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 ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is$? |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» E. | |
| 2. |
Stoke's equation is valid in the Reynolds number range$? |
| A. | 0.01 to 0.1 |
| B. | 0.1 to 2 |
| C. | 2 to 10 |
| D. | 10 to 100 |
| Answer» B. 0.1 to 2 | |
| 3. |
Prandtl mixing length is$? |
| A. | Applicable to laminar flow problems |
| B. | A universal constant |
| C. | Zero at the pipe wall |
| D. | None of these |
| Answer» D. None of these | |
| 4. |
__________ flow means the flow of incompressible fluid with no shear.$? |
| A. | Potential |
| B. | Streamline |
| C. | Creep |
| D. | Boundary layer |
| Answer» B. Streamline | |
| 5. |
Working of a __________ pump characterises mixed flow.$? |
| A. | Turbine |
| B. | Piston |
| C. | Diaphragm |
| D. | None of these |
| Answer» B. Piston | |
| 6. |
Viscosity of water at 40°C lies in the range of$? |
| A. | 1 x 10⁻³ to 2 x 10⁻³ kg/m.s |
| B. | 0.5 x 10⁻³ to 1 x 10⁻³ kg/m.s |
| C. | 1 to 2 kg/m.s |
| D. | 0.5 to 1 kg/m.s |
| Answer» C. 1 to 2 kg/m.s | |
| 7. |
Which of the following equations applies to the fluid flow through a packed bed for very large Reynolds number?$? |
| A. | Fanning equation |
| B. | Blake-Pllummer equation |
| C. | Hagen-Poiseulle equation |
| D. | Kozney-Karman equation |
| Answer» C. Hagen-Poiseulle equation | |
| 8. |
Hydraulic __________ works on the principle of Pascal's law of transmission of fluid pressure.$? |
| A. | Press |
| B. | Turbine |
| C. | Pump |
| D. | Coupling |
| Answer» B. Turbine | |
| 9. |
The pressure intensity is the same in all directions at a point in a fluid$? |
| A. | Only when the fluid is frictionless |
| B. | Only when the fluid is at rest having zero velocity |
| C. | When there is no motion of one fluid layer relative to an adjacent layer |
| D. | Regardless of the motion of one fluid layer relative to an adjacent layer |
| Answer» D. Regardless of the motion of one fluid layer relative to an adjacent layer | |
| 10. |
What is the maximum theoretical suction lift (metres) of a reciprocating pump?$? |
| A. | 5 |
| B. | 10 |
| C. | 50 |
| D. | 100 |
| Answer» C. 50 | |
| 11. |
As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re |
| A. | Increases linearly with V |
| B. | Decreases linearly with V |
| C. | Decreases as V² |
| D. | None of these |
| Answer» B. Decreases linearly with V | |
| 12. |
A differential pressure cell is used for$? |
| A. | Measuring small pressure difference in gases |
| B. | Measuring small pressure difference in liquids |
| C. | Remote recording of pressure difference |
| D. | Measuring the difference of the impact & the static pressure |
| Answer» D. Measuring the difference of the impact & the static pressure | |
| 13. |
Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition.$? |
| A. | ‚à Ç/‚à Çt = 0 |
| B. | ‚à Ç/‚à Çt = constant |
| C. | ‚à Ç/‚à Çs = 0 |
| D. | ‚à Ç/‚à Çt = constant |
| Answer» D. ‚Äö√ √á/‚Äö√ √át = constant | |
| 14. |
Toothpaste is a$? |
| A. | Bingham plastic |
| B. | Pseudoplastic |
| C. | Newtonion liquid |
| D. | Dilatent |
| Answer» E. | |
| 15. |
Capillary tube method of viscosity measurement is based on the$? |
| A. | Hagen-Poiseulle's equation |
| B. | Stoke's law |
| C. | Navier-stokes equation |
| D. | None of these |
| Answer» B. Stoke's law | |
| 16. |
In case of supersonic flow of a fluid through pipeline, the 'Mach number' is$? |
| A. | 0 |
| B. | 1 |
| C. | < 1 |
| D. | > 1 |
| Answer» E. | |
| 17. |
What is the unit of kinematic viscosity in SI unit?$? |
| A. | m²/sec |
| B. | N/m² . sec |
| C. | Kg . sec/m |
| D. | None of these |
| Answer» B. N/m¬¨‚⧠. sec | |
| 18. |
The Navier-Stokes equation deals with the law of conservation of$? |
| A. | Mass |
| B. | Energy |
| C. | Both A and B |
| D. | Momentum |
| Answer» E. | |
| 19. |
Surge tanks are provided in high pressure water pipelines to$? |
| A. | Store a definte quantity ofwater all the time |
| B. | Reduce the water hammer |
| C. | Facilitate easy dismantling of pipeline for cleaning and maintenance |
| D. | None of these |
| Answer» C. Facilitate easy dismantling of pipeline for cleaning and maintenance | |
| 20. |
The maximum delivery pressure of compressors can be upto __________ atmospheres.$? |
| A. | 10 |
| B. | 100 |
| C. | 250 |
| D. | 1000 |
| Answer» E. | |
| 21. |
It is possible to integrate an automatic flow controller to a$? |
| A. | Flow nozzle |
| B. | Venturimeter |
| C. | Rotameter |
| D. | None of these |
| Answer» D. None of these | |
| 22. |
At a constant speed of the centrifugal pump . it __________ the impeller diameter.$? |
| A. | Capacity varies directly with |
| B. | Head varies as the square of |
| C. | Horsepower varies as the cube of |
| D. | All of the above |
| Answer» E. | |
| 23. |
Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics.$? |
| A. | Piston |
| B. | Gear |
| C. | Positive displacement |
| D. | Sump |
| Answer» C. Positive displacement | |
| 24. |
The dimension of kinematic viscosity is$? |
| A. | ML⁻²T⁻¹ |
| B. | L²T⁻¹ |
| C. | ML⁻²T⁻² |
| D. | None of these |
| Answer» C. ML‚Äö√Ö¬™¬¨‚â§T‚Äö√Ö¬™¬¨‚⧠| |
| 25. |
For the transfer of solution of thick slurry, the pump used is a __________ pump.$? |
| A. | Reciprocating |
| B. | Gear |
| C. | Diaphragm |
| D. | Centrifugal |
| Answer» D. Centrifugal | |
| 26. |
With a constant diameter impeller of a centrifugal pump$? |
| A. | Its capacity varies directly as the square of speed |
| B. | Head varies as the square of speed |
| C. | Horsepower input varies as the square of speed |
| D. | Head varies as the speed |
| Answer» C. Horsepower input varies as the square of speed | |
| 27. |
A special type of liquid transporting device is the diffuser pump, in which __________ are minimised.$? |
| A. | Bearing losses |
| B. | Disk friction |
| C. | Shock losses |
| D. | Cavitation |
| Answer» D. Cavitation | |
| 28. |
For a particle settling in water at its terminal settling velocity, which of the following is true?$? |
| A. | Buoyancy = weight + drag |
| B. | Weight = buoyancy + drag |
| C. | Drag = buoyancy + weight |
| D. | Drag = weight |
| Answer» C. Drag = buoyancy + weight | |
| 29. |
In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure __________ the vapor pressure of the liquid at the suction temperature.$? |
| A. | Lower than |
| B. | Higher than |
| C. | Equal to |
| D. | None of these |
| Answer» C. Equal to | |
| 30. |
For the manometer set up shown in the figure, the pressure difference PA - PB is given by$? |
| A. | (ρH - ρair)gH |
| B. | (ρH - ρL)gH |
| C. | (ρH - ρL) gH + (ρL - ρair) . g(L - H) |
| D. | (ρH - ρL) gL + (ρL - ρair)gH |
| Answer» B. (≈ì√ÖH - ≈ì√ÖL)gH | |
| 31. |
The discharge through a rectangular weir varies as$? |
| A. | H1/2 |
| B. | H5/2 |
| C. | H2/5 |
| D. | H3/2 |
| Answer» E. | |
| 32. |
In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.$? |
| A. | Inverse |
| B. | Square root |
| C. | Second power |
| D. | First power |
| Answer» C. Second power | |
| 33. |
A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m³/s? The Fanning friction factor, f is 0.0062.$? |
| A. | 10 m |
| B. | 11 m |
| C. | 12 m |
| D. | 20 m |
| Answer» C. 12 m | |
| 34. |
Purpose of relief valve in a reciprocating pump is to$? |
| A. | Protect the pump against developing excessive pressure |
| B. | Facilitate unidirectional flow of liquid |
| C. | Reduce the discharge pressure |
| D. | Control the rate of discharge |
| Answer» B. Facilitate unidirectional flow of liquid | |
| 35. |
Bed pressure drop in an air fluidised bed of catalyst particles (ρp = 200 kg/m³, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is$? |
| A. | 90 |
| B. | 60 |
| C. | 45 |
| D. | 30 |
| Answer» C. 45 | |
| 36. |
The distance between metacentre and __________ is called metacentric height.$? |
| A. | Water surface |
| B. | Centre of gravity |
| C. | Centre of buoyancy |
| D. | None of these |
| Answer» C. Centre of buoyancy | |
| 37. |
Select the wrong statement pertaining to flow of an incompressible fluid through a venturimeter.$? |
| A. | For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that leaving the venturimeter |
| B. | Discharge of fluid through a venturimeter depends upon the gage difference irrespective of the orientation of venturimeter |
| C. | Venturimeter occupies less space than an orificemeter |
| D. | Venturimeter incurs less power loss compared to an equivalent orificemeter |
| Answer» D. Venturimeter incurs less power loss compared to an equivalent orificemeter | |
| 38. |
While starting an axial flow pump, its delivery valve should be kept$? |
| A. | Open |
| B. | Closed |
| C. | Either open or closed |
| D. | None of these |
| Answer» B. Closed | |
| 39. |
Which of the following is an undesirable property of a manometric liquid?$? |
| A. | Non-sticky & non-corrosive nature |
| B. | High vapour pressure |
| C. | Low viscosity & surface tension |
| D. | Low co-efficient of thermal expansion |
| Answer» C. Low viscosity & surface tension | |
| 40. |
A fluid element has a velocity V = -y¬≤ . xi + 2yx¬≤ . j. The motion at (x, y) = (l/‚à ö2, 1) is$? |
| A. | Rotational and incompressible |
| B. | Rotational and compressible |
| C. | Irrotational and compressible |
| D. | Irrotational and incompressible |
| Answer» C. Irrotational and compressible | |
| 41. |
What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.5)?$? |
| A. | 0.61 - 0.63 |
| B. | 0.5 - 0.75 |
| C. | 0.75 - 0.90 |
| D. | 0.35 - 0.55 |
| Answer» B. 0.5 - 0.75 | |
| 42. |
The head developed by a centrifugal pump is largely determined by the$? |
| A. | Power of the pump |
| B. | Nature of the liquid being pumped |
| C. | Angle of the vanes and the speed of the tip of the impeller |
| D. | Vapour pressure of the liquid |
| Answer» D. Vapour pressure of the liquid | |
| 43. |
The velocity distribution in direction normal to the direction of flow in plane Poiseuille flow is$? |
| A. | Hyperbolic |
| B. | Parabolic |
| C. | Linear |
| D. | None of these |
| Answer» C. Linear | |
| 44. |
For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary$? |
| A. | Directly as square of gas density |
| B. | Directly as gas density |
| C. | Directly as square root of gas density |
| D. | Inversely as gas density |
| Answer» C. Directly as square root of gas density | |
| 45. |
Co-efficient of velocity is __________ the coefficient of discharge.$? |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | Not related to |
| Answer» C. Equal to | |
| 46. |
Which of the following valves will incur maximum pressure drop for the same discharge of water?$? |
| A. | Globe valve |
| B. | Gate valve |
| C. | Needle valve |
| D. | Butterfly valve |
| Answer» D. Butterfly valve | |
| 47. |
A bed consists of particles of density 2000 kg/m³. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is$? |
| A. | 25.61 kPa |
| B. | 11.77 kPa |
| C. | 14.86 kPa |
| D. | 21.13 kPa |
| Answer» C. 14.86 kPa | |
| 48. |
Friction factor for a hydraulically smooth pipe at NRe = 2100 is f‚ÇÅ. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will$? |
| A. | Increase |
| B. | Decrease |
| C. | Remain unchanged |
| D. | Increase or decrease depending on the pipe material |
| Answer» B. Decrease | |
| 49. |
A pressure head of 320 metres of water in meters of CCl‚ÇÑ (sp.gr = 1.6) will be$? |
| A. | 100 |
| B. | 200 |
| C. | 320 |
| D. | 160 |
| Answer» C. 320 | |
| 50. |
For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively).$? |
| A. | Increase |
| B. | Decrease |
| C. | Remain constant |
| D. | Either A or B; depends on other factors |
| Answer» B. Decrease | |