621. The Stoke’s stream function applies to the
Irrotational flow only
Ideal/non-viscous fluids only
Cases of axial symmetry
None of these
✅ The correct answer is option C.
Fluid Mechanics MCQs
622. Bernoulli’s equation accounts for the
Various momentums
Various masses
Different forms of mechanical energy
None of these
✅ The correct answer is option C.
623. For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively).
Increase
Decrease
Remain constant
Either A or B; depends on other factors
✅ The correct answer is option A.
624. A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m³/s? The Fanning friction factor, f is 0.0062.
10 m
11 m
12 m
20 m
✅ The correct answer is option B.
625. In area meter (e.g., rotameter), with increase in the fluid flow rate, the
Pressure drop increases linearly
Pressure drop is almost constant
Area through which fluid flows does not vary
None of these
✅ The correct answer is option B.
626. Choose the set of pressure intensities that are equivalent.
4.33 psi, 10 ft. of water, 8.83 inches of Hg
4.33 psi, 10 ft. of water, 20.7 inches of Hg
10 psi, 19.7 ft. of water, 23.3 inches of Hg
10 psi, 19.7 ft. of water, 5.3 inches of Hg
✅ The correct answer is option A.
627. Dimension of kinematic viscosity is
MLT⁻¹
L² . T⁻¹
L²T
L² . T⁻²
✅ The correct answer is option B.
628. Slugging occurs in a fluidised bed, if the bed is
Narrow
Deep
Both A & B
Neither A nor B
✅ The correct answer is option C.
629. Bernoulli’s equation is dependent on the
First law of thermodynamics
Third law of thermodynamics
Law of conservation of momentum
None of these
✅ The correct answer is option D.
630. What is the speed of sound (m/sec) in ordinary water?
1500
330
1000
3000
✅ The correct answer is option A.