711. Pipes having diameter 14 inches or more are designated by their
Outside diameter
Inside diameter
Schedule number
None of these
✅ The correct answer is option A.
Fluid Mechanics MCQs
712. Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f₁ and that for smooth pipe is f₂. Pick out the correct statement.
f₁ = f₂
f₁ < f₂
f₁ > f₂
Data not sufficient to relate f₁ & f₂
✅ The correct answer is option C.
713. Volute type of casing is provided in a centrifugal pump to
Convert velocity head to pressure head
Convert pressure head to velocity head
Reduce the discharge fluctuation
Increase the discharge
✅ The correct answer is option D.
714. The centre of pressure is
Always below the centroid of the area
Always above the centroid of the area
A point on the line of action of the resultant force
At the centroid of the submerged area
✅ The correct answer is option C.
715. For a given Reynolds number, in a hydraulically smooth pipe, further smoothening __________ the friction factor.
Brings about no further reduction of
Increases
Decreases
None of these
✅ The correct answer is option A.
716. Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around
2000
10
100
1000
✅ The correct answer is option D.
717. A fluid whose apparent viscosity increases with shear rate is termed as the __________ fluid.
Newtonion
Viscous
Dilatant
Non-viscous
✅ The correct answer is option C.
718. All pipes of a particular nominal size have the same
Inside diameter
Outside diameter
Thickness
None of these
✅ The correct answer is option B.
719. Mass velocity in case of steady flow and through a constant cross-section conduit is independent of the
Temperature
Pressure
Both A & B
Neither A nor B
✅ The correct answer is option C.
720. The frictional resistance in laminar flow does not depend on the
Area of surface in contact
Flow velocity
Fluid temperature
Pressure of flow
✅ The correct answer is option A.