Power loss in an orificemeter is __________ that in a venturimeter.

data insufficient, cannot be predicted

Which of the following is an undesirable property of a manometric liquid ?

Low viscosity & surface tension.

Non-sticky & non-corrosive nature.

Low viscosity & surface tension.

Low co-efficient of thermal expansion.

Which of the following is not an advantage of fluidisation from transfer operation point of view?

Minimisation of temperature variation.

Intimate contact of the fluid with all parts of the solid particles.

Lower fluid pumping power requirement.

Minimisation of temperature variation.

Prevention of particle seggregation.

Capacity of a hydraulic accumulator is defined in terms of maximum

volume available in the cylinder.

Froude number is the ratio of

shear stress to gravitational stress.

inertial stress to shear stress.

inertial stress to gravitational stress.

In frictional fluid flow, the quantity, , is

increased in the direction of flow.

not constant along a streamline.

increased in the direction of flow.

Bernoulli's equation accounts for the

different forms of mechanical energy

The blades of a centrifugal impeller are said to be curved forward, if the __________ of the motion of impeller blades.

inlet tip of a blade curves in a direction opposite to that

outlet tip of a blade curves in a direction opposite to that

inlet tip of a blade is towards the direction

outlet tip of a blade is towards the direction

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

inverse of the radial distance.

elevation along vertical direction.

The energy equation, (E = internal energy/mass), is applicable to

adiabatic unsteady flow of gases.

In fluid flow, cavitation is caused, if the

fluid velocity decreases to zero.

flow pressure approaches its vapor pressure at the prevailing temperature.

Mass velocity is independent of temperature & pressure, when the flow is

unsteady and the cross-section is changed.

unsteady through unchanged cross-section.

steady through changing cross-section.

steady and the cross-section is unchanged.

unsteady and the cross-section is changed.

When a fluid flows over a solid surface, the

resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves.

velocity is uniform at any cross-section.

velocity gradient is zero at the solid surface.

resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves.

velocity is not zero at the solid surface.

Velocity distribution for flow between two fixed parallel plates

is constant over the entire cross-section.

varies parabolically across the section.

is constant over the entire cross-section.

is zero at the plates and increases linearly to the midplane.

Prandtl mixing length is

applicable to laminar flow problems.

Hydraulic intensifier is used for increasing the

momentum rate through delivery pipe.

rate of velocity of liquid supply.

rate of flow through delivery pipeline of a pump.

intensity of pressure of the liquid.

momentum rate through delivery pipe.

Power number is the ratio of

inertial stress to drag stress.

drag stress to inertial stress.

inertial stress to drag stress.

inertial stress to gravitational stress.

gravitational stress to drag stress.

Major loss in sudden contraction in pipe flow is due to

expansion of flow after sudden contraction.

1608 + Mcqs in Fluid Mechanics in Chemical Engineering Page 29 McqOptions

1401.	What causes cavitation in centrifugal pump ?
A.	High suction pressure
B.	Low barometric pressure
C.	Low suction pressure
D.	High suction velocity
Answer» D. High suction velocity

Discussion

1402.	Power loss in an orificemeter is __________ that in a venturimeter.
A.	less than
B.	same as
C.	more than
D.	data insufficient, cannot be predicted
Answer» D. data insufficient, cannot be predicted

Discussion

1403.	The dimension of dynamic viscosity is
A.	ML-1T-1
B.	L2T-1
C.	LT-2
D.	ML-1T-2
Answer» B. L2T-1

Discussion

1404.	Which of the following is an undesirable property of a manometric liquid ?
A.	Non-sticky & non-corrosive nature.
B.	High vapour pressure.
C.	Low viscosity & surface tension.
D.	Low co-efficient of thermal expansion.
Answer» C. Low viscosity & surface tension.

Discussion

1405.	Which of the following is a Newtonian fluid?
A.	Rubber latex
B.	Sewage sludge
C.	Quicksand
D.	Non-colloidal solution
Answer» E.

Discussion

1406.	A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m3/s? The Fanning friction factor, f is 0.0062.
A.	10 m
B.	11 m
C.	12 m
D.	20 m
Answer» C. 12 m

Discussion

1407.	Which of the following is not an advantage of fluidisation from transfer operation point of view?
A.	Intimate contact of the fluid with all parts of the solid particles.
B.	Lower fluid pumping power requirement.
C.	Minimisation of temperature variation.
D.	Prevention of particle seggregation.
Answer» C. Minimisation of temperature variation.

Discussion

1408.	Pressure drop in packed bed for turbulent flow is given by the __________ equation.
A.	Kozney-Karman
B.	Blake-Plummer
C.	Leva's
D.	Hagen-Poiseulle's
Answer» C. Leva's

Discussion

1409.	Capacity of a hydraulic accumulator is defined in terms of maximum
A.	amount of energy stored.
B.	flow rate through accumulator.
C.	rate of falling of ram.
D.	volume available in the cylinder.
Answer» B. flow rate through accumulator.

Discussion

1410.	The flow of a liquid through tapering pipe at a constant rate is an example of __________ flow.
A.	steady uniform
B.	steady non uniform
C.	unsteady uniform
D.	unsteady non uniform
Answer» C. unsteady uniform

Discussion

1411.	Which of the following is most prone to pulsating discharge flow ?
A.	Centrifugal pump
B.	Reciprocating pump
C.	Gear pump
D.	Axial flow pump
Answer» D. Axial flow pump

Discussion

1412.	Froude number is the ratio of
A.	shear stress to gravitational stress.
B.	drag stress to shear stress.
C.	inertial stress to shear stress.
D.	inertial stress to gravitational stress.
Answer» E.

Discussion

1413.	In frictional fluid flow, the quantity, , is
A.	constant along a streamline.
B.	not constant along a streamline.
C.	increased in the direction of flow.
D.	none of these.
Answer» C. increased in the direction of flow.

Discussion

1414.	Bernoulli's equation accounts for the
A.	various momentums
B.	various masses
C.	different forms of mechanical energy
D.	none of these
Answer» D. none of these

Discussion

1415.	The blades of a centrifugal impeller are said to be curved forward, if the __________ of the motion of impeller blades.
A.	inlet tip of a blade curves in a direction opposite to that
B.	outlet tip of a blade curves in a direction opposite to that
C.	inlet tip of a blade is towards the direction
D.	outlet tip of a blade is towards the direction
Answer» E.

Discussion

1416.	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

1417.	Non-colloidal solution is an example of the __________ fluid.
A.	non-Newtonion
B.	Newtonion
C.	dilatent
D.	pseudoplastic
Answer» C. dilatent

Discussion

1418.	The energy equation, (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.
Answer» E.

Discussion

1419.	The Mach number for hypersonic flow of compressible fluid is
A.	1
B.	> 1
C.	> 4
D.	< 2
Answer» D. < 2

Discussion

1420.	The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is
A.	0.3
B.	0.9
C.	0.03
D.	0.66
Answer» B. 0.9

Discussion

1421.	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

1422.	In fluid flow, cavitation is caused, if the
A.	fluid velocity decreases to zero.
B.	total energy decreases.
C.	both (a) and (b).
D.	flow pressure approaches its vapor pressure at the prevailing temperature.
Answer» E.

Discussion

1423.	Viscosity of water is about __________ times that of air at room temperature.
A.	15
B.	55
C.	155
D.	1050
Answer» C. 155

Discussion

1424.	Quicksand is an example of a __________ fluid.
A.	bingham plastic
B.	dilatent
C.	Newtonion
D.	pseudoplastic
Answer» C. Newtonion

Discussion

1425.	The terminal velocity of a particle moving through a fluid varies as dpn. What is the value of n' for Newton's law regime ?
A.	0.5
B.	1
C.	1.5
D.	3
Answer» B. 1

Discussion

1426.	Air vessel of a reciprocating pump is initially filled with
A.	atmospheric air
B.	compressed air
C.	water
D.	none of these
Answer» C. water

Discussion

1427.	Mass velocity is independent of temperature & pressure, when the flow is
A.	unsteady through unchanged cross-section.
B.	steady through changing cross-section.
C.	steady and the cross-section is unchanged.
D.	unsteady and the cross-section is changed.
Answer» D. unsteady and the cross-section is changed.

Discussion

1428.	An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonion fluid beyond yield stress. Which of the following is an ideal plastic ?
A.	Sewage sludge
B.	Rubber latex
C.	Blood
D.	Sugar solution
Answer» B. Rubber latex

Discussion

1429.	When a fluid flows over a solid surface, the
A.	velocity is uniform at any cross-section.
B.	velocity gradient is zero at the solid surface.
C.	resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves.
D.	velocity is not zero at the solid surface.
Answer» C. resistance between the surface & the fluid is lesser as compared to that between the fluid layers themselves.

Discussion

1430.	Velocity distribution for flow between two fixed parallel plates
A.	varies parabolically across the section.
B.	is constant over the entire cross-section.
C.	is zero at the plates and increases linearly to the midplane.
D.	none of these.
Answer» B. is constant over the entire cross-section.

Discussion

1431.	The pitot static tube does not measure the __________ pressure.
A.	static
B.	total
C.	difference in static & dynamic
D.	all (a), (b) and (c)
Answer» E.

Discussion

1432.	A conical tank with a bottom opening of cross-sectional area A is filled with water and is mounted on supports as shown in the figure. What is the force F with which plate X must be pushed up to prevent water from leaking ? Assume that the density of air is negligible as compared to the density of water œÅL.$
A.	œÅL . Vg
B.	œÅL . A.Hg
C.	œÅL . Vg/2
D.	œÅL .Vg/3
Answer» C. œÅL . Vg/2

Discussion

1433.	The rate of change of moment of momentum represents the __________ by the fluid.
A.	torque applied
B.	force exerted
C.	work done
D.	power developed
Answer» B. force exerted

Discussion

1434.	The pressure head on sudden contraction in a horizontal pipe is converted into the __________ head.
A.	elevation
B.	velocity
C.	both (a) & (b)
D.	neither (a) nor (b)
Answer» C. both (a) & (b)

Discussion

1435.	Bernoulli's equation is not applicable, when the flow is
A.	irrotational.
B.	incompressible.
C.	viscous.
D.	all (a), (b) & (c).
Answer» E.

Discussion

1436.	Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newton's law of viscosity. (II) Newton's second law of motion. (III) The continuity equation. (IV) Velocity of boundary layer must be zero relative to boundary. (V) Fluid cannot penetrate a boundary.
A.	I, II, III
B.	II, III, V
C.	I, II, V
D.	II, IV, V
Answer» C. I, II, V

Discussion

1437.	The maximum discharge through a circular channel takes place, when the depth of the fluid flow is __________ times the pipe diameter.
A.	0.25
B.	0.5
C.	0.66
D.	0.95
Answer» E.

Discussion

1438.	Which of the following is the most common pump for pumping either raw sewage or sludge ?
A.	Electromagnetic pump
B.	Centrifugal pump
C.	Reciprocating pump
D.	Gear pump
Answer» D. Gear pump

Discussion

1439.	Prandtl mixing length is
A.	applicable to laminar flow problems.
B.	a universal constant.
C.	zero at the pipe wall.
D.	none of these.
Answer» D. none of these.

Discussion

1440.	In case of turbulent flow of a Newtonion fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)
A.	Vavg
B.	1.2 Vavg
C.	1.5 Vavg
D.	1.8 Vavg
Answer» C. 1.5 Vavg

Discussion

1441.	Hydraulic intensifier is used for increasing the
A.	rate of velocity of liquid supply.
B.	rate of flow through delivery pipeline of a pump.
C.	intensity of pressure of the liquid.
D.	momentum rate through delivery pipe.
Answer» D. momentum rate through delivery pipe.

Discussion

1442.	Permanent loss in a venturimeter is about __________ percent of the pressure drop in theupstream cone.
A.	1
B.	10 .
C.	40
D.	70
Answer» C. 40

Discussion

1443.	If Blausius or Darcey friction factor is 'f1' then the Fanning friction factor is equal to
A.	f1/4
B.	4f2
C.	2f1
D.	f1/2
Answer» B. 4f2

Discussion

1444.	Specific speed of a centrifugal pump depends upon the __________ head.
A.	suction
B.	delivery
C.	manometric
D.	none of these
Answer» E.

Discussion

1445.	Schedule number of a pipe, which is a measure of its wall thickness, is given by
A.	1000 P'/S
B.	100 P'/S
C.	1000 S/P'
D.	10000 P'/S
Answer» B. 100 P'/S

Discussion

1446.	Power number is the ratio of
A.	drag stress to inertial stress.
B.	inertial stress to drag stress.
C.	inertial stress to gravitational stress.
D.	gravitational stress to drag stress.
Answer» B. inertial stress to drag stress.

Discussion

1447.	The line traced by a single fluid particle as it moves over a period of time is called __________ line.
A.	stream
B.	path
C.	equipotential
D.	none of these
Answer» C. equipotential

Discussion

1448.	The resistance wire used in a hot wire anemometer for conducting electrical current is made of
A.	copper
B.	tungsten
C.	chromium
D.	aluminium
Answer» C. chromium

Discussion

1449.	The nominal size of a hose pipe is specified by its
A.	I.D.
B.	O.D.
C.	thickness
D.	none of these
Answer» B. O.D.

Discussion

1450.	Major loss in sudden contraction in pipe flow is due to
A.	boundary friction.
B.	flow contraction.
C.	expansion of flow after sudden contraction.
D.	none of these.
Answer» C. expansion of flow after sudden contraction.

Discussion

Explore topic-wise MCQs in Chemical Engineering.

What causes cavitation in centrifugal pump ?

Power loss in an orificemeter is __________ that in a venturimeter.

The dimension of dynamic viscosity is

Which of the following is an undesirable property of a manometric liquid ?

Which of the following is a Newtonian fluid?

Which of the following is not an advantage of fluidisation from transfer operation point of view?

Pressure drop in packed bed for turbulent flow is given by the __________ equation.

Capacity of a hydraulic accumulator is defined in terms of maximum

The flow of a liquid through tapering pipe at a constant rate is an example of __________ flow.

Which of the following is most prone to pulsating discharge flow ?

Froude number is the ratio of

In frictional fluid flow, the quantity, , is

Bernoulli's equation accounts for the

The blades of a centrifugal impeller are said to be curved forward, if the __________ of the motion of impeller blades.

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

Non-colloidal solution is an example of the __________ fluid.

The energy equation, (E = internal energy/mass), is applicable to

The Mach number for hypersonic flow of compressible fluid is

The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is

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

In fluid flow, cavitation is caused, if the

Viscosity of water is about __________ times that of air at room temperature.

Quicksand is an example of a __________ fluid.

The terminal velocity of a particle moving through a fluid varies as dpn. What is the value of n' for Newton's law regime ?

Air vessel of a reciprocating pump is initially filled with

Mass velocity is independent of temperature & pressure, when the flow is

An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonion fluid beyond yield stress. Which of the following is an ideal plastic ?

When a fluid flows over a solid surface, the

Velocity distribution for flow between two fixed parallel plates

The pitot static tube does not measure the __________ pressure.

The rate of change of moment of momentum represents the __________ by the fluid.

The pressure head on sudden contraction in a horizontal pipe is converted into the __________ head.

Bernoulli's equation is not applicable, when the flow is

Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newton's law of viscosity. (II) Newton's second law of motion. (III) The continuity equation. (IV) Velocity of boundary layer must be zero relative to boundary. (V) Fluid cannot penetrate a boundary.

The maximum discharge through a circular channel takes place, when the depth of the fluid flow is __________ times the pipe diameter.

Which of the following is the most common pump for pumping either raw sewage or sludge ?

Prandtl mixing length is

In case of turbulent flow of a Newtonion fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)

Hydraulic intensifier is used for increasing the

Permanent loss in a venturimeter is about __________ percent of the pressure drop in theupstream cone.

If Blausius or Darcey friction factor is 'f1' then the Fanning friction factor is equal to

Specific speed of a centrifugal pump depends upon the __________ head.

Schedule number of a pipe, which is a measure of its wall thickness, is given by

Power number is the ratio of

The line traced by a single fluid particle as it moves over a period of time is called __________ line.

The resistance wire used in a hot wire anemometer for conducting electrical current is made of

The nominal size of a hose pipe is specified by its

Major loss in sudden contraction in pipe flow is due to