**Option A:** Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive

**Option B:** A hydrometer used for the determination of specific gravities of liquids works on the principle

**Option C:** In case of unsteady fluid flow, the velocity at any given point does not change with time

**Option D:** Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure &

**Correct Answer: **In case of unsteady fluid flow, the velocity at any given point does not change with time ✔

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**Option A:** A fluid mass is free from shearing forces, when it is made to rotate with a uniform velocity

**Option B:** Newton’s law of viscosity is not applicable to the turbulent flow of fluid with linear velocity

**Option C:** Laminar flow of viscous liquids is involved in the lubrication of various types of bearings

**Option D:** Rise of water in capillary tubes reduces with the increasing diameter of capillary tubes

**Correct Answer: **B. Newton’s law of viscosity is not applicable to the turbulent flow of fluid with linear velocity

distribution ✔

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**Option A:** The eddy viscosity is a function of the type of turbulence involved

**Option B:** The eddy viscosity is a fluid property

**Option C:** The viscosity of gas increases with increase in temperature

**Option D:** The viscosity of a liquid increases with decrease in temperature

**Correct Answer: **The eddy viscosity is a fluid property ✔

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**Option A:** A Venturimeter with a fixed pressure drop discharges more, when the flow is vertically

**Option B:** The co-efficient of contraction of a Venturimeter is always unity

**Option C:** For a fixed pressure drop, the discharge of a gas through a Venturimeter is greater, when

**Option D:** None of these

**Correct Answer: **None of these ✔

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**Option A:** Human blood is a Newtonian fluid

**Option B:** A Newtonian fluid obeys Newton’s law of cooling

**Option C:** For a non-Newtonian fluid, a straight line passes through the origin in a plot between shear

**Option D:** Thin lubricating oil is an example of a non-Newtonian fluid

**Correct Answer: **B. A Newtonian fluid obeys Newton’s law of cooling ✔

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**Option A:** It is always parallel to the main direction of the fluid flow

**Option B:** It is a line across which there is no flow and it is equivalent to a rigid boundary

**Option C:** Streamlines intersect at isolated point of zero velocity and infinite velocity

**Option D:** The fluid lying between any two streamlines can be considered to be in isolation and the

**Correct Answer: **It is always parallel to the main direction of the fluid flow ✔

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**Option A:** The form drag is dependent upon the occurrence of a wake

**Option B:** The shear stress at any given cross-section of a pipe for steady flow (either laminar or turbulent) varies linearly as the radial distance

**Option C:** An ideal fluid is the one, which has negligible surface tension and obeys the Newton’s law of viscosity

**Option D:** Existence of the boundary layer in fluid flow is because of viscosity of the fluid.

**Correct Answer: **C. An ideal fluid is the one, which has negligible surface tension and obeys the Newton’s law of viscosity ✔

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**Option A:** Greater is the kinematic viscosity of the liquid, greater is the thickness of the boundary layer

**Option B:** Blowers develop a maximum pressure of 2 atmospheres

**Option C:** Friction losses in pipe fittings are generally expressed in terms of velocity heads

**Option D:** Fanning friction factor in case of turbulent flow of liquids in pipe depends upon relative

**Correct Answer: **Friction losses in pipe fittings are generally expressed in terms of velocity heads ✔

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**Option A:** For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that

**Option B:** Discharge of fluid through a Venturimeter depends upon the gage difference irrespective of

**Option C:** Venturimeter occupies less space than an orificemeter

**Option D:** Venturimeter incurs less power loss compared to an equivalent orificemeter

**Correct Answer: **Venturimeter occupies less space than an orificemeter ✔

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**Option A:** The discharge through a Venturimeter depends upon Δp only and is independent of

**Option B:** A Venturimeter with a given gage difference discharges at a greater rate, when the flow is

**Option C:** For a given pressure difference, the discharge of gas is greater through a Venturimeter, when

**Option D:** The overall pressure loss is the same in a given pipe line, whether a Venturimeter or a nozzle

**Correct Answer: **A. The discharge through a Venturimeter depends upon Δp only and is independent of

orientation of the meter ✔

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**Option A:** Momentum transfer in laminar flow results from velocity gradient

**Option B:** A fluid in equilibrium is not free from shear stress

**Option C:** The viscosity of a non-Newtonian fluid is a function of temperature only

**Option D:** Both B. and C.

**Correct Answer: **D. Both B. and C. ✔

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**Option A:** A forced vortex occurs when fluid rotates as a solid about an axis

**Option B:** In laminar flow, Newton’s law of viscosity does not apply

**Option C:** A free vortex occurs, when fluid rotates as a solid

**Option D:** In turbulent flow, there are neither cross-currents nor eddies

**Correct Answer: **A forced vortex occurs when fluid rotates as a solid about an axis ✔

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**Option A:** In a static mass of liquid, the pressure at a point is the same for all liquids

**Option B:** Pressure decreases exponentially with elevation in an isothermal atmosphere

**Option C:** Atmospheric pressure = absolute pressure ‒ gage pressure

**Option D:** As per Pascal’s law, the pressure at a point in a static or uniformly moving fluid is equal in all

**Correct Answer: **In a static mass of liquid, the pressure at a point is the same for all liquids ✔

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**Option A:** The value of Mach number is always unity at the throat

**Option B:** No shock wave develops in the tube when the Mach number at exit is greater than unity

**Option C:** Throughout the converging portion of the tube, the density increases in the downstream

**Option D:** None of these

**Correct Answer: **No shock wave develops in the tube when the Mach number at exit is greater than unity ✔

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**Option A:** The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonian fluids is (D/4L). Δp

**Option B:** In the equation, T. gc = k. (du/dy)n the value of ‘n’ for pseudoplastic and Dilatant fluid are 1 respectively

**Option C:** Shear stress for Newtonian fluid is proportional to the rate of shear in the direction perpendicular to motion

**Option D:** With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids

**Correct Answer: **With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids ✔

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**Option A:** The vacuum pressure is always the negative gauge pressure

**Option B:** The pressure of the liquid measured by a piezometer tube is the gauge pressure

**Option C:** Manometric liquid should have high surface tension

**Option D:** The point at which the resultant pressure on an immersed surface acts, is known as the centre

**Correct Answer: **D. The point at which the resultant pressure on an immersed surface acts, is known as the centre

of gravity ✔

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**Option A:** Fanning friction factor is inversely proportional to Reynolds number always

**Option B:** The property of a randomly packed bed (with raschig rings) is given by the ratio of the total

**Option C:** Mach number in an incompressible fluid is always unity

**Option D:** Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under

**Correct Answer: **D. Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under

conditions of flow ✔

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**Option A:** Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation

**Option B:** Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in

**Option C:** Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines

**Option D:** Large scale cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine

**Correct Answer: **D. Large scale cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine

blades ✔

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**Option A:** Fluid flow control is required

**Option B:** Fluid contains dispersed solid particles

**Option C:** Valve is required to be either fully open or fully closed

**Option D:** One way flow is required

**Correct Answer: **Fluid flow control is required ✔

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**Option A:** Ejector

**Option B:** Blower

**Option C:** Injector

**Option D:** Airlift

**Correct Answer: **Airlift ✔

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## The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is__________?

**Option A:** √(HW/π)

**Option B:** HW/2 (H + W)2

**Option C:** HW/4 (H + W)2

**Option D:** 2HW/(H + W)

**Correct Answer: **HW/2 (H + W)2 ✔

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**Option A:** kg/hr

**Option B:** kg/m2. hr

**Option C:** kg/m2

**Option D:** kg/m3. hr

**Correct Answer: **kg/m2. hr ✔

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**Option A:** Increased, as it rises to a higher altitude

**Option B:** Due to the weight of the atmospheric air, that it displaces

**Option C:** Not dependent on the temperature of the atmosphere

**Option D:** None of these

**Correct Answer: **Due to the weight of the atmospheric air, that it displaces ✔

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**Option A:** Butterfly valve

**Option B:** Globe valve

**Option C:** Needle valve

**Option D:** None of these

**Correct Answer: **Butterfly valve ✔

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**Option A:** Particle size

**Option B:** Fluid viscosity

**Option C:** Density of both the particle & the fluid

**Option D:** All A., B. and C.

**Correct Answer: **D. All A., B. and C. ✔

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**Option A:** The velocity of sound

**Option B:** Dependent on its cross-sectional area

**Option C:** Dependent on fluid viscosity

**Option D:** Dependent on fluid density

**Correct Answer: **The velocity of sound ✔

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**Option A:** 4f (L/D) (v2/2gc) ρ

**Option B:** 32 (μLV/gc D2)

**Option C:** 16/NRe

**Option D:** (fLρ/D) (v2/2gc)

**Correct Answer: **32 (μLV/gc D2) ✔

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## The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is__________?

**Option A:** 4(Ro-Ri)

**Option B:** √(Ro-Ri)

**Option C:** 2(Ro-Ri)

**Option D:** Ro + Ri

**Correct Answer: **2(Ro-Ri) ✔

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**Option A:** VX = V0 + q (x3/L2D)

**Option B:** VX = V0 + ⅓q (x3/L2)

**Option C:** VX = V0 + 2q (x2/LD)

**Option D:** VX = V0 + (4/3) q (x3/L2D)

**Correct Answer: **VX = V0 + (4/3) q (x3/L2D) ✔

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**Option A:** Non-viscous

**Option B:** Viscous

**Option C:** Turbulent

**Option D:** Rotational

**Correct Answer: **Viscous ✔

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**Option A:** Directly as the velocity

**Option B:** Inversely as the square of the velocity

**Option C:** Approximately as the square of the velocity

**Option D:** Inversely as the square of the diameter

**Correct Answer: **Approximately as the square of the velocity ✔

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**Option A:** H

**Option B:** 12.6 H

**Option C:** 13.6 H

**Option D:** 14.6 H

**Correct Answer: **H ✔

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**Option A:** Vacuum pumps

**Option B:** Blowers

**Option C:** Fans

**Option D:** Compressors

**Correct Answer: **Compressors ✔

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**Option A:** First law of thermodynamics

**Option B:** Third law of thermodynamics

**Option C:** Law of conservation of momentum

**Option D:** None of these

**Correct Answer: **None of these ✔

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**Option A:** Diffusion

**Option B:** Centrifugal

**Option C:** Jet ejector

**Option D:** Piston

**Correct Answer: **Diffusion ✔

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**Option A:** Direction control

**Option B:** Back pressure

**Option C:** Relief

**Option D:** Pressure reduction

**Correct Answer: **Back pressure ✔

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**Option A:** Also increases

**Option B:** Decreases

**Option C:** Remain constant

**Option D:** First decreases, and then increases

**Correct Answer: **First decreases, and then increases ✔

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**Option A:** Increasing the acceleration head

**Option B:** Making the friction in pipe uniform

**Option C:** Decreasing the acceleration head

**Option D:** None of these

**Correct Answer: **Making the friction in pipe uniform ✔

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**Option A:** Manometric

**Option B:** Total

**Option C:** Static

**Option D:** Friction

**Correct Answer: **Manometric ✔

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**Option A:** High head

**Option B:** Low head but high discharge

**Option C:** Highly viscous liquid

**Option D:** Slurries of high solid concentration

**Correct Answer: **High head ✔

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**Option A:** Suction

**Option B:** Delivery

**Option C:** Manometric

**Option D:** None of these

**Correct Answer: **None of these ✔

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**Option A:** Static pressure

**Option B:** Dynamic pressure

**Option C:** Velocity at the stagnation point

**Option D:** All A., B. and C.

**Correct Answer: **D. All A., B. and C. ✔

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**Option A:** A, C, D

**Option B:** B, D, E

**Option C:** A, B, E

**Option D:** A, D, E

**Correct Answer: **A, B, E ✔

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**Option A:** Surface roughness and curvature (i.e. sharp corners)

**Option B:** Vibration

**Option C:** Pressure gradient and the compressibility of the flowing medium

**Option D:** All A., B. & C.

**Correct Answer: **D. All A., B. & C. ✔

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**Option A:** Viscous forces are unimportant

**Option B:** Viscous forces control

**Option C:** Viscous forces control and inertial forces are unimportant

**Option D:** Gravity forces control

**Correct Answer: **Viscous forces control ✔

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**Option A:** Globe valve

**Option B:** Gate valve

**Option C:** Needle valve

**Option D:** Butterfly valve

**Correct Answer: **Needle valve ✔

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**Option A:** Pressure

**Option B:** Maximum velocity

**Option C:** Average velocity

**Option D:** Point velocity

**Correct Answer: **Average velocity ✔

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**Option A:** Newtonian

**Option B:** Non-Newtonian

**Option C:** Ideal

**Option D:** Incompressible

**Correct Answer: **Newtonian ✔

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**Option A:** Hagen-Poiseuille’s equation

**Option B:** Stoke’s law

**Option C:** Navier-stokes equation

**Option D:** None of these

**Correct Answer: **Hagen-Poiseuille’s equation ✔

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**Option A:** Inner diameter

**Option B:** Outer diameter

**Option C:** Thickness

**Option D:** Neither inner nor outer diameter

**Correct Answer: **Neither inner nor outer diameter ✔

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**Option A:** Depends only on Reynolds number

**Option B:** Does not depend on Reynolds number

**Option C:** Depends on the roughness

**Option D:** None of these

**Correct Answer: **Depends only on Reynolds number ✔

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**Option A:** Is independent of the compressibility of the fluid

**Option B:** Is dependent upon the viscosity of the fluid

**Option C:** Represents the conservation of mass

**Option D:** None of these

**Correct Answer: **Represents the conservation of mass ✔

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**Option A:** Pseudo plastic

**Option B:** Bingham plastic

**Option C:** Dilatent

**Option D:** Newtonian

**Correct Answer: **Pseudo plastic ✔

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**Option A:** N √Q/H3/4

**Option B:** N √Q/H2/3

**Option C:** N3D5/H1/3

**Option D:** N √Q/H

**Correct Answer: **N √Q/H3/4 ✔

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**Option A:** 1.3

**Option B:** 0.766

**Option C:** 0.87

**Option D:** None of these

**Correct Answer: **0.766 ✔

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**Option A:** Constant along a streamline

**Option B:** Not constant along a streamline

**Option C:** Increased in the direction of flow

**Option D:** None of these

**Correct Answer: **Not constant along a streamline ✔

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**Option A:** Lρv2/D

**Option B:** LμV/D2

**Option C:** Dρv2/L

**Option D:** μV/L

**Correct Answer: **Lρv2/D ✔

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**Option A:** Normal

**Option B:** Parallel

**Option C:** Tangential

**Option D:** None of these

**Correct Answer: **Normal ✔

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**Option A:** I.D.

**Option B:** O.D.

**Option C:** Thickness

**Option D:** None of these

**Correct Answer: **I.D. ✔

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**Option A:** 2xy/(x + y)

**Option B:** xy/(x + y)

**Option C:** (x + y)/2xy

**Option D:** (x + y)/xy

**Correct Answer: **2xy/(x + y) ✔

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**Option A:** More

**Option B:** Less

**Option C:** Equal

**Option D:** Independent of porosity

**Correct Answer: **Less ✔

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**Option A:** Energy per unit mass

**Option B:** Energy per unit weight

**Option C:** Force per unit mass

**Option D:** None of these

**Correct Answer: **Energy per unit weight ✔

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**Option A:** Vmax = 2Vav

**Option B:** Vmax = Vav

**Option C:** Vmax = 1.5Vav

**Option D:** Vmax = 0.5Vav

**Correct Answer: **Vmax = 2Vav ✔

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**Option A:** Flow in straight lines only

**Option B:** Uniform flow

**Option C:** Steady uniform flow

**Option D:** Flow in which transverse components are zero

**Correct Answer: **Flow in which transverse components are zero ✔

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**Option A:** Produces only radial current

**Option B:** Produces only tangential current

**Option C:** Is effective over wide range of viscosities

**Option D:** Does not produce tangential current

**Correct Answer: **Is effective over wide range of viscosities ✔

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**Option A:** Always inversely proportional to the Reynolds number

**Option B:** Not dimensionless

**Option C:** Not dependent on the roughness of the pipe

**Option D:** None of these

**Correct Answer: **None of these ✔

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**Option A:** Thermal conductivity

**Option B:** Electrical conductivity

**Option C:** Specific gravity

**Option D:** Electrical resistivity

**Correct Answer: **Electrical conductivity ✔

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**Option A:** Centrifugal

**Option B:** Mixed flow

**Option C:** Axial flow

**Option D:** None of these

**Correct Answer: **Axial flow ✔

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**Option A:** Bingham plastic

**Option B:** Newtonian

**Option C:** Pseudo plastic

**Option D:** Dilatent

**Correct Answer: **Bingham plastic ✔

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**Option A:** Centrifugal

**Option B:** Reciprocating

**Option C:** Impulse

**Option D:** Parallel cylinder

**Correct Answer: **Impulse ✔

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**Option A:** Flow velocity

**Option B:** Pressure

**Option C:** Total energy

**Option D:** All A., B. and C.

**Correct Answer: **Flow velocity ✔

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**Option A:** Pipe becomes smoother with use

**Option B:** Friction factor increases linearly with time

**Option C:** Absolute roughness decreases with time

**Option D:** Absolute roughness increases linearly with time

**Correct Answer: **Absolute roughness increases linearly with time ✔

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**Option A:** < 2100

**Option B:** < 0.1

**Option C:** > 2.5

**Option D:** < 500

**Correct Answer: **< 0.1 ✔

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**Option A:** Small differential

**Option B:** Atmospheric

**Option C:** Absolute

**Option D:** Gage

**Correct Answer: **Small differential ✔

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**Option A:** Venturimeter

**Option B:** Pitot tube

**Option C:** Rotameter

**Option D:** None of these

**Correct Answer: **Rotameter ✔

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**Option A:** As square of

**Option B:** Directly as

**Option C:** As cube of

**Option D:** None of these

**Correct Answer: **As cube of ✔

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**Option A:** Discharge and overall efficiency

**Option B:** Volume swept by piston for one complete revolution and the pressure in the cylinder

**Option C:** Angle swept by the crank pin at any instant and the discharge

**Option D:** None of these

**Correct Answer: **Volume swept by piston for one complete revolution and the pressure in the cylinder ✔

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**Option A:** 33:3

**Option B:** 50

**Option C:** 66.6

**Option D:** 88.8

**Correct Answer: **66.6 ✔

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**Option A:** 25.61 kPa

**Option B:** 11.77 kPa

**Option C:** 14.86 kPa

**Option D:** 21.13 kPa

**Correct Answer: **11.77 kPa ✔

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**Option A:** Q∝N : H∝N2 : P∝N3

**Option B:** Q∝N2 : H∝N3 : P∝N

**Option C:** Q∝N : H∝N3 : P∝N2

**Option D:** Q∝N3 : H∝N : P∝N2

**Correct Answer: **Q∝N : H∝N2 : P∝N3 ✔

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**Option A:** Inverse

**Option B:** Square root

**Option C:** Second power

**Option D:** First power

**Correct Answer: **Square root ✔

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**Option A:** Non-sticky & non-corrosive nature

**Option B:** High vapour pressure

**Option C:** Low viscosity & surface tension

**Option D:** Low co-efficient of thermal expansion

**Correct Answer: **High vapour pressure ✔

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**Option A:** Its capacity varies directly as the square of speed

**Option B:** Head varies as the square of speed

**Option C:** Horsepower input varies as the square of speed

**Option D:** Head varies as the speed

**Correct Answer: **Head varies as the square of speed ✔

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**Option A:** Centrifugal

**Option B:** Reciprocating

**Option C:** Volute

**Option D:** Gear

**Correct Answer: **Centrifugal ✔

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**Option A:** Pitot tube

**Option B:** Venturimeter

**Option C:** Orificemeter

**Option D:** Rotameter

**Correct Answer: **Pitot tube ✔

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**Option A:** The S.I. unit of dynamic viscosity

**Option B:** The S.I. unit of kinematic viscosity

**Option C:** Equivalent to one poise

**Option D:** Equivalent to one stoke

**Correct Answer: **The S.I. unit of dynamic viscosity ✔

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**Option A:** ML-2

**Option B:** MT-2

**Option C:** MLT-2

**Option D:** ML-2T

**Correct Answer: **MT-2 ✔

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**Option A:** Increase

**Option B:** Decrease

**Option C:** Remain unchanged

**Option D:** Increase or decrease depending on the pipe material

**Correct Answer: **Increase ✔

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**Option A:** Flow nozzle

**Option B:** Venturimeter

**Option C:** Rotameter

**Option D:** None of these

**Correct Answer: **Rotameter ✔

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