550 lbf.ft/second
550 kgf.m/second
Both A and B
550 lbf.ft./hr
✅ The correct answer is option A.
Fluid Mechanics MCQs
Boundary layer thickness in laminar flow over a flat plate increases as(where, d = distance from the leading edge.)
√d
d1/3
d2
d2/3
✅ The correct answer is option A.
Select the wrong statement pertaining to flow of an incompressible fluid through a venturimeter.
For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that leaving the venturimeter
Discharge of fluid through a venturimeter depends upon the gage difference irrespective of the orientation of venturimeter
Venturimeter occupies less space than an orificemeter
Venturimeter incurs less power loss compared to an equivalent orificemeter
✅ The correct answer is option C.
Power loss in an orificemeter is __________ that in a venturimeter.
Less than
Same as
More than
Data insufficient, cannot be predicted
✅ The correct answer is option C.
Transition from laminar flow to turbulent flow is aided by the
Surface roughness and curvature (i.e.sharp corners)
Vibration
Pressure gradient and the compressibility of the flowing medium
All of the above
✅ The correct answer is option D.
A liquid is pumped at the rate of 600 litres using 1000 rpm. If the rpm is changed to 1100, the liquid pumped is __________ litres.
600
660
1.1
60
✅ The correct answer is option B.
Pressure drop (Δp) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as
V1.8
V-0.2
V2.7
V2
✅ The correct answer is option D.
The energy equation, E + P/ρ + V²/2g +gZ (E = internal energy/mass), is applicable to
Perfect gases only
Isothermal flow of gases
Adiabatic unsteady flow of gases
All of the above
✅ The correct answer is option D.
Boundary layer separation is characterised by one of the conditions given below, where ‘Re’ is the Reynolds number for the flow. Select the appropriate conditions.
Re << 1, accelerating flow
Re >> 1, accelerating flow
Re << 1, decelerating flow
Re >>1, decelerating flow
✅ The correct answer is option D.
The ratio of pressure forces to inertial forces is called the __________ number.
Froude
Euler
Reynold
Mach
✅ The correct answer is option B.