21. The continuity equation pi V,A,= p2V2A2 is based on the following assumption regarding flow of fluid______________?
A. steady flow
B. uniform flow
C. incompressible flow
D. frictionless flow
✅ The correct answer is option A.
Fluid Mechanics MCQs
22. The Prartdtl mixing length is_________________?
A. zero at the pipe wall
B. maximum at the pipe wall
C. independent of shear stress
D. none of the above
✅ The correct answer is option A.
23. Size of a venturimeter is specified by________________?
A. pipe diameter
B. throat diameter
C. angle of diverging section
D. both pipe diameter as well as throat diameter
✅ The correct answer is option A.
24. Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by________________?
A. 5%
B. 10%
C. 15%
D. 20%
✅ The correct answer is option A.
25. In case of an airfoil, the separation of flow occurs________________?
A. at the extreme rear of body
B. at the extreme front of body
C. midway between rear and front of body
D. any where between rear and front of body depending upon Reynolds number
✅ The correct answer is option A.
26. The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is________________?
A. 1/3
B. 1/4
C. 1/2
D. 2/3
✅ The correct answer is option A.
27. In a forced vortex motion, the velocity of flow is________________?
A. directly proportional to its radial distance from axis of rotation
B. inversely proportional to its radial distance from the axis of rotation
C. inversely proportional to the square of its radial distance from the axis of rotation
D. directly proportional to the square of its radial distance from the axis of rotation
✅ The correct answer is option A.
28. With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on__________________?
A. a circular disc of plate held normal to flow
B. a sphere
C. a cylinder
D. a streamlined body
✅ The correct answer is option A.
29. Which of the following is used to measure the discharge ?
A. current meter
B. venturimeter
C. pitot tube
D. hotwire anemometer
✅ The correct answer is option B.
30. The total pressure on a plane surface inclined at an angle 9 with the horizontal is equal to_______________?
A. PA
B. pA sin 9
C. pA cos 9
D. pA tan 9
✅ The correct answer is option A.