Explore topic-wise MCQs in Chemical Engineering.

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.

701.

The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is$?

A. 0.5
B. 1
C. 1.5
D. 2
Answer» E.
702.

Stoke's equation is valid in the Reynolds number range$?

A. 0.01 to 0.1
B. 0.1 to 2
C. 2 to 10
D. 10 to 100
Answer» B. 0.1 to 2
703.

Prandtl mixing length is$?

A. Applicable to laminar flow problems
B. A universal constant
C. Zero at the pipe wall
D. None of these
Answer» D. None of these
704.

__________ flow means the flow of incompressible fluid with no shear.$?

A. Potential
B. Streamline
C. Creep
D. Boundary layer
Answer» B. Streamline
705.

Working of a __________ pump characterises mixed flow.$?

A. Turbine
B. Piston
C. Diaphragm
D. None of these
Answer» B. Piston
706.

Viscosity of water at 40°C lies in the range of$?

A. 1 x 10⁻³ to 2 x 10⁻³ kg/m.s
B. 0.5 x 10⁻³ to 1 x 10⁻³ kg/m.s
C. 1 to 2 kg/m.s
D. 0.5 to 1 kg/m.s
Answer» C. 1 to 2 kg/m.s
707.

Which of the following equations applies to the fluid flow through a packed bed for very large Reynolds number?$?

A. Fanning equation
B. Blake-Pllummer equation
C. Hagen-Poiseulle equation
D. Kozney-Karman equation
Answer» C. Hagen-Poiseulle equation
708.

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
709.

The pressure intensity is the same in all directions at a point in a fluid$?

A. Only when the fluid is frictionless
B. Only when the fluid is at rest having zero velocity
C. When there is no motion of one fluid layer relative to an adjacent layer
D. Regardless of the motion of one fluid layer relative to an adjacent layer
Answer» D. Regardless of the motion of one fluid layer relative to an adjacent layer
710.

What is the maximum theoretical suction lift (metres) of a reciprocating pump?$?

A. 5
B. 10
C. 50
D. 100
Answer» C. 50
711.

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

A. Increases linearly with V
B. Decreases linearly with V
C. Decreases as V²
D. None of these
Answer» B. Decreases linearly with V
712.

A differential pressure cell is used for$?

A. Measuring small pressure difference in gases
B. Measuring small pressure difference in liquids
C. Remote recording of pressure difference
D. Measuring the difference of the impact & the static pressure
Answer» D. Measuring the difference of the impact & the static pressure
713.

Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition.$?

A. ‚Äö√ √á/‚Äö√ √át = 0
B. ‚Äö√ √á/‚Äö√ √át = constant
C. ‚Äö√ √á/‚Äö√ √ás = 0
D. ‚Äö√ √á/‚Äö√ √át = constant
Answer» D. ‚Äö√ √á/‚Äö√ √át = constant
714.

Toothpaste is a$?

A. Bingham plastic
B. Pseudoplastic
C. Newtonion liquid
D. Dilatent
Answer» E.
715.

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
716.

In case of supersonic flow of a fluid through pipeline, the 'Mach number' is$?

A. 0
B. 1
C. < 1
D. > 1
Answer» E.
717.

What is the unit of kinematic viscosity in SI unit?$?

A. m²/sec
B. N/m² . sec
C. Kg . sec/m
D. None of these
Answer» B. N/m¬¨‚â§ . sec
718.

The Navier-Stokes equation deals with the law of conservation of$?

A. Mass
B. Energy
C. Both A and B
D. Momentum
Answer» E.
719.

Surge tanks are provided in high pressure water pipelines to$?

A. Store a definte quantity ofwater all the time
B. Reduce the water hammer
C. Facilitate easy dismantling of pipeline for cleaning and maintenance
D. None of these
Answer» C. Facilitate easy dismantling of pipeline for cleaning and maintenance
720.

The maximum delivery pressure of compressors can be upto __________ atmospheres.$?

A. 10
B. 100
C. 250
D. 1000
Answer» E.
721.

It is possible to integrate an automatic flow controller to a$?

A. Flow nozzle
B. Venturimeter
C. Rotameter
D. None of these
Answer» D. None of these
722.

At a constant speed of the centrifugal pump . it __________ the impeller diameter.$?

A. Capacity varies directly with
B. Head varies as the square of
C. Horsepower varies as the cube of
D. All of the above
Answer» E.
723.

Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics.$?

A. Piston
B. Gear
C. Positive displacement
D. Sump
Answer» C. Positive displacement
724.

The dimension of kinematic viscosity is$?

A. ML⁻²T⁻¹
B. L²T⁻¹
C. ML⁻²T⁻²
D. None of these
Answer» C. ML‚Äö√Ö¬™¬¨‚â§T‚Äö√Ö¬™¬¨‚â§
725.

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
726.

With a constant diameter impeller of a centrifugal pump$?

A. Its capacity varies directly as the square of speed
B. Head varies as the square of speed
C. Horsepower input varies as the square of speed
D. Head varies as the speed
Answer» C. Horsepower input varies as the square of speed
727.

A special type of liquid transporting device is the diffuser pump, in which __________ are minimised.$?

A. Bearing losses
B. Disk friction
C. Shock losses
D. Cavitation
Answer» D. Cavitation
728.

For a particle settling in water at its terminal settling velocity, which of the following is true?$?

A. Buoyancy = weight + drag
B. Weight = buoyancy + drag
C. Drag = buoyancy + weight
D. Drag = weight
Answer» C. Drag = buoyancy + weight
729.

In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure __________ the vapor pressure of the liquid at the suction temperature.$?

A. Lower than
B. Higher than
C. Equal to
D. None of these
Answer» C. Equal to
730.

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. (≈ì√ÖH - ≈ì√ÖL)gH
731.

The discharge through a rectangular weir varies as$?

A. H1/2
B. H5/2
C. H2/5
D. H3/2
Answer» E.
732.

In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.$?

A. Inverse
B. Square root
C. Second power
D. First power
Answer» C. Second power
733.

A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m³/s? The Fanning friction factor, f is 0.0062.$?

A. 10 m
B. 11 m
C. 12 m
D. 20 m
Answer» C. 12 m
734.

Purpose of relief valve in a reciprocating pump is to$?

A. Protect the pump against developing excessive pressure
B. Facilitate unidirectional flow of liquid
C. Reduce the discharge pressure
D. Control the rate of discharge
Answer» B. Facilitate unidirectional flow of liquid
735.

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
736.

The distance between metacentre and __________ is called metacentric height.$?

A. Water surface
B. Centre of gravity
C. Centre of buoyancy
D. None of these
Answer» C. Centre of buoyancy
737.

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
738.

While starting an axial flow pump, its delivery valve should be kept$?

A. Open
B. Closed
C. Either open or closed
D. None of these
Answer» B. Closed
739.

Which of the following is an undesirable property of a manometric liquid?$?

A. Non-sticky & non-corrosive nature
B. High vapour pressure
C. Low viscosity & surface tension
D. Low co-efficient of thermal expansion
Answer» C. Low viscosity & surface tension
740.

A fluid element has a velocity V = -y¬¨‚â§ . xi + 2yx¬¨‚â§ . j. The motion at (x, y) = (l/‚Äö√ √∂2, 1) is$?

A. Rotational and incompressible
B. Rotational and compressible
C. Irrotational and compressible
D. Irrotational and incompressible
Answer» C. Irrotational and compressible
741.

What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.5)?$?

A. 0.61 - 0.63
B. 0.5 - 0.75
C. 0.75 - 0.90
D. 0.35 - 0.55
Answer» B. 0.5 - 0.75
742.

The head developed by a centrifugal pump is largely determined by the$?

A. Power of the pump
B. Nature of the liquid being pumped
C. Angle of the vanes and the speed of the tip of the impeller
D. Vapour pressure of the liquid
Answer» D. Vapour pressure of the liquid
743.

The velocity distribution in direction normal to the direction of flow in plane Poiseuille flow is$?

A. Hyperbolic
B. Parabolic
C. Linear
D. None of these
Answer» C. Linear
744.

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
745.

Co-efficient of velocity is __________ the coefficient of discharge.$?

A. Less than
B. More than
C. Equal to
D. Not related to
Answer» C. Equal to
746.

Which of the following valves will incur maximum pressure drop for the same discharge of water?$?

A. Globe valve
B. Gate valve
C. Needle valve
D. Butterfly valve
Answer» D. Butterfly valve
747.

A bed consists of particles of density 2000 kg/m³. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is$?

A. 25.61 kPa
B. 11.77 kPa
C. 14.86 kPa
D. 21.13 kPa
Answer» C. 14.86 kPa
748.

Friction factor for a hydraulically smooth pipe at NRe = 2100 is f‚ÇÅ. 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
749.

A pressure head of 320 metres of water in meters of CCl‚ÇÑ (sp.gr = 1.6) will be$?

A. 100
B. 200
C. 320
D. 160
Answer» C. 320
750.

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