MCQOPTIONS
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MCQOPTIONS
This section includes 659 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
While starting a centrifugal pump, its delivery valve should be kept___________________? |
| A. | Opened |
| B. | Closed |
| C. | Either opened or closed; it does not make any difference |
| D. | Either opened or closed; depending on the fluid viscosity |
| Answer» C. Either opened or closed; it does not make any difference | |
| 2. |
While starting an axial flow pump, its delivery valve should be kept _______________? |
| A. | Open |
| B. | Closed |
| C. | Either open or closed |
| D. | None of these |
| Answer» B. Closed | |
| 3. |
With a constant diameter impeller of a centrifugal pump _____________________? |
| A. | Its capacity varies directly as the square of speed |
| B. | Head varies as the square of speed |
| C. | Horsepower input varies as the square of speed |
| D. | Head varies as the speed |
| Answer» C. Horsepower input varies as the square of speed | |
| 4. |
With decrease in particle size to be fluidised by a particular fluid, the operating range of fluidisation velocity___________________? |
| A. | Widens |
| B. | Squeezes |
| C. | Does not change |
| D. | Unpredictable from the data |
| Answer» D. Unpredictable from the data | |
| 5. |
With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the____________________? |
| A. | Velocity increases |
| B. | Pressure decreases |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 6. |
With increase in molecular weight of the gas, the head developed by a centrifugal compressor will________________? |
| A. | Decrease |
| B. | Increase |
| C. | Remain same |
| D. | Unpredictable |
| Answer» B. Increase | |
| 7. |
With increase in pump speed, its NPSH requirement_________________? |
| A. | Decreases |
| B. | Increases |
| C. | Remains unaltered |
| D. | Can either increase or decrease; depends on other factors |
| Answer» C. Remains unaltered | |
| 8. |
With increase in temperature, the vapor pressure of liquids__________________? |
| A. | Increases |
| B. | Increases linearly |
| C. | Decreases |
| D. | Remain constant |
| Answer» B. Increases linearly | |
| 9. |
With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Increases exponentially |
| Answer» C. Remains unchanged | |
| 10. |
With increase in the ratio of orifice diameter to pipe diameter in case of an orificemeter, the overall pressure loss_______________? |
| A. | Decreases |
| B. | Increases |
| C. | Remain constant |
| D. | Increases linearly |
| Answer» D. Increases linearly | |
| 11. |
With increase in the shear rate, the apparent viscosity of pseudo-plastic fluids__________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | May increase or decrease; depends on the magnitude of shear rate |
| Answer» C. Remain same | |
| 12. |
With increase in the temperature, viscosity of a liquid____________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | May increase or decrease; depends on the liquid |
| Answer» C. Remain constant | |
| 13. |
With increasing flow rate, the hydraulic efficiency of a centrifugal pump__________________? |
| A. | Monotonically decreases |
| B. | Decreases and then increases |
| C. | Remains constant |
| D. | Increases and then decreases |
| Answer» B. Decreases and then increases | |
| 14. |
With the increase in depth, the hydrostatic pressure in an un-accelerated incompressible fluid (in a constant gravitational field) ? |
| A. | Decreases |
| B. | Increases linearly |
| C. | Increases exponentially |
| D. | Remain constant |
| Answer» C. Increases exponentially | |
| 15. |
Working of a _______________ pump characterises mixed flow? |
| A. | Turbine |
| B. | Piston |
| C. | Diaphragm |
| D. | None of these |
| Answer» B. Piston | |
| 16. |
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 | |
| 17. |
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 | |
| 18. |
Which of the following quantities are computed by using the hydraulic radius for noncircular ducts ? |
| A. | Velocity and relative roughness |
| B. | Head loss and velocity |
| C. | Reynold number, relative roughness and head loss |
| D. | Reynolds number and friction factor |
| Answer» D. Reynolds number and friction factor | |
| 19. |
Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump ? |
| A. | Increasing the impeller speed and the volute area |
| B. | Increasing the number of vanes in the impeller |
| C. | Mounting of two or more impellers in series on a single shaft |
| D. | Either of A., B. or C. |
| Answer» D. Either of A., B. or C. | |
| 20. |
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? |
| A. | I, II, III |
| B. | II, III, V |
| C. | I, II, V |
| D. | II, IV, V |
| Answer» C. I, II, V | |
| 21. |
Which of the following may be termed as a variable orifice flow-meter ? |
| A. | Rotameter |
| B. | Pitot tube |
| C. | V-notch |
| D. | All A., B. and C. |
| Answer» B. Pitot tube | |
| 22. |
Which of the following is the „Blasius equation‟, relating friction factor to the Reynolds number ? |
| A. | f = 0.079.NRe-0.25 |
| B. | f-0.5 = 4.07 loge (NRef)-0.6 |
| C. | Both ‘a’ and ‘b’ |
| D. | None of these |
| Answer» B. f-0.5 = 4.07 loge (NRef)-0.6 | |
| 23. |
Which of the following is not dimension-less ? |
| A. | Froude number |
| B. | Kinematic viscosity |
| C. | Pressure co-efficient |
| D. | None of these |
| Answer» C. Pressure co-efficient | |
| 24. |
Which of the following is not an advantage of fluidisation from transfer operation point of view ? |
| A. | Intimate contact of the fluid with all parts of the solid particles |
| B. | Lower fluid pumping power requirement |
| C. | Minimisation of temperature variation |
| D. | Prevention of particle segregation |
| Answer» C. Minimisation of temperature variation | |
| 25. |
Which of the following is a Newtonian fluid ? |
| A. | Rubber latex |
| B. | Sewage sludge |
| C. | Quicksand |
| D. | Non-colloidal solution |
| Answer» E. | |
| 26. |
Which of the following fluid forces are not considered in the Navier-Stoke’s equation ? |
| A. | Gravity forces |
| B. | Viscous forces |
| C. | Pressure forces |
| D. | Turbulent forces |
| Answer» E. | |
| 27. |
Which of the following facilitates close control of flow of fluids ? |
| A. | Gate valve |
| B. | Globe valve |
| C. | Butterfly valve |
| D. | Check valve |
| Answer» C. Butterfly valve | |
| 28. |
Which of the following equations is valid for laminar flow of a fluid through packed bed ? |
| A. | Fanning equation |
| B. | Kozeny – Karman equation |
| C. | Hagen-Poiseuille equation |
| D. | Blake-Plummer equation |
| Answer» C. Hagen-Poiseuille equation | |
| 29. |
Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0) with age/time (t) (where, ε = roughness of the surface after time’t’. α = a co-efficient to be experimentally determined) ? |
| A. | ε = ε0 + α.t |
| B. | ε = ε0 + α.t2 |
| C. | ε = ε0 + α.t3 |
| D. | ε = ε0 + α.t4 |
| Answer» B. ε = ε0 + α.t2 | |
| 30. |
Which of the following assumptions enables the Euler’s equation of motion to be integrated ? |
| A. | The fluid is incompressible |
| B. | The fluid is non-viscous |
| C. | The continuity equation is satisfied |
| D. | The flow is rotational and incompressible |
| Answer» B. The fluid is non-viscous | |
| 31. |
Which of the fluid forces are not considered in the Reynold’s equation of flow ? |
| A. | Viscous forces |
| B. | Turbulent forces |
| C. | Pressure forces |
| D. | Compressibility forces |
| Answer» E. | |
| 32. |
Which law/principle of solid mechanics is similar/equivalent to Newton’s law of viscosity in fluid mechanics ? |
| A. | Archimedes principle |
| B. | Newton’s second law of motion |
| C. | Hooke’s law |
| D. | Newton’s third law of motion |
| Answer» D. Newton’s third law of motion | |
| 33. |
Which law is followed by the velocity distribution in the turbulent boundary layer ? |
| A. | Parabolic law |
| B. | Linear law |
| C. | Logarithmic law |
| D. | None of these |
| Answer» D. None of these | |
| 34. |
Which is the correct relationship for a centrifugal pump? (Where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm) ? |
| A. | D = 1840 H0.5/N |
| B. | D = 1840 N/H0.5 |
| C. | H = 1840 D0.5/N |
| D. | D = 1840 H/N |
| Answer» B. D = 1840 N/H0.5 | |
| 35. |
Which is not a variable head meter _________________? |
| A. | Venturimeter |
| B. | Pitot tube |
| C. | Rotameter |
| D. | None of these |
| Answer» D. None of these | |
| 36. |
Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter ‘d’ ? |
| A. | At the centre |
| B. | At d/4 from the wall |
| C. | At the wall |
| D. | At d/8 from the wall |
| Answer» D. At d/8 from the wall | |
| 37. |
When the water is warm, the height to which it can be lifted by a pump_________________? |
| A. | Decreases due to reduced viscosity |
| B. | Decreases due to reduced vapour pressure |
| C. | Increases due to increased vapour pressure |
| D. | Decreases due to increased frictional resistance |
| Answer» C. Increases due to increased vapour pressure | |
| 38. |
When the pipe Reynold’s number is 6000, the flow is generally___________________? |
| A. | Viscous |
| B. | Laminar |
| C. | Turbulent |
| D. | Transition |
| Answer» D. Transition | |
| 39. |
When the momentum of one fluid is used for moving another fluid, such a device is called a/an______________? |
| A. | Jet pump |
| B. | Blower |
| C. | Acid egg |
| D. | None of these |
| Answer» B. Blower | |
| 40. |
When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an______________________? |
| A. | Ejector |
| B. | Blower |
| C. | Injector |
| D. | Airlift |
| Answer» E. | |
| 41. |
When larger particles e.g., grains are subjected to fluidisation, the corresponding bed produced is termed as the _______________ bed? |
| A. | Spouted |
| B. | Sluggish |
| C. | Boiling |
| D. | Teeter |
| Answer» B. Sluggish | |
| 42. |
When a fluid flows over a solid surface, the___________________? |
| A. | Velocity is uniform at any cross-section |
| B. | Velocity gradient is zero at the solid surface |
| C. | Resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves |
| D. | Velocity is not zero at the solid surface |
| Answer» C. Resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves | |
| 43. |
What type of motion the fluid element undergoes, when it changes from one position to another position, such that the angle between the two sides changes ? |
| A. | Rotation |
| B. | Translation |
| C. | Linear deformation |
| D. | Angular deformation |
| Answer» E. | |
| 44. |
What is the value of Fanning friction factor f ‘ for smooth pipe at NRe = 106 approximately ? |
| A. | 0.003 |
| B. | 0.01 |
| C. | 0.1 |
| D. | 0.3 |
| Answer» B. 0.01 | |
| 45. |
What is the shear rate at the pipe wall, in case of laminar flow of Newtonian 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 | |
| 46. |
What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe) ? |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» E. | |
| 47. |
What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water interface? The balloon is of radius 0.1 m and is filled with air ? |
| A. | 4πg/3 |
| B. | 0.01 πgH/4 |
| C. | 0.01 πgH/8 |
| D. | 0.04 πgH/3 |
| Answer» B. 0.01 πgH/4 | |
| 48. |
Weber number is the ratio of inertial force to _____________ force? |
| A. | Surface tension |
| B. | Gravity |
| C. | Viscous |
| D. | Elastic |
| Answer» B. Gravity | |
| 49. |
Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the___________________? |
| A. | Pipe length |
| B. | Fluid velocity in the pipe |
| C. | Time taken to close the valve |
| D. | All A., B. and C. |
| Answer» E. | |
| 50. |
Water hammer in a pipeline results from the____________________? |
| A. | Bursting of pipelines due to closure by a valve |
| B. | Rapid pressure change due to a rapid change in the rate of flow |
| C. | Pressure increase due to closure of a valve resulting in decrease in rate of flow |
| D. | None of these |
| Answer» C. Pressure increase due to closure of a valve resulting in decrease in rate of flow | |