Hydraulics Objective Questions PDF

Fluid is a substance that A. cannot be subjected to shear forces B. always expands until it fills any container C. has the same shear stress at a point regardless of its motion D. cannot remain at rest under action of any shear force Fluid is a substance that A. can...

Fluid is a substance that A. cannot be subjected to shear forces B. always expands until it fills any container C. has the same shear stress at a point regardless of its motion D. cannot remain at rest under action of any shear force Fluid is a substance that A. cannot be subjected to shear forces B. always expands until it fills any container C. has the same shear stress at a point regardless of its motion D. cannot remain at rest under action of any shear force Density of water is maximum at A. 0°C B. 4°C C. 100°C D. 20°C Density of water is maximum at A. 0°C B. 4°C C. 100°C D. 20°C Property of a fluid by which its own molecules are attracted is called A. adhesion B. cohesion C. viscosity D. surface tension Property of a fluid by which its own molecules are attracted is called A. adhesion B. cohesion C. viscosity D. surface tension Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called A. adhesion B. cohesion C. viscosity D. surface tension Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called A. adhesion B. cohesion C. viscosity D. surface tension 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 is frictionless D. it is at rest 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 is frictionless D. it is at rest Specific weight of sea water is more that of pure water because it contains A. dissolved air B. dissolved salt C. suspended matter D. all of the above Specific weight of sea water is more that of pure water because it contains A. dissolved air B. dissolved salt C. suspended matter D. all of the above Free surface of a liquid tends to contract to the smallest possible area due to force of A. surface tension B. viscosity C. friction D. cohesion Free surface of a liquid tends to contract to the smallest possible area due to force of A. surface tension B. viscosity C. friction D. cohesion A liquid would wet the solid, if adhesion forces as compared to cohesion forces are A. less B. more C. equal D. less at low temperature and more at high temperature A liquid would wet the solid, if adhesion forces as compared to cohesion forces are A. less B. more C. equal D. less at low temperature and more at high temperature Barometer is used to measure A. pressure in pipes, channels etc B. atmospheric pressure C. very low pressure D. difference of pressure between two points Barometer is used to measure A. pressure in pipes, channels etc B. atmospheric pressure C. very low pressure D. difference of pressure between two points Manometer is used to measure A. pressure in pipes, channels etc B. atmospheric pressure C. very low pressure D. velocity in pipes Manometer is used to measure A. pressure in pipes, channels etc B. atmospheric pressure C. very low pressure D. velocity in pipes If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be A. higher than the surface of liquid B. the same as the surface of liquid C. lower than the surface of liquid D. unpredictable If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be A. higher than the surface of liquid B. the same as the surface of liquid C. lower than the surface of liquid D. unpredictable When a fluid is subjected to resistance, it undergoes a volumetric change due to A. Cohesion B. Strain C. Compressibility D. Adhesion When a fluid is subjected to resistance, it undergoes a volumetric change due to A. Cohesion B. Strain C. Compressibility D. Adhesion Liquids transmit pressure equally in all the directions. This is according to A. Boyle’s law B. Archimedes principle C. Pascal’s law D. Newton’s formula Liquids transmit pressure equally in all the directions. This is according to A. Boyle’s law B. Archimedes principle C. Pascal’s law D. Newton’s formula The rise or depression of liquid in a tube due to surface tension with an increase in size of tube will A. increase B. remain unaffected C. may increase or decrease depending on the characteristics of liquid D. decrease The rise or depression of liquid in a tube due to surface tension with an increase in size of tube will A. increase B. remain unaffected C. may increase or decrease depending on the characteristics of liquid D. decrease Mercury is often used in barometer because A. it is the best liquid B. the height of barometer will be less C. its vapor pressure is so low that it may be neglected D. both (b) and (c) Mercury is often used in barometer because A. it is the best liquid B. the height of barometer will be less C. its vapor pressure is so low that it may be neglected D. both (b) and (c) The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as A. metacenter B. center of pressure C. center of buoyancy D. center of gravity The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as A. metacenter B. center of pressure C. center of buoyancy D. center of gravity Which of the following is the correct relation between centroid (cg) and the center of pressure (cp) of a plane submerged in a liquid? A. cg is always below cp B. cp is always below cg C. cg is either at cp or below it D. cp is either at cg or below it Which of the following is the correct relation between centroid (cg) and the center of pressure (cp) of a plane submerged in a liquid? A. cg is always below cp B. cp is always below cg C. cg is either at cp or below it D. cp is either at cg or below it The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centroid, if A. the area is horizontal B. the area is vertical C. the area is inclined D. all of the above The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centroid, if A. the area is horizontal B. the area is vertical C. the area is inclined D. all of the above Choose the wrong statement A. The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface B. The horizontal component acts through the center of pressure for the vertical projection 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. The vertical component passes through the center of pressure of the volume Choose the wrong statement A. The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface B. The horizontal component acts through the center of pressure for the vertical projection 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. The vertical component passes through the center of pressure of the volume Center of pressure on an inclined plane is A. at the centroid B. above the centroid C. below the centroid D. at metacenter Center of pressure on an inclined plane is A. at the centroid B. above the centroid C. below the centroid D. at metacenter Can center of pressure for a vertical plane submerged surface be ever be above center of gravity? A. Yes B. No C. It can be above in cases where the surface height is very large D. None of the mentioned Can center of pressure for a vertical plane submerged surface be ever be above center of gravity? A. Yes B. No C. It can be above in cases where the surface height is very large D. None of the mentioned In a vertically submerged plane surface, pressure at every point remains same. A. True B. False In a vertically submerged plane surface, pressure at every point remains same. A. True B. False For an inclined plate the pressure intensity at every point differs. A. True B. False For an inclined plate the pressure intensity at every point differs. A. True B. False The magnitude of total pressure and center of pressure is independent on the shape of the submerged plane surface. A. True B. False The magnitude of total pressure and center of pressure is independent on the shape of the submerged plane surface. A. True B. False What is the variation of total pressure with depth for any submerged surface if we neglect variation in the density? A. Linear B. Parabolic C. Curvilinear D. Logarithmic What is the variation of total pressure with depth for any submerged surface if we neglect variation in the density? A. Linear B. Parabolic C. Curvilinear D. Logarithmic The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to A. Equilibrium of a floating body B. Archimedes’ principle C. Bernoulli’s theorem D. Metacentric principle The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to A. Equilibrium of a floating body B. Archimedes’ principle C. Bernoulli’s theorem D. Metacentric principle The resultant upward pressure of the fluid on an immersed body is called A. upthrust B. buoyant force C. center of pressure D. all the above The resultant upward pressure of the fluid on an immersed body is called A. upthrust B. buoyant force C. center of pressure D. all the above What is the principal cause of action of buoyant force on a body submerged partially or fully in fluid? A. Displacement of fluid due to submerged body B. Development of force due to dynamic action C. Internal shear forces mitigating external forces D. None of the mentioned What is the principal cause of action of buoyant force on a body submerged partially or fully in fluid? A. Displacement of fluid due to submerged body B. Development of force due to dynamic action C. Internal shear forces mitigating external forces D. None of the mentioned The center of gravity of the volume of the liquid displaced by an immersed body is called A. metacenter B. center of pressure C. center of buoyancy D. center of gravity The center of gravity of the volume of the liquid displaced by an immersed body is called A. metacenter B. center of pressure C. center of buoyancy D. center of gravity The horizontal component of buoyant force is A. negligible B. same as buoyant force C. zero D. none of the above The horizontal component of buoyant force is A. negligible B. same as buoyant force C. zero D. none of the above The line of action of the buoyant force acts through the A. centroid of the volume of fluid vertically above the body B. center of the volume of floating body C. center of gravity of any submerged body D. centroid of the displaced volume of fluid The line of action of the buoyant force acts through the A. centroid of the volume of fluid vertically above the body B. center of the volume of floating body C. center of gravity of any submerged body D. centroid of the displaced volume of fluid Choose the wrong statement A. any weight, floating or immersed in a liquid, is acted upon by a buoyant force B. Buoyant force is equal to the weight of the liquid displaced 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 Choose the wrong statement A. any weight, floating or immersed in a liquid, is acted upon by a buoyant force B. Buoyant force is equal to the weight of the liquid displaced 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 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. the weight of the body B. more than the weight of the body C. less than the weight of the body D. weight of the fluid displaced by the body 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. the weight of the body B. more than the weight of the body C. less than the weight of the body D. weight of the fluid displaced by the body How can relatively denser object be made to float on the less dense fluid? A. By altering the shape B. By altering the forces acting on the object C. By altering the shear forces acting on the object D. None of the mentioned How can relatively denser object be made to float on the less dense fluid? A. By altering the shape B. By altering the forces acting on the object C. By altering the shear forces acting on the object D. None of the mentioned The conditions for the stable equilibrium of a floating body are A. the metacenter should lie above the center of gravity B. the center of buoyancy and the center of gravity must lie on the same vertical line C. a righting couple should be formed D. all the above The conditions for the stable equilibrium of a floating body are A. the metacenter should lie above the center of gravity B. the center of buoyancy and the center of gravity must lie on the same vertical line C. a righting couple should be formed D. all the above Metacentric height is given as the distance between A. the center of gravity of the body and the meta center B. the center of gravity of the body and the center of buoyancy C. the center of gravity of the body and the center of pressure D. center of buoyancy and metacenter Metacentric height is given as the distance between A. the center of gravity of the body and the meta center B. the center of gravity of the body and the center of buoyancy C. the center of gravity of the body and the center of pressure D. center of buoyancy and metacenter Metacenter is the point of intersection of A. vertical upward force through cg of body and center line of body B. buoyant force and the center line of body C. midpoint between e.g. and center of buoyancy D. all of the above Metacenter is the point of intersection of A. vertical upward force through cg of body and center line of body B. buoyant force and the center line of body C. midpoint between e.g. and center of buoyancy D. all of the above When a body floating in a liquid, is displaced slightly, it oscillates about A. cg of body B. center of pressure C. center of buoyancy D. metacenter When a body floating in a liquid, is displaced slightly, it oscillates about A. cg of body B. center of pressure C. center of buoyancy D. metacenter When the ship’s metacenter and center of gravity coincide at same point then the vessel is said to be in A. equilibrium B. stable equilibrium C. unstable equilibrium D. neutral equilibrium When the ship’s metacenter and center of gravity coincide at same point then the vessel is said to be in A. equilibrium B. stable equilibrium C. unstable equilibrium D. neutral equilibrium Energy gradient line takes into consideration A. potential and kinetic heads only B. potential and pressure heads only C. kinetic and pressure heads only D. potential, kinetic and pressure heads Energy gradient line takes into consideration A. potential and kinetic heads only B. potential and pressure heads only C. kinetic and pressure heads only D. potential, kinetic and pressure heads Hydraulic gradient line takes into consideration A. potential and kinetic heads only B. potential and pressure heads only C. kinetic and pressure heads only D. potential, kinetic and pressure heads Hydraulic gradient line takes into consideration A. potential and kinetic heads only B. potential and pressure heads only C. kinetic and pressure heads only D. potential, kinetic and pressure heads Which of the following is true? A. EGL always drops in the direction of flow B. EGL always rises in the direction of flow C. EGL always remains constant in the direction of flow D. EGL may or may not change in the direction of flow Which of the following is true? A. EGL always drops in the direction of flow B. EGL always rises in the direction of flow C. EGL always remains constant in the direction of flow D. EGL may or may not change in the direction of flow Which of the following is true? A. HGL will never be above EGL B. HGL will never be under EGL C. HGL will never coincide with EGL D. HGL will may or may not be above EGL Which of the following is true? A. HGL will never be above EGL B. HGL will never be under EGL C. HGL will never coincide with EGL D. HGL will may or may not be above EGL The vertical intercept between EGL and HGL is equal to A. pressure head B. potential head C. kinetic head D. Piezometric head The vertical intercept between EGL and HGL is equal to A. pressure head B. potential head C. kinetic head D. Piezometric head The slope of HGL will be A. greater than that of EGL for a pipe of uniform cross-section B. smaller than that of EGL for a pipe of uniform cross-section C. equal than that of EGL for a pipe of uniform cross-section D. independent of that of EGL for a pipe of uniform cross-section The slope of HGL will be A. greater than that of EGL for a pipe of uniform cross-section B. smaller than that of EGL for a pipe of uniform cross-section C. equal than that of EGL for a pipe of uniform cross-section D. independent of that of EGL for a pipe of uniform cross-section Equation of continuity is based on the principle of conservation of A. mass B. energy C. momentum D. none of the above Equation of continuity is based on the principle of conservation of A. mass B. energy C. momentum D. none of the above Bernoulli’s equation deals with the law of conservation of A. mass B. momentum C. energy D. work Bernoulli’s equation deals with the law of conservation of A. mass B. momentum C. energy D. work All the terms of energy in Bernoulli’s equation have dimension of A. energy B. work C. mass D. length All the terms of energy in Bernoulli’s equation have dimension of A. energy B. work C. mass D. length The losses of energy in pipes due to A. Friction of surface B. Sudden enlargement or contraction of area C. Any obstruction in the path of flow D. All of these The losses of energy in pipes due to A. Friction of surface B. Sudden enlargement or contraction of area C. Any obstruction in the path of flow D. All of these The major loss of energy in long pipes is due to A. sudden enlargement B. sudden contraction C. gradual contraction or enlargement D. friction The major loss of energy in long pipes is due to A. sudden enlargement B. sudden contraction C. gradual contraction or enlargement D. friction Which one of the following is a major loss? A. frictional loss B. shock loss C. entry loss D. exit loss Which one of the following is a major loss? A. frictional loss B. shock loss C. entry loss D. exit loss Minor losses occur due to A. sudden enlargement in the pipe B. sudden contraction in the pipe C. bends in pipe D. all of the above Minor losses occur due to A. sudden enlargement in the pipe B. sudden contraction in the pipe C. bends in pipe D. all of the above Minor losses do not make any serious effect in A. short pipes B. long pipes C. both the short as well as long pipes D. cannot say Minor losses do not make any serious effect in A. short pipes B. long pipes C. both the short as well as long pipes D. cannot say In series – pipe problems A. the head loss is same through each pipe B. the discharge is same through each pipe C. a trial solution is not necessary D. the discharge through each pipe is added to obtain total discharge In series – pipe problems A. the head loss is same through each pipe B. the discharge is same through each pipe C. a trial solution is not necessary D. the discharge through each pipe is added to obtain total discharge Which of the following conditions is valid in the case of flow through parallel pipes? A. The rate of discharge in the main line is not equal to the sum of the discharges in each of the parallel pipes B. The velocity of flow in the main line is equal to the sum of the velocities in each of the parallel pipes C. The loss of head in each parallel pipe is different D. The rate of discharge in the main line is equal to the sum of discharges in each of the parallel pipes Which of the following conditions is valid in the case of flow through parallel pipes? A. The rate of discharge in the main line is not equal to the sum of the discharges in each of the parallel pipes B. The velocity of flow in the main line is equal to the sum of the velocities in each of the parallel pipes C. The loss of head in each parallel pipe is different D. The rate of discharge in the main line is equal to the sum of discharges in each of the parallel pipes Two pipe systems are said to be equivalent when A. head loss and discharge are same in two systems B. length of pipe and discharge are same in two systems C. friction factor and length are same in two systems D. length and diameter are same in two systems Two pipe systems are said to be equivalent when A. head loss and discharge are same in two systems B. length of pipe and discharge are same in two systems C. friction factor and length are same in two systems D. length and diameter are same in two systems The ratio of absolute viscosity to mass density is known as A. specific viscosity B. viscosity index C. kinematic viscosity D. coefficient of viscosity The ratio of absolute viscosity to mass density is known as A. specific viscosity B. viscosity index C. kinematic viscosity D. coefficient of viscosity The magnitude of water hammer effect in a pipe depends on A. speed at which the valve is closed B. length of the pipe C. elastic properties of the pipe material D. all of the above The magnitude of water hammer effect in a pipe depends on A. speed at which the valve is closed B. length of the pipe C. elastic properties of the pipe material D. all of the above The phenomenon of water hammer takes place in pipes A. when water is suddenly accelerated by opening the valve B. when fluid is moving with high head C. when pressure is reduced to zero D. when fluid is suddenly brought to rest by closing the valve The phenomenon of water hammer takes place in pipes A. when water is suddenly accelerated by opening the valve B. when fluid is moving with high head C. when pressure is reduced to zero D. when fluid is suddenly brought to rest by closing the valve Water hammer pressure can be considerably reduced using A. slow closing valves B. rapid closing valves C. both slow and rapid closing valves D. none of the avalves Water hammer pressure can be considerably reduced using A. slow closing valves B. rapid closing valves C. both slow and rapid closing valves D. none of the avalves The ratio of inertia force and gravitational force is called as ______ A. Reynolds number B. Stokes number C. Froude’s number D. Euler’s number The ratio of inertia force and gravitational force is called as ______ A. Reynolds number B. Stokes number C. Froude’s number D. Euler’s number Which geometric parameter determines the efficiency of the channel? A. Hydraulic depth B. Hydraulic radius C. Section factor D. Normal depth Which geometric parameter determines the efficiency of the channel? A. Hydraulic depth B. Hydraulic radius C. Section factor D. Normal depth For a channel to be economic which of the following parameters should be minimum? A. Wetted perimeter B. Wetted area C. Section factor D. Hydraulic depth For a channel to be economic which of the following parameters should be minimum? A. Wetted perimeter B. Wetted area C. Section factor D. Hydraulic depth What is the depth of flow in case most economical circular section considering maximum velocity? A. 0.61D B. 0.71D C. 0.81D D. 0.91D What is the depth of flow in case most economical circular section considering maximum velocity? A. 0.61D B. 0.71D C. 0.81D D. 0.91D Differential manometer is used to measure A. Pressure in pipes, channels etc. B. Atmospheric pressure C. Very low pressure D. Difference of pressure between two points Differential manometer is used to measure A. Pressure in pipes, channels etc. B. Atmospheric pressure C. Very low pressure D. Difference of pressure between two points Non uniform 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 patterns are identical in each plane Non uniform 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 patterns are identical in each plane When a tube of smaller diameter is dipped in water, the water rises in the tube with an upward __________ surface. A. Concave B. Convex C. Plane D. None of these When a tube of smaller diameter is dipped in water, the water rises in the tube with an upward __________ surface. A. Concave B. Convex C. Plane D. None of these The tendency of a liquid surface to contract is due to the following property A. Cohesion B. Adhesion C. Viscosity D. Surface tension The tendency of a liquid surface to contract is due to the following property A. Cohesion B. Adhesion C. Viscosity D. Surface tension The pressure measured with the help of a pressure gauge is called A. Atmospheric pressure B. Gauge pressure C. Absolute pressure D. Mean pressure The pressure measured with the help of a pressure gauge is called A. Atmospheric pressure B. Gauge pressure C. Absolute pressure D. Mean pressure Capillary action is due to the A. Surface tension B. Cohesion of the liquid C. Adhesion of the liquid molecules and the molecules on the surface of a solid D. All of the above Capillary action is due to the A. Surface tension B. Cohesion of the liquid C. Adhesion of the liquid molecules and the molecules on the surface of a solid D. All of the above The intensity of pressure on an immersed surface __________ with the increase in depth A. Does not change B. Increases C. Decreases D. None of these The intensity of pressure on an immersed surface __________ with the increase in depth A. Does not change B. Increases C. Decreases D. None of these Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the A. Force of adhesion B. Force of cohesion C. Force of friction D. Force of diffusion Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the A. Force of adhesion B. Force of cohesion C. Force of friction D. Force of diffusion The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the A. Pressure head B. Velocity head C. Pressure head + velocity head D. Pressure head - velocity head The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the A. Pressure head B. Velocity head C. Pressure head + velocity head D. Pressure head - velocity head