421. For flow past a flat plate, if x is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to
√x
1/√x
X
1/x
✅ The correct answer is option A.
Fluid Mechanics MCQs
422. Which of the following equations is valid for laminar flow of a fluid through packed bed?
Fanning equation
Kozney – Karman equation
Hagen – Poiseuille equation
Blake – Plummer equation
✅ The correct answer is option B.
423. Boundary layer separation is caused by the
Reduction of pressure below vapour pressure
Reduction of pressure gradient to zero
Adverse pressure gradient
Reduction of boundary layer thickness to zero
✅ The correct answer is option C.
424. Momentum transfer in laminar flow of fluids results due to the
Viscosity
Density
Velocity gradient
None of these
✅ The correct answer is option C.
425. Propellers are
Axial flow mixers
Low speed impeller
Used for mixingliquids of high viscosity
Radial flow mixers
✅ The correct answer is option A.
426. Isotropic turbulence occurs
Where there is no velocity gradient
At higher temperatures
Only in Newtonion fluids
None of these
✅ The correct answer is option A.
427. For the same flow rate of a fluid, the pressure drop is the least for
Venturimeter
Orificemeter
Flow-nozzle
Δp is same for all
✅ The correct answer is option A.
428. Pascal law is not applicable for a/an __________ fluid.
Accelerating frictionless
Static
Uniformly moving
None of these
✅ The correct answer is option D.
429. A fluid is pumped at the rate of 10 lb/sec to a height of 55 ft. The horse power required is __________ hp.
1
Oct-55
5.5
Jan-55
✅ The correct answer is option A.
430. The co-efficient of drag and lift for an incompressible fluid depends on the
Reynolds number
Froude number
Mach number
All of the above
✅ The correct answer is option A.