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 most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a____________________? |
| A. | Weir |
| B. | Pitot tube |
| C. | Kennison nozzle |
| D. | V-notch |
| Answer» C. Kennison nozzle | |
| 2. |
The most serious disadvantage of an orificemeter is that________________? |
| A. | It is not very accurate |
| B. | It is very costly |
| C. | Most of the pressure drop is not recoverable |
| D. | It is not suitable for measuring gas flow |
| Answer» D. It is not suitable for measuring gas flow | |
| 3. |
The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the_____________________? |
| A. | Barometric pressure |
| B. | Speed of the impeller |
| C. | Diameter of the impeller |
| D. | Both B. and C. |
| Answer» B. Speed of the impeller | |
| 4. |
The most economical flow control valve for use with large diameter pipes is a__________________? |
| A. | Butterfly valve |
| B. | Globe valve |
| C. | Needle valve |
| D. | None of these |
| Answer» B. Globe valve | |
| 5. |
The momentum correction factor for the velocity distribution of laminar flow is____________________? |
| A. | 1.3 |
| B. | 1.66 |
| C. | 2.5 |
| D. | None of these |
| Answer» E. | |
| 6. |
The maximum head that can be developed by a single impeller is _____________ ft? |
| A. | 25 |
| B. | 100 |
| C. | 250-300 |
| D. | 1000 |
| Answer» D. 1000 | |
| 7. |
The maximum discharge through a circular channel takes place, when the depth of the fluid flow is ______________ times the pipe diameter? |
| A. | 0.25 |
| B. | 0.5 |
| C. | 0.66 |
| D. | 0.95 |
| Answer» E. | |
| 8. |
The maximum depth from which a centrifugal pump can draw water is________________? |
| A. | Dependent on the speed of the pump |
| B. | Dependent on the power of the pump |
| C. | 34 feet |
| D. | 150 feet |
| Answer» D. 150 feet | |
| 9. |
The maximum delivery pressure of compressors can be upto _____________ atmospheres? |
| A. | 10 |
| B. | 100 |
| C. | 250 |
| D. | 1000 |
| Answer» E. | |
| 10. |
The maximum delivery pressure of a reciprocating compressor may be about ______________ kg/cm2? |
| A. | 1000 |
| B. | 2000 |
| C. | 3000 |
| D. | 4000 |
| Answer» E. | |
| 11. |
The main factor on which the behaviour of a mass of fluidised solid depends mainly is the___________________? |
| A. | Fluid characteristics |
| B. | Particle size |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 12. |
The Mach number for hypersonic flow of compressible fluid is____________________? |
| A. | 1 |
| B. | > 1 |
| C. | > 4 |
| D. | < 2 |
| Answer» D. < 2 | |
| 13. |
The losses in open channel flow generally vary as the ________________? |
| A. | Inverse of the roughness |
| B. | First power of the roughness |
| C. | Square of the velocity |
| D. | Inverse square of hydraulic radius |
| Answer» C. Square of the velocity | |
| 14. |
The location of centre of pressure, which defines the point of application of the total pressure force on the surface, can be calculated by applying the principle of moments according to which “sum of the moment of the resultant force about an axis is equal to the sum of the components about the same axis”. The centre of pressure of a rectangular surface (of width ‘w’) immersed vertically in a static mass of fluid is at a depth of (where, y = depth of the liquid) ? |
| A. | 1/(y/3) |
| B. | 2y/3 |
| C. | 1/(y/4) |
| D. | 3y/4 |
| Answer» C. 1/(y/4) | |
| 15. |
The line traced by a single fluid particle as it moves over a period of time is called ______________ line? |
| A. | Stream |
| B. | Path |
| C. | Equipotential |
| D. | None of these |
| Answer» C. Equipotential | |
| 16. |
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 | |
| 17. |
The line of action of the buoyant force acts through the____________________? |
| A. | Centroid of the displaced volume of fluid |
| B. | Centre of gravity of a submerged body |
| C. | Centroid of the volume of any floating body |
| D. | None of these |
| Answer» B. Centre of gravity of a submerged body | |
| 18. |
The lift of a balloon 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 | |
| 19. |
The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the _____________ length? |
| A. | Equivalent |
| B. | Transition |
| C. | Prandtl mixing |
| D. | None of these |
| Answer» C. Prandtl mixing | |
| 20. |
The kinetic energy correction factor for velocity distribution of laminar flow is_________________? |
| A. | 0.5 |
| B. | 1.66 |
| C. | 1 |
| D. | 2 |
| Answer» C. 1 | |
| 21. |
The ____________ is measured by a piezometric opening? |
| A. | Dynamic pressure |
| B. | Static pressure |
| C. | Total pressure |
| D. | Point velocity |
| Answer» D. Point velocity | |
| 22. |
The inherent characteristic of an equal percentage valve relating flow rate ‘q’ with valve stem movement ‘x’ are described by the equation_________________? |
| A. | dq/dx = K |
| B. | dq/dx = K.q |
| C. | dq/dx = K/q |
| D. | dq/dx = Kq2 |
| Answer» B. dq/dx = K.q | |
| 23. |
The hydrodynamic and thermal boundary layers will merge, when ____________________? |
| A. | Prandtl number is one |
| B. | Schmidt number tends to infinity |
| C. | Nusselt number tends to infinity |
| D. | Archimedes number is greater than 10000 |
| Answer» B. Schmidt number tends to infinity | |
| 24. |
The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is___________________? |
| A. | √(HW/π) |
| B. | HW/2 (H + W)2 |
| C. | HW/4 (H + W)2 |
| D. | 2HW/(H + W) |
| Answer» C. HW/4 (H + W)2 | |
| 25. |
The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is___________________? |
| A. | 4(Ro-Ri) |
| B. | √(Ro-Ri) |
| C. | 2(Ro-Ri) |
| D. | Ro + Ri |
| Answer» D. Ro + Ri | |
| 26. |
The head loss in turbulent flow in pipe is proportional to(where, V = velocity of fluid through the pipe) ? |
| A. | V2 |
| B. | 1/V2 |
| C. | 1/V |
| D. | V |
| Answer» B. 1/V2 | |
| 27. |
The head loss due to sudden expansion is__________________? |
| A. | (V12 – V22)/2gc |
| B. | (V1 – V2)2/2gc |
| C. | (V1 – V2)/2gc |
| D. | (V12 – V22)/gc |
| Answer» C. (V1 – V2)/2gc | |
| 28. |
The head loss in turbulent flow in a pipe varies_________________? |
| A. | Directly as the velocity |
| B. | Inversely as the square of the velocity |
| C. | Approximately as the square of the velocity |
| D. | Inversely as the square of the diameter |
| Answer» D. Inversely as the square of the diameter | |
| 29. |
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 | |
| 30. |
The head loss in turbulent flow in a pipe varies________________? |
| A. | As velocity |
| B. | As (velocity)2 |
| C. | Inversely as the square of diameter |
| D. | Inversely as the velocity |
| Answer» C. Inversely as the square of diameter | |
| 31. |
The head loss due to sudden contraction is proportional to___________________? |
| A. | Velocity |
| B. | Velocity head |
| C. | Turbulence |
| D. | None of these |
| Answer» C. Turbulence | |
| 32. |
The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is_________________? |
| A. | Q∝N : H∝N2 : P∝N3 |
| B. | Q∝N2 : H∝N3 : P∝N |
| C. | Q∝N : H∝N3 : P∝N2 |
| D. | Q∝N3 : H∝N : P∝N2 |
| Answer» B. Q∝N2 : H∝N3 : P∝N | |
| 33. |
The frictional resistance in laminar flow does not depend on the_________________? |
| A. | Area of surface in contact |
| B. | Flow velocity |
| C. | Fluid temperature |
| D. | Pressure of flow |
| Answer» B. Flow velocity | |
| 34. |
The friction factor is___________________? |
| A. | Always inversely proportional to the Reynolds number |
| B. | Not dimensionless |
| C. | Not dependent on the roughness of the pipe |
| D. | None of these |
| Answer» E. | |
| 35. |
The friction factor for turbulent flow in a hydraulically smooth pipe______________? |
| A. | Depends only on Reynolds number |
| B. | Does not depend on Reynolds number |
| C. | Depends on the roughness |
| D. | None of these |
| Answer» B. Does not depend on Reynolds number | |
| 36. |
The fluid velocity varies as the square root of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop of _____________ fluid? |
| A. | Dilatent |
| B. | Pseudo-plastic |
| C. | Bingham plastic |
| D. | Newtonian |
| Answer» B. Pseudo-plastic | |
| 37. |
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. | Newtonian |
| B. | Dilatant |
| C. | Pseudo-plastic |
| D. | Non-Newtonian |
| Answer» B. Dilatant | |
| 38. |
The fluid property which matters for falling rain drops to acquire spherical shape is its__________________? |
| A. | Pressure |
| B. | Height of descend |
| C. | Viscosity |
| D. | Surface tension |
| Answer» E. | |
| 39. |
The fluid velocity varies as the cube of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop for ____________ fluid? |
| A. | Newtonian |
| B. | Pseudo-plastic |
| C. | Dilatent |
| D. | Bingham plastic |
| Answer» C. Dilatent | |
| 40. |
The fluid jet discharging from a 2″ diameter orifice has a diameter of 1.75″ at its venacontracta. The co-efficient of contraction is___________________? |
| A. | 1.3 |
| B. | 0.766 |
| C. | 0.87 |
| D. | None of these |
| Answer» C. 0.87 | |
| 41. |
The fluid property, due to which, mercury does not wet the glass is__________________? |
| A. | Surface tension |
| B. | Viscosity |
| C. | Cohesion |
| D. | Adhesion |
| Answer» B. Viscosity | |
| 42. |
The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a _____________ fluid? |
| A. | Bingham |
| B. | Newtonian |
| C. | Perfect |
| D. | None of these |
| Answer» C. Perfect | |
| 43. |
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 | |
| 44. |
The flow of a liquid through tapering pipe at a constant rate is an example of _______________ flow? |
| A. | Steady uniform |
| B. | Steady non uniform |
| C. | Unsteady uniform |
| D. | Unsteady non uniform |
| Answer» C. Unsteady uniform | |
| 45. |
The exit cone angle in case of a standard Venturimeter is _____________ the entrance cone angle? |
| A. | Smaller than |
| B. | Greater than |
| C. | Equal to |
| D. | Either A. or B. |
| Answer» B. Greater than | |
| 46. |
The excess of the sum of pressure & velocity heads over the vapor pressure of the liquid at the suction is called the___________________? |
| A. | Static submergence |
| B. | Net positive suction head (NPSH) |
| C. | Cavitation sensitivity |
| D. | Priming |
| Answer» C. Cavitation sensitivity | |
| 47. |
The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides ‘x’ & ‘y’ is given by_________________? |
| A. | 2xy/(x + y) |
| B. | xy/(x + y) |
| C. | (x + y)/2xy |
| D. | (x + y)/xy |
| Answer» B. xy/(x + y) | |
| 48. |
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) ? |
| A. | x |
| B. | √(πx) |
| C. | √(2x) |
| D. | √(x/2) |
| Answer» B. √(πx) | |
| 49. |
The equivalent diameter for fluid flow through square cross section channel of side ‘x’, for pressure drop calculation purpose is given by____________________? |
| A. | 4x |
| B. | 2x |
| C. | x |
| D. | √x |
| Answer» D. √x | |
| 50. |
The equivalent diameter for flow through a rectangular duct of width B and height H is___________________? |
| A. | HB/2 (H + B) |
| B. | HB/(H + B) |
| C. | 2HB/(H + B) |
| D. | 4HB/(H + B) |
| Answer» D. 4HB/(H + B) | |