WorksheetsCE 8302 FLUID MECHANICS
Total questions: 45
Worksheet time: 53mins
The specific gravity of a liquid has
no unit
the same unit as that of weight density
the same unit as that of specific volume
the same unit as that of mass density
The specific volume of a liquid is the reciprocal of
weight density
specific weight
specific volume
mass density
Which one of the following is the dimension of Weight density/Specific Weight ?
M L-1T-1
M L-2 T-2
M L-3 T-2
M L-3 T-3
If there is bucket full of oil and bucket full of water and you are asked to lift them, which one of the two will require more effort given that volume of buckets remains same?
Water bucket
Oil bucket
Equal effort will be required to lift both of them
None of the mentioned
The Property of the fluid which offers resistance to the movement of one layer of fluid over another adjacent layer of the fluid is known as
Surface tension
Capillarity
Mass density
Viscosity
Which one of the following is not a unit of dynamic viscosity?
Pa-s
N-s/m2
Poise
Stokes
Which of the following is the dimension of kinematic viscosity?
[L1 T-1]
[L1 T-2]
[L2 T-1]
[L2 T-2]
Capillary rise or fall of a liquid is given by,
h=4σsinθ/wd
h=4wsinθ/σd
h=4σcosθ/wd
h=4wcosθ/σd
The value of the Bulk Modulus of elasticity for an incompressible fluid is
zero
unity
infinity
very low
Which of the following contribute to the reason behind the origin of surface tension?
only cohesive forces
only adhesive forces
neither cohesive forces nor adhesive forces
both cohesive forces and adhesive forces
The device used to measure the fluid pressure is _____________
Hygrometer
Calorimeter
Manometer
Thermometer
Which device is popularly used for measuring difference of low pressure?
Inverted U-tube Differential Manometer
U-tube Differential Manometer
Inclined Single column manometer
Vertical Single column manometer
The principle of floatation of bodies is based on the premise of
Metacentre
Newtons first law
Newtons law of viscosity
None of the mentioned
The flow in a pipe is laminar when Reynold number is
less than 2000
between 2000 and 4000
more than 4000
none of these
The type of flow in which velocity at any given time does not change with respect to space is
uniform flow
steady flow
streamline flow
non uniform flow
Continuity equation deals with the law of conservation of
Mass
Momentum
Energy
None of above
The rate of change of velocity due to change of position of fluid particles in a fluid flow is called as
normal acceleration
tangential acceleration
convective acceleration
local acceleration
The velocity components in x ,y and z directions of a velocity potential function is given by,
u=∂Φ/∂x, v=∂Φ/∂y,w=∂Φ/∂z
u=-∂Φ/∂x, v=∂Φ/∂y, w= -∂Φ/∂z
u=-∂Φ/∂x, v= -∂Φ/∂y,w= -∂Φ/∂z
u =∂Φ/∂x, v= -∂Φ/∂y,w=∂Φ/∂z
A line along which the velocity potential Φ is constant is called as
stream line
flow net
equipotential line
flow line
streamline, streakline and pathline are identical when
the flow is uniform
the flow is steady
the flow is neither steady nor uniform
the flow velocities do not change steadily with time
The device used for measuring the velocity of flow at any point in a pipe or channel is
Orifice meter
Pitot tube
Manometer
Venturimeter
Bernoulli’s theorem deals with the conservation of
Mass
Energy
Momentum
Force
The forces to be taken into account for deriving Euler’s Equations of motion are
Pressure force in the direction of flow and weight of the element
Pressure force in the direction of flow and opposite to the direction flow
Pressure force in the direction of flow and opposite to the direction flow and weight of the element.
Pressure force in the direction opposite to the direction flow
And weight of the element.
Which of the following quantities has the dimensions [M0 L0 T 0]
Density
Stress
Strain
Strain Rate
The similarity of motion between the model and prototype is ________
Dynamic similarity
Potential similarity
Kinematic similarity
Design similarity
Which Force is equal to the product of shear stress due to viscosity and surface area of the flow?
Inertial
Viscous
Pressure
Elastic
The square root of the ratio of the inertia force of a flowing fluid to the elastic force is
Froude’s Number
Euler’s number
Mach’s number
Weber’s number
A force that is caused due to attraction of particles in the layer of fluid bulk is called?
Viscous force
Inertial force
Surface tension force
Pressure force
How can we determine whether the flow is laminar or turbulent?
Reynold’s number
Mach number
Froude number
Knudsen number
Which of the following physical quantity is not a fundamental quantity?
Length
Mass
Velocity
Time
A beaker is filled with a liquid up to the mark of one liter and weighed. The weight of the liquid is found to be 6.5 N. The specific gravity of the liquid will be?
0.56
0.66
0.9
0.32
Calculate the kinematic viscosity of water in m2/sec if the dynamic viscosity is 1.226 Ns/m2?
0.00162
0.00345
0.00272
0.00122
The shear stress at a point in a liquid is found to be 0.03 N/m2. The velocity gradient at the point is 0.15 s-1. What will be its viscosity (in Poise)?
0.5 Poise
1 poise
1.5 poise
2 poise
Find the surface tension in a soap bubble of 40mm diameter when the inside pressure is 2.5 N/m2 above atmospheric pressure?
0.022 N/m
0.012 N/m
0.004 N/m
0.036 N/m
Calculate the Capillary rise in a glass tube of 2.5 mm diameter when immersed vertically in mercury. Take surface tension, σ =0.52 N/m for mercury in contact with air. The density of mercury is given as 13,600 kg/m3 and angle of contact =130°
-0.2 cm
-0.4 cm
0.5 cm
-0.5 cm
Find the Weight of the wooden block of width 2.5cm and depth 1.5m, when its floating horizontally in water. The specific weight of of wooden block is 6376.5N/m3
143225 N
146745 N
143471 N
146991 N
Find the total pressure on a rectangular plate of dimensions 2×3 m immersed in a fluid of specific gravity 0.65 at a depth of 6 m from the surface
22.9 N/cm2
43.7 N/cm2
20.3 N/cm2
41.5 N/cm2
The Areas of a pipe at section 1 and 2 are 0.007854m2 and 0.017m2. Find the discharge through the pipe if the velocity of water flowing through the pipe at section 1 is 5m/s. Find the velocity of water at section 2.
1.66 m/s
2.22 m/s
3.64 m/s
3.96 m/s
The velocity vector in a fluid flow is given by,
V=4x3i-10x2yj+2tk.Find the velocity vector of a fluid particle at (2,1,3) at t=1
32i + 40 j-2k
32i-40j-2k
32i-40j+2k
-32i+40j+2k
A stream function is given by Ψ=5x-6y, Calculate the velocity components u and v in units/sec?
4,3
5,4
6,5
7,6
Water is flowing through a pipe of 5cm diameter under a pressure of 29.43N/cm2 (gauge) with mean velocity of 2m/s. Find the pressure head and kinetic head per unit weight of water at a cross section.
30m, 0.12 m
30m, 0.20 m
20m, 0.31 m
20m ,0.40 m
Calculate the discharge through the venturimeter which is used to measure the flow of water if the area at inlet and throat are 706.85 cm2 and 176.7cm2 and difference of pressure head is 252m of water.
125652 cm3/sec
125756 cm3/sec
135674 cm3/sec
135743cm3/sec
Give the dimensions of the following,
i) power ii)kinematic viscosity
M L3 T-2 , L2 T-2
M L2 T-2 , L2 T-1
M L2 T-3 , L2 T-2
M L2 T-3 , L2 T-1
The time period(t) of a pendulum depends upon the length (L) of the pendulum and acceleration due to gravity(g). Derive the expression for Time period.
t =2π√L/2g
t =2π√L/g
t =π√L/2g
t =π√L/g
For the following equation f(V, H, D, g, σ, Φ)=0 calculate the total number of π terms as per Buckingham’s π theorem
3
4
5
6
