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.
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909 questions · page 11 of 46
- A. Steady uniform
- B. Non-steady uniform
- C. Non-steady non-uniform
- D. Steady non-uniform
Explanation: An increasing flow rate makes the flow unsteady, while the diverging area causes velocity to vary from one location to another, making it…
Correct answer: Non-steady non-uniform- A. The flow is rotational and incompressible
- B. The fluid is non-viscous
- C. The continuity equation is satisfied
- D. The fluid is incompressible
Explanation: Integrating Euler's equation in its usual Bernoulli form requires constant density, which is provided by the incompressibility assumption.
Correct answer: The fluid is incompressible203. In turbulent flow, a rough pipe has the same friction factor as a smooth pipe____________________?
- A. When the roughness projections are much smaller than the thickness of the laminar film
- B. In the zone of complete turbulence
- C. Everywhere in the transition zone
- D. When the friction factor is independent of the Reynold's number
Explanation: When roughness projections are submerged within the viscous sublayer, they do not significantly affect wall resistance, so the pipe…
Correct answer: When the roughness projections are much smaller than the thickness of the laminar film- A. 1
- B. 10/55
- C. 5.5
- D. 1/55
Explanation: The hydraulic power is weight flow rate multiplied by head: 10 lb/s × 55 ft = 550 ft·lb/s.
Correct answer: 1- A. More power than
- B. Less power than
- C. Same power as
- D. Data insufficient to predict
Explanation: A pitched-blade turbine generally has a lower power number than a straight-blade turbine of comparable size and speed, so it consumes less…
Correct answer: Less power than- A. (∂u/∂x) = - (∂ρ/∂t)
- B. ∂(ρu)/∂x = 0
- C. ∂u/∂x = 0
- D. ∂ρ/∂t = 0
Explanation: For incompressible flow, density is constant, so the one-dimensional continuity equation reduces to ∂u/∂x = 0.
Correct answer: ∂u/∂x = 0- A. 0.5
- B. 1
- C. 1.5
- D. 3
Explanation: In the Newton regime, drag varies as dₚ²v², while particle weight varies as dₚ³.
Correct answer: 0.5- A. Less than
- B. More than
- C. Equal to
- D. Not related to
Explanation: The discharge coefficient is the product of the velocity and contraction coefficients, Cd = CvCc.
Correct answer: More than- A. 26
- B. 42
- C. 269
- D. 325
Explanation: At the same rotameter position, gas flow is approximately inversely proportional to the square root of gas density.
Correct answer: 269- A. First power of its diameter
- B. Inverse of the fluid viscosity
- C. Inverse square of the diameter
- D. Square of the difference in specific weights of solid & fluid
Explanation: Stokes' law gives terminal velocity proportional to dₚ²(ρₚ − ρf)/μ. Therefore it varies inversely with fluid viscosity, making option b…
Correct answer: Inverse of the fluid viscosity- A. Union
- B. Tee
- C. Reducer
- D. Elbow
Explanation: A union provides a detachable connection, allowing a pipe section to be removed without cutting or rotating the whole pipeline.
Correct answer: Union- A. Centrifugal
- B. Positive acting rotary
- C. Piston
- D. A group of vacuum
Explanation: A Mono pump is a progressive-cavity pump, which is a positive-displacement rotary pump.
Correct answer: Positive acting rotary- A. Pipe length
- B. Fluid velocity in the pipe
- C. All A., B. and C.
- D. Time taken to close the valve
Explanation: Water-hammer pressure is influenced by the velocity change and valve-closing time, while pipe length affects whether closure is rapid…
Correct answer: All A., B. and C.- A. None of these
- B. At points of abrupt changes in the flow directions
- C. In laminar flow
- D. In case of boundaries experiencing form drag
Explanation: Boundary-layer separation can occur in laminar flow when an adverse pressure gradient makes the wall shear stress fall to zero and then…
Correct answer: None of these- A. 1
- B. 0.1
- C. 0.01
- D. 0.001
Explanation: Oil-sealed rotary vacuum pumps are commonly capable of reaching an absolute pressure of about 0.01 mm Hg in the range intended by this…
Correct answer: 0.01- A. Venturimeter
- B. Orificemeter
- C. None of these
- D. pitot tube
Explanation: A venturimeter, orificemeter, and pitot tube all use Bernoulli's equation to relate pressure, velocity, and elevation, with suitable loss…
Correct answer: None of these- A. Viscous forces
- B. Turbulent forces
- C. Pressure forces
- D. Compressibility forces
Explanation: The usual Reynolds force comparison accounts for inertial, pressure, and viscous effects; compressibility forces are not included in the…
Correct answer: Compressibility forces- A. U-bend
- B. 30° bend
- C. 45° bend
- D. 90° bend
Explanation: A U-bend turns the flow through approximately 180 degrees, producing a larger change in momentum and usually more fitting loss than 30…
Correct answer: U-bend- A. x/2
- B. x
- C. x/3
- D. 2x/3
Explanation: Hydraulic radius is the flow area divided by the wetted perimeter. In a very wide rectangular channel, the width dominates both…
Correct answer: x- A. Head
- B. Discharge
- C. Efficiency
- D. None of these
Explanation: A double-acting pump delivers liquid during both the forward and return strokes, whereas a single-acting pump delivers during only one…
Correct answer: Discharge