Fluid Mechanics — Part 2 MCQs with Explanations

Increases linearly is the correct answer to “With the increase in depth, the hydrostatic pressure in an unaccelerated incompressible fluid (in a constant gravitational field)”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Pitot tube is the correct answer to “Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Closed is the correct answer to “While starting a centrifugal pump, its delivery valve should be kept”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Open is the correct answer to “While starting an axial flow pump, its delivery valve should be kept”. This question is standard in competitive examination syllabi for Fluid Mechanics.

All of the above is the correct answer to “Pressure drag does not depend upon the”. This question is standard in competitive examination syllabi for Fluid Mechanics.

x is the correct answer to “The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by (where, x = each side of the square duct)”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Reciprocating pump is the correct answer to “Which of the following is the most common pump for pumping either raw sewage or sludge”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Tungsten is the correct answer to “The resistance wire used in a hot wire anemometer for conducting electrical current is made of”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Manometric is the correct answer to “Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the __________ head.”. This question is standard in competitive examination syllabi for Fluid Mechanics.

> 4 is the correct answer to “The Mach number for hypersonic flow of compressible fluid is”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Hot wire annemometer is the correct answer to “Which of the following is used for very accurate measurement of flow of gas at low velocity”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Vmax = 2Vav is the correct answer to “For laminar flow through a closed conduit”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Is zero at the centre and varies linearly with the radius is the correct answer to “Shear stress in a fluid flowing in a round pipe”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Venturimeter occupies less space than an orificemeter is the correct answer to “Select the wrong statement pertaining to flow of an incompressible fluid through a venturimeter.”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Decrease is the correct answer to “Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will”. This question is standard in competitive examination syllabi for Fluid Mechanics.

16 mm/s is the correct answer to “A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 x 10 3 V OM + 10.94 x 10 6 V 2 OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, V OM is”. This question is standard in competitive examination syllabi for Fluid Mechanics.

All of the above is the correct answer to “A venturimeter can not be used for the direct measurement of”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Compressors is the correct answer to “Which of the following produces maximum pressure difference for transportation of gases”. This question is standard in competitive examination syllabi for Fluid Mechanics.

11 m is the correct answer to “A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D. of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m 3 /s? The Fanning friction factor, f is 0.0062.”. This question is standard in competitive examination syllabi for Fluid Mechanics.

I.D. is the correct answer to “The nominal size of a hose pipe is specified by its”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Both A & B is the correct answer to “Rise of liquid in a capillary tube is due to”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Having no motion of one fluid layer relative to the other is the correct answer to “The normal stress is the same in all directions at a point in a fluid, when the fluid is”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Save power in compressing a given volume to a given pressure is the correct answer to “Interstage coolers are provided in a multistage compressor to”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Protect the pump against developing excessive pressure is the correct answer to “Purpose of relief valve in a reciprocating pump is to”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Reduce discharge fluctuation is the correct answer to “Function of air vessel provided in a reciprocating pump is to”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Temperature is the correct answer to “The speed of sound in an ideal gas varies as the”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Sudden expansion of flow in the downstream occurs is the correct answer to “The energy loss in flow through ven-turimeter is less than that through flow nozzle, because in case of a flow nozzle, the”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Both A & B is the correct answer to “Velocity at a certain point in case of streamline flow is”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Non-uniform is the correct answer to “In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant”. This question is standard in competitive examination syllabi for Fluid Mechanics.

5.657 is the correct answer to “If the head over the triangular notch is doubled, the discharge will increase by __________ times.”. This question is standard in competitive examination syllabi for Fluid Mechanics.

U-bend is the correct answer to “Which of the following pipe bends will incur the largest head loss”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Newtonion is the correct answer to “The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a __________ fluid.”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Centre of gravity is the correct answer to “The distance between metacentre and __________ is called metacentric height.”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Static is the correct answer to “The __________ pressure is measured by a static tube.”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Multistage centrifugal is the correct answer to “Boiler feed water pump is usually a __________ pump.”. This question is standard in competitive examination syllabi for Fluid Mechanics.

$$\frac{{\text{Q}}}{{16}}$$ is the correct answer to “Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Avoid priming, every time we start the pump is the correct answer to “Foot valves are provided in the suction line of a centrifugal pump to”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Gear is the correct answer to “Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics.”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Lower cross-section is the correct answer to “Lower BWG means __________ of the tube.”. This question is standard in competitive examination syllabi for Fluid Mechanics.

Both A and B is the correct answer to “In magnetic flow meters, voltage generation is”. This question is standard in competitive examination syllabi for Fluid Mechanics.