Free Fluid Flow Operations MCQs with Answers
909 Fluid Flow Operations MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Last updated
909 questions · page 1 of 46
- A. 13.6 cms of Hg
- B. 13.6 metres of Hg
- C. 1 metre of H2O
- D. 34 ft ofH2O
Explanation: One atmosphere equals 760 mm Hg, which is approximately 10.3 m or 34 ft of water. Therefore, 34 ft of H2O is the matching hydrostatic head.
Correct answer: 34 ft ofH2O- A. Centipoise
- B. Poise
- C. Stoke
- D. Both B. & C.
Explanation: Dynamic viscosity of water near room temperature is approximately 1 centipoise, equal to 0.001 Pa·s.
Correct answer: Centipoise- A. kg/m.hr
- B. kg/m2.hr
- C. kg/hr
- D. kg/m2
Explanation: Mass velocity is mass flow rate per unit cross-sectional area, so its dimensions are mass/(area·time).
Correct answer: kg/m2.hr- A. cm2/second
- B. Stoke
- C. Poise
- D. None of these
Explanation: Kinematic viscosity has units of area per time, such as stoke or cm²/s.
Correct answer: Poise- A. Decreases
- B. Increases
- C. Remain constant
- D. Increases linearly
Explanation: Heating increases molecular motion and weakens the cohesive effect responsible for surface tension at the liquid surface.
Correct answer: Decreases- A. In which there is a temperature drop
- B. Which can be performed in a pipe with a constriction
- C. Which is exemplified by a non-steady flow expansion
- D. In which there is an increase in temperature
Explanation: Throttling through a valve or pipe constriction is an adiabatic steady-flow process with negligible changes in kinetic and potential…
Correct answer: Which can be performed in a pipe with a constriction- A. Bag filter
- B. Cyclone separator
- C. Dust catcher (gravity type)
- D. Hollow wet scrubber
Explanation: A gravity dust catcher relies mainly on low gas velocity and settling, so it cannot effectively remove very small particles.
Correct answer: Dust catcher (gravity type)- A. Reynold stresses
- B. Shear forces
- C. Neither A. nor B.
- D. Both A. & B.
Explanation: Turbulent valve flow generates fluctuating Reynolds stresses and strong shear forces, which produce pressure fluctuations and aerodynamic…
Correct answer: Both A. & B.9. . Operating principle of cyclone separator is based on the action of _______________ dust particles?
- A. Centrifugal force on
- B. Diffusion of
- C. Gravitational force on
- D. Electrostatic force on
Explanation: A cyclone separator spins the gas-solid mixture, forcing denser dust particles outward by centrifugal force so they fall along the wall.
Correct answer: Centrifugal force on- A. Diameter
- B. All A., B. & C.
- C. Overall height
- D. Inlet gas velocity
Explanation: Cyclone performance is affected by particle settling conditions, which depend on cyclone diameter, inlet gas velocity and geometry such as…
Correct answer: All A., B. & C.11. The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is_________________?
- A. Pipe vibrations
- B. Fluctuation in liquid flow
- C. Boundary layer separation
- D. Cavitation
Explanation: Cavitation produces bubbles that form and collapse rapidly, creating strong pressure pulses and noise in flowing liquids.
Correct answer: Cavitation- A. Wet scrubber
- B. Bag filter
- C. Dust catcher
- D. Electrostatic precipitators
Explanation: Electrostatic precipitators impart charge to fine particles and collect them on oppositely charged plates, making them effective for the…
Correct answer: Electrostatic precipitators- A. Electrostatic precipitator
- B. Gravity settling chamber
- C. Packed scrubber
- D. Hydrocyclone
Explanation: An electrostatic precipitator can remove very fine, submicronic particles by electrically charging them and collecting them on oppositely…
Correct answer: Electrostatic precipitator- A. It is a line across which there is no flow and it is equivalent to a rigid boundary
- B. It is always parallel to the main direction of the fluid flow
- C. Streamlines intersect at isolated point of zero velocity and infinite velocity
- D. The fluid lying between any two streamlines can be considered to be in isolation and the
- E. streamline spacing varies inversely as the velocity
Explanation: A streamline is tangent to the local fluid velocity, not necessarily parallel to one fixed overall or main flow direction, so statement A…
Correct answer: It is always parallel to the main direction of the fluid flow15. Select the wrong statement pertaining to flow of an incompressible fluid through a Venturimeter ?
- A. Venturimeter occupies less space than an orificemeter
- B. leaving the Venturimeter
- C. Discharge of fluid through a Venturimeter depends upon the gage difference irrespective of
- D. the orientation of Venturimeter
- E. For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that
- F. Venturimeter incurs less power loss compared to an equivalent orificemeter
Explanation: A Venturimeter has a converging section, throat, and diverging section, so it is considerably longer and bulkier than an orifice plate.
Correct answer: Venturimeter occupies less space than an orificemeter- A. The value of Mach number is always unity at the throat
- B. direction
- C. Throughout the converging portion of the tube, the density increases in the downstream
- D. No shock wave develops in the tube when the Mach number at exit is greater than unity
- E. None of these
Explanation: Mach number equals unity at the throat only when the nozzle is choked, not in every case.
Correct answer: No shock wave develops in the tube when the Mach number at exit is greater than unity- A. Platinum
- B. Copper
- C. Constantan
- D. Chromium
Explanation: A hot-wire anemometer uses a fine electrically heated wire whose cooling indicates gas velocity; platinum is preferred because it is…
Correct answer: Platinum- A. One way flow is required
- B. Fluid contains dispersed solid particles
- C. Valve is required to be either fully open or fully closed
- D. Fluid flow control is required
Explanation: A globe valve changes the flow path and provides good throttling control, so it is selected when flow regulation is needed.
Correct answer: Fluid flow control is required- A. n-m
- B. n
- C. m
- D. n/m
Explanation: Buckingham’s theorem reduces n dimensional variables involving m independent dimensions to n−m independent dimensionless groups.
Correct answer: n-m- A. √(HW/π)
- B. HW/2 (H + W)2
- C. HW/4 (H + W)2
- D. 2HW/(H + W)
Explanation: Hydraulic radius equals flow area divided by wetted perimeter. For a rectangular duct, Rₕ = HW/[2(H+W)], which is the expression intended…
Correct answer: HW/2 (H + W)2Fluid Flow Operations MCQs: common questions
Are these Fluid Flow Operations MCQs free?
Yes. All Fluid Flow Operations MCQs from Chemical Engineering are free on TestUstad, with unlimited attempts and no account needed. Nothing on this page is a sample or a trial.
How many Fluid Flow Operations MCQs are on this page?
There are 909 Fluid Flow Operations MCQs in the Chemical Engineering bank, shown 20 to a page with the correct answer and an explanation on each.
Does every Fluid Flow Operations MCQ have an explanation?
Yes. Each Fluid Flow Operations question shows the correct option and a written explanation of why it is correct, so a wrong answer teaches you something rather than just being marked wrong.
Can I take a timed Fluid Flow Operations test?
Yes. The practice button on this page starts a free Fluid Flow Operations test drawn from the Chemical Engineering bank. It marks each answer instantly, gives you a score at the end, and can be retaken as many times as you like.