MCQs of Viscous and Turbulent Flow (Fluid Mechanics and Hydraulic Machines - 3141906)

Fluid Mechanics and Hydraulic Machines (3141906) MCQs

MCQs of Viscous and Turbulent Flow

Showing 1 to 10 out of 22 Questions

Which of the factors primarily decide whether the flow in a circular pipe is laminar or turbulent?

(a)	The Prandtl number
(b)	The pressure gradient along the length of the pipe
(c)	The dynamic viscosity coefficient
(d)	The Reynolds number

Which of the followings has the form of Reynolds number?

(a)	$\frac{Δ P}{ρ V^{2}}$
(b)	$\frac{ρ V^{2} L}{μ}$
(c)	$\frac{ρ V D}{μ}$
(d)	$\frac{ρ V D}{ν}$

In the flow through a pipe, the transition from laminar to turbulent flow does not depend on

(a)	the velocity of the fluid
(b)	the density of the fluid
(c)	the diameter of the pipe
(d)	the length of the pipe

A large Reynolds number is an indication of

(a)	smooth and streamline flow
(b)	laminar flow
(c)	steady flow
(d)	turbulent flow

The flow through a circular pipe is laminar. Now, the fluid through the pipe is replaced with a more viscous fluid and passed through the pipe again with the same velocity. What can we say about the nature of this flow?

(a)	The flow will become turbulent
(b)	The flow will be a transition flow
(c)	The flow will remain laminar
(d)	The Reynolds number of the earlier flow is required to answer this question

How should be the viscosity of the flowing fluid for laminar flow?

(a)	The viscosity of the fluid should be as low as possible, for laminar flow
(b)	The viscosity of the fluid should be as high as possible, for laminar flow
(c)	Change in viscosity of the flowing fluid does not affect its flow
(d)	Unpredictable

How should be the viscosity of the flowing fluid for laminar flow?

(a)	The viscosity of the fluid should be as low as possible, for laminar flow
(b)	The viscosity of the fluid should be as high as possible, for laminar flow
(c)	Change in viscosity of the flowing fluid does not affect its flow
(d)	Unpredictable

When a problem states “The velocity of the water flow in a pipe is 20 m/s”, which of the following velocities is it talking about?

(a)	RMS velocity
(b)	Average velocity
(c)	Absolute velocity
(d)	Relative velocity

Which among the following is an assumption of the Hagen-Poiseuille equation?

(a)	Fluid is compressible
(b)	Fluid is uniform
(c)	Fluid is laminar
(d)	Fluid is turbulent

10.

The velocity distribution at any section of a pipe for steady laminar flow is

(a)	linear
(b)	exponential
(c)	parabolic
(d)	hyperbolic

Showing 1 to 10 out of 22 Questions