0% 0 Fluid Mechanics for Chemical Quiz 15 1 / 28 Which of the following quantities are computed by using the hydraulic radius for noncircular ducts ? Reynold number, relative roughness and head loss Reynolds number and friction factor Velocity and relative roughness Head loss and velocity 2 / 28 With increasing flow rate, the hydraulic efficiency of a centrifugal pump___________? Increases and then decreases Decreases and then increases Monotonically decreases Remains constant 3 / 28 Which of the following two quantities when same, makes one pipe system equivalent to another pipe system ? Length & diameter Friction factor & diameter Length & discharge Head & discharge 4 / 28 Which of the following relationship is valid for the equilibrium position of the float in a Rotameter? (Where, Df= Drag force on the float Bf = Buoyant force on the float Wf = Weight of the float)? Df = Bf + Wf Df + Bf = Wf Df + Bf + Wf =0 None of these 5 / 28 With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the______? Neither A. nor B. Both A. & B. Pressure decreases Velocity increases 6 / 28 With the increase in depth, the hydrostatic pressure in an un-accelerated incompressible fluid (in a constant gravitational field) ? Decreases Remain constant Increases linearly Increases exponentially 7 / 28 With increase in the temperature, viscosity of a liquid______? May increase or decrease; depends on the liquid Decreases Remain constant Increases 8 / 28 Which of the following properties of a fluid is responsible for offering resistance to shear ? Viscosity All A., B., and C. Surface tension Specific gravity 9 / 28 With increase in temperature, the vapor pressure of liquids___________? Increases linearly Decreases Remain constant Increases 10 / 28 Which of the following is used for very accurate measurement of flow of gas at low velocity ? Pitot tube Rotameter Segmental orificemeter Hot wire anemometer 11 / 28 With increase in molecular weight of the gas, the head developed by a centrifugal compressor will_________? Decrease Unpredictable Increase Remain same 12 / 28 While starting an axial flow pump, its delivery valve should be kept ________? Either open or closed Open None of these Closed 13 / 28 Working of a ________ pump characterises mixed flow? None of these Piston Turbine Diaphragm 14 / 28 Which of the following produces maximum pressure difference for transportation of gases ? Vacuum pumps Compressors Blowers Fans 15 / 28 With increase in the ratio of orifice diameter to pipe diameter in case of an orificemeter, the overall pressure loss________? Remain constant Increases linearly Decreases Increases 16 / 28 With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost_________? Decreases Remains unchanged Increases Increases exponentially 17 / 28 Which of the following may be termed as a variable orifice flow-meter ? All A., B. and C. Rotameter Pitot tube V-notch 18 / 28 With a constant diameter impeller of a centrifugal pump _______? Head varies as the speed Head varies as the square of speed Horsepower input varies as the square of speed Its capacity varies directly as the square of speed 19 / 28 Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump ? Mounting of two or more impellers in series on a single shaft Either of A., B. or C. Increasing the number of vanes in the impeller Increasing the impeller speed and the volute area 20 / 28 With decrease in particle size to be fluidised by a particular fluid, the operating range of fluidisation velocity_____? Squeezes Does not change Widens Unpredictable from the data 21 / 28 Which of the following is used for pumping crude oil from oil well ? Screw pump Duplex/triplex reciprocating pump Single stage centrifugal pump Gear pump 22 / 28 With increase in pump speed, its NPSH requirement__________? Decreases Remains unaltered Increases Can either increase or decrease; depends on other factors 23 / 28 Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newton?s law of viscosity. (II) Newton?s second law of motion. (III) The continuity equation. (IV) Velocity of boundary layer must be zero relative to boundary. (V) Fluid cannot penetrate a boundary? II, III, V I, II, III I, II, V II, IV, V 24 / 28 While starting a centrifugal pump, its delivery valve should be kept_____? Either opened or closed; depending on the fluid viscosity Closed Opened Either opened or closed; it does not make any difference 25 / 28 Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of _______ pressure? Small differential Atmospheric Absolute Gage 26 / 28 Which of the following pipe bends will incur the largest head loss ? 45? bend 90? bend 30? bend U-bend 27 / 28 With increase in the shear rate, the apparent viscosity of pseudo-plastic fluids___________? Increases Remain same Decreases May increase or decrease; depends on the magnitude of shear rate 28 / 28 Which of the following valves will incur maximum pressure drop for the same discharge of water ? Gate valve Globe valve Needle valve Butterfly valve Provide Your Information Your score is The average score is 0% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevFluid Mechanics for Chemical Quiz 14 Fuels and Combustion Quiz 1Next
