Competitive Mechanical Engineering MCQs – Fluid Mechanics MCQs Latest
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
By practicing these MCQs of Mechanical Engineering MCQs – Engineering Materials Mcqs, an individual for exams performs better than before. This post comprising of mechanical engineering objective questions and answers related to “Engineering Materials Mcqs“. As wise people believe “Perfect Practice make a Man Perfect”. It is therefore practice these mcqs of mechanical engineering to approach the success. Tab this page to check “Latest Engineering Materials Mcqs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others.
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:
Hot wire anemometer is used to measure_______________?
A. pressure intensity of gas
B. velocity of gas
C. discharge
D. pressure intensity of liquid
Which of the following is the unit of kinematic viscosity _________________?
A. poise
B. pascal
C. stoke
D. faraday
E. none of the above
Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called________________?
A. adhesion
B. viscosity
C. cohesion
D. compressibility
E. surface tension
Poise is the unit of________________?
A. capillarity
B. surface tension
C. viscosity
D. shear stress in fluids
E. buoyancy
Barometer is used to measure__________________?
A. very low pressure
B. atmospheric pressure
C. pressure in pipes, channels etc.
D. difference of pressure between two points
E. rain level
Center of buoyancy is the___________________?
A. centroid of the displaced volume of fluid
B. e.g. of floating ‘body
C. center of pressure of displaced volume
D. does not exist
E. none of the above
Metacentre is the point of intersection of _________________________?
A. mid point between e.g. and center of buoyancy
B. buoyant force and the center line of body
C. vertical upward force through e.g. of body and center line of body
D. all of the above
E. none of the above
Buoyant force is___________________?
A. equal to the volume of liquid displaced
B. resultant force acting on a floating body
C. force necessary to keep a body in equilibrium
D. the resultant force on a body due to the fluid surrounding it
E. none of the above
A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?
A. 4 minutes
B. 900 minutes
C. 4 x (225)3/2 minutes
D. 4 (225)1/3 minutes
E. 4 x V225 minutes
Normal depth in open channel flow is the depth of flow corresponding to_______________?
A. unsteady flow
B. steady flow
C. laminar flow
D. uniform flow
E. critical flow
For hypersonic flow, the Mach number is___________________?
A. greater than unity
B. unity
C. greater than 2
D. greater than 4
E. greater than 10
All the terms of energy in Bernoulli’s equation have dimension of_______________?
A. energy
B. mass
C. work
D. length
E. time
The fluid forces considered in the Navier Stokes equation are__________________?
A. gravity, pressure and viscous
B. pressure, viscous and turbulent
C. gravity, pressure and turbulent
D. gravity, viscous and turbulent
E. none of the above
For pipes, laminar flow occurs when Roynolds number is__________________?
A. less than 2000
B. more than 4000
C. between 2000 and 4000
D. less than 4000
E. none of the above
In a forced vortex, the velocity of flow everywhere within the fluid is__________________?
A. minimum
B. maximum
C. zero
D. non-zero finite
E. unpredictable
In a static fluid ___________________?
A. fluid pressure is zero
B. resistance to shear stress is small
C. linear deformation is small
D. only normal stresses can exist
E. viscosity is nil
An ideal flow of any fluid must fulfill the following____________________?
A. Newton’s law of viscosity
B. Newton’s law of motion
C. Pascal’ law
D. Continuity equation
E. Boundary layer theory
Liquids_________________?
A. occupy definite volume
B. cannot be compressed
C. are not affected by change in pressure and temperature
D. are not viscous
E. none of the above
The value of mass density in kgsecVm4 for water at 0°C is_________________?
A. 1000
B. 1
C. 100
D. 101.9
E. 91
Mercury does not wet glass. This is due to property of liquid known as__________________?
A. cohesion
B. adhesion
C. surface tension
D. viscosity
E. compressibility
Specific weight of water in S.I. units is equal to ________________?
A. 10000 N/m3
B. 1000 N/m3
C. 9.81 xlO3 N/m3
D. 9.81 xlO6N/m3
E. 9.81 N/m3
The tendency of a liquid surface to contract is due to the following property_____________?
A. adhesion
B. cohesion
C. viscosity
D. surface tension
E. elasticity
A perfect gas____________________?
A. has zero viscosity
B. has constant viscosity
C. is in compressible
D. is of theoretical interest
E. none of the above
A fluid in equilibrium can’t sustain____________________?
A. compressive stress
B. tensile stress
C. shear stress
D. bending stress
E. all of the above
The bulk modulus of elasticity with increase in pressure__________________?
A. increases
B. remains constant
C. decreases
D. increases first up to certain limit and then decreases
E. unpredictable
A balloon lifting in air follows the following principle_____________________?
A. law of gravitation
B. principle of buoyancy
C. Archimedes principle
D. all of the above
E. continuity equation
Surface tension__________________?
A. acts in the plane of the interface normal to any line in the surface
B. decreases with fall in temperature
C. is a function of the curvature of the interface
D. is also known as capillarity
E. has no units
A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm2 and a volume of 0.039 m3 at 150 kg/cm2. The bulk modulus of elasticity of liquid is___________________?
A. 40 x 105 kg/cm2
B. 4000 kg/cm2
C. 400 kg/cm2
D. 40 x 106 kg/cm2
E. none of the above
Which of the following meters is not associated with viscosity____________________?
A. Say bolt
B. Red wood
C. Engler
D. Orsat
E. none of the above
Dimensions of surface tension are___________________?
A. MlL°T2
B. MlL r2
C. MlL°Tx
D. MlL2T2
E. MlL°t
If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water________________?
A. 51 cm
B. 52 cm
C. 50 cm
D. 52.2 cm
E. 51.7 cm
Increase in pressure at the outer edge of a drum of radius R due to rotation at corad/sec, full of liquid of density p will be___________________?
A. 2pa2R2
B. pco2/?2/2
C. pco2/?2
D. pa2R/2
E. none of the above
Kinematic viscosity is dependent upon__________________?
A. distance
B. pressure
C. level
D. flow
E. density
If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be________________?
A. w/h
B. wh
C. h
D. h/w
E. h/wh
The units of kinematic viscosity are____________________?
A. metres2 per sec
B. newton-sec per metre
C. kg sec/metre
D. newton-sec per metre
E. none of the above
Kinematic viscosity is equal to_________________?
A. dynamic viscosity/density
B. density/dynamic viscosity
C. dynamicviscosity x density
D. 1/dynamicviscosity x density
E. same as dynamic viscosity
A one dimensional flow is one which_________________?
A. is steady uniform flow
B. is uniform flow
C. takes place in straight lines
D. involves zero transverse component of flow
E. takes place in one dimension
A pressure of 25 m of head of water is equal to_________________?
A. 2500 kN/m2
B. 245 kN/m2
C. 25 kN/m2
D. 2.5kN/m2
E. 12.5 kN/m2
If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its__________________?
A. specific mass
B. specific weight
C. specific gravity
D. specific density
E. none of the above
A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will_________________?
A. decrease
B. increase
C. remain same
D. increase/decrease depending on depth of immersion
E. unpredictable
A liquid would wet the solid, if adhesion forces as compared to cohesion forces are________________?
A. equal
B. more
C. less
D. less at low temperature and more at high temperature
E. there is no such criterion
The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as_________________?
A. center of buoyancy
B. center of pressure
C. meta center
D. center of gravity
E. none of the above
The conditions for the stable equilibrium of a floating body are___________________?
A. the meta-center should lie above the center of gravity
B. a righting couple should be formed
C. the center of buoyancy and the center of gravity must lie on the same vertical line
D. all the above are correct
E. none of the above is correct
The angle of contact in case of a liquid depends upon___________________?
A. the material which exists above the free surface of the liquid
B. the nature of the liquid and the solid
C. both of die above
D. any one of the above
E. none of die above
Rain drops are spherical because of__________________?
A. air resistance
B. viscosity
C. surface tension forces
D. atmospheric pressure
E. none of the above
The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately____________________?
A. 5 mm
B. 1 mm
C. 10 mm
D. 20 mm
E. 30 mm
If the surface of liquid is convex, men ___________________?
A. cohesion pressure is decreased
B. cohesion pressure is negligible
C. cohesion pressure is increased
D. there is no cohesion pressure
E. none of the above
To avoid an interruption in the flow of a syphon, an air vessel is provided__________________?
A. at the outlet
B. at the inlet
C. at the summit
D. ay nay point between inlet and outlet
E. none of the above
The property by virtue of which a liquid opposes relative motion between its different layers is called_________________?
A. co-efficient of viscosity
B. surface tension
C. viscosity
D. osmosis
E. cohesion
The units of dynamic or absolute viscosity are__________________?
A. kg sec/meter
B. metres2 per sec
C. newton-sec per meter
D. newton-sec2 per meter
E. none of the above
The rise or depression of liquid in a tube due to surface tensionwim increase in size of tube will________________?
A. remain unaffected
B. increase
C. may increase or decrease depending on the characteristics of liquid
D. decrease
E. unpredictable
Capillary action is due to the_________________?
A. cohesion of the liquid
B. surface tension
C. adhesion of the liquid molecules and the molecules on the surface of a solid
D. all of the above
E. none of the above
The atmospheric pressure with rise in altitude decreases__________________?
A. unpredictable
B. first slowly and then steeply
C. first steeply and then gradually
D. linearly
E. none of the above
Operation of McLeod gauge used for low pressure measurement is based on the principle of_________________?
A. Charle’s law
B. Boyle’s law
C. gas law
D. Pascal’s law
E. McLeod’s law
In an isothermal atmosphere, the pressure___________________?
A. remains constant
B. decreases linearly with elevation
C. varies in the same way as the density
D. increases exponentially with elevation
E. unpredictable
Which of the following instrument can be used for measuring speed of an aeroplane___________________?
A. Orifice plate
B. Venturimeter
C. hot wire anemometer
D. rotameter
E. pitot tube
Dynamic viscosity of most of the liquids with rise in temperature__________________?
A. remains unaffected
B. decreases
A. increases
D. unpredictable
E. none of the above
A metal with specific gravity of o floating in a fluid of same specific gravity a will____________________?
A. float over fluid
B. sink to bottom
C. partly immersed
D. be fully immersed with top surface at fluid surface
E. none of the above
Manometer is used to measure__________________?
A. pressure in pipes, channels etc
B. very low pressure
C. atmospheric pressure
D. difference of pressure between two points
E. velocity
In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle 9. Sensitivity of inclined tube to sensitivity of U-tube is equal to________________?
A. cas 9
B. sin 9
C. sin 9
D. cos 9
E. tan 9
The resultant of all normal pressures acts___________________?
A. at center of pressure
B. at e.g. of body
C. vertically upwards
D. at metacentre
E. vertically downwards
Metacentric height is the distance between the metacentre and_______________?
A. center of pressure
B. water surface
C. center of gravity
D. center of buoyancy
E. none of the above
The center of pressure of a surface subjected to fluid pressure is the point_______________?
A. on the surface at which resultant pres-sure acts
B. at which all hydraulic forces meet
C. on the surface at which gravitational force acts
D. similar to metacentre
E. where pressure equivalent to hydraulic thrust will act
A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is_________________?
A. 5
B. 1
C. 7
D. 6
A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is____________________?
A. 18,000 kg
B. 13,500 kg
C. 9,000 kg
D. 27,000 kg
E. 30,000 kg
If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm”, the pressure at a depth of 50 m below the oil surface will be_________________?
A. 3 meters of water column
B. 2 meters of water column
C. 5 meters of water column
D. 6 meters of water Column
E. 7 meters of water column
When a body floating in a liquid, is displaced slightly, it oscillates about _________________?
A. e.g. of body
B. center of buoyancy
C. center of pressure
D. metacentre
E. liquid surface
Ratio of inertia force to surface Jension is known as ___________________?
A. Froude number
B. Mach number
C. Reynold’s number
D. Weber’s number
E. none of the above
Ratio of inertia force to elastic force is known as__________________?
A. Mach number
B. Reynold’s number
C. Froude number
D. Weber’s number
E. none of the above
For a floating body to be in equilibrium_____________________?
A. a righting couple should be formed
B. centre of buoyancy and e.g. must lie on same vertical plane
C. meta centre should be above e.g.
D. all of the above
E. none of the above
An open vessel of water is accelerated up an inclined plane. The free water surface will__________________?
A. make an angle in direction of inclination of inclined plane
B. be horizontal
C. make an angle in opposite direction to inclination of inclined plane
D. any one of above is possible
E. none of the above
Resultant pressure of the liquid in the case of an immersed body acts through____________________?
A. metacentre
B. centre of pressure
C. centre of gravity
D. centre of buoyancy
E. in between e.g. and centre of pressure
Differential monometer is used to measure___________________?
A. atmospheric pressure
B. pressure in pipes, channels etc.
C. very low pressure
D. difference of pressure between two points
E. velocity in pipes
The time oscillation of a floating body with increase in metacentric height will be_________________?
A. higher
B. same
C. lower
D. lower/higher depending on weight of body
E. unpredictable
The normal stress is same in all directions at a point in a fluid_______________?
A. only when the fluid is incompressible and has zero viscosity
B. only when the fluid is frictionless
C. when there is no motion of one fluid layer relative to an adjacent layer
D. irrespective of the motion of one fluid layer relative to an adjacent layer
E. in case of an ideal fluid
For measuring flow by a venturimeter, if should be installed in __________________?
A. horizontal line
B. vertical line
C. inclined line with flow downward
D. inclined line with upward flow
E. in any direction and in any location
Flow of water in a pipe about 3 metres in diameter can be measured by__________________?
A. venturi
B. orifice plate
C. rotameter
D. pitot tube
E. nozzle
An ideal flow of any fluid must satisfy __________________?
A. Newton’s law of viscosity
B. Pascal law
C. boundary layer theory
D. continuity equation
E. Bernoulli’s theorem
Non uniform flow occurs when_________________?
A. the direction and magnitude of the velocity at all points are identical
B. the magnitude aricf direction of the velocity do not change from point to point in the fluid
C. the velocity of successive fluid particles, at any point, is the same at successive 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
Uniform flow occurs when ___________________?
A. the flow is streamline
B. the flow is steady
C. size and shape of the cross section in a particular length remain constant
D. size and cross section change uniformly along length
E. flow occurs at constant fate
Steady flow occurs when___________________?
A. the direction and magnitude of the velocity at all points are identical
B. the velocity of successive fluid particles, at any point, is the same at successive periods of time
C. velocity, depth, pressure, etc. change from point to point in the fluid flow
D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
E. the magnitude and direction of the velocity do not change from point to point in the fluid
The flow in which each liquid particle has a definite path and their paths do not cross each other is called__________________?
A. uniform flow
B. one dimensional flow
C. steady flow
D. turbulent flow
E. streamline flow
The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as________________?
A. steady flow
B. uniform flow
C. one dimensional flow
D. turbulent flow
E. streamline flow
Flow occurring in a pipeline when a valve is being opened is________________?
A. vortex
B. unsteady
C. laminar
D. steady
E. rotational
A streamline is defined as the line________________?
A. parallel to outer surface of pipe
B. parallel to central axis flow
C. of equal yelocity in a flow
D. along which the pressure drop is uniform
E. which occurs in all flows
A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?
A. 0.4
B. 0.5
C. 0.515
D. 0.5
E. none of the above
The velocity of jet of water travelling out of opening in a tank filled with water is proportional to_________________?
A. head of water (h)
B. h1
C. V/T
D. h2
E. h3/1
Pitot tube is used for measurement of_________________?
A. flow
B. pressure
C. velocity
D. dsscharge
E. viscosity
The total energy of each particle at various places in the case of perfect incompres sible fluid flowing in continuous sream__________________?
D. keeps on decreasing
B. keeps on increasing
C. remains constant
D. may increase/decrease
E. unpredictable