# Fluid Mechanics and Hydraulics Machines (3141906) MCQ

### MCQs of Viscous and Turbulent Flow

MCQ No - 1

#### 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

D
MCQ No - 2

#### Which of the followings has the form of Reynolds number?

(A) $\frac{\Delta P}{\rho {V}^{2}}$
(B) $\frac{\rho {V}^{2}L}{\mu }$
(C) $\frac{\rho VD}{\mu }$
(D) $\frac{\rho VD}{\nu }$

C
MCQ No - 3

#### 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

D
MCQ No - 4

#### A large Reynolds number is an indication of

(A) smooth and streamline flow
(B) laminar flow
(D) turbulent flow

D
MCQ No - 5

#### 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

C