MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
%_The distribution of shear stress in a stream of fluid in a circular tube is_% |
| A. | Linear with radius for turbulent flow only |
| B. | Linear with radius for laminar flow only |
| C. | Linear with radius for both laminar & turbulent flow |
| D. | Parabolic with radius for both laminar & turbulent flow |
| Answer» D. Parabolic with radius for both laminar & turbulent flow | |
| 2. |
%_One dimensional flow implies_% |
| A. | Flow in a straight line |
| B. | Steady uniform flow |
| C. | Unsteady uniform flow |
| D. | A flow which does not account for changes in transverse direction |
| Answer» E. | |
| 3. |
%_Diaphragm valves are used for handling __________ fluids._% |
| A. | Corrosive |
| B. | Viscous |
| C. | Non-Newtonion |
| D. | Solid suspended |
| Answer» B. Viscous | |
| 4. |
%_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._% |
| A. | Small differential |
| B. | Atmospheric |
| C. | Absolute |
| D. | Gage |
| Answer» B. Atmospheric | |
| 5. |
%_The flow of gas along a pipe in the direction of decreasing pressure causes decrease in its_% |
| A. | Viscosity |
| B. | Specific volume |
| C. | Velocity |
| D. | None of these |
| Answer» C. Velocity | |
| 6. |
%_The Prandtl pitot tube measures the_% |
| A. | Velocity at a point in the flow |
| B. | Pressure at a point |
| C. | Average flow velocity |
| D. | Pressure difference in pipe flow |
| Answer» B. Pressure at a point | |
| 7. |
%_The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for __________ fluid._% |
| A. | Newtonion |
| B. | Dilatant |
| C. | Pseudoplastic |
| D. | Non-Newtonion |
| Answer» B. Dilatant | |
| 8. |
%_Purpose of air lift pump is to_% |
| A. | Compress air |
| B. | Lift compressed air |
| C. | Lift water from a well by using compressed air |
| D. | Lift air under negative pressure |
| Answer» D. Lift air under negative pressure | |
| 9. |
%_Pipes having diameter 14 inches or more are designated by their_% |
| A. | Outside diameter |
| B. | Inside diameter |
| C. | Schedule number |
| D. | None of these |
| Answer» B. Inside diameter | |
| 10. |
%_Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the_% |
| A. | Wall roughness |
| B. | Reynolds number |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 11. |
_ Boiler feed water pump is usually a __________ pump.$? |
| A. | Reciprocating |
| B. | Gear |
| C. | Multistage centrifugal |
| D. | Diaphragm |
| Answer» D. Diaphragm | |
| 12. |
_ If the head over the triangular notch is doubled, the discharge will increase by __________ times.$? |
| A. | 2 |
| B. | 2.828 |
| C. | 5.657 |
| D. | 4 |
| Answer» D. 4 | |
| 13. |
_ The speed of sound in an ideal gas varies as the$? |
| A. | Temperature |
| B. | Pressure |
| C. | Density |
| D. | None of these |
| Answer» B. Pressure | |
| 14. |
_ Rise of liquid in a capillary tube is due to$? |
| A. | Cohesion |
| B. | Adhesion |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 15. |
_ 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 10³ VOM + 10.94 x 10⁶ V²OM (SI units)If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is$? |
| A. | 12 mm/s |
| B. | 16 mm/s |
| C. | 24 mm/s |
| D. | 28 mm/s |
| Answer» C. 24 mm/s | |
| 16. |
_ In deriving Bernoulli's equation, fluid is assumed to be$? |
| A. | Incompressible, frictionless, steady, along a streamline |
| B. | Uniform, steady, incompressible, along a streamline |
| C. | Steady, density being pressure dependent, frictionless |
| D. | None of these |
| Answer» B. Uniform, steady, incompressible, along a streamline | |
| 17. |
_ Design of the casing of centrifugal pump should be such as to minimise the$? |
| A. | Back flow through impeller |
| B. | Loss of kinetic head |
| C. | Loss of static head |
| D. | None of these |
| Answer» C. Loss of static head | |
| 18. |
_ Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg.$? |
| A. | 1 |
| B. | 0.1 |
| C. | 0.01 |
| D. | 0.001 |
| Answer» D. 0.001 | |
| 19. |
_ Path followed by water jet issuing from the bottom of a water tank will be a$? |
| A. | Parabola (vertex being at the opening) |
| B. | Hyperbola |
| C. | Horizontal straight line |
| D. | Zig-zag path (which is geometrically undefined) |
| Answer» B. Hyperbola | |
| 20. |
_ Volume of liquid displaced by a floating body is equivalent to its$? |
| A. | Own weight |
| B. | Submerged weight |
| C. | Own volume |
| D. | Submerged volume |
| Answer» B. Submerged weight | |
| 21. |
_ Terminal velocity is$? |
| A. | A constant velocity with no acceleration |
| B. | A fluctuating velocity |
| C. | Attained after moving one-half of total distance |
| D. | None of these |
| Answer» B. A fluctuating velocity | |
| 22. |
_ The unit of velocity head is$? |
| A. | ft-lb/sec |
| B. | ft-lb/ft³ |
| C. | ft-lbf/lb |
| D. | ft-lbf/sec |
| Answer» D. ft-lbf/sec | |
| 23. |
_ The lift of a ballon is$? |
| A. | Increased, as it rises to a higher altitude |
| B. | Due to the weight of the atmospheric air, that it displaces |
| C. | Not dependent on the temperature of the atmosphere |
| D. | None of these |
| Answer» C. Not dependent on the temperature of the atmosphere | |
| 24. |
_ The equation given below is called the __________ . f-0.5 = 4.07 loge (NRe‚à öf)-0.6$? |
| A. | Colebrook formula |
| B. | Von-Karman equation |
| C. | Fanning equation |
| D. | None of these |
| Answer» C. Fanning equation | |
| 25. |
_ Permanent pressure loss in a well designed venturimeter is about __________ percent of the venturi differential.$? |
| A. | 1 |
| B. | 10 |
| C. | 30 |
| D. | 50 |
| Answer» C. 30 | |
| 26. |
_ The peripherial velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec.$? |
| A. | 1.8 |
| B. | 12.4 |
| C. | 186.2 |
| D. | 736.4 |
| Answer» C. 186.2 | |
| 27. |
_ The time of oscillation of a floating body is$? |
| A. | Longer, if metacentric height is increased |
| B. | Independent of the metacentric height |
| C. | Dependent on the buoyant forces only |
| D. | None of these |
| Answer» E. | |
| 28. |
_ In a free vortex, the$? |
| A. | Velocity changes linearly with radial distance |
| B. | Flow is necessarily rotational |
| C. | Radial component of velocity is same everywhere |
| D. | Stream lines are not circular |
| Answer» B. Flow is necessarily rotational | |
| 29. |
_ Weber number is the ratio of inertial force to __________ force.$? |
| A. | Surface tension |
| B. | Gravity |
| C. | Viscous |
| D. | Elastic |
| Answer» B. Gravity | |
| 30. |
_ Vena-contracta formed during flow of a liquid through an orificemeter has$? |
| A. | Minimum liquid cross-section |
| B. | More diameter compared to orifice diameter |
| C. | Minimum velocity of fluid stream |
| D. | None of these |
| Answer» B. More diameter compared to orifice diameter | |
| 31. |
_ The line of action of the buoyant force passes through the centre of gravity of the$? |
| A. | Submerged body |
| B. | Displaced volume of the fluid |
| C. | Volume of fluid vertically above the body |
| D. | Horizontal projection of the body |
| Answer» C. Volume of fluid vertically above the body | |
| 32. |
_ Stoke's law is valid, when the particle Reynolds number is$? |
| A. | < 1 |
| B. | > 1 |
| C. | < 5 |
| D. | None of these |
| Answer» B. > 1 | |
| 33. |
_ Pick out the wrong statement pertaining to fluid flow.$? |
| A. | The ratio of average velocity to the maximum velocity for turbulent flow of Newtonion fluid in circular pipes is 0.5 |
| B. | The Newtonion fluid velocity in a circular pipe flow is maximum at the centre of the pipe |
| C. | Navier-Stokes equation is applicable to the analysis of viscous flows |
| D. | Hagen-Poiseuille equation is applicable to the laminar flow of Newtonion fluids |
| Answer» B. The Newtonion fluid velocity in a circular pipe flow is maximum at the centre of the pipe | |
| 34. |
_ A streamline is a line in flow field,$? |
| A. | That is traced by all the fluid particles passing through a given point |
| B. | Along which a fluid particle travels |
| C. | Such that at every point on it, the velocity is tangential to it |
| D. | None of these |
| Answer» D. None of these | |
| 35. |
_ Forces acting on a particle settling in fluid are __________ forces.$? |
| A. | Gravitational & buoyant |
| B. | Centrifugal & drag |
| C. | Gravitational or centrifugal buoyant drag |
| D. | External, drag & viscous |
| Answer» D. External, drag & viscous | |
| 36. |
_ Baffles in mixing tanks are provided to$? |
| A. | Reduce swirling and vortex formation |
| B. | Increase the structural strength of the tank |
| C. | Aid in rotational flow |
| D. | None of these |
| Answer» B. Increase the structural strength of the tank | |
| 37. |
_ In a/an __________ , the flow rate of fluids is obtained by measuring the difference between the impact and the static pressure.$? |
| A. | Rotameter |
| B. | Pitot tube |
| C. | Venturimeter |
| D. | Flow nozzle |
| Answer» C. Venturimeter | |
| 38. |
_ Theoretical head developed by a centrifugal pump does not depend upon the __________ the impeller.$? |
| A. | Radius of |
| B. | Speed of |
| C. | Fluid velocity leaving |
| D. | None of these |
| Answer» E. | |
| 39. |
_ What is the speed of sound (m/sec) in ordinary water?$? |
| A. | 1500 |
| B. | 330 |
| C. | 1000 |
| D. | 3000 |
| Answer» B. 330 | |
| 40. |
_ All pipes of a particular nominal size have the same$? |
| A. | Inside diameter |
| B. | Outside diameter |
| C. | Thickness |
| D. | None of these |
| Answer» C. Thickness | |
| 41. |
_ In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is$? |
| A. | The velocity of sound |
| B. | Dependent on its cross-sectional area |
| C. | Dependent on fluid viscosity |
| D. | Dependent on fluid density |
| Answer» B. Dependent on its cross-sectional area | |
| 42. |
_ For steady ideal fluid flow, the Bernoulli's equation states that the$? |
| A. | Velocity is constant along a stream line |
| B. | Energy is constant throughout the fluid |
| C. | Energy is constant along a stream line, but may vary across stream lines |
| D. | None of these |
| Answer» D. None of these | |
| 43. |
_ The rate of shear versus the shear stress curves are time dependent for __________ fluid.$? |
| A. | Thixotropic |
| B. | Rheopectic |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 44. |
_ A fluid whose apparent viscosity increases with shear rate is termed as the __________ fluid.$? |
| A. | Newtonion |
| B. | Viscous |
| C. | Dilatant |
| D. | Non-viscous |
| Answer» D. Non-viscous | |
| 45. |
_ Pressure drop in packed bed for turbulent flow is given by the __________ equation.$? |
| A. | Kozney-Karman |
| B. | Blake-Plummer |
| C. | Leva's |
| D. | Hagen-Poiseulle's |
| Answer» C. Leva's | |
| 46. |
_ The energy equation, E + P/ρ + V²/2g +gZ (E = internal energy/mass), is applicable to$? |
| A. | Perfect gases only |
| B. | Isothermal flow of gases |
| C. | Adiabatic unsteady flow of gases |
| D. | All of the above |
| Answer» E. | |
| 47. |
_ Drag is defined as the force exerted by the$? |
| A. | Fluid on the solid in a direction opposite to flow |
| B. | Fluid on the solid in the direction of flow |
| C. | Solid on the fluid |
| D. | None of these |
| Answer» C. Solid on the fluid | |
| 48. |
_ Which of the following relationship is valid for the equilibrium position of the float in a rotameter ?(where, Df= Drag force on the float Bf = Buoyant force on the float Wf = Weight of the float)$? |
| A. | Df + Bf = Wf |
| B. | Df = Bf + Wf |
| C. | Df + Bf + Wf =0 |
| D. | None of these |
| Answer» B. Df = Bf + Wf | |
| 49. |
_ During ageing of fluid carrying pipes, the$? |
| A. | Pipe becomes smoother with use |
| B. | Friction factor increases linearly with time |
| C. | Absolute roughness decreases with time |
| D. | Absolute roughness increases linearly with time |
| Answer» E. | |
| 50. |
_ What is the shear rate at the pipe wall, in case of laminar flow of Newtonion fluids in a pipe of diameter 'D' & length 'L' incurring a pressure drop 'Δp' with average velocity 'Vavg'?$? |
| A. | D Δp/8L |
| B. | D Δp/4L |
| C. | 8 . Vavg/D |
| D. | 4 . Vavg/D |
| Answer» D. 4 . Vavg/D | |