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. |
For one dimensional flow of an incompressible fluid in unsteady state in x-direction, the continuity equation is given by_______________? |
| A. | ∂u/∂x = 0 |
| B. | ∂(ρu)/∂x = 0 |
| C. | (∂u/∂x) = – (∂ρ/∂t) |
| D. | ∂ρ/∂t = 0 |
| Answer» B. ∂(ρu)/∂x = 0 | |
| 2. |
For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is _______________? |
| A. | More |
| B. | Less |
| C. | Equal |
| D. | More or less, depending on the type of particle |
| Answer» B. Less | |
| 3. |
For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is________________? |
| A. | More |
| B. | Less |
| C. | Equal |
| D. | Independent of porosity |
| Answer» C. Equal | |
| 4. |
For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter) ? |
| A. | Vs/Dp2 |
| B. | Vs2/Dp2 |
| C. | Vs2/Dp3 |
| D. | Vs/Dp3 |
| Answer» B. Vs2/Dp2 | |
| 5. |
For laminar flow through a closed conduit____________________? |
| A. | Vmax = 2Vav |
| B. | Vmax = Vav |
| C. | Vmax = 1.5Vav |
| D. | Vmax = 0.5Vav |
| Answer» B. Vmax = Vav | |
| 6. |
For laminar flow of Newtonian fluid in a circular pipe, the velocity distribution is a function of the distance ‘d’ measured from the centre line of the pipe, and it follows a ______________ relationship? |
| A. | Logarithmic |
| B. | Parabolic |
| C. | Hyperbolic |
| D. | Linear |
| Answer» C. Hyperbolic | |
| 7. |
For laminar flow of Newtonian fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to (where, μ = fluid viscosity ) ? |
| A. | μ |
| B. | 1/μ |
| C. | √μ |
| D. | 1/√μ |
| Answer» C. √μ | |
| 8. |
For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of_________________? |
| A. | 2 |
| B. | <2 |
| C. | >2 |
| D. | 1/2 |
| Answer» B. <2 | |
| 9. |
For laminar flow of a fluid through a packed bed of spheres of diameter d, the pressure drop per unit length of bed depends upon the sphere diameter as_________________? |
| A. | d |
| B. | d2 |
| C. | d4 |
| D. | d̅ 2 |
| Answer» E. | |
| 10. |
For ideally incompressible fluid, the Mach number will be __________________? |
| A. | 1.5 |
| B. | 1 |
| C. | 0 |
| D. | 5 |
| Answer» C. 0 | |
| 11. |
For flow through a venturi at a particular discharge, the correct relationships among velocities at point X, Y and Z would be __________________? |
| A. | V1 < V2 < V3 |
| B. | V2 > V1 and V2 > V3 |
| C. | V1 > V2 > V3 |
| D. | None of these |
| Answer» C. V1 > V2 > V3 | |
| 12. |
For flow through an orifice from a reservoir, the actual velocity at the vena contracta is given by _________________? |
| A. | √(2gh) |
| B. | C.V. √(2gh) |
| C. | Cd √(2gh) |
| D. | Cc √(2gh) |
| Answer» C. Cd √(2gh) | |
| 13. |
For flow through a venturi at a particular discharge, the correct relationships among heads at points X, Y, and Z are__________________? |
| A. | h1 > h2 < h3 |
| B. | h1 > h2 > h3 |
| C. | h2 < h1 < h3 |
| D. | h1 < h2 < h3 |
| Answer» B. h1 > h2 > h3 | |
| 14. |
For flow past a flat plate, if „x‟ is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to________________? |
| A. | √x |
| B. | 1/√x |
| C. | x |
| D. | 1/x |
| Answer» B. 1/√x | |
| 15. |
For flow of fluids through packed bed, the superficial velocity is_________________? |
| A. | Less than the average velocity through channels |
| B. | More than the average velocity through channels |
| C. | Dependent on the pressure drop across the bed |
| D. | Same as the average velocity through channels |
| Answer» B. More than the average velocity through channels | |
| 16. |
For an unstable equilibrium of a floating body (where, M = metacentre.) ? |
| A. | M is above G |
| B. | M is below G |
| C. | M & G coincide |
| D. | None of these |
| Answer» C. M & G coincide | |
| 17. |
For an incompressible fluid, the bulk modulus of elasticity is____________________? |
| A. | 5 kg/m3 |
| B. | ∞ N/m2 |
| C. | 1 N |
| D. | 0 N/m |
| Answer» C. 1 N | |
| 18. |
For an ideal fluid flow, Reynolds number is___________________? |
| A. | 2100 |
| B. | 100 |
| C. | 0 |
| D. | ∞ |
| Answer» E. | |
| 19. |
For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively) ? |
| A. | G is above B |
| B. | B is above G |
| C. | B & G coincide |
| D. | None of these |
| Answer» C. B & G coincide | |
| 20. |
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 | |
| 21. |
For a reciprocating pump, the indicator diagram is the graph between the________________? |
| A. | Discharge and overall efficiency |
| B. | Volume swept by piston for one complete revolution and the pressure in the cylinder |
| C. | Angle swept by the crank pin at any instant and the discharge |
| D. | None of these |
| Answer» C. Angle swept by the crank pin at any instant and the discharge | |
| 22. |
For a given Reynolds number, in a hydraulically smooth pipe, further smoothening ____________ the friction factor? |
| A. | Brings about no further reduction of |
| B. | Increases |
| C. | Decreases |
| D. | None of these |
| Answer» B. Increases | |
| 23. |
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 | |
| 24. |
For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the___________________? |
| A. | Square of the radial distance |
| B. | Radial distance linearly |
| C. | Inverse of the radial distance |
| D. | Elevation along vertical direction |
| Answer» B. Radial distance linearly | |
| 25. |
Foot valves are provided in the suction line of a centrifugal pump to ____________________? |
| A. | Avoid priming, every time we start the pump |
| B. | Remove the contaminant present in the liquid |
| C. | Minimise the fluctuation in discharge |
| D. | Control the liquid discharge |
| Answer» B. Remove the contaminant present in the liquid | |
| 26. |
Foot valves provided in pumps are ____________ valves? |
| A. | Relief |
| B. | Three/four way |
| C. | Pressure reducing |
| D. | Directional control |
| Answer» E. | |
| 27. |
Foot valve provided in the pump is a ______________ valve? |
| A. | Direction control |
| B. | Back pressure |
| C. | Relief |
| D. | Pressure reduction |
| Answer» C. Relief | |
| 28. |
Fluidised beds are formed, when the__________________? |
| A. | Fluid friction is zero |
| B. | Gravity force is less than the fluid friction |
| C. | Pressure forces equal gravity forces |
| D. | Sum of the fluid friction and pressure forces is equal and opposite to gravity forces |
| Answer» C. Pressure forces equal gravity forces | |
| 29. |
Fluid resistance to shear depends upon its_______________? |
| A. | Rate of transfer of molecular momentum |
| B. | Cohesion |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 30. |
Fluid flow in a/an ______________ is an example of pressure flow? |
| A. | Partially filled pipeline |
| B. | Pipe |
| C. | Open channel |
| D. | River |
| Answer» C. Open channel | |
| 31. |
Fluid flow through a packed bed is represented by the ______________ equation? |
| A. | Fanning’s |
| B. | Ergun’s |
| C. | Hagen-Poiseuille’s |
| D. | None of these |
| Answer» C. Hagen-Poiseuille’s | |
| 32. |
Fluid flow at increasing rate through a diverging pipe is an example of ______________ flow? |
| A. | Steady uniform |
| B. | Non-steady uniform |
| C. | Steady non-uniform |
| D. | Non-steady non-uniform |
| Answer» E. | |
| 33. |
Flow measurement in an open channel is done by a/an ________________? |
| A. | Venturimeter |
| B. | Orificemeter |
| C. | Weir |
| D. | Rotameter |
| Answer» D. Rotameter | |
| 34. |
Flow rate of high velocity flue gas discharged through a stack to the atmosphere can be most conveniently measured by a _________________? |
| A. | Pitot tube |
| B. | Manometer |
| C. | Rotameter |
| D. | None of these |
| Answer» B. Manometer | |
| 35. |
____________ flow means the flow of incompressible fluid with no shear ? |
| A. | Potential |
| B. | Streamline |
| C. | Creep |
| D. | Boundary layer |
| Answer» B. Streamline | |
| 36. |
Fanning friction factor is equal to (where, fB = Blasius friction factor) ? |
| A. | fB/4 |
| B. | fB/2 |
| C. | 4fB |
| D. | 2fB |
| Answer» B. fB/2 | |
| 37. |
Fanning friction factor equation applies to the _____________ fluid flow? |
| A. | Non-isothermal condition of |
| B. | Compressible |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» E. | |
| 38. |
Fanning friction factor for laminar flow of fluid in a circular pipe is____________________? |
| A. | Not a function of the roughness of pipe wall |
| B. | Inversely proportional to Reynolds number |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 39. |
Fanning equation is given by (ΔP/ρ) = 4f (L/D) (v2/2gc). It is applicable to _____________ region flow? |
| A. | Transition |
| B. | Laminar |
| C. | Turbulent |
| D. | Both B. and C. |
| Answer» E. | |
| 40. |
f = 16/NRe, is valid for__________________? |
| A. | Turbulent flow |
| B. | Laminar flow through an open channel |
| C. | Steady flow |
| D. | None of these |
| Answer» E. | |
| 41. |
Experimental study of laminar fluid flow through a circular tube was conducted by____________________? |
| A. | Reynolds |
| B. | Hagen and Poiseuille |
| C. | Pascal |
| D. | Blake-Plummer |
| Answer» C. Pascal | |
| 42. |
Existence of boundary layer in fluid flow is because of the_________________? |
| A. | Surface tension |
| B. | Fluid density |
| C. | Fluid viscosity |
| D. | Gravity forces |
| Answer» D. Gravity forces | |
| 43. |
Euler’s equation of motion states, that at every point, the_________________? |
| A. | Fluid momentum is constant |
| B. | Force per unit mass equals acceleration |
| C. | Rate of mass outflow is equal to the rate of mass inflow |
| D. | None of these |
| Answer» C. Rate of mass outflow is equal to the rate of mass inflow | |
| 44. |
Euler’s equation of motion is a statement expressing____________________? |
| A. | Conservation of mass |
| B. | Conservation of energy |
| C. | Newton’s first law of motion |
| D. | Newton’s second law of motion |
| Answer» B. Conservation of energy | |
| 45. |
Erosion and pits formation on the impeller of a centrifugal pump may be due to________________? |
| A. | Cavitation |
| B. | Low speed of impeller |
| C. | Its operation with delivery valve closed for considerable time after starting the pump |
| D. | Off centering of pump with motor |
| Answer» B. Low speed of impeller | |
| 46. |
Equivalent length of a pipe fitting is____________________? |
| A. | Dependent on Reynolds number |
| B. | Independent of Reynolds number |
| C. | Dependent on the length of the pipe |
| D. | None of these |
| Answer» B. Independent of Reynolds number | |
| 47. |
Enamels and paints are generally _______________ fluid? |
| A. | Rheopectic |
| B. | Pseudo-plastic |
| C. | Thixotropic |
| D. | Dilatant |
| Answer» C. Thixotropic | |
| 48. |
Efficiency of power transmission (ε) through a circular pipe is given by (ht – hf)/ht, which has a maximum value of _____________ percent? |
| A. | 33:3 |
| B. | 50 |
| C. | 66.6 |
| D. | 88.8 |
| Answer» D. 88.8 | |
| 49. |
Each term in Bernoulli‟s equation represents the _____________ of the fluid? |
| A. | Energy per unit mass |
| B. | Energy per unit weight |
| C. | Force per unit mass |
| D. | None of these |
| Answer» C. Force per unit mass | |
| 50. |
Each term of the Bernoulli’s equation written in the form, (p/ρ) + (g/gc). Z + (v2/2gc) = constant, represents the total energy per unit ________________? |
| A. | Mass |
| B. | Volume |
| C. | Specific weight |
| D. | None of these |
| Answer» B. Volume | |