A. 4 kN/m2
B. 10 kN/m2
C. 12 kN/m2
D. 14 kN/m2
✅ The correct answer is option D.
Fluid Mechanics MCQs
If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be___________________?
A. from reservoir A to reservoirs B and C
B. from reservoir B to reservoirs C and A
C. from reservoir C to reservoirs A and B
D. unpredictable
✅ The correct answer is option C.
For laminar flow in circular pipes, the Darcy’s friction factor f is equal to_________________?
A. 16/Re
B. 32/ Re
C. 64/ Re
D. none of the above where R,, is Reynolds number
✅ The correct answer is option C.
Coefficient of velocity of venturimeter_________________?
A. is independent of Reynolds number
B. decreases with higher Reynolds number
C. is equal to the coefficient of discharge of venturimeter
D. none of the above
✅ The correct answer is option C.
The unit of kinematic viscosity is_______________?
A. gm/cm-sec2
B. dyne-sec/cm2
C. gm/cm2-sec
D. cm2/sec
✅ The correct answer is option D.
Which of the following is an incorrect statement ?
A. Coefficient of contraction of a venturimeter is unity
B. Flow nozzle is cheaper than venturimeter but has higher energy loss
C. Discharge is independent of orientation of venturimeter whether it is horizontal, vertical or inclined
D. None of the above statement is correct.
✅ The correct answer is option D.
When an ideal fluid flows past a sphere________________?
A. highest intensity of pressure occurs around the circumference at right angles to flow
B. lowest pressure intensity occurs at front stagnation point
C. lowest pressure intensity occurs at rear stagnation point
D. total drag is zero
✅ The correct answer is option D.
In which of the following the friction drag is generally larger than pressure drag?
A. a circular disc or plate held normal to flow
B. a sphere
C. a cylinder
D. an airfoil
✅ The correct answer is option D.
The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is_________________?
A. d > m > e
B. d > e > m
C. e > m > d
D. e > d > m
✅ The correct answer is option D.
An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to_______________?
A. g/3
B. g/2
C. 2g/3
D. g
✅ The correct answer is option D.