Description : Which one of the following statements is correct ? a) For water at 100o Celsius at sea level, the vapour pressure is equal to atmospheric pressure b) Surface energy (or tension) is caused by ... it both in static and in dynamic conditions d) Air is 50,000 times more compressible than water
Last Answer : c) Viscosity of a fluid is the property exhibited by it both in static and in dynamic conditions
Description : 17. The specific weight of compressible fluids does not remain constant. A) True B) False
Last Answer : A
Description : A flow in which the volume of a fluid and its density does not change during the flow is called _________ flow. (A) Incompressible (B) Compressible (C) Viscous (D) None of these
Last Answer : Answer: Option A
Description : A fluid is said to be ideal, if it is (A) Incompressible (B) Viscous and incompressible (C) Inviscous and compressible (D) Inviscous and incompressible
Last Answer : Answer: Option D
Description : Poise is the unit of (A) Surface tension (B) Capillarity (C) Viscosity (D) Shear stress in fluids
Last Answer : Answer: Option C
Description : Without electrical, mechanical, gravitational, surface tension and motion effects, a system is called _____ system. A. Simple B. Simple compressible C. Compressible D. Independent
Last Answer : Simple compressible
Description : A flow in which __________ force is dominating over the viscosity is called turbulent flow. (A) Elastic (B) Surface tension (C) Viscous (D) Inertia
Description : Reynold's number is the ratio of the inertia force to the (A) Surface tension force (B) Viscous force (C) Gravity force (D) Elastic force
Last Answer : Answer: Option B
Description : Select the correct statement (A) Weber's number is the ratio of inertia force to elastic force. (B) Weber's number is the ratio of gravity force to surface tension force. (C) Weber's number ... force to pressure force. (D) Weber's number is the ratio of inertia force to surface tension force.
Description : The ratio of the inertia force to the __________ is called Euler's number. (A) Pressure force (B) Elastic force (C) Surface tension force (D) Viscous force
Description : Pick out the wrong statement. (A) The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonian fluids is (D/4L). ∆p (B) In the equation, T. gc = k. ... to motion (D) With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids
Last Answer : (D) With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids
Description : The energy equation, E + (p/ρ) + (V 2 /2g) + gZ = constant (E = internal energy/mass), is applicable to (A) Perfect gases only (B) Isothermal flow of gases (C) Adiabatic unsteady flow of gases (D) All compressible fluids
Last Answer : (D) All compressible fluids
Description : Potential flow is the flow of (A) Compressible fluids with shear (B) Compressible fluids with no shear (C) Incompressible fluids with shear (D) Incompressible fluids with no shear
Last Answer : (D) Incompressible fluids with no shear
Description : Lead ball falls through water more slowly than through air because A. The value of ‘g’ is less in water B. Density of air is less than that of water C. Of the viscous force in water D. Of the surface tension of water
Last Answer : ANSWER: C
Description : Ail oil drop spreads over water because (1) oil is lighter than water (2) oil is more viscous (3) oil does not mix with water (4) surface tension of oil is much smaller than that of water
Last Answer : (4) surface tension of oil is much smaller than that of water Explanation: Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. It is ... is caused by cohesion of similar molecules, and is responsible for many of the behaviors of liquids.
Description : Weber number is the ratio of inertial force to __________ force. (A) Surface tension (B) Gravity (C) Viscous (D) Elastic
Last Answer : (A) Surface tension
Description : The pressure co-efficient is the ratio of pressure forces to __________ forces. (A) Viscous (B) Inertial (C) Gravity (D) Surface tension
Last Answer : (A) Viscous
Description : If Reynolds number is greater than 1, then the (A) Viscous force is larger than the inertia force (B) Inertia force is larger than the viscous force (C) Inertia force is larger than the surface tension force (D) Inertia force is larger than the gravitational force
Last Answer : (B) Inertia force is larger than the viscous force
Description : Which of the following forces does not act on a fluid at rest? (A) Viscous force (B) Gravity force (C) Hydrostatic force (D) Surface tension force
Last Answer : (A) Viscous force
Description : Rain drops falling through atmospheric air attain limited terminal velocity, because of (A) Upward thrust due to air (B) Viscous force exerted by air (C) Surface tension effects of water (D) Force of gravity
Last Answer : Option B
Description : An oil drop spreads over water because (1) oil is lighter than water (2) oil is more viscous (3) oil does not mix with water (4) surface tension of oil is much smaller than that of water
Last Answer : surface tension of oil is much smaller than that of water
Description : The Stoke's stream function applies to the (A) Irrotational flow only (B) Ideal/non i viscous fluids only (C) Cases of axial symmetry (D) None of these
Last Answer : (C) Cases of axial symmetry
Description : Diaphragm valves are used for handling __________ fluids. (A) Corrosive (B) Viscous (C) Non-Newtonian (D) Solid suspended
Last Answer : (A) Corrosive
Description : Define surface tension and capillarity with sketch. Give practical example of each.
Last Answer : Surface tension: The property of liquid which enables it to resist tensile stress is called surface tension .In the following figure we can see the surface tension between water and air also between mercury and ... ground water in the bushes. ii) Water moving up a straw when deep in water glass.
Description : “The state of a simple compressible system is completely specified by two independent, intensive properties”. This is known as ______. A. Equilibrium postulate B. State postulate C. Environment postulate D. Compressible system postulate
Last Answer : State postulate
Description : The plastics made from cellulose resin (A) Are as clear as glass (B) Are tough and strong (C) Possess excellent electrical properties (D) All the above
Description : Froude number is significant in (A) Supersonics, as with projectile and jet propulsion (B) Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. (C) Simultaneous motion ... gravity forces, and wave making effect, as with ship's hulls (D) All of the above
Description : Reynolds number is significant in (A) Supersonics, as with projectile and jet propulsion (B) Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. (C) Simultaneous motion ... gravity forces, and wave making effect, as with ship's hulls (D) All of the above
Description : Mach number is significant in (A) Supersonics, as with projectiles and jet propulsion (B) Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. (C) Simultaneous motion through ... gravity force, and wave making effects, as with ship's hulls (D) All of the above
Description : Which one of the following statements is correct ? (a) Dynamic viscosity is the property of a fluid which is not in motion (b) Surface energy is a fluid property giving rise to the phenomenon ... results from the action of very high pressure (d) Real fluids have lower viscosity than ideal fluids
Last Answer : (d) Real fluids have lower viscosity than ideal fluids
Description : Materials for rain-proof coats and tents owe their water proof properties to _____? A. Surface tension B. Viscosity C. Elasticity D. Specific gravity
Last Answer : ANSWER: A
Description : Materials for rain proof coats and tents owe their water proof properties to – (1) Surface tension (2) Viscosity (3) Specific gravity (4) Elasticity
Last Answer : (1) Surface tension Explanation: Materials for rain proof coats and tents owe their water proof properties to Surface Tension. The surface of a liquid behaves like an elastic membrane and therefore, has a tendency to contract. This property of liquid is called Surface Tension.
Description : Material for rain-proof coats and tents owe their water proof properties to ----? A. Surface tension (Answer) B. Viscosity C. Specific gravity D. Elasticity
Last Answer : A. Surface tension (Answer)
Description : Which of the following properties of a fluid is responsible for offering resistance to shear? (A) Surface tension (B) Viscosity (C) Specific gravity (D) All (A), (B), and (C)
Last Answer : (B) Viscosity
Description : The intensive properties are (A) Molar volume, density, viscosity and boiling point (B) Refractive index and surface tension (C) Both (A) and (B) (D) None of these
Last Answer : (C) Both (A) and (B)
Description : Which one of the following statements most accurately relates the properties of a liquid at room temperature with its vapour pressure? A A liquid with a low vapour pressure will probably have a ... with a high vapour pressure will probably have high intermolecular forces and a low boiling point.
Last Answer : A A liquid with a low vapour pressure will probably have a high surface tension and a high boiling point.
Description : Materials for rain proof coats and tents owe their water proof properties to (1) Surface tension (2) Viscosity (3) Specific gravity (4) Elasticity
Last Answer : Surface tension
Description : The ultimate Settlement of a soil is directly proportional to: (A) Depth of the compressible soil strata (B) Compressive index (C) Both (a) and (b) (D) None of these
Last Answer : (D) None of these
Description : Pick up the incorrect statement from the following: (A) Compaction has no effect on the structure of a soil (B) Permeability decreases with increase in the dry density of a compacted soil (C) ... a dry side compacted soil (D) Dry side compaction soils swell more when given access to moisture
Last Answer : (A) Compaction has no effect on the structure of a soil
Description : Cohesive soils are generally (A) Plastic and also compressible (B) Elastic and also compressible (C) Plastic but incompressible (D) None of these
Last Answer : (A) Plastic and also compressible
Description : 04. All the gases are considered to have compressible flow and all the liquids are considered to have incompressible flow. A) Correct B) Incorrect
Description : Water is __________ liquid. (A) A compressible (B) An incompressible (C) Both A and B (D) None of these
Description : A point, in a compressible flow where the velocity of fluid is zero, is called (A) Critical point (B) Vena contracta C) Stagnation point (D) None of these
Description : The bulk modulus of elasticity (A) Has the dimensions of 1/pressure (B) Increases with pressure (C) Is large when fluid is more compressible (D) Is independent of pressure and viscosity
Description : A perfect gas (A) Has constant viscosity (B) Has zero viscosity (C) Is in compressible (D) None of the above
Description : Which of the following statement is correct? (A) In a compressible flow, the volume of the flowing liquid changes during the flow (B) A flow, in which the volume of the flowing liquid does not change, ... their own axes while flowing, the flow is said to be rotational flow (D) All of the above
Description : Pile foundation is generally provided if soil is (A) Compressible (B) Water logged (C) Made up (D) All the above
Description : Negative skin friction (A) Is a downward drag acting on a pile due to downward movement of the surrounding compressible soil relative to the pile (B) Develops due to lowering of ground water (C) Both (a) and (b) (D) Neither (a) not (b)
Description : State two properties and two uses of silicone fluids.
Last Answer : Properties :- 1. They can be used in temperature range of -90 0C to 220 0C 2. They have excellent dielectric properties over a wide range of temperature 3. They have ... release material: an odourless, non-toxic, noncarbonizing moulds release for rubber, plastics and metal die castings.
Description : List two important properties of Cutting Fluids.
Last Answer : Properties of Cutting Fluid: 1. High heat absorption 2. Good lubricating qualities to produce low coefficient of friction 3. Low viscosity to permit free flow of liquid 4. Non-corrosive to the work or ... to the skin of operator 8. Transparency so that the cutting action of the tool may be observed