Fluid Mechanics Mock Test -II

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This Test series useful for who are preparing for various technical examinations particularly TRB Mechanical, TNEB AE, TNPSC AE, SSC JE, NLC GET, ISRO Exams

Water is stored in a container to depth of 2m. Oil density 800 kg/m3 is poured over the water to a height of 1 m. The pressure prevailing at the water oil-water interface, and bottom of the tank

2 points

15.69 kPa, 27.46 kPa

7.84 kPa, 23.54 kPa

7.84 kPa, 27.46 kPa

15.69 kPa, 52.97 kPa

Clear selection

Assertion (A): Blood is a Newtonian Fluid. Reason(R): The rate of strain varies non-linearly with shear stress for blood.

1 point

A is false but R is true

Both A and R are true but R is not a correct explanation of A

A is true but R is false

Both A and R are true and R is the correct explanation of A

Clear selection

In a 2-D flow in x-y plane, if (∂u/∂y)= (∂v/∂x) then the fluid element will undergo

1 point

Translation only

Translation and rotation

Translation and deformation

Rotation and deformation

Clear selection

A glass tube with 90° bend is open at both the ends. It is inserted into a flowing stream of oil, S = 0.90, so that one opening is directed upstream and the other is directed upward. Oil inside the tube is 50 mm higher than the surface of flowing oil. The velocity measured by the tube is nearly,

1 point

0.99 m/s

1.40 m/s

1.90 m/s

0.89 m/s

Clear selection

The dimension of pressure

1 point

ML^-1T^-2

ML^2T^-1

MLT^-1

MLT^-2

Clear selection

A circular disc 3m in diameter is held normal to a 26.4 m/s wind of density 0.0012 gm/cc. What force is required to hold it at rest? Assume co-efficient of drag of disc = 1.1

2 points

246.32 N

204.34 N

3251.4N

2955.81 N

Clear selection

Match the following

2 points

A-4; B-3;C-2;D-1

A-4; B-2;C-3;D-1

A-1; B-2;C-3;D-4

A-1; B-2;C-2;D-4

Clear selection

Flow separation at a solid surface takes place due to

1 point

Positive pressure gradient along the flow direction and friction at the boundary

Decrease in pressure along the flow direction

Increase in pressure along the flow direction

Friction at the solid surface

Clear selection

Which phenomenon will occur when the valve at the discharge end of a pipe connected to a reservoir is suddenly closed?

1 point

Cavitation

Erosion

Hammering

Surging

Clear selection

Pressure reaches a value of absolute zero

1 point

At a temperature of -273K

Under vacuum condition

At the earth’s centre

When molecular momentum of system becomes zero

Clear selection

A static fluid can have

1 point

non-zero normal stress and zero shear stress

zero negative normal stress and zero shear stress

non-zero normal and shear stress

zero normal stress and non-zero shear stress

Clear selection

A 70 kg person walks on snow with a total foot implant area of 500 cm2. What pressure does he exert on snow?

1 point

12.5 kPa

137.3 kN/m2

13.73 kN/m2

0.5 kPa

Clear selection

While deriving an expression for loss of head due to a sudden expansion in a pipe, in addition to the continuity and impulse-momentum equations, one of the following assumptions is made:

1 point

the mean pressure in eddying fluid is equal to the downstream pressure

head loss due to friction is equal to the head loss is eddying motion

head loss in eddies is neglected

the mean pressure in eddying fluids is equal to the upstream pressure

Clear selection

Velocity for flow through a pipe, measured at the centre is found to be 2 m/s. Reynolds’s number is around 800. What is the average velocity in the pipe?

1 point

2 m/s

1.7 m/s

1 m/s

0.5 m/s

Clear selection

Kinematic similarity between model and prototype is the similarity of

1 point

Shape

Discharge

Stream

Forces

Clear selection

The boundary layer thickness for flow over a flat plate (a) increases with an increase in the free stream velocity (b) decreases with an increase in the free stream velocity (c) increases with an increase in the kinematic viscosity (d) decreases with an increase in the kinematic viscosity Which of the above statements is/are correct?

1 point

a and b

b and c

a, b, and c

c and d

Clear selection

If a vessel containing liquid moves downward with constant acceleration g, then

1 point

There will be vacuum in the liquid

The pressure throughout the liquid mass is atmospheric

The pressure in the liquids mass is greater than the hydrostatic pressure

The pressure throughout the liquid mass is greater than atmospheric

Clear selection

Which of the following statements is CORRECT for a fully developed pipe flow?

1 point

pressure gradient balances the wall shear stress only and has a constant value

pressure gradient is greater than the wall shear stress

the velocity profile is changing continuously

inertia force balances the wall shear stress

Clear selection

When the pressure of a liquid is increased from 2kPa to 5kPa, the corresponding decrease in volume is found to be 0.5%. the bulk modulus of Elasticity (K) of the fluid

1 point

600 kN/m2

3 x 10^6 kN/m2

1200 kN/m2

6 kN/m2

Clear selection

In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness would

1 point

Remain constant

Tend to decrease

Increase rapidly

Increase gradually

Clear selection

For a fully developed laminar flow of water (dynamic viscosity 0.001 Pa-s) through a pipe of radius 5 cm. the axial pressure gradient is -10Pa/m. The magnitude of axial velocity (in m/s) at a radial location of 0.2 cm is

2 points

-0.01m/s

0.01 m/s

-6.24 m/s

6.24 m/s

Clear selection

Hydrostatic law of pressure is given as

1 point

∂p/∂z=0

∂p/∂z=constant

∂p/∂z=ρg

∂p/∂z=z

Clear selection

The flow upstream of a shock is always

1 point

Incompressible

Supersonic

Sonic

Subsonic

Clear selection

A multi tube manometer using water and mercury is used to measure the pressure of air in a vessel, as shown in the figure below. For the given values of heights, calculate the gauge pressure in the vessel h1 = 0.4 m, h2 = 0.5 m, h3 = 0.3 m h4 = 0.7 m h5 = 0.1, h6 =0.5 m

2 points

190.31 kN/m2

210.31 kN/m2

180 kN/m2

169.73 kN/m2

Clear selection

The bulk modulus of elasticity for an ideal gas (equation of state p= ρRT, where p is the pressure, ρ is the density, R is the characteristic gas constant and T is the absolute temperature) at constant temperature T is given by

1 point

p/ρ

ρRT

Clear selection

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