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.
| 551. |
_ The pressure co-efficient is the ratio of pressure forces to __________ forces.$? |
| A. | Viscous |
| B. | Inertial |
| C. | Gravity |
| D. | Surface tension |
| Answer» B. Inertial | |
| 552. |
_ In a dry packed bed, the pressure drop will be changed by increasing the flow rate as$? |
| A. | V1.8 |
| B. | V-0.8 |
| C. | V |
| D. | V-1 |
| Answer» B. V-0.8 | |
| 553. |
_ Choking in case of pipe flow means that a$? |
| A. | Specified mass flow rate can not be achieved |
| B. | Valve is closed in the line |
| C. | Restriction in flow cross-section area occurs |
| D. | None of these |
| Answer» B. Valve is closed in the line | |
| 554. |
_ Check in a centrifugal pump is$? |
| A. | Provided in the discharge line |
| B. | Generally a globe valve |
| C. | Provided to prevent liquid from backing up through the pump when the pump is turned off or accidently stops running |
| D. | All of the above |
| Answer» E. | |
| 555. |
_ The ratio of the wall drag to the form drag in the Stoke's law range (for motion of spherical particles in a stationary fluid) is$? |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 0.33 |
| Answer» D. 0.33 | |
| 556. |
_ The head loss due to sudden contraction is proportional to$? |
| A. | Velocity |
| B. | Velocity head |
| C. | Turbulence |
| D. | None of these |
| Answer» C. Turbulence | |
| 557. |
_ The fluid property, due to which, mercury does not wet the glass is$? |
| A. | Surface tension |
| B. | Viscosity |
| C. | Cohesion |
| D. | Adhesion |
| Answer» B. Viscosity | |
| 558. |
_ A liquid is pumped at the rate of 600 litres using 1000 rpm. If the rpm is changed to 1100, the liquid pumped is __________ litres.$? |
| A. | 600 |
| B. | 660 |
| C. | 1.1 |
| D. | 60 |
| Answer» C. 1.1 | |
| 559. |
__The range of a particular rotameter can be increased by__ |
| A. | Use of floats of different densities |
| B. | No means |
| C. | Increasing the diameter of the float |
| D. | Decreasing the diameter of the float |
| Answer» B. No means | |
| 560. |
__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 B |
| Answer» C. Both A & B | |
| 561. |
__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 | |
| 562. |
__Which of the following is most prone to pulsating discharge flow ?__ |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Gear pump |
| D. | Axial flow pump |
| Answer» D. Axial flow pump | |
| 563. |
__Two piping system are said to be equivalent, when the __________ are same.__ |
| A. | Fluid flow rate & friction loss |
| B. | Length & friction factor |
| C. | Diameter & friction factor |
| D. | Length & diameter |
| Answer» B. Length & friction factor | |
| 564. |
__A fluidis (μ/ρ = 0.01 cm²/sec) moving at critical flow condition (NRe = 2100) through a pipe of dia 3 cms. Velocity of flow is __________ cm/sec.__ |
| A. | 7 |
| B. | 700 |
| C. | 7000 |
| D. | 630 |
| Answer» B. 700 | |
| 565. |
__Vena-contracta pressure tapping is at a distance __________ from the position of an orificemeter fitted in a pipe of internal diameter 'd'__ |
| A. | D |
| B. | 0.5d |
| C. | 2d |
| D. | 4d |
| Answer» C. 2d | |
| 566. |
__A piezometer provided in the pipe measures__ |
| A. | Friction factor |
| B. | Static pressure |
| C. | Dynamic pressure |
| D. | None of these |
| Answer» C. Dynamic pressure | |
| 567. |
__Sewage sludge is __________ type of non-Newtonion fluid.__ |
| A. | Dilatant |
| B. | Bingham plastic |
| C. | Pseudo plastic |
| D. | None of these |
| Answer» C. Pseudo plastic | |
| 568. |
__Dimension of surface tension is(where, F = force, L = length)__ |
| A. | FL⁻¹ |
| B. | F⁻¹ . L |
| C. | F.L⁻² |
| D. | F⁻² . L |
| Answer» B. F‚Äö√Ö¬™¬¨œÄ . L | |
| 569. |
__For the production of very high vacuum, a __________ pump is normally used.__ |
| A. | Diffusion |
| B. | Centrifugal |
| C. | Jet ejector |
| D. | Piston |
| Answer» B. Centrifugal | |
| 570. |
__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. | |
| 571. |
__Viscosity of a liquid decreases __________ with rise in temperature.__ |
| A. | Exponentially |
| B. | Linearly |
| C. | Logarithmically |
| D. | None of these |
| Answer» D. None of these | |
| 572. |
__Glass pipes can be joined by__ |
| A. | Flanges |
| B. | Welding |
| C. | Soldering |
| D. | Bell and spigot joint |
| Answer» E. | |
| 573. |
__A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpmHead = 8 metresFlow = 1000 litres/minutes.If its speed is halved, then the new head will be __________ metres.__ |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 5.5 |
| Answer» B. 4 | |
| 574. |
__If Blausius or Darcey friction factor is 'f‚ÇÅ' then the Fanning friction factor is equal to__ |
| A. | f‚ÇÅ/4 |
| B. | 4F‚ÇÇ |
| C. | 2f‚ÇÅ |
| D. | f‚ÇÅ/2 |
| Answer» B. 4F‚Äö√á√á | |
| 575. |
__Critical velocity in a pipe flow__ |
| A. | Increases as fluid viscosity increases |
| B. | Increases as pipe diameter increases |
| C. | Independent of fluid density |
| D. | None of these |
| Answer» C. Independent of fluid density | |
| 576. |
__Plunger pumps are used for__ |
| A. | Higher pressure |
| B. | Slurries |
| C. | Viscous mass |
| D. | None of these |
| Answer» B. Slurries | |
| 577. |
__Lower BWG means __________ of the tube.__ |
| A. | Lower thickness |
| B. | Lower cross-section |
| C. | Outer diameter |
| D. | Inner diameter |
| Answer» C. Outer diameter | |
| 578. |
__The maximum delivery pressure of a reciprocating compressor may be about __________ kg/cm².__ |
| A. | 1000 |
| B. | 2000 |
| C. | 3000 |
| D. | 4000 |
| Answer» E. | |
| 579. |
__Navier-Stokes equation is useful in the analysis of __________ fluid flow problems.__ |
| A. | Non-viscous |
| B. | Viscous |
| C. | Turbulent |
| D. | Rotational |
| Answer» C. Turbulent | |
| 580. |
__Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases.__ |
| A. | NPSH required |
| B. | BHP required by the pump |
| C. | Head of the liquid pumped |
| D. | All of the above |
| Answer» E. | |
| 581. |
__Cavitation occurs in a centrifugal pump when the suction pressure is__ |
| A. | Less than the vapour pressure of the liquid at that temperature |
| B. | Greater than the vapour pressure of the liquid at that temperature |
| C. | Equal to the vapour pressure |
| D. | Equal to the developed head |
| Answer» B. Greater than the vapour pressure of the liquid at that temperature | |
| 582. |
__In which of the following cases, it is possible for flow to occur from low pressure to high pressure?__ |
| A. | Flow of liquid upward in a vertical pipe |
| B. | Flow through a converging section |
| C. | Flow of air downward in a pipe |
| D. | Impossible in a constant cross-section conduit |
| Answer» C. Flow of air downward in a pipe | |
| 583. |
__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 | |
| 584. |
__The pump used for irrigation purposes is generally designed for__ |
| A. | Large capacity & high head |
| B. | Large capacity & low head |
| C. | Small capacity & high head |
| D. | Small capacity & low head |
| Answer» C. Small capacity & high head | |
| 585. |
__A stream line is__ |
| A. | Fixed in space in steady flow |
| B. | Always the path of particle |
| C. | Drawn normal to the velocity vector at every point |
| D. | A line connecting the mid points of flow cross-section |
| Answer» B. Always the path of particle | |
| 586. |
_Stoke's law is valid, when NNRe,p is less than$? |
| A. | 2 |
| B. | 100 |
| C. | 2100 |
| D. | 700 |
| Answer» B. 100 | |
| 587. |
_With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost$? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Increases exponentially |
| Answer» C. Remains unchanged | |
| 588. |
_Dimension of absolute viscosity is$? |
| A. | ML⁻¹T⁻¹ |
| B. | MLT⁻¹ |
| C. | ML⁻¹T |
| D. | MLT |
| Answer» B. MLT‚Äö√Ö¬™¬¨œÄ | |
| 589. |
_An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonion fluid beyond yield stress. Which of the following is an ideal plastic?$? |
| A. | Sewage sludge |
| B. | Rubber latex |
| C. | Blood |
| D. | Sugar solution |
| Answer» B. Rubber latex | |
| 590. |
_Fanning friction factor for laminar flow of fluid in a circular pipe is$? |
| A. | Not a function of the roughness of pipe wall |
| B. | Inversely proportional to Reynolds number |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 591. |
_For pumping slurry, one can use a __________ pump.$? |
| A. | Reciprocating |
| B. | Diaphargm |
| C. | Centrifugal |
| D. | Pneumatic |
| Answer» C. Centrifugal | |
| 592. |
_In the low Reynolds number region, the drag force on a sphere is proportional to$? |
| A. | V |
| B. | V2 |
| C. | V4 |
| D. | V0.5 |
| Answer» B. V2 | |
| 593. |
_Velocity head on sudden enlargement in a horizontal pipe is converted into __________ head.$? |
| A. | Elevation |
| B. | Pressure |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» C. Both A and B | |
| 594. |
_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$? |
| A. | More |
| B. | Less |
| C. | Equal |
| D. | Either A or B; depends on the viscosity of the fluid |
| Answer» B. Less | |
| 595. |
_In an incompressible fluid, the density is$? |
| A. | Greatly affected by moderate changes in pressure |
| B. | Greatly affected only by moderate changes in temperature |
| C. | Not affected with moderate change in temperature & pressure |
| D. | Sensible to changes in both temperature & pressure |
| Answer» D. Sensible to changes in both temperature & pressure | |
| 596. |
_Major loss in sudden contraction in pipe flow is due to$? |
| A. | Boundary friction |
| B. | Flow contraction |
| C. | Expansion of flow after sudden contraction |
| D. | None of these |
| Answer» C. Expansion of flow after sudden contraction | |
| 597. |
_Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible?$? |
| A. | < 0.3 |
| B. | > 3 |
| C. | 50 |
| D. | 1 |
| Answer» B. > 3 | |
| 598. |
_Which is the correct relationship for a centrifugal pump? (where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm)$? |
| A. | D = 1840 H0.5/N |
| B. | D = 1840 N/H0.5 |
| C. | H = 1840 D0.5/N |
| D. | D = 1840 H/N |
| Answer» B. D = 1840 N/H0.5 | |
| 599. |
_Which of the following conditions must be satisfied for lift force to be developed?$? |
| A. | The body should be bluff body |
| B. | The body should be stream lined |
| C. | Circulation around the body is essentially required |
| D. | The main stream velocity must approach the velocity of sound in that fluid medium |
| Answer» D. The main stream velocity must approach the velocity of sound in that fluid medium | |
| 600. |
_Unsteady uniform flow is represented by flow through a/an$? |
| A. | Long pipe at constant rate |
| B. | Long pipe at decreasing rate |
| C. | Expanding tube at increasing rate |
| D. | Expanding tube at constant rate |
| Answer» C. Expanding tube at increasing rate | |