Fluid Mechanics – Stuffworking.com https://stuffworking.com Know The Basic Fri, 19 Jun 2020 04:54:21 +0000 en hourly 1 https://wordpress.org/?v=6.1 https://stuffworking.com/wp-content/uploads/2019/01/cropped-images-1-32x32.jpg Fluid Mechanics – Stuffworking.com https://stuffworking.com 32 32 Fluid Mechanics MCQ 15 https://stuffworking.com/fluid-mechanics-mcq-15/ https://stuffworking.com/fluid-mechanics-mcq-15/#respond Fri, 19 Jun 2020 04:51:36 +0000 http://stuffworking.com/?p=1737 The post Fluid Mechanics MCQ 15 appeared first on Stuffworking.com.

]]> << MCQ 12 MCQ 13 MCQ 14 MCQ 15

1. The Bernoulli's equation is based on the assumption that
2. Coefficient of resistance is the ratio of
3. The coefficient of discharge for an external mouthpiece is
4. 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
5. In order to measure the flow with a venturimeter, it is installed in
6. In a venturimeter, the velocity of liquid at throat is __________ than at inlet.
7. The centre of buoyancy is the centre of area of the immersed body.
8. The stability of a dam is checked for
9. The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number)
10. The pressure less than atmospheric pressure is known as
11. The metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.
12. The maximum efficiency of transmission through a pipe is
13. An ideal fluid is frictionless and incompressible.
14. In open channels, the specific energy is the
15. A siphon is used to connect two reservoirs at different levels intervened by a high ridge.
16. The pressure measured with the help of a piezometer tube is in
17. A flow in which the volume of a fluid and its density does not change during the flow is called __________ flow.
18. The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)
19. The loss of head due to an obstruction in a pipe is twice the loss of head at its entrance.
20. In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.
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]]> << MCQ 12 MCQ 13 MCQ 14 MCQ 15 >>

1. A flow through a long pipe at constant rate is called
2. A weir is usually made of masonry or concrete.
3. If a pitot tube is placed with its nose upstream, downstream or sideways, the reading will be the same in every case.
4. The volume per unit mass of a liquid is called specific volume.
5. Coefficient of contraction is the ratio of
6. A flow in which each liquid particle does not have a definite path and the paths of individual particles also cross each other, is called
7. A weir is said to be broad crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.
8. One litre of water occupies a volume of
9. In an external or internal mouthpiece, the absolute pressure head at vena contracta is zero when atmospheric pressure head is 10.3 m of water.
10. The value of bulk modulus of a fluid is required to determine
11. A flow in which the viscosity of fluid is dominating over the inertia force is called
12. In a free nappe,
13. A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid)
14. An air vessel is provided at the summit in a syphon to
15. An error of 1% in measuring head over the apex of the notch (H) will produce an error of __________ in discharge over a triangular notch.
16. The Reynold's number of a ship is __________ to its velocity and length.
17. When a tube of smaller diameter is dipped in water, the water rises in the tube due to viscosity of water.
18. According to equation of continuity for incompressible fluid
19. The weight per unit volume of a liquid at a standard temperature and pressure is called
20. The coefficient of viscosity may be determined by
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]]> << MCQ 11 MCQ 12 MCQ 13 MCQ 14 >>

1. The velocity at which the laminar flow stops, is known as
2. The hydraulic gradient line may be above or below the centre line of the pipe.
3. The ratio of the inertia force to the gravity force is called Froude number.
4. A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is
5. The Francis formula for the discharge over Cippoletti weir is
6. An open tank containing liquid is made to move from rest with a uniform acceleration. The angle θ which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity)
7. A manometer can be used to measure vacuum pressures.
8. The loss of pressure head in case of laminar flow is proportional to
9. The viscosity of a liquid is due to cohesion of its particles.
10. When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as
11. The tendency of a liquid to uplift a submerged body, because of the upward thrust of the liquid, is known as buoyancy.
12. The flow of water through the hole in the bottom of a wash basin is an example of
13. A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if
14. The Newton's law of resistance is based on the assumption that the
15. If a body floating in a liquid does not return back to its original position, and heels farther "away when given a small angular displacement, the body is said to be in neutral equilibrium.
16. In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be
17. The shear stress-strain graph for a newtonian fluid is a
18. The length of the divergent cone in a venturimeter is __________ that of the convergent cone.
19. The Euler's equation for the motion of liquids is based upon the assumption that
20. The viscosity of mercury is __________ than that of water.
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]]> << MCQ 10 MCQ 11 MCQ 12 MCQ 13 >>

1. The flow in a pipe is neither laminar nor turbulent when Reynold number is
2. The flow in a pipe is turbulent when Reynold number is
3. For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called
4. The intensity of pressure on an immersed surface __________ with the increase in depth.
5. When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid
6. The buoyancy depends upon the
7. The velocity corresponding to Reynold number of 2800, is called
8. In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.
9. When the pipes are in series, the total head loss is equal to the sum of the head loss in each pipe.
10. When a cylindrical vessel containing liquid is revolved, the surface of the liquid takes the shape of
11. The specific gravity has no units.
12. Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, at right angles to the direction of flow of the liquid is known as lift.
13. A flow in which __________ force is dominating over the viscosity is called turbulent flow.
14. Reynold's number is the ratio of inertia force to
15. If an incompressible liquid is continuously flowing through a pipe, the quantity of liquid passing per second is different at different sections.
16. The unit of dynamic viscosity in S.I. units is
17. The atmospheric pressure at sea level is
18. When the pressure intensity at a point is less than the local atmospheric pressure, then the difference of these two pressures is called vacuum pressure.
19. The depth of water in a channel corresponding to the minimum specific energy is known as critical depth.
20. Bulk modulus of a fluid __________ as the pressure increases.
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]]> << MCQ 9 MCQ 10 MCQ 11 MCQ 12 >>

1. The specific weight of water in S.I. unit is
2. A body floating in a liquid is said to be in a stable equilibrium, if its metacentre coincides with its centre of gravity.
3. The flow in a pipe is laminar, when Reynold number is less than 2000.
4. The specific weight of sea water is __________ that of pure water.
5. The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to
6. If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, The body is said to be in __________ equilibrium.
7. According to Pascal's law, the intensity of pressure at any point in a fluid at rest is the same in all directions.
8. The ratio of velocity of fluid in an undisturbed stream to the velocity of sound wave is known as Mach number.
9. The total energy line lies over the centre line of the pipe by an amount equal to
10. The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.
11. The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called
12. The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to
13. All the gases are considered to have compressible flow and all the liquids are considered to have incompressible flow.
14. A flow is called sub-sonic, if the Mach number is
15. A piezometer tube is used only for measuring
16. The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.
17. An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.
18. The ratio of the inertia force to the surface tension force is called Weber's number.
19. Re-entrant or Borda's mouthpiece is an __________ mouthpiece.
20. Euler's number is the ratio of __________ force to pressure force.
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]]> << MCQ 8 MCQ 9 MCQ 10 MCQ 11 >>

1. The ratio of the inertia force to the viscous force is called
2. A venturiflume is used to measure
3. A flow whose streamline is represented by a straight line, is called __________ dimensional flow.
4. The vacuum pressure is always the negative gauge pressure.
5. The tangential velocity of the water element having a free vortex is
6. The value of coefficient of discharge is __________ the value of coefficient of velocity.
7. The unit of kinematic viscosity in S. I. units is
8. When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as
9. Turbulent flow takes place at high velocities.
10. A fluid whose viscosity does not change with the rate of deformation or shear strain is known as
11. The line of action of the force of buoyancy acts through the centre of gravity of the volume of the liquid displaced.
12. The metacentric height is the distance between the
13. In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.
14. A flow through an expanding tube at increasing rate is called unsteady non-uniform flow.
15. Viscous force is the __________ of shear stress due to viscosity and cross-sectionar area of flow.
16. The rise, in water level, which occurs during the transformation of the unstable shooting flow to the stable streaming flow is called hydraulic jump.
17. The density of air is same at different heights.
18. The velocity corresponding to Reynold number of 2000 is called
19. The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)
20. Water is __________ liquid.
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]]> << MCQ 7 MCQ 8 MCQ 9 MCQ 10 >>

1. The liquid used in manometers should have
2. When the end contractions of the weir are suppressed, then number of end contractions (n) are taken as zero
3. A submerged body is said to be in a stable equilibrium, if its centre of gravity __________ the centre of buoyancy.
4. A flow is called hyper-sonic, if the Mach number is
5. The velocity at which the flow changes from laminar flow to turbulent flow is called
6. When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure __________ that if the same plate is immersed perpendicular to the flow.
7. The viscosity of a liquid __________ its rate of flow through a hole in a vessel.
8. Reynold's number is the ratio of the inertia force to the
9. The variation in the volume of a liquid with the variation of pressure is called its
10. The formula for discharge over a sharp-crested weir and Ogee weir is same as that of a rectangular weir
11. The discharge through a channel of trapezoidal section is maximum when
12. The Cippoletti weir is a __________ weir.
13. A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is
14. The pressure of a liquid measured with the help of a piezometer tube is
15. The hydraulic mean depth for a circular pipe of diameter (d) is
16. The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the
17. A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.
18. Gauge pressure at a point is equal to the absolute pressure __________ the atmospheric pressure.
19. The flow in a pipe or channel is said to be non-uniform when
20. The pressure measured with the help of a pressure gauge is called
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]]> << MCQ 6 MCQ 7 MCQ 8 MCQ 9 >>

1. The total energy of a liquid particle in motion is equal to
2. The absolute pressure is equal to
3. The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __________ of the total supply head.
4. When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called
5. A differential manometer is used to measure
6. The hydraulic mean depth or the hydraulic radius is the ratio of
7. Coefficient of velocity is defined as the ratio of
8. A notch is used to measure __________ of liquids.
9. A flow is called sonic, if the Mach number is unity.
10. Stoke is the unit of
11. The hammer blow in pipes occurs when
12. An error of 1% in measuring head over the crest of the notch (H) will produce an error of __________ in discharge over a triangular notch,
13. When a body is placed over a liquid, it will sink down if
14. One poise is equal to
15. A flow whose streamline is represented by a curve, is called
16. A flow through a long pipe at decreasing rate is called __________ uniform flow.
17. The intensity of pressure at any point, in a liquid, is
18. The surface tension of mercury at normal temperature is __________ that of water.
19. When the Mach number is less than unity, the flow is called
20. If the depth of water in an open channel is greater than the critical depth, the flow is called
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]]> << MCQ 5 MCQ 6 MCQ 7 MCQ 8 >>

1. The pressure intensity in kN/m2 (or kPa) at any point in a liquid is (where w = Specific weight of liquid, and h = Depth of liquid from the surface)
2. The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is
3. Falling drops of water become spheres due to the property of
4. The hydraulic gradient line is always parallel to the centre line of the pipe.
5. The property of a liquid which controls its rate of flow is called viscosity.
6. The D-Alembert's principle is used for changing the dynamic equilibrium of a fluid mass, into a static equilibrium.
7. The dynamic viscosity of the liquid __________ with rise in temperature.
8. A manometer is used to measure
9. The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is
10. The product of mass and accelaration of flowing liquid is called
11. When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures.
12. Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, in the direction of flow of the liquid, is known as
13. Barometer is used to measure
14. The frictional resistance of a pipe varies approximately with __________ of the liquid.
15. A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end.
16. When the Mach number is between __________ the flow is called super-sonic flow.
17. If the coefficient of discharge is 0.6, then the discharge over a right angled notch is
18. If the value of coefficient of discharge increases, the discharge through the orifice decreases.
19. A point, in a compressible flow where the velocity of fluid is zero, is called
20. The height of a water column equivalent to a pressure of 0.15 MPa is
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]]> << MCQ 4 MCQ 5 MCQ 6 MCQ 7 >>

1. When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure
2. An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice.
3. The pressure of air __________ with the increase of height from the surface of the earth.
4. The coefficient of discharge in case of internal mouthpiece is __________ that of external mouthpiece.
5. The discharge over a rectangular notch is
6. The sheet of water flowing over a notch or a weir is known as
7. The specific weight of compressible fluids does not remain constant.
8. According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)
9. The volume of a fluid __________ as the pressure increases.
10. When the venturimeter is inclined, then for a given flow it will show __________ reading.
11. The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called
12. The pressure of the liquid flowing through the divergent portion of a venturimeter
13. In a convergent mouthpiece, the absolute pressure head at vena contracta is the same as that of the atmosphere.
14. The vacuum pressure can be measured with the help of a piezometer tube.
15. A body floating in a liquid is said to be not in equilibrium if its metacentre lies below its centre of gravity.
16. A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct?
17. Newton's law of viscosity is a relationship between
18. A flow in which the quantity of liquid flowing per second is not constant, is called
19. Water is a __________
20. In a sharp-crested weir, the thickness of the weir is kept less than half of the height of water above the crest of the weir.
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