chemical engineering MCQs – Page 135

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

6701. The temperature in isentropic flow_______________?
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A. Depends on Mach number only

B. None of these

C. Does not depend on Mach number

D. Cannot drop and then increase again downstream

6702. Which of the following is not dimension-less ?
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A. None of these

B. Froude number

C. Pressure co-efficient

D. Kinematic viscosity

6703. The unit of dynamic viscosity in SI unit is__________________?
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A. kg/m. sec

B. m/N. sec

C. N/m2

D. m2 /sec

6704. The discharge through a V-notch weir varies as___________________?
0

A. H2/3

B. H5/2

C. H3/2

D. H1/2

6705. The pump impeller and the turbine runner in a hydraulic torque converter___________________?
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A. Are directly coupled

B. Have different diameters

C. Have the same diameter

D. None of these

6706. Unsteady uniform flow is represented by flow through a/an_________________?
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A. Long pipe at decreasing rate

B. Expanding tube at increasing rate

C. Long pipe at constant rate

D. Expanding tube at constant rate

6707. The Navier-Stokes equation deals with the law of conservation of___________________?
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A. Mass

B. Energy

C. Both A. & B.

D. Momentum

6708. Assuming flow to be laminar, if the diameter of the pipe is halved, then the pressure drop will_______________?
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A. Be quadrupled

B. Decrease

C. Increase

D. Remain same

6709. What causes convective acceleration in fluid flow ?
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A. Turbulence in flow

B. Steep slope in flow

C. Non-uniformity of flow

D. Unsteady nature of flow

6710. Vena-contracta formed during flow of a liquid through an orificemeter has__________________?
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A. More diameter compared to orifice diameter

B. None of these

C. Minimum velocity of fluid stream

D. Minimum liquid cross-section

6711. Gradually varied flow in open channel is a/an ____________ flow?
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A. Unsteady uniform

B. Steady non-uniform

C. Steady uniform

D. Unsteady non-uniform

6712. Manometers measure the ______________ pressure?
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A. Vacuum as well as the atmospheric

B. Difference in

C. Gage

D. Absolute

6713. Vena-contracta pressure tapping is at a distance _______________ from the position of an orificemeter fitted in a pipe of internal diameter d ?
0

A. 0.5 d

B. 4d

C. d

D. 2d

6714. A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation ?
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A. None of the above

B. Drag, gravitational and buoyancy forces are important

C. Drag force and gravitational forces are important

D. Inertial and drag forces are important

6715. Which of the following fluid forces are not considered in the Navier-Stokes equation ?
0

A. Turbulent forces

B. Gravity forces

C. Viscous forces

D. Pressure forces

6716. Cp/Cv is termed as__________________?
0

A. Mach number

B. Adiabatic constant

C. Prandtl number

D. Weber number

6717. If the head over the triangular notch is doubled, the discharge will increase by ______________ times?
0

A. 2

B. 2.828

C. 5.657

D. 4

6718. Velocity at a certain point in case of streamline flow is_________________?
0

A. Constant

B. Independent of time

C. Both A. & B.

D. Neither A. nor B.

6719. Fluid flow at increasing rate through a diverging pipe is an example of ______________ flow?
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A. Steady uniform

B. Non-steady uniform

C. Non-steady non-uniform

D. Steady non-uniform

6720. A differential pressure cell is used for____________________________?
0

A. Measuring small pressure difference in liquids

B. Remote recording of pressure difference

C. Measuring the difference of the impact & the static pressure

D. Measuring small pressure difference in gases

6721. Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg ?
0

A. 0.001

B. 0.01

C. 0.1

D. 1

6722. A pipe is defined as hydraulically smooth, if the friction factor_________________?
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A. For a given Reynolds number remains constant even on further smoothening of the pipe

B. Is zero irrespective of the Reynolds number

C. None of these

D. Is not a function of Reynolds number

6723. In the Newtons law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is ______________ the fluid viscosity?
0

A. Independent of

B. Inversely proportional to

C. Inversely proportional to the square root of

D. Directly proportional to

6724. Cd for the orifice plate varies from ___________________?
0

A. 0.58 to 0.8

B. 0.93 to 0.98

C. 0.2 to 0.3

D. 0.02 to 0.03

6725. 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 ?
0

A. None of these

B. Decreases as V2

C. Decreases linearly with V

D. Increases linearly with V

6726. In case of supersonic flow of a fluid through pipeline, the Mach number is__________________?
0

A. 0

B. > 1

C. < 1

D. 1

6727. Volume of liquid displaced by a floating body is equivalent to its_________________?
0

A. Submerged weight

B. Own weight

C. Own volume

D. Submerged volume

6728. The rate of change of moment of momentum represents the ______________ by the fluid?
0

A. Force exerted

B. Power developed

C. Work done

D. Torque applied

6729. If more than two branches of pipes are to be connected at the same point, then use a/an_________________?
0

A. Union

B. Elbow

C. None of these

D. Tee

6730. Steady fluid flow occurs, when the derivative of flow variables satisfy the following condition.
0

A. ?/?s = 0

B. ?/?s = constant

C. ?/?t = 0

D. ?/?t = constant

6731. The discharge co-efficient for an orifice meter does not depend upon the ___________________?
0

A. Pipe diameter

B. Pipe length

C. Type of orifice & the Reynolds number

D. Ratio of pipe diameter to orifice diameter

6732. What is the normal range of exit cone angle of a Venturimeter ?
0

A. >25

B. 7 to 15

C. 2 to 5

D. 15 to 25

6733. 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 ?
0

A. Re <> 1, accelerating flow

B. Re >>1, decelerating flow

C. Re << 1, decelerating flow

6734. An ideal nozzle design aims at________________?
0

A. Minimising wall friction

B. Suppressing boundary layer separation

C. Both A. & B.

D. Neither A. nor B.

6735. Which of the following quantities are computed by using the hydraulic radius for noncircular ducts ?
0

A. Velocity and relative roughness

B. Reynold number, relative roughness and head loss

C. Head loss and velocity

D. Reynolds number and friction factor

6736. Slugging in a fluidised bed can be avoided by using_____________________?
0

A. Shallow beds of solids and proper choice of particle size

B. Tall narrow vessel

C. Very large particles

D. Deep bed of solids

6737. Deformation drag, which is caused by widespread deformation of fluid around the immersed body____________________?
0

A. Depends mainly on cross-sectional shape

B. Is primarily a friction drag

C. Occurs when NRe is very small

D. Is independent of body length

6738. In case of a ____________ the energy of flow is considerably decreased downstream of the machine?
0

A. Centrifugal pump

B. Centrifugal fan

C. Turbine

D. Blower

6739. Dimension of surface tension is (where, F = force, L = length) ?
0

A. F-1. L

B. F.L-2

C. F-2. L

D. FL-1

6740. For the free settling of a spherical particle through a fluid, the slope of, CD-log NRe, plot is____________________?
0

A. 0.5

B. 1

C. -1

D. -0.5

6741. The ____________ is measured by a piezometric opening?
0

A. Static pressure

B. Total pressure

C. Dynamic pressure

D. Point velocity

6742. Bernoulli?s equation does not apply to the functioning of a/an__________________?
0

A. None of these

B. pitot tube

C. Venturimeter

D. Orificemeter

6743. Power loss in an orificemeter is _____________ that in a Venturimeter?
0

A. Less than

B. Data insufficient, cannot be predicted

C. More than

D. Same as

6744. Experimental study of laminar fluid flow through a circular tube was conducted by____________________?
0

A. Reynolds

B. Blake-Plummer

C. Pascal

D. Hagen and Poiseuille

6745. Volute type of casing is provided in a centrifugal pump to___________________?
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A. Convert velocity head to pressure head

B. Reduce the discharge fluctuation

C. Increase the discharge

D. Convert pressure head to velocity head

6746. Laminar flow of a Newtonian fluid ceases to exist, when the Reynolds number exceeds___________________?
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A. 2100

B. 4000

C. 3000

D. 1500

6747. Dean number is concerned with the____________________?
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A. Fluid-particle interaction

B. Psychrometry

C. Power consumption in agitated vessels

D. Fluid flow through helical pipes

6748. Priming of a centrifugal pump is done to___________________?
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A. Increase the mass flow rate of fluid

B. Avoid chances of separation inside the impeller

C. None of these

D. Develop effective pressure rise by the pump

6749. When larger particles e.g., grains are subjected to fluidisation, the corresponding bed produced is termed as the _______________ bed?
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A. Spouted

B. Sluggish

C. Boiling

D. Teeter

6750. A streamline is_________________?
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A. The line connecting the mid-points of flow cross-sections

B. Always the path of a particle

C. Defined for uniform flow only

D. Drawn normal to the velocity vector at every point

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