsius
Answer
0.353 m/s
353 m/s
3.53 m/s
35.3 m/s
Question 6
Question
A venture meter is to be installed in a 100 mm diameter pipe to measure the flow of water. The maximum flow rate is expected to be 75m3/hr at 15deg C. The manometer used to measure the differential pressure is to be filled with mercury and water, is to fill the leads above the surfaces of the mercury. The water temperature will be 15 deg C throughout. If the maximum manometer reading is to be 1.25 m and the venture coefficient is 0.98. What throat diameter(mm) should be specified for the venturi?
Answer
39.2
0.39
3.9
0.0392
Question 7
Question
Water is pumped to the top of a covered tank, elevated 50 m from the centerline of the pump. If the water entered the pump at a pressure of 100 kPa through a 2-inch sch. 40 steel pipe and delivered at 350 kPa through the same pipe size to the elevated tank, how long will it take for the 2-horsepower pump to fill the 20-m 3 tank?
Answer
0.0275 h
16.6 min
0.275 h
165. 22 min
Question 8
Question
Pick out the wrong statement.
Answer
The form drag is dependent upon the occurrence of a wake.
The shear stress at any given cross-section of a pipe for steady flow (either laminar or turbulent) varies linearly as the radial distance.
Existence of the boundary layer in fluid flow is because of viscosity of the fluid
An ideal fluid is the one, which has negligible surface tension and obeys the Newton's law of viscosity.
Question 9
Question
The ratio of inertial forces to elastic forces is called the __________ number.
Answer
Reynolds
Euler
Mach
Weber
Question 10
Question
Theoretical head developed by a centrifugal pump does not depend upon the __________ the impeller.