A piezometer provided in the pipe measures
-
friction factor -
static pressure -
dynamic pressure -
none of these
In parallel pipe problems, the
-
head loss is the same through each pipe. -
discharge is the same through all the pipes. -
total head loss is equal to the sum of the head losses through each pipe. -
none of these.
Fluid flow through a packed bed is represented by the __________ equation.
-
Fanning's -
Ergun's -
Hagen-Poiseuille's -
none of these
Which law/principle of solid mechanics is similar/equivalent to Newton's law of viscosity in fluid mechanics ?
-
Archimedes principle. -
Newton's second law of motion. -
Hooke's law. -
Newton's third law of motion.
In fluid flow, the stagnation point is defined as a point, where the __________ is zero.
-
flow velocity -
pressure -
total energy -
all (a), (b) and (c)
The velocity for subsonic flow in a pipeline
-
increases in the downstream direction. -
is constant. -
decreases in the downstream direction. -
is independent of the area of flow.
A tube is specified by its
-
thickness only -
outer diameter only -
thickness & outer diameter both -
inner diameter
Air vessel of a reciprocating pump is initially filled with
-
atmospheric air -
compressed air -
water -
none of these
Newton's law of viscosity relates the
-
shear stress and velocity. -
velocity gradient and pressure intensity. -
shear stress and rate of angular deformation in a fluid. -
pressure gradient and rate of angular deformation.
When larger particles e.g., grains are subjected to fluidisation, the corresponding bed produced is termed as the __________ bed.
-
spouted -
sluggish -
boiling -
teeter
A special type of liquid transporting device is the diffuser pump, in which __________ are minimised.
-
bearing losses -
disk friction -
shock losses -
cavitation
Permanent pressure loss in a well designed venturimeter is about __________ percent of the venturi differential.
-
1 -
10 -
30 -
50
The ratio of inertial forces to gravity forces is called the __________ number.
-
Mach -
Froude -
Euler -
Weber
Applicability of Bernoulli's equation is limited to a/an __________ fluid, that does not exchange shaft work with the surroundings.
-
incompressible -
non-viscous -
both (a) and (b) -
neither (a) nor (b)
When larger particles e.g., grains are subjected to fluidisation, the corresponding bed produced is termed as the __________ bed.
-
spouted -
sluggish -
boiling -
teeter
The centre of pressure is
-
always below the centroid of the area. -
always above the centroid of the area. -
a point on the line of action of the resultant force. -
at the centroid of the submerged area.
A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V0. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)2, what will be axial velocity in the pipe at any x ? Assume incompressible one dimensional flow i.e., no gradients in the radial direction.
Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition.
An ideal fluid is
-
non-viscous -
incompressible -
both (a) & (b) -
neither (a) & (b)
Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m)
-
N2D3 -
ND2 -
N2D -
N3D5
Prandtl mixing length is
-
applicable to laminar flow problems. -
a universal constant. -
zero at the pipe wall. -
none of these.
Equivalent length of a pipe fitting is
-
dependent on Reynolds number. -
independent of Reynolds number. -
dependent on the length of the pipe. -
none of these.
The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is
-
4(Ro-Ri) -
Ro-Ri -
2(Ro-Ri) -
Ro + Ri
The ratio of pressure forces to inertial forces is called the __________ number.
-
Froude -
Euler -
Reynold -
Mach
In case of laminar flow of fluid through a circular pipe, the
-
shear stress over the cross-section is proportional to the distance from the surface of the pipe. -
surface of velocity distribution is a paraboloid of revolution, whose volume equals half the volume of circumscribing cylinder. -
velocity profile varies hyperbolically and the shear stress remains constant over the cross-section. -
average flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius).
Water is flowing at 1 m/sec through a pipe (ofcm I.D) with a right angle bend. The force in Newtons exerted on the bend by water is
-
102π -
5π/2 -
52π -
5π/2
Buckingham-π theorem states that in any physical problem including 'n' quantities having 'm' diamensions, the quantities can be arranged into __________ independent dimensionless parameters.
-
m -
n -
n-m -
n/m
Ratio of inertial forces to surface tension forces is called the __________ number.
-
Euler -
Froude -
Mach -
Weber
Bernoulli's equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli's equation ?
A. Fluid flow is frictionless & irrotational.
B. Fluid flow is steady.
C. Fluid flow is uniform & turbulent.
D. Fluid is compressible.
E. Fluid is incompressible.
-
A, C, D -
B, D, E -
A, B, E -
A, D, E
Which of the following facilitates close control of flow of fluids ?
-
Gate valve -
Globe valve -
Butterfly valve -
Check valve
The time of oscillation of a floating body is
-
longer, if metacentric height is increased. -
independent of the metacentric height. -
dependent on the buoyant forces only. -
none of these.
Pick out the wrong statement about a streamline.
-
It is always parallel to the main direction of the fluid flow. -
It is a line across which there is no flow and it is equivalent to a rigid boundary. -
Streamlines intersect at isolated point of zero velocity and infintie velocity. -
The fluid lying between any two streamlines can be considered to be in isolation and the streamline spacing varies inversely as the velocity.
A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an __________ fluid.
-
Newtonion -
Non-Newtonion -
ideal -
incompressible
In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is
-
0.5 -
0.84 -
1.84 -
1.25
Cavitation in a centrifugal pump results from
-
high discharge pressure -
low barometric pressure -
high discharge velocity -
high discharge rate
Fanning friction factor equation applies to the __________ fluid flow.
-
non-isothermal condition of -
compressible -
both (a) and (b) -
neither (a) nor (b)
What is the value of Fanning friction factor f ' for smooth pipe at NRe = 106 approximately ?
-
0.003 -
0.01 -
0.1 -
0.3
The most serious disadvantage of an orificemeter is that
-
it is not very accurate. -
it is very costly. -
most of the pressure drop is not recoverable. -
it is not suitable for measuring gas flow.
Existence of boundary layer in fluid flow is because of the
-
surface tension -
fluid density -
fluid viscosity -
gravity forces
The ratio of inertial forces to viscous forces is called the __________ number.
-
Weber -
Mach -
Froude -
Reynold
For turbulent flow of newtonion fluid in a circular cross-section pipe, the ratio of maximum to average fluid velocity is
-
0.5 -
1 -
0.66 -
< 0.5
For an ideal fluid flow, Reynolds number is
-
2100 -
100 -
0 -
∞
Stoke's equation is valid in the Reynolds number range
-
0.01 to 0.1 -
0.1 to 2 -
2 to 10 -
10 to 100
The discharge through a rectangular weir varies as
-
H1/2 -
H5/2 -
H2/5 -
H3/2
In magnetic flow meters, voltage generation is
-
due to the motion of conducting fluid through an externally generated uniform field. -
proportional to the fluid velocity. -
both (a) and (b). -
neither (a) nor (b).
In case of supersonic flow of a fluid through pipeline, the 'Mach number' is
-
0 -
1 -
< 1 -
> 1
The pump used for irrigation purposes is generally designed for
-
large capacity & high head. -
large capacity & low head. -
small capacity & high head. -
small capacity & low head.
Which of the following is a Newtonian fluid?
-
Rubber latex -
Sewage sludge -
Quicksand -
Non-colloidal solution
In case of supersonic flow of a fluid through pipeline, the 'Mach number' is
-
0 -
1 -
< 1 -
> 1
In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes
-
less than atmospheric pressure. -
more than liquid vapor pressure. -
less than liquid vapor pressure. -
more than atmospheric pressure.