For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is _______________?

More or less, depending on the type of particle

For flow of fluids through packed bed, the superficial velocity is_________________?

More than the average velocity through channels

Less than the average velocity through channels

More than the average velocity through channels

Dependent on the pressure drop across the bed

Same as the average velocity through channels

For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary_______________?

Directly as square root of gas density

Directly as square of gas density

Directly as square root of gas density

For a reciprocating pump, the indicator diagram is the graph between the________________?

Angle swept by the crank pin at any instant and the discharge

Discharge and overall efficiency

Volume swept by piston for one complete revolution and the pressure in the cylinder

Angle swept by the crank pin at any instant and the discharge

For a given Reynolds number, in a hydraulically smooth pipe, further smoothening ____________ the friction factor?

Brings about no further reduction of

For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively)?

Either A. or B.; depends on other factors

For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the___________________?

Elevation along vertical direction

Foot valves are provided in the suction line of a centrifugal pump to ____________________?

Remove the contaminant present in the liquid

Avoid priming, every time we start the pump

Remove the contaminant present in the liquid

Minimise the fluctuation in discharge

Fluidised beds are formed, when the__________________?

Pressure forces equal gravity forces

Gravity force is less than the fluid friction

Pressure forces equal gravity forces

Sum of the fluid friction and pressure forces is equal and opposite to gravity forces

Fluid resistance to shear depends upon its_______________?

Rate of transfer of molecular momentum

Fanning friction factor for laminar flow of fluid in a circular pipe is____________________?

Not a function of the roughness of pipe wall

Inversely proportional to Reynolds number

f = 16/NRe, is valid for__________________?

Laminar flow through an open channel

Euler’s equation of motion states, that at every point, the_________________?

Rate of mass outflow is equal to the rate of mass inflow

Force per unit mass equals acceleration

Rate of mass outflow is equal to the rate of mass inflow

Euler’s equation of motion is a statement expressing____________________?

Newton’s second law of motion

Erosion and pits formation on the impeller of a centrifugal pump may be due to________________?

Its operation with delivery valve closed for considerable time after starting the pump

Off centering of pump with motor

Equivalent length of a pipe fitting is____________________?

Dependent on the length of the pipe

659 + Mcqs in Fluid Mechanics for Chemical in Chemical Engineering Page 10 McqOptions

451.	For one dimensional flow of an incompressible fluid in unsteady state in x-direction, the continuity equation is given by_______________?
A.	∂u/∂x = 0
B.	∂(ρu)/∂x = 0
C.	(∂u/∂x) = – (∂ρ/∂t)
D.	∂ρ/∂t = 0
Answer» B. ∂(ρu)/∂x = 0

Discussion

452.	For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is _______________?
A.	More
B.	Less
C.	Equal
D.	More or less, depending on the type of particle
Answer» B. Less

Discussion

453.	For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is________________?
A.	More
B.	Less
C.	Equal
D.	Independent of porosity
Answer» C. Equal

Discussion

454.	For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter) ?
A.	Vs/Dp2
B.	Vs2/Dp2
C.	Vs2/Dp3
D.	Vs/Dp3
Answer» B. Vs2/Dp2

Discussion

455.	For laminar flow through a closed conduit____________________?
A.	Vmax = 2Vav
B.	Vmax = Vav
C.	Vmax = 1.5Vav
D.	Vmax = 0.5Vav
Answer» B. Vmax = Vav

Discussion

456.	For laminar flow of Newtonian fluid in a circular pipe, the velocity distribution is a function of the distance ‘d’ measured from the centre line of the pipe, and it follows a ______________ relationship?
A.	Logarithmic
B.	Parabolic
C.	Hyperbolic
D.	Linear
Answer» C. Hyperbolic

Discussion

457.	For laminar flow of Newtonian fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to (where, μ = fluid viscosity ) ?
A.	μ
B.	1/μ
C.	√μ
D.	1/√μ
Answer» C. √μ

Discussion

458.	For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of_________________?
A.	2
B.	<2
C.	>2
D.	1/2
Answer» B. <2

Discussion

459.	For laminar flow of a fluid through a packed bed of spheres of diameter d, the pressure drop per unit length of bed depends upon the sphere diameter as_________________?
A.	d
B.	d2
C.	d4
D.	d̅ 2
Answer» E.

Discussion

460.	For ideally incompressible fluid, the Mach number will be __________________?
A.	1.5
B.	1
C.	0
D.	5
Answer» C. 0

Discussion

461.	For flow through a venturi at a particular discharge, the correct relationships among velocities at point X, Y and Z would be __________________?
A.	V1 < V2 < V3
B.	V2 > V1 and V2 > V3
C.	V1 > V2 > V3
D.	None of these
Answer» C. V1 > V2 > V3

Discussion

462.	For flow through an orifice from a reservoir, the actual velocity at the vena contracta is given by _________________?
A.	√(2gh)
B.	C.V. √(2gh)
C.	Cd √(2gh)
D.	Cc √(2gh)
Answer» C. Cd √(2gh)

Discussion

463.	For flow through a venturi at a particular discharge, the correct relationships among heads at points X, Y, and Z are__________________?
A.	h1 > h2 < h3
B.	h1 > h2 > h3
C.	h2 < h1 < h3
D.	h1 < h2 < h3
Answer» B. h1 > h2 > h3

Discussion

464.	For flow past a flat plate, if „x‟ is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to________________?
A.	√x
B.	1/√x
C.	x
D.	1/x
Answer» B. 1/√x

Discussion

465.	For flow of fluids through packed bed, the superficial velocity is_________________?
A.	Less than the average velocity through channels
B.	More than the average velocity through channels
C.	Dependent on the pressure drop across the bed
D.	Same as the average velocity through channels
Answer» B. More than the average velocity through channels

Discussion

466.	For an unstable equilibrium of a floating body (where, M = metacentre.) ?
A.	M is above G
B.	M is below G
C.	M & G coincide
D.	None of these
Answer» C. M & G coincide

Discussion

467.	For an incompressible fluid, the bulk modulus of elasticity is____________________?
A.	5 kg/m3
B.	∞ N/m2
C.	1 N
D.	0 N/m
Answer» C. 1 N

Discussion

468.	For an ideal fluid flow, Reynolds number is___________________?
A.	2100
B.	100
C.	0
D.	∞
Answer» E.

Discussion

469.	For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively) ?
A.	G is above B
B.	B is above G
C.	B & G coincide
D.	None of these
Answer» C. B & G coincide

Discussion

470.	For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary_______________?
A.	Directly as square of gas density
B.	Directly as gas density
C.	Directly as square root of gas density
D.	Inversely as gas density
Answer» C. Directly as square root of gas density

Discussion

471.	For a reciprocating pump, the indicator diagram is the graph between the________________?
A.	Discharge and overall efficiency
B.	Volume swept by piston for one complete revolution and the pressure in the cylinder
C.	Angle swept by the crank pin at any instant and the discharge
D.	None of these
Answer» C. Angle swept by the crank pin at any instant and the discharge

Discussion

472.	For a given Reynolds number, in a hydraulically smooth pipe, further smoothening ____________ the friction factor?
A.	Brings about no further reduction of
B.	Increases
C.	Decreases
D.	None of these
Answer» B. Increases

Discussion

473.	For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively)?
A.	Increase
B.	Decrease
C.	Remain constant
D.	Either A. or B.; depends on other factors
Answer» B. Decrease

Discussion

474.	For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the___________________?
A.	Square of the radial distance
B.	Radial distance linearly
C.	Inverse of the radial distance
D.	Elevation along vertical direction
Answer» B. Radial distance linearly

Discussion

475.	Foot valves are provided in the suction line of a centrifugal pump to ____________________?
A.	Avoid priming, every time we start the pump
B.	Remove the contaminant present in the liquid
C.	Minimise the fluctuation in discharge
D.	Control the liquid discharge
Answer» B. Remove the contaminant present in the liquid

Discussion

476.	Foot valves provided in pumps are ____________ valves?
A.	Relief
B.	Three/four way
C.	Pressure reducing
D.	Directional control
Answer» E.

Discussion

477.	Foot valve provided in the pump is a ______________ valve?
A.	Direction control
B.	Back pressure
C.	Relief
D.	Pressure reduction
Answer» C. Relief

Discussion

478.	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
Answer» C. Pressure forces equal gravity forces

Discussion

479.	Fluid resistance to shear depends upon its_______________?
A.	Rate of transfer of molecular momentum
B.	Cohesion
C.	Both A. and B.
D.	Neither A. nor B.
Answer» D. Neither A. nor B.

Discussion

480.	Fluid flow in a/an ______________ is an example of pressure flow?
A.	Partially filled pipeline
B.	Pipe
C.	Open channel
D.	River
Answer» C. Open channel

Discussion

481.	Fluid flow through a packed bed is represented by the ______________ equation?
A.	Fanning’s
B.	Ergun’s
C.	Hagen-Poiseuille’s
D.	None of these
Answer» C. Hagen-Poiseuille’s

Discussion

482.	Fluid flow at increasing rate through a diverging pipe is an example of ______________ flow?
A.	Steady uniform
B.	Non-steady uniform
C.	Steady non-uniform
D.	Non-steady non-uniform
Answer» E.

Discussion

483.	Flow measurement in an open channel is done by a/an ________________?
A.	Venturimeter
B.	Orificemeter
C.	Weir
D.	Rotameter
Answer» D. Rotameter

Discussion

484.	Flow rate of high velocity flue gas discharged through a stack to the atmosphere can be most conveniently measured by a _________________?
A.	Pitot tube
B.	Manometer
C.	Rotameter
D.	None of these
Answer» B. Manometer

Discussion

485.	____________ flow means the flow of incompressible fluid with no shear ?
A.	Potential
B.	Streamline
C.	Creep
D.	Boundary layer
Answer» B. Streamline

Discussion

486.	Fanning friction factor is equal to (where, fB = Blasius friction factor) ?
A.	fB/4
B.	fB/2
C.	4fB
D.	2fB
Answer» B. fB/2

Discussion

487.	Fanning friction factor equation applies to the _____________ fluid flow?
A.	Non-isothermal condition of
B.	Compressible
C.	Both A. and B.
D.	Neither A. nor B.
Answer» E.

Discussion

488.	Fanning friction factor for laminar flow of fluid in a circular pipe is____________________?
A.	Not a function of the roughness of pipe wall
B.	Inversely proportional to Reynolds number
C.	Both A. & B.
D.	Neither A. nor B.
Answer» D. Neither A. nor B.

Discussion

489.	Fanning equation is given by (ΔP/ρ) = 4f (L/D) (v2/2gc). It is applicable to _____________ region flow?
A.	Transition
B.	Laminar
C.	Turbulent
D.	Both B. and C.
Answer» E.

Discussion

490.	f = 16/NRe, is valid for__________________?
A.	Turbulent flow
B.	Laminar flow through an open channel
C.	Steady flow
D.	None of these
Answer» E.

Discussion

491.	Experimental study of laminar fluid flow through a circular tube was conducted by____________________?
A.	Reynolds
B.	Hagen and Poiseuille
C.	Pascal
D.	Blake-Plummer
Answer» C. Pascal

Discussion

492.	Existence of boundary layer in fluid flow is because of the_________________?
A.	Surface tension
B.	Fluid density
C.	Fluid viscosity
D.	Gravity forces
Answer» D. Gravity forces

Discussion

493.	Euler’s equation of motion states, that at every point, the_________________?
A.	Fluid momentum is constant
B.	Force per unit mass equals acceleration
C.	Rate of mass outflow is equal to the rate of mass inflow
D.	None of these
Answer» C. Rate of mass outflow is equal to the rate of mass inflow

Discussion

494.	Euler’s equation of motion is a statement expressing____________________?
A.	Conservation of mass
B.	Conservation of energy
C.	Newton’s first law of motion
D.	Newton’s second law of motion
Answer» B. Conservation of energy

Discussion

495.	Erosion and pits formation on the impeller of a centrifugal pump may be due to________________?
A.	Cavitation
B.	Low speed of impeller
C.	Its operation with delivery valve closed for considerable time after starting the pump
D.	Off centering of pump with motor
Answer» B. Low speed of impeller

Discussion

496.	Equivalent length of a pipe fitting is____________________?
A.	Dependent on Reynolds number
B.	Independent of Reynolds number
C.	Dependent on the length of the pipe
D.	None of these
Answer» B. Independent of Reynolds number

Discussion

497.	Enamels and paints are generally _______________ fluid?
A.	Rheopectic
B.	Pseudo-plastic
C.	Thixotropic
D.	Dilatant
Answer» C. Thixotropic

Discussion

498.	Efficiency of power transmission (ε) through a circular pipe is given by (ht – hf)/ht, which has a maximum value of _____________ percent?
A.	33:3
B.	50
C.	66.6
D.	88.8
Answer» D. 88.8

Discussion

499.	Each term in Bernoulli‟s equation represents the _____________ of the fluid?
A.	Energy per unit mass
B.	Energy per unit weight
C.	Force per unit mass
D.	None of these
Answer» C. Force per unit mass

Discussion

500.	Each term of the Bernoulli’s equation written in the form, (p/ρ) + (g/gc). Z + (v2/2gc) = constant, represents the total energy per unit ________________?
A.	Mass
B.	Volume
C.	Specific weight
D.	None of these
Answer» B. Volume

Discussion

Explore topic-wise MCQs in Chemical Engineering.

For one dimensional flow of an incompressible fluid in unsteady state in x-direction, the continuity equation is given by_______________?

For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is _______________?

For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is________________?

For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter) ?

For laminar flow through a closed conduit____________________?

For laminar flow of Newtonian fluid in a circular pipe, the velocity distribution is a function of the distance ‘d’ measured from the centre line of the pipe, and it follows a ______________ relationship?

For laminar flow of Newtonian fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to (where, μ = fluid viscosity ) ?

For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of_________________?

For laminar flow of a fluid through a packed bed of spheres of diameter d, the pressure drop per unit length of bed depends upon the sphere diameter as_________________?

For ideally incompressible fluid, the Mach number will be __________________?

For flow through a venturi at a particular discharge, the correct relationships among velocities at point X, Y and Z would be __________________?

For flow through an orifice from a reservoir, the actual velocity at the vena contracta is given by _________________?

For flow through a venturi at a particular discharge, the correct relationships among heads at points X, Y, and Z are__________________?

For flow past a flat plate, if „x‟ is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to________________?

For flow of fluids through packed bed, the superficial velocity is_________________?

For an unstable equilibrium of a floating body (where, M = metacentre.) ?

For an incompressible fluid, the bulk modulus of elasticity is____________________?

For an ideal fluid flow, Reynolds number is___________________?

For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively) ?

For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary_______________?

For a reciprocating pump, the indicator diagram is the graph between the________________?

For a given Reynolds number, in a hydraulically smooth pipe, further smoothening ____________ the friction factor?

For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively)?

For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the___________________?

Foot valves are provided in the suction line of a centrifugal pump to ____________________?

Foot valves provided in pumps are ____________ valves?

Foot valve provided in the pump is a ______________ valve?

Fluidised beds are formed, when the__________________?

Fluid resistance to shear depends upon its_______________?

Fluid flow in a/an ______________ is an example of pressure flow?

Fluid flow through a packed bed is represented by the ______________ equation?

Fluid flow at increasing rate through a diverging pipe is an example of ______________ flow?

Flow measurement in an open channel is done by a/an ________________?

Flow rate of high velocity flue gas discharged through a stack to the atmosphere can be most conveniently measured by a _________________?

____________ flow means the flow of incompressible fluid with no shear ?

Fanning friction factor is equal to (where, fB = Blasius friction factor) ?

Fanning friction factor equation applies to the _____________ fluid flow?

Fanning friction factor for laminar flow of fluid in a circular pipe is____________________?

Fanning equation is given by (ΔP/ρ) = 4f (L/D) (v2/2gc). It is applicable to _____________ region flow?

f = 16/NRe, is valid for__________________?

Experimental study of laminar fluid flow through a circular tube was conducted by____________________?

Existence of boundary layer in fluid flow is because of the_________________?

Euler’s equation of motion states, that at every point, the_________________?

Euler’s equation of motion is a statement expressing____________________?

Erosion and pits formation on the impeller of a centrifugal pump may be due to________________?

Equivalent length of a pipe fitting is____________________?

Enamels and paints are generally _______________ fluid?

Efficiency of power transmission (ε) through a circular pipe is given by (ht – hf)/ht, which has a maximum value of _____________ percent?

Each term in Bernoulli‟s equation represents the _____________ of the fluid?

Each term of the Bernoulli’s equation written in the form, (p/ρ) + (g/gc). Z + (v2/2gc) = constant, represents the total energy per unit ________________?