MCQs of Flow Through Pipes (Fluid Mechanics & Hydraulics - 3140611)

Fluid Mechanics & Hydraulics (3140611) MCQs

MCQs of Flow Through Pipes

Showing 21 to 30 out of 47 Questions

21.

Minor losses occur due to

(a)	sudden enlargement in the pipe
(b)	sudden contraction in the pipe
(c)	bends in pipe
(d)	all of the above

22.

What is the effect of change in Reynold's number on friction factor in turbulent flow?

(a)	As Reynold's number increases the friction factor increases in turbulent flow
(b)	As Reynold's number increases the friction factor decreases in turbulent flow
(c)	Change in Reynold's number does not affect the friction factor in turbulent flow
(d)	Unpredictable

23.

The friction factor in fluid flowing through pipe depends upon

(a)	Reynold's number
(b)	relative roughness of pipe surface
(c)	both a. and b.
(d)	none of the above

24.

The head loss through fluid flowing pipe due to friction is

(a)	the minor loss
(b)	the major loss
(c)	both a. and b.
(d)	none of the above

25.

The hammer blow in pipes occurs when

(a)	there is excessive leakage in the pipe
(b)	the pipe bursts under high pressure of the fluid
(c)	the flow of fluid through the pipe is suddenly brought to rest by the closing of the valve
(d)	the flow of fluid through the pipe is gradually brought to rest by the closing of the valve

26.

For a fully-developed pipe flow, how does the pressure vary with the length of the pipe?

(a)	Linearly
(b)	Parabolic
(c)	Exponential
(d)	Constant

27.

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

28.

Which of the factors primarily decides 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

29.

How is Reynolds number defined as?

(a)	The ratio of pressures in the inlet to the outlet of a pipe
(b)	The product of velocity of the flow and the diameter of the pipe, divided by the kinematic viscosity of fluid
(c)	The product of the density of the fluid, the velocity of the flow and the diameter of the pipe, divided by the dynamic viscosity of the fluid
(d)	The ratio of inertia force to viscous force

30.

Water flows through a circular tube with a velocity of 2 m/s. The diameter of the pipe is 14 cm. Take kinematic viscosity of water 10-6 m2/s and density of water 1000 kg/m3. The Reynold number is

(a)	$2.8 \times 10^{8}$
(b)	$2.8 \times 10^{5}$
(c)	2800
(d)	28000

Showing 21 to 30 out of 47 Questions