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. |
If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor). ? |
| A. | Q = Q1 + Q2 + Q3 |
| B. | V1 = V2 = V3 |
| C. | Q1 = Q2 = Q3 |
| D. | f = f1 + f2 + f3 |
| Answer» B. V1 = V2 = V3 | |
| 2. |
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 | |
| 3. |
If the discharge of a centrifugal pump is throttled, then its suction lift_______________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Data insufficient to predict |
| Answer» B. Decreases | |
| 4. |
If more than two branches of pipes are to be connected at the same point, then use a/an_________________? |
| A. | Elbow |
| B. | Union |
| C. | Tee |
| D. | None of these |
| Answer» D. None of these | |
| 5. |
If in a flow field, between any two points, then the flow must be___________________? |
| A. | Steady, incompressible, irrotational |
| B. | Steady, compressible, irrotational |
| C. | Steady, compressible and along a streamline |
| D. | Unsteady, incompressible, irrotational |
| Answer» B. Steady, compressible, irrotational | |
| 6. |
If Blasius or Darcy friction factor is ‘f1’ then the Fanning friction factor is equal to____________________? |
| A. | f1/4 |
| B. | 4f2 |
| C. | 2f1 |
| D. | f1/2 |
| Answer» B. 4f2 | |
| 7. |
Identification of pipelines carrying different liquids and gases is done by the ____________ of the pipe? |
| A. | Diameter |
| B. | Colour |
| C. | Altitude |
| D. | None of these |
| Answer» C. Altitude | |
| 8. |
I.D. of 1/4″ schedule 40 pipe is 0.364″. I.D. of a 1/2″ schedule 40 pipe would be ______________ inch? |
| A. | 4.728 |
| B. | 0.5 |
| C. | 0.622 |
| D. | 0.474 |
| Answer» D. 0.474 | |
| 9. |
Hydrometer measures the specific gravity of liquids based on the principles of buoyancy. Pycnometer is used to measure the specific gravity of_________________? |
| A. | Powder & granular solids |
| B. | Powder & granular solids |
| C. | Powder & granular solids |
| D. | All A, B & C |
| Answer» E. | |
| 10. |
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 | |
| 11. |
Hydraulic radius is the ratio of ____________________? |
| A. | Wetted perimeter to flow area |
| B. | Flow area to wetted perimeter |
| C. | Flow area to square of wetted perimeter |
| D. | Square root of flow area to wetted perimeter |
| Answer» C. Flow area to square of wetted perimeter | |
| 12. |
Hydraulic mean radius for flow through packed bed of spherical particle of size, ‘Dp, with porosity ‘ε’ is________________? |
| A. | (Dp/6) (ε/1- ε) |
| B. | (Dp/6) (1- ε/ε) |
| C. | ⅔Dp (1- ε/ε) |
| D. | ⅔Dp (ε/1- ε) |
| Answer» B. (Dp/6) (1- ε/ε) | |
| 13. |
Hydraulic mean depth (Dm) for a circular pipe of diameter ‘D’ flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum ? |
| A. | Flow rate |
| B. | Mean velocity |
| C. | Both ‘a’ & ‘b’ |
| D. | Neither ‘a’ nor ‘ |
| Answer» C. Both ‘a’ & ‘b’ | |
| 14. |
Hydraulic intensifier is used for increasing the ___________________? |
| A. | Rate of velocity of liquid supply |
| B. | Rate of flow through delivery pipeline of a pump |
| C. | Intensity of pressure of the liquid |
| D. | Momentum rate through delivery pipe |
| Answer» D. Momentum rate through delivery pipe | |
| 15. |
Hydraulic diameter for non-circular ducts is equal to ___________ times the area of flow divided by the perimeter? |
| A. | Two |
| B. | Three |
| C. | Four |
| D. | Eight |
| Answer» D. Eight | |
| 16. |
Hot wire anemometer is used to measure the_________________? |
| A. | Velocity of liquids |
| B. | Temperature of liquids |
| C. | Velocity of gases |
| D. | Pressure of liquids |
| Answer» D. Pressure of liquids | |
| 17. |
Horsepower requirement for given pump capacity depends upon the_______________? |
| A. | Specific gravity of the liquid |
| B. | Suction lift |
| C. | Discharge head |
| D. | All A., B. and C. |
| Answer» E. | |
| 18. |
Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will _____________ the gas discharge pressure? |
| A. | Increase |
| B. | Decrease |
| C. | Not change |
| D. | Exponentially decrease |
| Answer» B. Decrease | |
| 19. |
Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of ______________ flow type? |
| A. | Axial |
| B. | Radial |
| C. | Mixed |
| D. | None of these |
| Answer» B. Radial | |
| 20. |
High specific speed of a pump implies that, it is a/an _____________ pump? |
| A. | Centrifugal |
| B. | Mixed flow |
| C. | Axial flow |
| D. | None of these |
| Answer» D. None of these | |
| 21. |
Head developed by a centrifugal pump depends on its___________________? |
| A. | Speed |
| B. | Impeller diameter |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 22. |
Gradually varying fluid flow is an example of ____________ flow? |
| A. | Non-steady uniform |
| B. | Non-steady non-uniform |
| C. | Steady uniform |
| D. | Steady non-uniform |
| Answer» B. Non-steady non-uniform | |
| 23. |
Gradually varied flow in open channel is a/an ____________ flow? |
| A. | Steady uniform |
| B. | Steady non-uniform |
| C. | Unsteady uniform |
| D. | Unsteady non-uniform |
| Answer» C. Unsteady uniform | |
| 24. |
Glass pipes can be joined by__________________? |
| A. | Flanges |
| B. | Welding |
| C. | Soldering |
| D. | Bell and spigot joint |
| Answer» E. | |
| 25. |
Gear pump_________________? |
| A. | Is a positive displacement pump |
| B. | Is a centrifugal pump |
| C. | Is a non-positive displacement pump |
| D. | Can be started with delivery valve closed |
| Answer» B. Is a centrifugal pump | |
| 26. |
Function of air vessel provided in a reciprocating pump is to_________________? |
| A. | Reduce discharge fluctuation |
| B. | Reduce the danger of cavitation |
| C. | Avoid the necessity of priming |
| D. | Increase the pump efficiency |
| Answer» B. Reduce the danger of cavitation | |
| 27. |
Froude number is the ratio of__________________? |
| A. | Shear stress to gravitational stress |
| B. | Drag stress to shear stress |
| C. | Inertial stress to shear stress |
| D. | Inertial stress to gravitational stress |
| Answer» E. | |
| 28. |
Froude number is not a factor__________________? |
| A. | For Reynolds number greater than 300 |
| B. | When there is no vortex formation |
| C. | For unbaffled tank |
| D. | None of these |
| Answer» C. For unbaffled tank | |
| 29. |
Friction produced by the formation of wakes is called the ______________ friction? |
| A. | Disk |
| B. | Skin |
| C. | Form |
| D. | None of these |
| Answer» D. None of these | |
| 30. |
Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1. 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 | |
| 31. |
_____________ forces do not act in case of fluid flow ? |
| A. | Elastic |
| B. | Tensile |
| C. | Vibratory |
| D. | Centrifugal |
| Answer» C. Vibratory | |
| 32. |
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 | |
| 33. |
_____________ forces act on a particle moving through a stationary fluid? |
| A. | Gravity |
| B. | Drag |
| C. | Buoyant |
| D. | All A., B., & C. |
| Answer» E. | |
| 34. |
For water, when the pressure increases, the viscosity_________________? |
| A. | Also increases |
| B. | Decreases |
| C. | Remain constant |
| D. | First decreases, and then increases |
| Answer» E. | |
| 35. |
For very low pressure and high discharge rate, the compressor used is a/an ______________ compressor? |
| A. | Axial |
| B. | Reciprocating |
| C. | Rotary |
| D. | None of these |
| Answer» D. None of these | |
| 36. |
For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance ‘d’ measured from the wall of the pipe and the friction velocity ‘v’, and it follows a _____________ relationship? |
| A. | Logarithmic |
| B. | Linear |
| C. | Hyperbolic |
| D. | Parabolic |
| Answer» B. Linear | |
| 37. |
For turbulent flow of Newtonian fluid in a circular cross-section pipe, the ratio of maximum to average fluid velocity is ________________? |
| A. | 0.5 |
| B. | 1 |
| C. | 0.66 |
| D. | < 0.5 |
| Answer» C. 0.66 | |
| 38. |
For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance) ? |
| A. | V/Vmax = (x/r)1/7 |
| B. | V/Vmax = (r/x)1/7 |
| C. | V/Vmax = (x.r)1/7 |
| D. | None of these |
| Answer» B. V/Vmax = (r/x)1/7 | |
| 39. |
For turbulent flow of an incompressible fluid through a pipe, the flow rate „Q‟ is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent ‘n’ is_________________? |
| A. | 1 |
| B. | 0 |
| C. | < 1 |
| D. | > 1 |
| Answer» D. > 1 | |
| 40. |
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 | |
| 41. |
For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is___________________? |
| A. | More |
| B. | Less |
| C. | Equal |
| D. | Either A. or B.; depends on the viscosity of the fluid |
| Answer» B. Less | |
| 42. |
For the same terminal conditions and fitting size, the least friction loss is incurred in a/an ? |
| A. | T-joint |
| B. | Union |
| C. | 45° elbow |
| D. | 90°bend |
| Answer» C. 45° elbow | |
| 43. |
For the same flow rate of a fluid, the pressure drop is the least for ____________________? |
| A. | Venturimeter |
| B. | Orificemeter |
| C. | Flow-nozzle |
| D. | Δp is same for all |
| Answer» B. Orificemeter | |
| 44. |
For the production of very high vacuum, a _____________ pump is normally used? |
| A. | Diffusion |
| B. | Centrifugal |
| C. | Jet ejector |
| D. | Piston |
| Answer» B. Centrifugal | |
| 45. |
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. (ρH – ρL)gH | |
| 46. |
For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to____________________? |
| A. | R |
| B. | R² |
| C. | R⁴ |
| D. | R⁰.⁵ |
| Answer» D. R⁰.⁵ | |
| 47. |
For the free settling of a spherical particle through a fluid, the slope of, CD-log NRe, plot is____________________? |
| A. | 1 |
| B. | -1 |
| C. | 0.5 |
| D. | -0.5 |
| Answer» C. 0.5 | |
| 48. |
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 | |
| 49. |
For pipes that must be broken at intervals for maintenance, the connector used should be a/an__________________? |
| A. | Union |
| B. | Tee |
| C. | Reducer |
| D. | Elbow |
| Answer» B. Tee | |
| 50. |
For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter) ? |
| A. | 1/D |
| B. | 1/D2 |
| C. | 1/D5 |
| D. | D2 |
| Answer» D. D2 | |