A. 0.423 D
B. 0.577 D
C. 0.223 D
D. 0.707 D
✅ The correct answer is option B.
Fluid Mechanics MCQs
12. The theoretical value of coefficient of contraction of a sharp edged orifice is_______________?
A. 0.611
B. 0.85
C. 0.98
D. 1.00
✅ The correct answer is option A.
13. The discharge of a liquid of kinematic viscosity 4 cm2/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is__________________?
A. laminar flow
B. transition flow
C. turbulent flow
D. not predictable from the given data
✅ The correct answer is option A.
14. The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is_______________?
A. 1/3 R
B. 1/2 R
C. 2/3 R
D. 3/4R
✅ The correct answer is option A.
15. Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is__________________?
A. slightly less
B. slightly more
C. nearly half
D. equal
✅ The correct answer is option A.
16. Stanton diagram is a______________?
A. log-log plot of friction factor against Reynolds number
B. log-log plot of relative roughness against Reynolds number
C. semi-log plot of friction factor against Reynolds number
D. semi-log plot of friction factor against relative roughness
✅ The correct answer is option A.
17. Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is________________?
A. less than d
B. between d and 1.5 d
C. between 1.5 d and 2d
D. greater than 2d
✅ The correct answer is option A.
18. Equation of continuity is based on the principle of conservation of_________________?
A. mass
B. energy
C. momentum
D. none of the above
✅ The correct answer is option A.
19. Two pipe systems are said to be equivalent when_________________?
A. head loss and discharge are same in two systems
B. length of pipe and discharge are same in two systems
C. friction factor and length are same in two systems
D. length and diameter are same in two systems
✅ The correct answer is option A.
20. The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is________________?
A. 0.223 R
B. 0.423 R
C. 0.577 R
D. 0.707 R
✅ The correct answer is option A.