Fluid Mechanics & Hydraulics (3140611) MCQs

MCQs of Flow Through Pipes

Showing 41 to 47 out of 47 Questions
2 3 4 5
41.
The Prandtal 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
Answer:

Option (a)

42.
The losses are more in
(a) laminar
(b) turbulent
(c) transition
(d) critical
Answer:

Option (b)

43.
The wake
(a) always occurs before a separation point
(b) always occurs after a separation point
(c) is a region of high-pressure intensity
(d) none of the above
Answer:

Option (b)

44.
The Prandtl Number approximates ___________
(a) momentum diffusivity to thermal diffusivity
(b) thermal diffusivity to momentum diffusivity
(c) shear stress to thermal diffusivity
(d) thermal diffusivity to kinematic viscosity
Answer:

Option (a)

45.
What is the formula for determining the size of equivalent pipe for two pipes of lengths L1, L2  and diameters d1, d2  respectively? Where, L = L1 + L2
(a) Ld=L1d1+L2d2
(b) Ld2=L1d12+L2d22
(c) Ld3=L1d13+L2d23
(d) Ld5=L1d15+L2d25
Answer:

Option (d)

46.
What is the Darcy-Weisbach formula for heat loss due to friction? Where, f = Darcy's coefficient of friction
(a) hf=flv2gd
(b) hf=flv22gd
(c) hf=4flv22gd
(d) hf=16flv22gd
Answer:

Option (c)

47.
What is the correct formula for loss at the exit of a pipe?
(a) hL=0.5 v22g
(b) hL= v22g
(c) hL= 2v2g
(d) hL= 4v2g
Answer:

Option (b)

Showing 41 to 47 out of 47 Questions
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