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Mechanical Engineering
Hydraulics And Fluid Mechanics In ME
Quiz 4
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Q.1
The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by
[2(Vr - v) v]/ Vr²
[2(Vr + v) v]/ Vr²
[(Vr - v) v]/ Vr
[(Vr + v) v]/ Vr
Q.2
A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because
It is easier to see through the glass tube
Glass tube is cheaper than a metallic tube
It is not possible to conduct this experiment with any other tube
All of the above
Q.3
The angle of taper on draft tube is
Greater than 15°
Greater than 8°
Greater than 5°
Less than 8°
Q.4
The working of which of the following hydraulic units is based on Pascal's law?
Air lift pump
Jet pump
Hydraulic coupling
Hydraulic press
Q.5
When a body floating in a liquid, is displaced slightly, it oscillates about
C.G. of body
Center of pressure
Center of buoyancy
Metacentre
Q.6
A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called
Steady flow
Uniform flow
Streamline flow
Turbulent flow
Q.7
Which of the following turbine is preferred for 0 to 25 m head of water?
Pelton wheel
Kaplan turbine
Francis turbine
None of these
Q.8
The force present in a moving liquid is
Inertia force
Viscous force
Gravity force
All of these
Q.9
The flow in a pipe or channel is said to be non-uniform when
The liquid particles at all sections have the same velocities
The liquid particles at different sections have different velocities
The quantity of liquid flowing per second is constant
Each liquid particle has a definite path
Q.10
The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.
Less than
More than
Equal to
None of these
Q.11
Which of the following instrument can be used for measuring speed of an aeroplane?
Venturimeter
Orifice plate
Pitot tube
Rotameter
Q.12
Power required to drive a centrifugal pump is directly proportional to _________ of its impeller.
Diameter
Square of diameter
Cube of diameter
Fourth power of diameter
Q.13
Which of the following is an example of laminar flow?
Underground flow
Flow past tiny bodies
Flow of oil in measuring instruments
All of these
Q.14
According to Newton's law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain.
Equal to
Directly proportional
Inversely proportional
None of these
Q.15
When a liquid is flowing through a pipe, the velocity of the liquid is
Maximum at the centre and minimum near the walls
Minimum at the centre and maximum near the walls
Zero at the centre and maximum near the walls
Maximum at the centre and zero near the walls
Q.16
The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)
μπ²NR/60t
μπ²NR²/60t
μπ²NR³/60t
μπ²NR⁴/60t
Q.17
Which of the following is dimensionless?
Specific weight
Specific volume
Specific speed
Specific gravity
Q.18
The mercury does not wet the glass. This is due to the property of the liquid known as
Cohesion
Adhesion
Viscosity
Surface tension
Q.19
Newton's law of viscosity is a relationship between
Pressure, velocity and temperature
Shear stress and rate of shear strain
Shear stress and velocity
Rate of shear strain and temperature
Q.20
A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is
(bd²/12) + x̅
(d²/12 x̅) + x̅
b²/12 + x̅
d²/12 + x̅
Q.21
In impulse Turbine, energy available at the inlet is in the form of
Potential Energy
Strain Energy
Kinetic energy
None of these
Q.22
The continuity equation is connected with
Open channel/pipe flow
Compressibility of fluids
Conservation of mass
Steady/unsteady flow
Q.23
The gross or total head of the turbine is the ___________ of the water levels at the head race and tail race.
Sum
Difference
Product
None of these
Q.24
The rise of liquid along the walls of a revolving cylinder about the initial level is _________ the depression of the liquid at the axis of rotation.
Same as
Less than
More than
None of these
Q.25
A hydraulic press is a device used
To store pressure energy which may be supplied to a machine later on
To increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure
To lift larger load by the application of a comparatively much smaller force
All of the above
Q.26
The flow of water through the hole in the bottom of a wash basin is an example of
Steady flow
Uniform flow
Free vortex
Forced vortex
Q.27
Motion of a liquid in a volute casing of a centrifugal pump is an example of
Rotational flow
Radial
Forced spiral vortex flow
Spiral vortex flow
Q.28
The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately
5 mm
10 mm
20 mm
30 mm
Q.29
A large Reynold number is indication of
Smooth and streamline flow
Laminar flow
Steady flow
Highly turbulent flow
Q.30
The unit of dynamic viscosity in S.I. units is
N-m/s²
N-s/m²
Poise
Stoke
Q.31
Reynold's number is the ratio of inertia force to
Pressure force
Elastic force
Gravity force
Viscous force
Q.32
To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than
2.4 m above the hydraulic gradient
6.4 m above the hydraulic gradient
10.0 m above the hydraulic gradient
5.0 above the hydraulic gradient
Q.33
If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in
Neutral equilibrium
Stable equilibrium
Unstable equilibrium
None of these
Q.34
Froude's number is the ratio of inertia force to
Pressure force
Elastic force
Gravity force
Surface tension force
Q.35
The maximum number of jets, generally, employed in an impulse turbine without jet interference are
Two
Four
Six
Eight
Q.36
When a body is placed over a liquid, it will float if
Gravitational force is equal to the up-thrust of the liquid
Gravitational force is less than the up-thrust of the liquid
Gravitational force is more than the up-thrust of the liquid
None of the above
Q.37
The property by virtue of which a liquid opposes relative motion between its different layers is called
Surface tension
Coefficient of viscosity
Viscosity
Osmosis
Q.38
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be
2A × √H₁/Cd × a × √(2g)
2A × √H₂/Cd × a × √(2g)
2A × (√H₁ - √H₂)/Cd × a × √(2g)
2A × (√H3/2 - √H3/2)/Cd × a × √(2g)
Q.39
Surface tension has the units of
Newton-sec/m
Newton-m/sec
Newton/m
Newton
Q.40
The density of water is 1000 kg/m3 at
0° C
0° K
4° C
20° C
Q.41
The product of mass and acceleration of flowing liquid is called
Inertia force
Viscous force
Gravity force
Pressure force
Q.42
A Francis turbine is used when the available head of water is
0 to 25 m
25 m to 250 m
Above 250 m
None of these
Q.43
According to Bernoulli's equation for steady ideal fluid flow
Principle of conservation of mass holds
Velocity and pressure are inversely proportional
Total energy is constant throughout
The energy is constant along a streamline but may vary across streamlines
Q.44
Pressure intensifier increases the pressure in proportion to
Ratio of diameters
Square of ratio of diameters
Inverse ratio of diameters
Square of inverse ratio of diameters
Q.45
Specific weight of sea water is more that of pure water because it contains
Dissolved air
Dissolved salt
Suspended matter
All of the above
Q.46
In order to avoid cavitation in centrifugal pumps
The suction pressure should be high
The delivery pressure should be high
The suction pressure should be low
The delivery pressure should be low
Q.47
Uniform flow occurs when
The direction and magnitude of the velocity at all points are identical
The velocity of successive fluid particles, at any point, is the same at successive periods of time
The magnitude and direction of the velocity do not change from point to point in the fluid
The fluid particles move in plane or parallel planes and the streamline patterns are identical in each pleasure
Q.48
The buoyancy depends upon the
Weight of the liquid displaced
Pressure with which the liquid is displaced
Viscosity of the liquid
Compressibility of the liquid
Q.49
The magnitude of water hammer depends upon the
Elastic properties of the pipe material
Elastic properties of the liquid flowing through the pipe
Speed at which the valve is closed
All of the above
Q.50
Which place in hydraulic turbine is most susceptible for cavitations?
Inlet of draft rube
Blade inlet
Guide blade
Penstock
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