6471. Boundary layer separation occurs when the
Pressure reaches a minimum
Cross-section of the channel is reduced
Valve is closed in a pipeline
Velocity of sound is reached
✅ The correct answer is option B.
Chemical Engineering
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6472. The phenomenon occuring during pumping of a liquid solution containing dissolved gases, which may come out of the solution giving rise to gas pockets, is termed as
Evaporation
Cavitation
Sublimation
Stripping
✅ The correct answer is option B.
6473. Unsteady uniform flow is represented by flow through a/an
Long pipe at constant rate
Long pipe at decreasing rate
Expanding tube at increasing rate
Expanding tube at constant rate
✅ The correct answer is option B.
6474. Centrifugal pump can’t be used to pump
Molten sodium (used as a coolant in Fast Breeder Reactor)
Moderately viscous vegetable oil used in soap industry
Thick molten soap at 80°C
None of the above
✅ The correct answer is option C.
6475. With increase in molecular weight of the gas, the head developed by a centrifugal compressor will
Decrease
Increase
Remain same
Unpredictable
✅ The correct answer is option A.
6476. Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newton’s law of viscosity. (II) Newton’s second law of motion. (III) The continuity equation. (IV) Velocity of boundary layer must be zero relative to boundary. (V) Fluid cannot penetrate a boundary.
I, II, III
II, III, V
I, II, V
II, IV, V
✅ The correct answer is option B.
6477. A differential pressure cell is used for
Measuring small pressure difference in gases
Measuring small pressure difference in liquids
Remote recording of pressure difference
Measuring the difference of the impact & the static pressure
✅ The correct answer is option C.
6478. Which of the following exemplifies a three dimensional fluid flow ?
Fluid flow at the inlet to a nozzle
Fluid flow between parallel plates
Viscous fluid flow between converging plates
None of these
✅ The correct answer is option A.
6479. Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter ‘d’?
At the centre
At d/4 from the wall
At the wall
At d/8 from the wall
✅ The correct answer is option C.
6480. A 2″ gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is
Δp
< Δp
> Δp
Δp²
✅ The correct answer is option C.