MCQOPTIONS
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MCQOPTIONS
This section includes 659 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. |
Cd, Cc and Cv are related (for flow through an orifice) as (where, Cd = discharge co-efficient, Cc = co-efficient of contraction = (area of jet at vena-contracta/area of opening), Cv = co-efficient of velocity = (actual velocity at vena-contracta/theoretical velocity)? |
| A. | Cd = Cc/Cv |
| B. | Cd = Cc.Cv |
| C. | Cd = Cv/ Cc |
| D. | None of these |
| Answer» C. Cd = Cv/ Cc | |
| 552. |
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 | |
| 553. |
Cavitation in a centrifugal pump can be avoided by keeping the__________________? |
| A. | Inlet pressure high |
| B. | Outlet pressure low |
| C. | Inlet pressure low |
| D. | Outlet pressure high |
| Answer» B. Outlet pressure low | |
| 554. |
Cavitation can be prevented by________________? |
| A. | Suitably designing the pump |
| B. | Maintaining the suction head sufficiently greater than the vapour pressure |
| C. | Maintaining suction head = developed head |
| D. | Maintaining suction head lower than the vapour pressure |
| Answer» C. Maintaining suction head = developed head | |
| 555. |
Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, ζ = surface tension of mercury)____________________? |
| A. | d |
| B. | 1/d |
| C. | ζ |
| D. | 1/ζ |
| Answer» D. 1/ζ | |
| 556. |
Capillary tube method of viscosity measurement is based on the ________________? |
| A. | Hagen-Poiseuille’s equation |
| B. | Stoke’s law |
| C. | Navier-stokes equation |
| D. | None of these |
| Answer» B. Stoke’s law | |
| 557. |
Capacity of a rotary gear pump can be varied by__________________? |
| A. | Changing the speed of rotation |
| B. | Bleeding air into suction |
| C. | Bypassing liquid from the suction or discharge line |
| D. | All A., B. and C. |
| Answer» E. | |
| 558. |
Capacity of a hydraulic accumulator is defined in terms of maximum_____________________? |
| A. | Amount of energy stored |
| B. | Flow rate through accumulator |
| C. | Rate of falling of ram |
| D. | Volume available in the cylinder |
| Answer» B. Flow rate through accumulator | |
| 559. |
Buoyant force__________________? |
| A. | For non-symmetrical bodies is not vertical |
| B. | Depends on the depth of the submergence of the floating body |
| C. | Depends on the weight of the floating body |
| D. | None of these |
| Answer» D. None of these | |
| 560. |
Buckingham-π theorem states that in any physical problem including ‘n’ quantities having ‘m’ dimensions, the quantities can be arranged into _____________ independent dimensionless parameters? |
| A. | m |
| B. | n |
| C. | n-m |
| D. | n-m |
| Answer» D. n-m | |
| 561. |
Brownian movement is prominent in the particle size range of _____________ microns in case of settling of a particle in a fluid? |
| A. | 2 to 3 |
| B. | 0.01 to 0.10 |
| C. | 200 to 300 |
| D. | 100 to 1000 |
| Answer» B. 0.01 to 0.10 | |
| 562. |
Boundary layer thickness in turbulent flow over a flat plate increases as(where, d = distance from the leading edge.) ? |
| A. | √d |
| B. | √d |
| C. | d4/5 |
| D. | d1/3 |
| Answer» D. d1/3 | |
| 563. |
Boundary layer thickness in laminar flow over a flat plate increases as(where, d = distance from the leading edge.) ? |
| A. | √d |
| B. | d1/3 |
| C. | d2 |
| D. | d2/3 |
| Answer» B. d1/3 | |
| 564. |
Boundary layer separation occurs when the____________________? |
| A. | Pressure reaches a minimum |
| B. | Cross-section of the channel is reduced |
| C. | Valve is closed in a pipeline |
| D. | Velocity of sound is reached |
| Answer» C. Valve is closed in a pipeline | |
| 565. |
Boundary layer separation is characterised by one of the conditions given below, where ‘Re’ is the Reynolds number for the flow. Select the appropriate conditions ? |
| A. | Re <> 1, accelerating flow |
| B. | Re << 1, decelerating flow |
| C. | Re >>1, decelerating flow |
| Answer» D. | |
| 566. |
Boundary layer separation is caused by the_________________? |
| A. | Reduction of pressure to vapour pressure |
| B. | Boundary layer thickness reducing to zero |
| C. | Adverse pressure gradient |
| D. | Reduction of pressure gradient to zero |
| Answer» E. | |
| 567. |
Boundary layer separation is caused by the ____________________? |
| A. | Reduction of pressure below vapour pressure |
| B. | Reduction of pressure gradient to zero |
| C. | Adverse pressure gradient |
| D. | Reduction of boundary layer thickness to zero |
| Answer» D. Reduction of boundary layer thickness to zero | |
| 568. |
Boundary layer exists in flow_________________? |
| A. | Of real fluids |
| B. | Over flat surfaces only |
| C. | In pipes only |
| D. | Of ideal fluids only |
| Answer» B. Over flat surfaces only | |
| 569. |
Boiler feed water pump is usually a ______________ pump? |
| A. | Reciprocating |
| B. | Gear |
| C. | Multistage centrifugal |
| D. | Diaphragm |
| Answer» D. Diaphragm | |
| 570. |
Bernoulli’s equation is not applicable, when the flow is___________________? |
| A. | Irrotational |
| B. | Incompressible |
| C. | Viscous |
| D. | All A., B. & C. |
| Answer» E. | |
| 571. |
Bernoulli’s equation for steady, frictionless, continuous flow states that the ______________ at all sections is same? |
| A. | Total pressure |
| B. | Total energy |
| C. | Velocity head |
| D. | None of these |
| Answer» C. Velocity head | |
| 572. |
Bernoulli’s equation is dependent on the__________________? |
| A. | First law of thermodynamics |
| B. | Third law of thermodynamics |
| C. | Law of conservation of momentum |
| D. | None of these |
| Answer» E. | |
| 573. |
Bernoulli’s equation describes the _______________? |
| A. | Mechanical energy balance in potential flow |
| B. | Kinetic energy balance in laminar flow |
| C. | Mechanical energy balance in turbulent flow |
| D. | Mechanical energy balance in boundary layer |
| Answer» B. Kinetic energy balance in laminar flow | |
| 574. |
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? A. Fluid flow is frictionless & irrotational. B. Fluid flow is steady. C. Fluid flow is uniform & turbulent. D. Fluid is compressible. E. Fluid is incompressible ? |
| A. | A, C, D |
| B. | B, D, E |
| C. | A, B, E |
| D. | A, D, E |
| Answer» D. A, D, E | |
| 575. |
Bernoulli‟s equation does not apply to the functioning of a/an__________________? |
| A. | Venturimeter |
| B. | Orificemeter |
| C. | pitot tube |
| D. | None of these |
| Answer» E. | |
| 576. |
Bernoulli’s equation accounts for the_____________________? |
| A. | Various momentums |
| B. | Various masses |
| C. | Different forms of mechanical energy |
| D. | None of these |
| Answer» D. None of these | |
| 577. |
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 | |
| 578. |
Baffles in mixing tanks are provided to__________________? |
| A. | Reduce swirling and vortex formation |
| B. | Increase the structural strength of the tank |
| C. | Aid in rotational flow |
| D. | None of these |
| Answer» B. Increase the structural strength of the tank | |
| 579. |
At low Reynolds number______________? |
| A. | Viscous forces are unimportant |
| B. | Viscous forces control |
| C. | Viscous forces control and inertial forces are unimportant |
| D. | Gravity forces control |
| Answer» D. Gravity forces control | |
| 580. |
At high Reynolds number_________________? |
| A. | Inertial forces control and viscous forces are unimportant |
| B. | Viscous forces predominate |
| C. | Inertial forces are unimportant and viscous forces control |
| D. | None of these |
| Answer» B. Viscous forces predominate | |
| 581. |
At a constant speed of the centrifugal pump, it‟s _____________ the impeller diameter? |
| A. | Capacity varies directly with |
| B. | Head varies as the square of |
| C. | Horsepower varies as the cube of |
| D. | All A., B. and C. |
| Answer» E. | |
| 582. |
Assuming flow to be laminar, if the diameter of the pipe is halved, then the pressure drop will_______________? |
| A. | Increase |
| B. | Decrease |
| C. | Remain same |
| D. | Be quadrupled |
| Answer» B. Decrease | |
| 583. |
As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1 ? |
| A. | Increases linearly with V |
| B. | Decreases linearly with V |
| C. | Decreases as V2 |
| D. | None of these |
| Answer» B. Decreases linearly with V | |
| 584. |
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. μ2 | |
| 585. |
Applying a pressure drop across a capillary results in a volumetric flow rate ‘Q’ under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is____________________? |
| A. | Q/2 |
| B. | Q/4 |
| C. | Q/8 |
| D. | Q/16 |
| Answer» E. | |
| 586. |
Applicability of Bernoulli’s equation is limited to a/an _____________ fluid, that does not exchange shaft work with the surroundings? |
| A. | Incompressible |
| B. | Non-viscous |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 587. |
An isentropic process is the one, in which_________________? |
| A. | pv = constant |
| B. | pvr= constant |
| C. | pvr = constant, and process is reversible |
| D. | None of these |
| Answer» D. None of these | |
| 588. |
An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonian 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 | |
| 589. |
An ideal nozzle design aims at________________? |
| A. | Minimising wall friction |
| B. | Suppressing boundary layer separation |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 590. |
An ideal fluid is___________________? |
| A. | Frictionless & incompressible |
| B. | One, which obeys Newton’s law of viscosity |
| C. | Highly viscous |
| D. | None of these |
| Answer» B. One, which obeys Newton’s law of viscosity | |
| 591. |
An equipotential line is _____________ to the velocity vector at every point? |
| A. | Normal |
| B. | Parallel |
| C. | Tangential |
| D. | None of these |
| Answer» B. Parallel | |
| 592. |
All pipes of a particular nominal size have the same_________________? |
| A. | Inside diameter |
| B. | Outside diameter |
| C. | Thickness |
| D. | None of these |
| Answer» C. Thickness | |
| 593. |
Air vessel provided in a reciprocating pump__________________? |
| A. | Smoothens the flow by avoiding pulsations |
| B. | Increases the volumetric efficiency of the pump |
| C. | Saves the pump from the danger of cavitation |
| D. | None of these |
| Answer» E. | |
| 594. |
Air vessel provided in a reciprocating pump is for__________________? |
| A. | Increasing the acceleration head |
| B. | Making the friction in pipe uniform |
| C. | Decreasing the acceleration head |
| D. | None of these |
| Answer» C. Decreasing the acceleration head | |
| 595. |
Air vessel of a reciprocating pump is initially filled with___________________? |
| A. | Atmospheric air |
| B. | Compressed air |
| C. | Water |
| D. | None of these |
| Answer» C. Water | |
| 596. |
Air vessel fitted to a reciprocating pump____________________? |
| A. | Increases the work done |
| B. | Decreases the work done |
| C. | Causes cavitation |
| D. | Results in non-uniform discharge |
| Answer» C. Causes cavitation | |
| 597. |
Actual lift of a pump is always less than the theoretical lift and is limited by the__________________________? |
| A. | Specific gravity & temperature of the liquid |
| B. | Leakage & pressure decreasing at higher elevations |
| C. | Frictional resistance through pipes, fittings & passages |
| D. | All A., B. and C. |
| Answer» E. | |
| 598. |
Acceleration head in a reciprocating pump_______________________? |
| A. | Increases the work done during delivery stroke |
| B. | Decreases the work done during suction stroke |
| C. | Does not change the work requirement of the pump |
| D. | Increases the work done during suction stroke |
| Answer» D. Increases the work done during suction stroke | |
| 599. |
Absolute viscosity of a fluid is a function of the __________ of the fluid? |
| A. | Motion |
| B. | Pressure & temperature |
| C. | Shearing stress |
| D. | Both B. & C. |
| Answer» E. | |
| 600. |
A weir is used to measure the large water discharge rate from a river or from an open channel. A weir is not of _______________ shape? |
| A. | Circular |
| B. | Rectangular |
| C. | Triangular |
| D. | Trapezoidal |
| Answer» B. Rectangular | |