Food Engineering Questions and Answers – Unit Operations – Fluid Mechanics-1

This set of Food Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Unit Operations – Fluid Mechanics-1”.

1. Statement 1: Bernoulli’s equation can be applied to flow through pipes both, with and without friction.
Statement 2: Air is an incompressible fluid.
a) True, False
b) True, True
c) False, False
d) False, True
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2. What is Kinetic Energy Factor in the Bernoulli’s equation?
a) It is because friction varies
b) It is because friction stays constant
c) It is because the velocity in every layer varies and only the average velocity is accounted hence a correction factor is a need
d) None of the mentioned
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3. In Bernoulli’s equation, the friction correction factor is added to the LHS and the energy contributed by the pump is written on the RHS.
a) True
b) False
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4. Statement 1: Reynolds number is the ratio of viscous force to Inertial Force.
Statement 2: The thickness of Boundary layer increases with the increase in distance from the surface.
a) True, False
b) True, True
c) False, False
d) False, True
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5. The energy loss due to the friction at the walls of a pipe is called _____
a) Kinetic friction
b) Skin friction
c) Static friction
d) None of the mentioned
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6. Statement 1: Friction factor ‘f’ is an important factor in turbulent flow.
Statement 2: ‘f’ is the ratio of shear stress (ϩw) to kinetic energy head ((ρv²)⁄2g).
a) True, False
b) True, True
c) False, False
d) False, True
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7. Which of the following pumps is this pump- It has no rotating or reciprocating parts involved. No leakage. Air/gas used to impart energy.
a) Piston pump
b) Diaphragm pump
c) Gear pump
d) Air-lift pump
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8. Statement 1: Non-Newtonian fluids have a linear relationship between shear stress and shear strain.
Statement 2: Tubes are larger than pipes in diameter and have thicker walls.
a) True, False
b) True, True
c) False, False
d) False, True
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9. Pipes are described in the form of _____
a) None of the mentioned
b) Formation Number
c) All of the mentioned
d) Schedule Number
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10. Statement 1: Two pipes are joined using _____
Statement 2: The sealing material between two pipes to be joined is called _____
a) Union Joint, Coupling
b) Coupling, Gasket
c) Coupling, Thread cuttings
d) Thread cuttings, Gasket
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11. Statement 1: When an additional connection such as a valve/ tap is to be added, _____ is used.
Statement 2: Bents have more pressure drop than elbows.
a) Union joint, True
b) Union joint, False
c) T- joint, True
d) T- joint, False
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12. Which of the following is true about On-Off Control?
a) On-Off valves are called Plug Cocks
b) The size of the valve path is as big as the pipe itself
c) Pressure drop in these is the least compared to all other valves
d) All of the mentioned
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Sanfoundry Global Education & Learning Series – Food Engineering.

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