MCQOPTIONS
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MCQOPTIONS
This section includes 1608 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 851. |
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 | |
| 852. |
A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below :Δ P/L = 375 x 10³ VOM + 10.94 x 10⁶ V²OM (SI units) If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ?? |
| A. | 0.2 |
| B. | 0.5 |
| C. | 0.7 |
| D. | 0.8 |
| Answer» D. 0.8 | |
| 853. |
In area meter (e.g., rotameter), with increase in the fluid flow rate, the? |
| A. | Pressure drop increases linearly |
| B. | Pressure drop is almost constant |
| C. | Area through which fluid flows does not vary |
| D. | None of these |
| Answer» C. Area through which fluid flows does not vary | |
| 854. |
The rate of change of moment of momentum represents the __________ by the fluid.? |
| A. | Torque applied |
| B. | Force exerted |
| C. | Work done |
| D. | Power developed |
| Answer» B. Force exerted | |
| 855. |
Pressure drop (Δp) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as$ |
| A. | V1.8 |
| B. | V-0.2 |
| C. | V2.7 |
| D. | V2 |
| Answer» E. | |
| 856. |
For a given fluid flow rate, which of the following incurs maximum head loss? |
| A. | Orifice meter |
| B. | Venturimeter |
| C. | Flow nozzle |
| D. | All of the above |
| Answer» B. Venturimeter | |
| 857. |
Which of the following is a dimensionless parameter? |
| A. | Angular velocity |
| B. | Specific weight |
| C. | Kinematic viscosity |
| D. | None of these |
| Answer» E. | |
| 858. |
What causes cavitation in centrifugal pump? |
| A. | High suction pressure |
| B. | Low barometric pressure |
| C. | Low suction pressure |
| D. | High suction velocity |
| Answer» D. High suction velocity | |
| 859. |
A 2" gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is$ |
| A. | Δp |
| B. | < Δp |
| C. | > Δp |
| D. | Δp² |
| Answer» D. ≈í√Æp¬¨‚⧠| |
| 860. |
A Newtonion liquid (ρ = density, μ = viscosity) is flowing with velocity v in a tube of diameter 'D'. Let Δp be the pressure drop across the length 'L'. For a laminar flow, Δp is proportional to$ |
| A. | L ρv²/D |
| B. | L μ;V/D² |
| C. | D ρv²/L |
| D. | Μ V/L |
| Answer» B. L ≈í¬∫;V/D¬¨‚⧠| |
| 861. |
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 change? |
| A. | Rotation |
| B. | Translation |
| C. | Linear deformation |
| D. | Angular deformation |
| Answer» E. | |
| 862. |
Which of the following is not concerned with the fluid-particle interaction? |
| A. | Drag co-efficient |
| B. | Froude number |
| C. | Galileo number |
| D. | Weber number |
| Answer» E. | |
| 863. |
What is the normal range of exit cone angle of a venturimeter? |
| A. | 2 to 5 |
| B. | 7 to 15 |
| C. | 15 to 25 |
| D. | >25 |
| Answer» C. 15 to 25 | |
| 864. |
Bernoulli's equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli's equation ?1. Fluid flow is frictionless & irrotational.2. Fluid flow is steady.3. Fluid flow is uniform & turbulent.4. Fluid is compressible.5. Fluid is incompressible. |
| A. | 1, 3, 3 |
| B. | 2, 3, 4 |
| C. | 1, 2, 4 |
| D. | 1, 3, 4 |
| Answer» D. 1, 3, 4 | |
| 865. |
The energy loss over a length of pipeline according to Darcy-Weisbach equation for pipe flow is _________ the mean velocity of flow. |
| A. | Directly proportional to |
| B. | Directly proportional to square of |
| C. | Inversely proportional to |
| D. | Inversely proportional to square of |
| Answer» C. Inversely proportional to | |
| 866. |
Which of the following properties of a fluid is responsible for offering resistance to shear? |
| A. | Surface tension |
| B. | Viscosity |
| C. | Specific gravity |
| D. | All of the above |
| Answer» C. Specific gravity | |
| 867. |
In which of the following body shapes, the pressure drag is large compared to the friction drag? |
| A. | Stream line body |
| B. | Two dimensional body |
| C. | Bluff body |
| D. | None of these |
| Answer» D. None of these | |
| 868. |
In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where, T = absolute temperature ) |
| A. | 1/‚à öT |
| B. | 1/T |
| C. | ‚à öT |
| D. | T |
| Answer» D. T | |
| 869. |
A pressure of 10 m head of water is equivalent to __________ kN/m².$ |
| A. | 98 |
| B. | 147 |
| C. | 196 |
| D. | 49 |
| Answer» B. 147 | |
| 870. |
Which of the following produces maximum pressure difference for transportation of gases? |
| A. | Vaccum pumps |
| B. | Blowers |
| C. | Fans |
| D. | Compressors |
| Answer» E. | |
| 871. |
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) | |
| 872. |
As per Newton's law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to(where, μ = fluid viscosity)$ |
| A. | 1/μ |
| B. | μ |
| C. | μ² |
| D. | 1/μ² |
| Answer» C. ≈í¬∫¬¨‚⧠| |
| 873. |
The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is |
| A. | ‚à ö(HW/œÄ) |
| B. | HW/2(H + W)² |
| C. | HW/4(H + W)² |
| D. | 2HW/(H + W)² |
| Answer» C. HW/4(H + W)¬¨‚⧠| |
| 874. |
Which of the following is not a dimension-less parameter? |
| A. | Pressure-co-efficient |
| B. | Froude number |
| C. | Kinematic viscosity |
| D. | Weber number |
| Answer» D. Weber number | |
| 875. |
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 | |
| 876. |
N. second/m² is# |
| A. | The S.I. unit of dynamic viscosity |
| B. | The S.I. unit of kinematic viscosity |
| C. | Equivalent to one poise |
| D. | Equivalent to one stoke |
| Answer» B. The S.I. unit of kinematic viscosity | |
| 877. |
Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation? |
| A. | Decrease in effect |
| B. | Increase in thrust |
| C. | Develops noise |
| D. | Develops high pressure |
| Answer» E. | |
| 878. |
Discharge from a 24 inch pipe of water at 10 ft/sec will be __________ ft³/sec.# |
| A. | 7.65 |
| B. | 32.36 |
| C. | 48.22 |
| D. | 125.6 |
| Answer» E. | |
| 879. |
The terminal velocity of a particle moving through a fluid varies as dpn. What is the value of n' for Newton's law regime? |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 3 |
| Answer» B. 1 | |
| 880. |
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 | |
| 881. |
Which of the following flow measuring devices is an area meter? |
| A. | Venturimeter |
| B. | Orifice meter |
| C. | Anemometer |
| D. | Rotameter |
| Answer» E. | |
| 882. |
Which law/principle of solid mechanics is similar/equivalent to Newton's law of viscosity in fluid mechanics? |
| A. | Archimedes principle |
| B. | Newton |
| C. | Hooke |
| D. | Newton |
| Answer» D. Newton | |
| 883. |
Which of the following quantities are computed by using the hydraulic radius for non-circular 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 | |
| 884. |
The equation relating friction factor to Reynold number, f-0.5 = 4 loge (NRe/‚à öf)-0.4, is called the __________ equation.# |
| A. | Nikuradse |
| B. | Von-Karman |
| C. | Blausius |
| D. | Colebrook |
| Answer» B. Von-Karman | |
| 885. |
In the laminar boundary layer flow over a flat plate, the ratio (δ/x) varies as :(where, 'δ' is the boundary layer thickness and 'x' is the distance from the leading edge in the direction of flow).# |
| A. | Re |
| B. | ‚à öRe |
| C. | 1/Re |
| D. | Re-1/2 |
| Answer» E. | |
| 886. |
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 | |
| 887. |
Kinetic energy of fluid per unit weight represented by the velocity head is given by |
| A. | 2v2/gc |
| B. | v2/2gc |
| C. | ρv2/gc |
| D. | ρ.v2/2gc |
| Answer» C. œÅv2/gc | |
| 888. |
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 | |
| 889. |
Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation ? |
| A. | Decrease in effect |
| B. | Increase in thrust |
| C. | Develops noise |
| D. | Develops high pressure |
| Answer» E. | |
| 890. |
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 change ? |
| A. | Rotation |
| B. | Translation |
| C. | Linear deformation |
| D. | Angular deformation |
| Answer» E. | |
| 891. |
__________ forces do not act in case of fluid flow. |
| A. | Elastic |
| B. | Tensile |
| C. | Vibratory |
| D. | Centrifugal |
| Answer» C. Vibratory | |
| 892. |
Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f1 and that for smooth pipe is f2. Pick out the correct statement. |
| A. | f1 = f2 |
| B. | f1 < f2 |
| C. | f1 > f2 |
| D. | data not sufficient to relate f1 & f2 |
| Answer» D. data not sufficient to relate f1 & f2 | |
| 893. |
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 | |
| 894. |
Mass velocity in case of steady flow and through a constant cross-section conduit is independent of the |
| A. | temperature |
| B. | pressure |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 895. |
Which of the following is the 'Blaussius 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. | |
| Answer» B. f-0.5 = 4.07 loge (NRef)-0.6 | |
| 896. |
Newton's law of viscosity relates the |
| A. | shear stress and velocity. |
| B. | velocity gradient and pressure intensity. |
| C. | shear stress and rate of angular deformation in a fluid. |
| D. | pressure gradient and rate of angular deformation. |
| Answer» D. pressure gradient and rate of angular deformation. | |
| 897. |
The ratio of maximum to average velocity in case of streamline flow between parallel plates is |
| A. | 1 |
| B. | 1.5 |
| C. | 2 |
| D. | 2.5 |
| Answer» C. 2 | |
| 898. |
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 | |
| 899. |
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. | |
| 900. |
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. | |