Fluid Mechanics MCQs Most Latest – Competitive Mechanical Engineering MCQs
This post is comprising of latest “Engineering Materials MCQs Latest – Competitive Mechanical Engineering MCQs “. Here you’ll get latest mechanical engineering mcqs for written test, interview with answers. If you want to improve your knowledge regarding mechanical engineering then read these mcqs of Design of Steel Structures.
Latest Mechanical Engineering MCQs
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Latest Engineering Materials Mcqs
The most occurred mcqs of Engineering Materials in past papers. Past papers of Engineering Materials Mcqs. Past papers of Engineering Materials Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Engineering Materials Mcqs. The Important series of Engineering Materials Mcqs are given below:
The equation of continuity holds good when the flow____________________?
A. is one dimensional
B. is steady
C. velocity is uniform at all the cross sections
D. all of the above
E. none of the above
Froude number is significant in__________________?
A. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
B. supersonics, as with projectile and jet propulsion
C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
D. all of the above
E. none of the above
A large Roynold number is indication of________________?
A. laminar flow
B. smooth and streamline flow
C. steady flow
D. turbulent flow
E. highly turbulent flow
In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than_______________?
A. viscosity
B. frictional force
C. surface friction
D. all of the above
E. none of the above
For pipes, turbulent flow occurs when Reynolds number is _____________________?
A. between 2000 and 4000
B. less than 2000
C. more than 4000
D. less than 4000
E. none of the above
Cavitation is caused by_____________________?
A. high pressure
B. high velocity
C. weak material
D. low pressure
E. low viscosity
Principle of similitude forms the basis of_________________?
A. comparing two identical equipments
B. designing models so that the result can be converted to prototypes
C. comparing similarity between design and actual equipment
D. performing acceptance tests
E. hydraulic designs
A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to_________________?
A. 10 kg
B. 1000 kg
C. 100 kg
D. 1 kg
E. 10,000 kg
Cavitation will begin when__________________?
A. the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
B. pressure becomes more than critical pressure
C. pressure is increased
D. flow is increased
E. none of the above
For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal____________________?
A. ratio of inertial force to force due to gravitation
B. ratio of inertial force to force due to viscosity
C. ratio of inertial force to force due to surface tension
D. all the four ratios of inertial force to force due to viscosity, gravitation, sur-face tension, and elasticity
Bernoulli equation deals with the law of conservation of__________________?
A. momentum
B. mass
C. energy
D. work
E. force
Two pipe systems can be said to be equivalent, when the following quantities are same__________________?
A. friction loss and flow
B. flow and length
C. length and diameter
D. friction factor and diameter
E. velocity and diameter
At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be_________________?
A. maximum
B. minimum
C. zero
D. negative value
E. could be any value
Mach number is significant in_____________________?
A. supersonics, as with projectiles and jet propulsion
B. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls
C. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
D. all of fhe above
E. none of the above
According to Bernoulli’s equation for steady ideal fluid flow____________________?
A. total energy is constant throughout
B. velocity and pressure are inversely proportional
C. principle of conservation of mass holds
D. the energy is constant along a stream-line but may vary across streamlines
E. none of the above
Hydrometer is used to determine____________________?
A. specific gravity of liquids
B. specific gravity of gases
C. specific gravity of solids
D. relative humidity
E. density
Uniform flow occurs when_____________________?
A. the velocity of successive fluid paiticles, at any point, is the same at successive periods of time
B. the direction and magnitude of the velocity at all points are identical
C. the magnitude and direction of the velocity do not change from point to point in the fluid
D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each pleasure
E. velocity, depth, pressure, etc. change from point to point in the fluid flow
The upper surface of a weir over which water flows is known is_____________________?
A. nappe
B. crest
C. sill
D. weir top
E. contracta
The region between the separation streamline and the boundary surface of the solid body is known as__________________?
A. wake
B. lift
C. drag
D. boundary layer
E. aerofoil section
In a free vortex motion, the radial component of velocity everywhere is________________?
A. minimum
B. maximum
C. zero
D. non-zero and finite
E. unpredictable
A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is _________________?
A. 0.4
B. 0.6
C. 0.83
D. 0.3
E. none of the above
Two dimensional flow occurs when________________?
A. the velocity of successive fluid particles, at any point, is the same at successive periods of time
B. the direction and magnitude of the velocity at all points are identical
C. the magnitude and direction of the velocity do not change from point to point in the fluid
D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
E. velocity, depth, pressure, etc. change from point to point in the fluid flow
The flow in which the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, is known as__________________?
A. one dimensional flow
B. steady flow
C. uniform flow
D. turbulent flow
E. streamline flow
The flow in which conditions do not change with time at any point, is known as_________________?
A. uniform flow
B. one dimensional flow
C. steady flow
D. turbulent flow
E. streamline flow
The flow which neglects changes in a transverse direction is known as_________________?
A. one dimensional flow
B. steady flow
C. uniform flow
D. turbulent flow
E. streamline flow
During the opening of a valve in a pipe line, the flow is_________________?
A. uniform
B. unsteady
C. steady
D. laminar
E. free vortex type
In the case of steady flow of a fluid, the acceleration of any fluid particle is________________?
A. variable
B. constant
C. zero
D. zero under limiting conditions
E. never zero
Rotameter is a device used to measure______________?
A. velocity of fluid
B. absolute pressure
C. flow
D. rotation
E. velocity of air
Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be_______________?
A. 1000 kg
B. 4000 kg
C. 8000 kg
D. 2000 kg
E. 16000 kg
Gradually varied flow is__________________?
A. non-steady uniform
B. non-steady non-uniform
C. steady uniform
D. steady non-uniform
E. true one-dimensional
True one-dimensional flow occurs when_________________?
A. the direction and magnitude of the veiocity at all points are identical
B. the magnitude and direction of the velocity do not change from point to point in the fluid
C. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
E. velocity, depth, pressure etc. change from point to point in the fluid flow
In an immersed body, centre of pressure is __________________?
A. above the centre of gravity
B. at the centre of gravity
C. below be centre of gravity
D. could be above or below e.g. depend¬ing on density of body and liquid
E. unpredictable
The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm”. The pressure at 2.5 m below the oil surface will be __________________?
A. 3.5 metres of water column
B. 3 metres of water column
C. 2 metres of water column
D. 4 m of water column
E. none of the above
The centre of gravity of the volume of the liquid displaced by an immersed body is called ___________________?
A. centre of pressure
B. centre of gravity
C. metacentre
D. centre of buoyancy
E. centroid
Center of pressure on an inclined plane is___________________?
A. above the centroid
B. at the centroid
C. below the centroid
D. at metacentre
E. at center of pressure
The two important forces for a floating body are__________________?
A. buoyancy, gravity
B. buoyancy, inertial
C. buoyancy, pressure
D. inertial, gravity
E. gravity, pressure
For a floating body to be in stable equilibrium, its metacentre should be___________________?
A. below the center of buoyancy
B. below the center of gravity
C. above the center of buoyancy
D. between e.g. and center of pressure
E. above the center of gravity
Fluid Mechanics Mcqs – Mechanical Engineering Mcqs
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?
A. 1 : 5
B. 1 :25
C. 1 : 2.5
D. 1:V5″
E. 1 : 53/2
A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?
A. 25 m/sec
B. 10 m/sec
C. 2 m/sec
D. 50 m/sec
E. 250 m/sec
According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to_________________?
A. more than the weight of the body
B. the weight of the body
C. less than the weight of the body
D. weight of the fluid displaced by the body
E. weight of body plus the weight of the fluid displaced by the body
For a body floating in a liquid the normal pressure exerted by the liquid acts at ____________________?
A. bottom surface of the body
B. metacentre
C. e.g. of the body
D. all points on the surface of the body
E. all of the above
The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is____________________?
A. 4.0 m
B. 3.0 m
C. 2.4 m
D. 2.5 m
E. 5.0 m
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if___________________?
A. the area is vertical
B. the area is horizontal
C. the area is inclined
D. all of the above
E. none of the above
A body floats in stable equilibrium ____________________?
A. when its e.g. is below it’s center of buoyancy
B. when the metancentre is above e.g.
C. when its meatcentric height is zero
D. metacentre has nothing to do with position of e.g. for determining stability
E. none of the above
The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub-merged body is called_______________?
A. reaction
B. upthrust
C. buoyancy
D. metacentre
E. center of pressure
Center of pressure compared to e.g. is___________________?
A. at same point
B. below it
C. above it
D. above or below depending on area of body
E. none of the above
Working principle of dead weight pressure gauge tester is based on_______________?
A. Pascal’s law
B. Newton’s law of viscosity
C. Dalton’s law of partial pressure
D. Avogadro’s hypothesis
E. Second law of thermodynamic
Which of the following manometer has highest sensitivity_________________?
A. U-tube with water
B. U-tube with mercury
C. inclined U-tube
D. micro-manometer with water
E. displacement type
Euler’s dimensionless number relates the following__________________?
A. viscous force and inertial force
B. inertial force and gravity
C. viscous force and buoyancy force
D. pressure force and inertial force
E. pressure force and viscous force
Piezometer is used to measure_____________________?
A. atmospheric pressure
B. pressure in pipe, channels etc.
C. very low pressures
D. difference of pressure between two points
E. flow
The speed of sound in a ideal gas varies directly as its__________________?
A. pressure
B. density
C. temperature
D. modulus of elasticity
E. absolute temperature
Which of the following instrument can be used for measuring speed of a submarine moving in deep sea__________________?
A. Orifice plate
B. Venturimeter
C. hot wire anemometer
D. rotameter
E. pitot tube
Mercury is often used in barometer because____________________?
A. it is the best liquid
B. its vapour pressure is so low that it may be neglected
C. the height of barometer will be less
D. both B. and C.
E. it moves easily
An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of__________________?
A. 1.2
B. 1
C. 0.8
D. 0.75
E. 1.25
Pressure of the order of 10″‘ torr can be measured by__________________?
A. Pirani Gauge
B. Bourdon tube
C. micro-manometer
D. ionisastion gauge
E. McLeod gauge
Newton’s law of viscosity is a relationship between____________________?
A. shear stress anctthejiate of angular distortion
B. shear stress, velocity and viscosity
C. shear stress and viscosity
D. pressure, velocity and viscosity
E. shear stress, pressure and rate of angular distortion
The continuity equation is connected with__________________?
A. compressibility of fluids
B. viscous/unviscous fluids
C. conservation of mass
D. steady/unsteady flow
E. open channel/pipe flow
The process of diffusion of one liquid into the other through a semi-permeable membrane is called_______________________?
A. cohesion
B. osmosis
C. surface tension
D. viscosity
E. diffusivity
The vapour pressure over the concave surface is______________________?
A. less man the vapour pressure over the plane surface
B. zero
C. greater than the vapour pressure over the plane surface
D. equal to the vapour pressure over the plane surface
E. none of the above
To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than____________________?
A. 10.0 m above the hydraulic gradient
B. 6.4 m above the hydraulic gradient
C. 2.4 m above the hydraulic gradient
D. 5.0 above the hydraulic gradient
E. none of the above
The difference of pressure between the inside and outside of a liquid drop is _______________?
A. p = T/r
B. p = Txr
C. p = T/2r
D. p = 2T/r
E. none of the above
Surface energy per unit area of a surface is numerically equal to _____________________?
A. force of adhesion
B. surface tension
C. atmospheric pressure
D. force of cohesion
E. viscosity
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the_________________?
A. force of friction
B. force of cohesion
C. force of adhesion
D. force of diffusion
E. none of die above
The buoyancy depends on___________________?
A. mass of liquid displaced
B. depth of immersion
C. pressure of the liquid displaced
D. viscosity of the liquid
E. none of the above
The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be ________________?
A. 1000 kg
B. 500 kg
C. 1500 kg
D. 2000 kg
E. 4000 kg
Falling drops of water become spheres due to the property of ____________________?
A. cohesion
B. adhesion
C. surface tension
D. viscosity
E. compressibility
Free surface of a liquid tends to contract to the smallest possible area due to force of_______________?
A. surface tension
B. friction
C. viscosity
D. cohesion
E. adhesion
Specific weight of sea water is more that of pure water because it contains_________________?
A. dissolved salt
B. dissolved air
C. suspended matter
D. all of the above
E. heavy water
Alcohol is used in manometers because___________________?
A. it is clearly visible
B. it has low vapour pressure
C. it has low surface tension
D. it can provide longer column due to low density
E. is provides suitable meniscus
The ratio of absolute viscosity to mass density is known as_________________?
A. viscosity index
B. specific viscosity
C. kinematic viscosity
D. coefficient of viscosity
E. coefficient of compressibility
The density of water is 1000 kg/m3 at__________________?
A. 0°K
B. 0°C
C. 4°C D. 20°C
E. all temperature
The property of fluid by virtue of which it offers resistance to shear is called________________?
A. surface tension
B. cohesion
C. adhesion
D. viscosity
E. all of the above
Alcohol is used in manometer, because____________________?
A. its vapour pressure is low
B. its density is less
C. it provides suitable meniscus for the inclined tube
D. it provides longer length for a given pressure difference
E. it provides accurate readings
For manometer, a better liquid combination is one having ___________________?
A. higher surface tension
B. surface tension is no criterion
C. lower surface tension
D. high density and viscosity
E. low density and viscosity
Units of surface tension are____________________?
A. distance
B. energy/unit area
C. both of the above
D. it has no units
E. none of the above
The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to_________________?
A. 2100
B. 1000
C. 2700
D. 10,000
E. 21,000
The bulk modulus of elasticity___________________?
A. is independent of pressure and viscosity
B. increases with pressure
C. is large when fluid is more compressible
D. has the dimensions of 1/pressure
E. is directly proportional to flow
Viscosity of water in comparison to mercury is_________________?
A. higher
B. same
C. lower
D. higher/lower depending on temperature
E. unpredictable
For very great pressures, viscosity of moss gases and liquids__________________?
A. increases
B. remains same
C. decreases
D. shows erratic behavior
E. none of the above
An object having 10 kg mass weighs 9.81kg on a spring balance. The value of ‘g’ at this place is _________________?
A. 10m/sec2
B. 10.2/m sec
C. 9.81 m/sec2
D. 9.75 m/sec2
E. 9 m/sec
The normal stress in a fluid will be constant in all directions at a point only if__________________________?
A. it is incompressible
B. it has zero viscosity
C. it has uniform viscosity
D. it is frictionless
E. it is at rest
When the flow parameters at any given instant remain same at every point, then flow is said to be___________________?
A. steady state
B. quasi static
C. laminar
D. uniform
E. static
The specific weight of water is 1000 kg/m”_________________?
A. at normal pressure of 760 mm
B. at mean sea level
C. at 4°C temperature
D. all the above
E. none of the above
The property of a fluid which enables it to resist tensile stress is known as___________________?
A. surface tension
B. compressibility
C. cohesion
D. adhesion
E. viscosity
Property of a fluid by which its own molecules are attracted is called___________________?
A. viscosity
B. cohesion
C. adhesion
D. compressibility
E. surface tension
Density of water is maximum at__________________?
A. 0°K
B. 0°C
C. 4°C
D. 100°C
E. 20°C.
If no resistance is encountered by displacement, such a substance is known as ___________________?
A. fluid
B. gas
C. water
D. perfect solid
E. ideal fluid
Practical fluids___________________?
A. are compressible
B. possess surface tension
C. are viscous
D. possess all the above properties
E. possess none of the above properties
Fluid is a substance that___________________?
A. always expands until it fills any container
B. cannot be subjected to shear forces
C. has the same shear stress.at a point regardless of its motion
D. cannot remain at rest under action of any shear force
E. flows
Select the correct statement?
A. Local atmospheric pressure depends upon elevation of locality only
B. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level
C. A barometer reads the difference be-tween local and standard atmospheric pressure
D. Local atmospheric pressure is always below standard atmospheric pressure
E. Gauge piessure is equal to atmospheric pressure plus instrument reading
Choose the correct relationship ?
A. gravity = specific gravity x density
B. dynamicviscosity = kinematicviscosity x density
C. specific gravity = gravity x density
D. kinematicviscosity = dynamicviscosity x density
E. hydrostaticforce = surface tension x gravity
Choose the wrong statement?
A. Viscosity of liquids decreases with in-crease in temperature
B. Viscosity is due primarily to interaction between fluid molecules
C. Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force
D. Viscosity of liquids is appreciably affected by change in pressure
E. Viscosity is expressed as poise, stoke, or saybolt seconds
Choose the wrong statement ?
A. For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy
B. The center of buoyancy is located at the center of gravity of the displaced liquid
C. If e.g. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions
D. For stability of floating cylinders or spheres, the e.g. of body must lie below the center of buoyancy
E. All floating bodies are stable
Choose the wrong statement ?
A. Buoyant force is equal to the weight of the liquid displaced
B. any weight, floating or immersed in a liquid, is acted upon by a buoyant force
C. The point through which buoyant force acts, is called the center of buoyancy
D. Center of buoyancy is located above the center of gravity of the displaced liquid v
E. Relative density of liquids can be determined by means of the depth of flotation of hydrometer
Choose the wrong statement?
A. The horizontal component acts through the center of pressure for the vertical projection
B. The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface
C. The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area
D. he vertical component passes through the center of pressure of the volume
E. Center of pressure acts at a greater depth than center of gravity