Fluid Mechanics For Chemical MCQs

Option A: 0

Option B: 1

Option C: ∞

Option D: 0.5

Correct Answer: 1 ✔

Option A: Venturimeter

Option B: Orificemeter

Option C: Anemometer

Option D: Rotameter

Correct Answer: Rotameter ✔

Option A: Fanning equation

Option B: Blake-Plummer equation

Option C: Hagen-Poiseuille equation

Option D: Kozeny-Carman equation

Correct Answer: Blake-Plummer equation ✔

Option A: Length is shorter

Option B: Throat diameter is more

Option C: Sudden expansion of flow in the downstream occurs

Option D: Distance between the throat and the inlet is more

Correct Answer: Sudden expansion of flow in the downstream occurs ✔

Option A: Globe valve

Option B: Plug-cock

Option C: Gate valve

Option D: Check valve

Correct Answer: Gate valve ✔

Option A: 1

Option B: 1.5

Option C: 2

Option D: 2.5

Correct Answer: 1 ✔

Option A: 40° and 140°

Option B: 45° and 60°

Option C: 90° and 80°

Option D: 20° and 120°

Correct Answer: 40° and 140° ✔

Option A: T-joint

Option B: Union

Option C: 45° elbow

Option D: 90°bend

Correct Answer: Union ✔

Option A: Flanges

Option B: Welding

Option C: Soldering

Option D: Bell and spigot joint

Correct Answer: Bell and spigot joint ✔

Option A: Q1/Q2

Option B: Q2/Q1

Option C: (Q2 – Q1)/Q1

Option D: (Q2 – Q1)/Q2

Correct Answer: D. (Q2 – Q1)/Q2 ✔

Option A: Geometrical similarity only

Option B: Dynamic similarity only

Option C: Both geometrical and dynamic similarity

Option D: All geometrical, dynamic and kinematic similarity

Correct Answer: All geometrical, dynamic and kinematic similarity ✔

Option A: Increases in the downstream direction

Option B: Is constant

Option C: Decreases in the downstream direction

Option D: Is independent of the area of flow

Correct Answer: Increases in the downstream direction ✔

Option A: Velocity is constant along a stream line

Option B: Energy is constant throughout the fluid

Option C: Energy is constant along a stream line, but may vary across stream lines

Option D: None of these

Correct Answer: Energy is constant along a stream line, but may vary across stream lines ✔

Option A: I, II, III

Option B: II, III, V

Option C: I, II, V

Option D: II, IV, V

Correct Answer: II, III, V ✔

Option A: Compress air

Option B: Lift compressed air

Option C: Lift water from a well by using compressed air

Option D: Lift air under negative pressure

Correct Answer: Lift water from a well by using compressed air ✔

Option A: Increase

Option B: Decrease

Option C: Remain same

Option D: Data insufficient to predict

Correct Answer: Decrease ✔

Option A: Motion of water around a ship in a lake

Option B: Motion of river around bridge piers

Option C: Steadily decreasing flow through a reducing section

Option D: Steadily increasing flow through a pipe

Correct Answer: Steadily decreasing flow through a reducing section ✔

Option A: Gravity

Option B: Inertial

Option C: Viscous

Option D: None of these

Correct Answer: Inertial ✔

Option A: Pressure-co-efficient

Option B: Froude number

Option C: Kinematic viscosity

Option D: Weber number

Correct Answer: Kinematic viscosity ✔

Option A: Diameter

Option B: Colour

Option C: Altitude

Option D: None of these

Correct Answer: Colour ✔

Option A: 1000

Option B: 2000

Option C: 3000

Option D: 4000

Correct Answer: 4000 ✔

Option A: Higher pressure

Option B: Slurries

Option C: Viscous mass

Option D: None of these

Correct Answer: Higher pressure ✔

Option A: 600

Option B: 660

Option C: 1.1

Option D: 60

Correct Answer: 660 ✔

Option A: Inlet tip of a blade curves in a direction opposite to that

Option B: Outlet tip of a blade curves in a direction opposite to that

Option C: Inlet tip of a blade is towards the direction

Option D: Outlet tip of a blade is towards the direction

Correct Answer: Outlet tip of a blade is towards the direction ✔

Option A: Same in both the tubes

Option B: Greater in 1 mm dia tube

Option C: Greater in 0.5 mm dia tube

Option D: Zero in both the tubes

Correct Answer: Greater in 0.5 mm dia tube ✔

Option A: < 1

Option B: > 1

Option C: < 5

Option D: None of these

Correct Answer: < 1 ✔

Option A: 0.5

Option B: 5

Option C: 50

Option D: 500

Correct Answer: 5 ✔

Option A: Elevation

Option B: Pressure

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: Pressure ✔

Option A: 4.33 psi, 10 ft. of water, 8.83 inches of Hg

Option B: 4.33 psi, 10 ft. of water, 20.7 inches of Hg

Option C: 10 psi, 19.7 ft. of water, 23.3 inches of Hg

Option D: 10 psi, 19.7 ft. of water, 5.3 inches of Hg

Correct Answer: 4.33 psi, 10 ft. of water, 8.83 inches of Hg ✔

Option A: f1 = f2

Option B: f1 < f2

Option C: f1 > f2

Option D: Data not sufficient to relate f1 & f2

Correct Answer: f1 > f2 ✔

Option A: Increases as fluid viscosity increases

Option B: Increases as pipe diameter increases

Option C: Independent of fluid density

Option D: None of these

Correct Answer: Increases as pipe diameter increases ✔

Option A: Velocity

Option B: Velocity head

Option C: Turbulence

Option D: None of these

Correct Answer: Velocity ✔

Option A: Momentum

Option B: Mass

Option C: Energy

Option D: Both B. & C.

Correct Answer: Mass ✔

Option A: Surface tension

Option B: Fluid density

Option C: Fluid viscosity

Option D: Gravity forces

Correct Answer: Fluid viscosity ✔

Option A: Directly proportional to

Option B: Directly proportional to square of

Option C: Inversely proportional to

Option D: Inversely proportional to square of

Correct Answer: Directly proportional to ✔

Option A: Same rate of flow passes through

Option B: Head loss is same through

Option C: Rate of flow in each pipe is proportional to the length of

Option D: Total flow rate is the sum of flow rate in

Correct Answer: Same rate of flow passes through ✔

Option A: 0.5

Option B: 1

Option C: 1.5

Option D: 2

Correct Answer: 0.5 ✔

Option A: Avoid priming, every time we start the pump

Option B: Remove the contaminant present in the liquid

Option C: Minimise the fluctuation in discharge

Option D: Control the liquid discharge

Correct Answer: Avoid priming, every time we start the pump ✔

Option A: 1/μ

Option B: μ

Option C: μ2

Option D: 1/μ2

Correct Answer: μ ✔

Option A: Fanning equation

Option B: Kozeny – Karman equation

Option C: Hagen-Poiseuille equation

Option D: Blake-Plummer equation

Correct Answer: B. Kozeny – Karman equation ✔

Option A: Friction factor

Option B: Static pressure

Option C: Dynamic pressure

Option D: None of these

Correct Answer: Static pressure ✔

Option A: ∝ Q

Option B: ∝ √Q

Option C: ∝ Q2

Option D: Constant

Correct Answer: Constant ✔

Option A: Bingham plastic

Option B: Pseudo-plastic

Option C: Newtonian liquid

Option D: Dilatent

Correct Answer: Dilatent ✔

Option A: V1.8

Option B: V-0.8

Option C: V

Option D: V-1

Correct Answer: V1.8 ✔

Option A: The length of entrance region of pipe, in which full development of fluid flow takes place

Option B: Transition length for laminar flow of Newtonian fluids in a pipe of diameter ‘d’ is equal to

Option C: Transition length for turbulent flow of Newtonian fluids in a smooth pipe of diameter ‘d’ is

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

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

Option A: Archimedes principle

Option B: Newton’s second law of motion

Option C: Hooke’s law

Option D: Newton’s third law of motion

Correct Answer: C. Hooke’s law ✔

Option A: Pitot tube

Option B: Rotameter

Option C: Segmental orificemeter

Option D: Hot wire anemometer

Correct Answer: Hot wire anemometer ✔

Option A: An elementary wave in an open channel

Option B: Flow in an open channel

Option C: A disturbance travelling upstream in moving fluid

Option D: None of these

Correct Answer: An elementary wave in an open channel ✔

Option A: 5

Option B: 14.1

Option C: 56.22

Option D: 28.2

Correct Answer: 28.2 ✔

Option A: pv = constant

Option B: pvr= constant

Option C: pvr = constant, and process is reversible

Option D: None of these

Correct Answer: pvr = constant, and process is reversible ✔

Option A: 64/Re

Option B: 32μLV/gc.D2

Option C: 4f (L/D) (v2/2gc). ρ

Option D: f (L/D) (v2/2gc). ρ

Correct Answer: 4f (L/D) (v2/2gc). ρ ✔

Option A: Decreases

Option B: Increases linearly

Option C: Increases exponentially

Option D: Remain constant

Correct Answer: Increases linearly ✔

Option A: Orificemeter

Option B: Venturimeter

Option C: Flow nozzle

Option D: All of them incur the same head loss

Correct Answer: Orificemeter ✔

Option A: Square of the radial distance

Option B: Radial distance linearly

Option C: Inverse of the radial distance

Option D: Elevation along vertical direction

Correct Answer: Square of the radial distance ✔

Option A: Temperature gradients are very high

Option B: Temperature is more or less uniform

Option C: Hot spots are formed

Option D: Segregation of the solids occurs

Correct Answer: Temperature is more or less uniform ✔

Option A: Rotation

Option B: Translation

Option C: Linear deformation

Option D: Angular deformation

Correct Answer: Angular deformation ✔

Option A: Fluid to that of the light

Option B: Light to that of the fluid

Option C: Fluid to that of the sound

Option D: Sound to that of the fluid

Correct Answer: Fluid to that of the sound ✔

Option A: Specific gravity & temperature of the liquid

Option B: Leakage & pressure decreasing at higher elevations

Option C: Frictional resistance through pipes, fittings & passages

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

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

Option A: Axial flow

Option B: Centrifugal

Option C: Mixed flow

Option D: None of these

Correct Answer: Centrifugal ✔

Option A: Reduce discharge fluctuation

Option B: Reduce the danger of cavitation

Option C: Avoid the necessity of priming

Option D: Increase the pump efficiency

Correct Answer: Reduce discharge fluctuation ✔

Option A: Provides back pressure for a cylinder

Option B: Unloads a pump

Option C: Is a directional control valve

Option D: None of these

Correct Answer: Is a directional control valve ✔

Option A: N2D3

Option B: ND2

Option C: N2D

Option D: N3D5

Correct Answer: N3D5 ✔

Option A: Fluid on the solid in a direction opposite to flow

Option B: Fluid on the solid in the direction of flow

Option C: Solid on the fluid

Option D: None of these

Correct Answer: Fluid on the solid in the direction of flow ✔

Option A: gm/cm2. sec

Option B: gm/cm. sec

Option C: cm2/sec

Option D: m2/sec

Correct Answer: gm/cm. sec ✔

Option A: Decrease

Option B: Increase

Option C: Remain same

Option D: Unpredictable

Correct Answer: Decrease ✔

Option A: Conversion of kinetic head to pressure head is facilitated

Option B: Conversion of pressure head to kinetic head is facilitated

Option C: Power transmitted through the nozzle is maximum, when the head lost due to friction in the

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: Reciprocating compressor

Option B: Blower

Option C: Axial flow compressor

Option D: Centrifugal compressor

Correct Answer: Blower ✔

Option A: Weber

Option B: Mach

Option C: Froude

Option D: Reynold

Correct Answer: Reynold ✔

Option A: Linearly as the viscosity

Option B: Inversely as the pressure drop

Option C: Inversely as the viscosity

Option D: As the square of the radius

Correct Answer: Inversely as the viscosity ✔

Option A: Not a function of the roughness of pipe wall

Option B: Inversely proportional to Reynolds number

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: A storage device and a control valve

Option B: A cylinder and a plunger

Option C: Two pistons and two cylinders

Option D: A storage tank and a ram pump

Correct Answer: A cylinder and a plunger ✔

Option A: Decreasing the size of the inlet pipe

Option B: Increasing the size of the inlet pipe

Option C: Lowering the pump position

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: Froude

Option B: Euler

Option C: Reynold

Option D: Mach

Correct Answer: Euler ✔

Option A: Mean flow velocity is about 0.5 times the maximum velocity

Option B: Velocity profile becomes flatter and flatter with increasing Reynolds number

Option C: Point of maximum instability exists at a distance of 2r/3 from the pipe wall (r = pipe radius)

Option D: Skin friction drag, shear stresses, random orientation of fluid particles and slope of velocity

Correct Answer: D. Skin friction drag, shear stresses, random orientation of fluid particles and slope of velocity
profile at the wall are more ✔

Option A: 0.1

Option B: 0.55

Option C: 0.95

Option D: 1.85

Correct Answer: 0.95 ✔

Option A: Gravitational & buoyant

Option B: Centrifugal & drag

Option C: Gravitational or centrifugal buoyant drag

Option D: External, drag & viscous

Correct Answer: Gravitational or centrifugal buoyant drag ✔

Option A: Rate of transfer of molecular momentum

Option B: Cohesion

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: Df + Bf = Wf

Option B: Df = Bf + Wf

Option C: Df + Bf + Wf =0

Option D: None of these

Correct Answer: Df + Bf = Wf ✔

Option A: Nikuradse

Option B: Von-Karman

Option C: Blasius

Option D: Colebrook

Correct Answer: Nikuradse ✔

Option A: Incompressible

Option B: Non-viscous

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: Irrotational and frictionless flow

Option B: Irrotational and frictional flow

Option C: One in which dissipation of mechanical energy into heat occurs

Option D: Formation of eddies within the stream

Correct Answer: Irrotational and frictionless flow ✔

Option A: 1 × 10-3 to 2 × 10-3 kg/m.s

Option B: 0.5 × 10-3 to 1 × 10-3 kg/m.s

Option C: 1 to 2 kg/m.s

Option D: 0.5 to 1 kg/m.s

Correct Answer: 0.5 × 10-3 to 1 × 10-3 kg/m.s ✔

Option A: Applicable to laminar flow problems

Option B: A universal constant

Option C: Zero at the pipe wall

Option D: None of these

Correct Answer: Zero at the pipe wall ✔

Option A: Viscous

Option B: Inertial

Option C: Gravity

Option D: Surface tension

Correct Answer: Viscous ✔

Option A: Due to the motion of conducting fluid through an externally generated uniform field

Option B: Proportional to the fluid velocity

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: Rubber latex

Option B: Sewage sludge

Option C: Quicksand

Option D: Non-colloidal solution

Correct Answer: Non-colloidal solution ✔

Option A: Stream line body

Option B: Two dimensional body

Option C: Bluff body

Option D: None of these

Correct Answer: Bluff body ✔

Option A: Less than

Option B: Greater than

Option C: Same as

Option D: None of these

Correct Answer: Greater than ✔

Option A: Decreases due to reduced viscosity

Option B: Decreases due to reduced vapour pressure

Option C: Increases due to increased vapour pressure

Option D: Decreases due to increased frictional resistance

Correct Answer: Decreases due to reduced vapour pressure ✔

Option A: Less than atmospheric pressure

Option B: More than liquid vapor pressure

Option C: Less than liquid vapor pressure

Option D: More than atmospheric pressure

Correct Answer: Less than liquid vapor pressure ✔

Option A: Electromagnetic pump

Option B: Centrifugal pump

Option C: Reciprocating pump

Option D: Gear pump

Correct Answer: Reciprocating pump ✔

Option A: Discharge of water by a centrifugal pump being run at a constant rpm

Option B: Water flow in the suction and discharge pipe of a reciprocating pump

Option C: Water discharge from a vertical vessel in which constant level is maintained

Option D: Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe

Correct Answer: Water flow in the suction and discharge pipe of a reciprocating pump ✔

Option A: Affected by the fluid flow pressure

Option B: Constant

Option C: Affected by the presence of a solid boundary

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

Correct Answer: Affected by the presence of a solid boundary ✔

Option A: 1

Option B: 0

Option C: < 1

Option D: > 1

Correct Answer: 1 ✔

Option A: 0.003

Option B: 0.01

Option C: 0.1

Option D: 0.3

Correct Answer: 0.003 ✔

Option A: Rough and smooth pipes have the same friction factor

Option B: Laminar film covers the roughness projections

Option C: Friction factor depends upon NRe only

Option D: Friction factor is independent of the relative roughness

Correct Answer: Friction factor is independent of the relative roughness ✔

Option A: 2000

Option B: 10

Option C: 100

Option D: 1000

Correct Answer: 10 ✔

Option A: Dependent on Reynolds number

Option B: Independent of Reynolds number

Option C: Dependent on the length of the pipe

Option D: None of these

Correct Answer: Dependent on Reynolds number ✔

Option A: Incompressible, frictionless, steady, along a streamline

Option B: Uniform, steady, incompressible, along a streamline

Option C: Steady, density being pressure dependent, frictionless

Option D: None of these

Correct Answer: Incompressible, frictionless, steady, along a streamline ✔

Option A: Booster service

Option B: Pumping liquid fertilisers (e.g. liquid NH3)

Option C: Pumping industrial wastes

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

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