Description : The fluid forces considered in the Navier Stokes equation are (A) Gravity, pressure and viscous (B) Gravity, pressure and turbulent (C) Pressure, viscous and turbulent (D) Gravity, viscous and turbulent
Last Answer : Answer: Option A
Description : Which of the fluid forces are not considered in the Reynold's equation of flow? (A) Viscous forces (B) Turbulent forces (C) Pressure forces (D) Compressibility forces
Last Answer : (D) Compressibility forces
Description : _________ fluid force is not considered in the Navier-Stokes equation. (A) Turbulent (B) Viscous (C) Gravity (D) Pressure
Last Answer : (A) Turbulent
Description : Pick out the wrong statement. (A) A fluid mass is free from shearing forces, when it is made to rotate with a uniform velocit (B) Newton's law of viscosity is not applicable to the ... types of bearings (D) Rise of water in capillary tubes reduces with the increasing diameter of capillary tubes
Last Answer : (B) Newton's law of viscosity is not applicable to the turbulent flow of fluid with linear velocity distribution
Description : Navier-Stokes equation is useful in the analysis of __________ fluid flow problems. (A) Non-viscous (B) Viscous (C) Turbulent (D) Rotational
Last Answer : (B) Viscous
Description : Pick out the wrong statement pertaining to fluid flow. (A) The ratio of average velocity to the maximum velocity for turbulent flow of Newtonian fluid in circular pipes is 0.5 (B) The Newtonian ... at the centre of the pipe (C) Navier-Stokes equation is applicable to the analysis of viscous flows
Last Answer : (A) The ratio of average velocity to the maximum velocity for turbulent flow of Newtonian fluid in circular pipes is 0.5
Description : Mach number is important in a fluid flow problem, when the inertia and __________ forces predominate. (A) Elastic (B) Viscous (C) Gravity (D) None of these
Last Answer : (A) Elastic
Last Answer : A) Elastic
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 : At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the (A) Buffer zone (B) Turbulent core (C) Both (A) and (B) (D) Viscous sub-layer
Last Answer : (D) Viscous sub-layer
Description : Turbulent flow generally occurs for cases involving (A) Highly viscous fluid (B) Very narrow passages (C) Very slow motion (D) None of these
Last Answer : (D) None of these
Description : Pick out the wrong statement. (A) Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive forces (B) A hydrometer used for the determination of ... Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure & velocity at a poin
Last Answer : (C) In case of unsteady fluid flow, the velocity at any given point does not change with time
Description : Pressure co-efficient is the ratio of pressure forces to __________ forces. (A) Gravity (B) Inertial (C) Viscous (D) None of these
Last Answer : (B) Inertial
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 : Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid flow control. It is caused due to (A) Reynold stresses (B) Shear forces (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : At low Reynolds number (A) Viscous forces are unimportant (B) Viscous forces control (C) Viscous forces control and inertial forces are unimportant (D) Gravity forces contro
Last Answer : (C) Viscous forces control and inertial forces are unimportant
Description : Reynolds number is the ratio of (A) Viscous forces to gravity forces (B) Inertial forces to viscous forces (C) Viscous forces to inertial forces (D) Inertial forces to gravity forces
Last Answer : (B) Inertial forces to viscous forces
Description : Forces acting on a particle settling in fluid are __________ forces. (A) Gravitational & buoyant (B) Centrifugal & drag (C) Gravitational or centrifugal buoyant drag (D) External, drag & viscous
Last Answer : (C) Gravitational or centrifugal buoyant drag
Description : Bernoulli's equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli's equation? A. Fluid flow is frictionless & irrotational. B. Fluid flow is ... A, C, D (B) B, D, E (C) A, B, E (D) A, D, E
Last Answer : (C) A, B, E
Description : Fluidised beds are formed, when the (A) Fluid friction is zero (B) Gravity force is less than the fluid friction (C) Pressure forces equal gravity forces (D) Sum of the fluid friction and pressure forces is equal and opposite to gravity forces
Last Answer : (B) Gravity force is less than the fluid friction
Description : Which of the following assumptions enables the Euler's equation of motion to be integrated? (A) The fluid is incompressible (B) The fluid is non-viscous (C) The continuity equation is satisfied (D) The flow is rotational and incompressible
Last Answer : (A) The fluid is incompressible
Description : Applicability of Bernoulli's equation is limited to a/an __________ fluid, that does not exchange shaft work with the surroundings. (A) Incompressible (B) Non-viscous (C) Both (A) and (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) and (B)
Description : When the pipe Reynold's number is 6000, the flow is generally (A) Viscous (B) Laminar (C) Turbulent (D) Transition
Last Answer : (C) Turbulent
Description : The Euler's equation for the motion of liquids is based upon the assumption that (A) The fluid is non - viscous, homogeneous and incompressible (B) The velocity of flow is uniform over the section (C) The flow is continuous, steady and along the stream line (D) All of the above
Last Answer : Answer: Option D
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 : In a fully turbulent flow (Re > 10 5 ) in a pipe of diameter 'd', for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is (A) d (B) d 2 (C) d 2.5 (D) d
Last Answer : (C) d 2.5
Description : Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the (A) Wall roughness (B) Reynolds number (C) Both (A) & (B) (D) Neither (A) nor (B)
Description : For turbulent flow of an incompressible fluid through a pipe, the flow rate ‘Q’ is proportional to (Δ P)n, where ΔP is the pressure drop. The value of exponent 'n' is (A) 1 (B) 0 (C) < 1 (D) > 1
Last Answer : (C) < 1
Description : Euler number is defined as the ratio of inertia force to __________ force. (A) Pressure (B) Elastic (C) Gravity (D) Viscous
Last Answer : (A) Pressure
Description : __________ forces act on a particle moving through a stationary fluid (A) Gravity (B) Drag (C) Buoyant (D) All (A), (B), & (C)
Last Answer : (D) All (A), (B), & (C)
Description : Existence of boundary layer in fluid flow is because of the (A) Surface tension (B) Fluid density (C) Fluid viscosity (D) Gravity forces
Last Answer : (C) Fluid viscosity
Description : The pressure at a point in a fluid is not the same in all directions, when the fluid is viscous and (A) Moving (B) Static (C) Cold (D) Hot
Last Answer : (A) Moving
Description : Pressure drop in packed bed for turbulent flow is given by the __________ equation. (A) Kozeny-Carman (B) Blake-Plummer (C) Leva's (D) Hagen-Poiseuille’s
Last Answer : (B) Blake-Plummer
Description : Euler's number is the ratio of __________ force to pressure force. (A) Inertia (B) Gravity (C) Viscous (D) None of these
Description : The product of mass and acceleration of flowing liquid is called (A) Inertia force (B) Viscous force (C) Gravity force (D) Pressure force
Description : Reynold's number is the ratio of inertia force to (A) Pressure force (B) Elastic force (C) Gravity force (D) Viscous force
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 : Euler's dimensionless number relates the following (A) Inertial force and gravity (B) Viscous force and inertial force (C) Viscous force and buoyancy force (D) Pressure force and inertial force
Description : A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle ... fluidisation velocity, VOM is (A) 12 mm/s (B) 16 mm/s (C) 24 mm/s (D) 28 mm/s
Last Answer : (B) 16 mm/s
Description : A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system ... What is the porosity of the fluidised bed? (A) 0.2 (B) 0.5 (C) 0.7 (D) 0.8
Last Answer : (C) 0.7
Description : Bernoulli's principle states that, for streamline motion of an incompressible non-viscous fluid: A. the pressure at any part + the kinetic energy per unit volume = constant B. the kinetic ... + the kinetic energy per unit volume + the potential energy per unit volume = constant
Last Answer : the pressure at any part + the kinetic energy per unit volume + the potential energy per unit volume = constant
Description : The pressure at a point in a fluid will not be same in all the directions when the fluid is (A) Moving (B) Viscous (C) Viscous and static (D) Viscous and moving
Description : A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation? (A) Inertial and drag forces are important (B) Drag ... forces are important (C) Drag force and gravitational forces are important (D) None of the above
Last Answer : (B) Drag, gravitational and buoyancy forces are important
Description : At high Reynolds number (A) Inertial forces control and viscous forces are unimportant (B) Viscous forces predominate (C) Inertial forces are unimportant and viscous forces control (D) None of these
Last Answer : (A) Inertial forces control and viscous forces are unimportant
Description : The ratio of inertial forces to viscous forces is called the __________ number. (A) Weber (B) Mach (C) Froude (D) Reynold
Last Answer : (D) Reynold
Description : Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone. (A) Laminar (B) Transition (C) Both 'a' & 'b' (D) Highly turbulent
Last Answer : (D) Highly turbulent
Description : A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter 'd'. For a fixed mass flow rate, the tube side heat transfer coefficient for turbulent flow conditions is proportional to (A) d 0.8 (B) d -0.2 (C) d -1 (D) d -1.8
Last Answer : (B) d -0.2
Description : Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is (A) 0.2 (B) 0.4 (C) 0.6 (D) 0.8
Last Answer : (C) 0.6
Description : At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe? (A) 0.5 (B) < 0.5 (C) > 0.6 (D) < 0.1
Last Answer : (C) > 0.6
Description : In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant? (A) Rotational (B) Unsteady (C) Turbulent (D) Non-uniform
Last Answer : (D) Non-uniform