*/*_The dimension of dynamic viscosity is?

L¬¨‚â§T‚Äö√Ö¬™¬¨œÄ

ML‚Äö√Ö¬™¬¨œÄT‚Äö√Ö¬™¬¨œÄ

L¬¨‚â§T‚Äö√Ö¬™¬¨œÄ

ML‚Äö√Ö¬™¬¨œÄT‚Äö√Ö¬™¬¨‚â§

*/*_Slugging in a fluidised bed can be avoided by using?

Shallow beds of solids and proper choice of particle size

Is a positive displacement pump

Is a non-positive displacement pump

Can be started with delivery valve closed

*/*_Froude number is not a factor?

For Reynolds number greater than 300

When there is no vortex formation

*/*_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

*/*_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??

Drag force and gravitational forces are important

Inertial and drag forces are important

Drag, gravitational and buoyancy forces are impportant

Drag force and gravitational forces are important

*/*_Drag force on the float of a rotameter is(where Q = flow rate of the )?

‚Äö√ √π‚Äö√ √∂Q

*/*_The terminal velocity of a small sphere settling in a viscous fluid varies as the?

Square of the difference in specific weights of solid & fluid

*/*_In continuous fluidisation?

The pressure drop is less than that for batch fluidisation

Solids are completely entrained

The pressure drop is less than that for batch fluidisation

There is no entrainment of solids

Velocity of the fluid is very small

*/*_Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will?

Data insufficient to predict pressure drop

*/*_In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of?

Friction co-efficient for flows at equal Reynold number

*/*_Volute type of casing is provided in a centrifugal pump to?

Convert velocity head to pressure head

Convert pressure head to velocity head

Reduce the discharge fluctuation

*/*_Multistage compressors are used in industry, because they?

Resemble closely to isothermal compression

*/*_Various efficiencies of a centrifugal pump are related as (where, ≈í‚àëm = mechanical efficiency ≈í‚àëv = volumetric efficiency. ≈í‚àëma = manometric efficiency ≈í‚àëo = overall efficiency)?

≈í‚àëma = ≈í‚àëm x ≈í‚àëv

≈í‚àëma x ≈í‚àëm x ≈í‚àëv = ≈í‚àëo

≈í‚àëm = ≈í‚àëv . ≈í‚àëma

≈í‚àëma = ≈í‚àëm x ≈í‚àëv

≈í‚àëv = ≈í‚àëm x ≈í‚àëma

*/*_At high Reynolds number?

Inertial forces control and viscous forces are unimportant

Inertial forces are unimportant and viscous forces control

*/*_Capacity of a rotary gear pump can be varied by?

Bypassing liquid from the suction or discharge line

*/*_Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have?

Higher capital &maintenance cost

1608 + Mcqs in Fluid Mechanics in Chemical Engineering Page 7 McqOptions

301.	*$_Which of the following is not dimension-less??
A.	Froude number
B.	Kinematic viscosity
C.	Pressure co-efficient
D.	None of these
Answer» C. Pressure co-efficient

Discussion

302.	/_Which is the most efficient and best for measuring very small flow rate of gases??
A.	Venturimeter
B.	Orifice meter
C.	Rotameter
D.	Flow nozzle
Answer» D. Flow nozzle

Discussion

303.	/_Pressure drop in a packed bed for laminar flow is given by the __________ equation.?
A.	Kozney-Karman
B.	Blake-Plummer
C.	Leva's
D.	Fanning friction factor
Answer» B. Blake-Plummer

Discussion

304.	/_The dimension of dynamic viscosity is?
A.	ML‚Äö√Ö¬™¬¨œÄT‚Äö√Ö¬™¬¨œÄ
B.	L¬¨‚â§T‚Äö√Ö¬™¬¨œÄ
C.	LT‚Äö√Ö¬™¬¨‚â§
D.	ML‚Äö√Ö¬™¬¨œÄT‚Äö√Ö¬™¬¨‚â§
Answer» B. L¬¨‚â§T‚Äö√Ö¬™¬¨œÄ

Discussion

305.	/_Slugging in a fluidised bed can be avoided by using?
A.	Tall narrow vessel
B.	Deep bed of solids
C.	Shallow beds of solids and proper choice of particle size
D.	Very large particles
Answer» D. Very large particles

Discussion

306.	/_With increasing flow rate, the hydraulic efficiency of a centrifugal pump?
A.	Monotonically decreases
B.	Decreases and then increases
C.	Remains constant
D.	Increases and then decreases
Answer» B. Decreases and then increases

Discussion

307.	/_A gas (density = 1.5 kg/m¬¨‚â• , viscosity = 2x 10‚Äö√Ö¬™‚Äö√Ö¬µ kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5kg/m¬¨‚â•and viscosity of 3 x 10‚Äö√Ö¬™‚Äö√Ö¬µkg/m.s flowing at 3 m/s will be?
A.	8400 Pa/m
B.	12600 Pa/m
C.	18900 Pa/m
D.	16800 Pa/m
Answer» C. 18900 Pa/m

Discussion

308.	/_Gear pump?
A.	Is a positive displacement pump
B.	Is a centrifugal pump
C.	Is a non-positive displacement pump
D.	Can be started with delivery valve closed
Answer» B. Is a centrifugal pump

Discussion

309.	/_What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition??
A.	0.5
B.	0.67
C.	1
D.	2
Answer» E.

Discussion

310.	/_Froude number is not a factor?
A.	For Reynolds number greater than 300
B.	When there is no vortex formation
C.	For unbaffled tank
D.	None of these
Answer» C. For unbaffled tank

Discussion

311.	/_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

312.	/_What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir??
A.	Penstock
B.	Siphon
C.	Tunnel
D.	Pressure pipeline
Answer» C. Tunnel

Discussion

313.	/_The valve used for very remote and accurate control of fluid is a __________ valve.?
A.	Needle
B.	Globe
C.	Gate
D.	Butterfly
Answer» B. Globe

Discussion

314.	/_Priming is needed in a __________ pump.?
A.	Reciprocating
B.	Gear
C.	Centrifugal
D.	Diaphragm
Answer» D. Diaphragm

Discussion

315.	/_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, gravitational and buoyancy forces are impportant
C.	Drag force and gravitational forces are important
D.	None of the above
Answer» C. Drag force and gravitational forces are important

Discussion

316.	/_The pressure head on sudden contraction in a horizontal pipe is converted into the __________ head.?
A.	Elevation
B.	Velocity
C.	Both A and B
D.	Neither A nor B
Answer» C. Both A and B

Discussion

317.	/_Drag force on the float of a rotameter is(where Q = flow rate of the )?
A.	‚Äö√ √πQ
B.	‚Äö√ √π‚Äö√ √∂Q
C.	‚Äö√ √πQ¬¨‚â§
D.	Constant
Answer» E.

Discussion

318.	/_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

319.	/_Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an?
A.	Pitot tube
B.	Venturimeter
C.	Orificemeter
D.	Rotameter
Answer» B. Venturimeter

Discussion

320.	/_Cavitation in a centrifugal pump results from?
A.	High discharge pressure
B.	Low barometric pressure
C.	High discharge velocity
D.	High discharge rate
Answer» C. High discharge velocity

Discussion

321.	/_The ratio of pressure forces to inertial forces is called the __________ number.?
A.	Froude
B.	Euler
C.	Reynold
D.	Mach
Answer» C. Reynold

Discussion

322.	/_A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an __________ fluid.?
A.	Newtonion
B.	Non-Newtonion
C.	Ideal
D.	Incompressible
Answer» B. Non-Newtonion

Discussion

323.	/_What is the value of Fanning friction factor f ' for smooth pipe at NRe = 10‚Äö√Ö‚àÇ approximately??
A.	0.003
B.	0.01
C.	0.1
D.	0.3
Answer» B. 0.01

Discussion

324.	/_The terminal velocity of a small sphere settling in a viscous fluid varies as the?
A.	First power of its dimeter
B.	Inverse of the fluid viscosity
C.	Inverse square of the diameter
D.	Square of the difference in specific weights of solid & fluid
Answer» C. Inverse square of the diameter

Discussion

325.	/_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

326.	/_With increase in molecular weight of the gas, the head developed by a centrifugal compressor will?
A.	Decrease
B.	Increase
C.	Remain same
D.	Unpredictable
Answer» B. Increase

Discussion

327.	/_In continuous fluidisation?
A.	Solids are completely entrained
B.	The pressure drop is less than that for batch fluidisation
C.	There is no entrainment of solids
D.	Velocity of the fluid is very small
Answer» B. The pressure drop is less than that for batch fluidisation

Discussion

328.	/_A centrifugal pump designed for handling water (≈í¬∫ = 1 cp) will deliver __________ when pumping a thicker oil (≈í¬∫ = 30 cp).?
A.	Less head & capacity
B.	More head
C.	More capacity
D.	Less head & more capacity
Answer» B. More head

Discussion

329.	/_The momentum correction factor for the velocity distribution of laminar flow is?
A.	1.3
B.	1.66
C.	2.5
D.	None of these
Answer» E.

Discussion

330.	/_A stream tube is that, which has __________ cross-section entirely bounded by stream lines.?
A.	A circular
B.	Any convenient
C.	A small
D.	A large
Answer» C. A small

Discussion

331.	/_Which is not a variable head meter??
A.	Venturimeter
B.	Pitot tube
C.	Rotameter
D.	None of these
Answer» D. None of these

Discussion

332.	/_The value of critical Reynolds number for pipe flow is?
A.	1300
B.	10,000
C.	100,000
D.	None of these
Answer» B. 10,000

Discussion

333.	/_Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will?
A.	Increase
B.	Decrease
C.	Remain same
D.	Data insufficient to predict pressure drop
Answer» B. Decrease

Discussion

334.	/_Water is flowing at 1 m/sec through a pipe (of 10 cm I.D) with a right angle bend. The force in Newtons exerted on the bend by water is?
A.	10‚Äö√ √∂2≈ì√Ñ
B.	5≈ì√Ñ/2
C.	5‚Äö√ √∂2≈ì√Ñ
D.	5≈ì√Ñ/‚Äö√ √∂2
Answer» C. 5‚Äö√ √∂2≈ì√Ñ

Discussion

335.	/_In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of?
A.	Relative roughness
B.	Absolute roughness
C.	Friction co-efficient for flows at equal Reynold number
D.	All of the above
Answer» D. All of the above

Discussion

336.	/_Momentum transfer in laminar flow of fluids results due to the?
A.	Viscosity
B.	Density
C.	Velocity gradient
D.	None of these
Answer» D. None of these

Discussion

337.	/_Volute type of casing is provided in a centrifugal pump to?
A.	Convert velocity head to pressure head
B.	Convert pressure head to velocity head
C.	Reduce the discharge fluctuation
D.	Increase the discharge
Answer» E.

Discussion

338.	/_Multistage compressors are used in industry, because they?
A.	Reduce the cost of compressor
B.	Reduce the size requirement
C.	Resemble closely to isothermal compression
D.	Are easy to control
Answer» D. Are easy to control

Discussion

339.	/_Various efficiencies of a centrifugal pump are related as (where, ≈í‚àëm = mechanical efficiency ≈í‚àëv = volumetric efficiency. ≈í‚àëma = manometric efficiency ≈í‚àëo = overall efficiency)?
A.	≈í‚àëma x ≈í‚àëm x ≈í‚àëv = ≈í‚àëo
B.	≈í‚àëm = ≈í‚àëv . ≈í‚àëma
C.	≈í‚àëma = ≈í‚àëm x ≈í‚àëv
D.	≈í‚àëv = ≈í‚àëm x ≈í‚àëma
Answer» C. ≈í‚àëma = ≈í‚àëm x ≈í‚àëv

Discussion

340.	/_The buoyant force acting on a floating body is dependent on the?
A.	Viscosity of the liquid
B.	Weight of the liquid displaced
C.	Depth of immersion of the body
D.	Surface tension of the liquid
Answer» C. Depth of immersion of the body

Discussion

341.	/_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
Answer» B. Viscous forces predominate

Discussion

342.	/_Capacity of a rotary gear pump can be varied by?
A.	Changing the speed of rotation
B.	Bleeding air into suction
C.	Bypassing liquid from the suction or discharge line
D.	All of the above
Answer» E.

Discussion

343.	/_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

344.	/_An ideal fluid is?
A.	Non-viscous
B.	Incompressible
C.	Both A & B
D.	Neither A & B
Answer» D. Neither A & B

Discussion

345.	/_A gas?
A.	Signifies absence of density
B.	Can resist shearing action
C.	Is incompressible
D.	Is a supercritical vapor
Answer» E.

Discussion

346.	/_Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump.?
A.	Reciprocating
B.	Plunger
C.	Electromagnetic
D.	Gear
Answer» D. Gear

Discussion

347.	/_Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have?
A.	Very low speeds
B.	Smaller discharge
C.	Higher capital &maintenance cost
D.	High vibrations
Answer» D. High vibrations

Discussion

348.	/_The schedule number of a pipe is an indication of its?
A.	Size
B.	Roughness
C.	Material density
D.	Wall thickness
Answer» E.

Discussion

349.	/_Which of the following may be termed as a variable orifice flowmeter??
A.	Rotameter
B.	Pitot tube
C.	V-notch
D.	All of the above
Answer» B. Pitot tube

Discussion

350.	/_The component of acceleration resulting due to unsteady nature of flow is called __________ acceleration.?
A.	Normal
B.	Local
C.	Convective
D.	Tangential
Answer» C. Convective

Discussion

Explore topic-wise MCQs in Chemical Engineering.

*$_Which of the following is not dimension-less??

*/*_Which is the most efficient and best for measuring very small flow rate of gases??

*/*_Pressure drop in a packed bed for laminar flow is given by the __________ equation.?

*/*_The dimension of dynamic viscosity is?

*/*_Slugging in a fluidised bed can be avoided by using?

*/*_With increasing flow rate, the hydraulic efficiency of a centrifugal pump?

*/*_Gear pump?

*/*_What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition??

*/*_Froude number is not a factor?

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

*/*_What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir??

*/*_The valve used for very remote and accurate control of fluid is a __________ valve.?

*/*_Priming is needed in a __________ pump.?

*/*_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??

*/*_The pressure head on sudden contraction in a horizontal pipe is converted into the __________ head.?

*/*_Drag force on the float of a rotameter is(where Q = flow rate of the )?

*/*_Which of the following is the most common pump for pumping either raw sewage or sludge??

*/*_Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an?

*/*_Cavitation in a centrifugal pump results from?

*/*_The ratio of pressure forces to inertial forces is called the __________ number.?

*/*_A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an __________ fluid.?

*/*_What is the value of Fanning friction factor f ' for smooth pipe at NRe = 10‚Äö√Ö‚àÇ approximately??

*/*_The terminal velocity of a small sphere settling in a viscous fluid varies as the?

*/*_For laminar flow through a closed conduit?

*/*_With increase in molecular weight of the gas, the head developed by a centrifugal compressor will?

*/*_In continuous fluidisation?

*/*_A centrifugal pump designed for handling water (≈í¬∫ = 1 cp) will deliver __________ when pumping a thicker oil (≈í¬∫ = 30 cp).?

*/*_The momentum correction factor for the velocity distribution of laminar flow is?

*/*_A stream tube is that, which has __________ cross-section entirely bounded by stream lines.?

*/*_Which is not a variable head meter??

*/*_The value of critical Reynolds number for pipe flow is?

*/*_Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will?

*/*_Water is flowing at 1 m/sec through a pipe (of 10 cm I.D) with a right angle bend. The force in Newtons exerted on the bend by water is?

*/*_In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of?

*/*_Momentum transfer in laminar flow of fluids results due to the?

*/*_Volute type of casing is provided in a centrifugal pump to?

*/*_Multistage compressors are used in industry, because they?

*/*_Various efficiencies of a centrifugal pump are related as (where, ≈í‚àëm = mechanical efficiency ≈í‚àëv = volumetric efficiency. ≈í‚àëma = manometric efficiency ≈í‚àëo = overall efficiency)?

*/*_The buoyant force acting on a floating body is dependent on the?

*/*_At high Reynolds number?

*/*_Capacity of a rotary gear pump can be varied by?

*/*_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?

*/*_An ideal fluid is?

*/*_A gas?

*/*_Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump.?

*/*_Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have?

*/*_The schedule number of a pipe is an indication of its?

*/*_Which of the following may be termed as a variable orifice flowmeter??

*/*_The component of acceleration resulting due to unsteady nature of flow is called __________ acceleration.?

/_Which is the most efficient and best for measuring very small flow rate of gases??

/_Pressure drop in a packed bed for laminar flow is given by the __________ equation.?

/_The dimension of dynamic viscosity is?

/_Slugging in a fluidised bed can be avoided by using?

/_With increasing flow rate, the hydraulic efficiency of a centrifugal pump?

/_Gear pump?

/_What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition??

/_Froude number is not a factor?

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

/_What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir??

/_The valve used for very remote and accurate control of fluid is a __________ valve.?

/_Priming is needed in a __________ pump.?

/_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??

/_The pressure head on sudden contraction in a horizontal pipe is converted into the __________ head.?

/_Drag force on the float of a rotameter is(where Q = flow rate of the )?

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

/_Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an?

/_Cavitation in a centrifugal pump results from?

/_The ratio of pressure forces to inertial forces is called the __________ number.?

/_A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an __________ fluid.?

/_What is the value of Fanning friction factor f ' for smooth pipe at NRe = 10‚Äö√Ö‚àÇ approximately??

/_The terminal velocity of a small sphere settling in a viscous fluid varies as the?

/_For laminar flow through a closed conduit?

/_With increase in molecular weight of the gas, the head developed by a centrifugal compressor will?

/_In continuous fluidisation?

/_A centrifugal pump designed for handling water (≈í¬∫ = 1 cp) will deliver __________ when pumping a thicker oil (≈í¬∫ = 30 cp).?

/_The momentum correction factor for the velocity distribution of laminar flow is?

/_A stream tube is that, which has __________ cross-section entirely bounded by stream lines.?

/_Which is not a variable head meter??

/_The value of critical Reynolds number for pipe flow is?

/_Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will?

/_Water is flowing at 1 m/sec through a pipe (of 10 cm I.D) with a right angle bend. The force in Newtons exerted on the bend by water is?

/_In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of?

/_Momentum transfer in laminar flow of fluids results due to the?

/_Volute type of casing is provided in a centrifugal pump to?

/_Multistage compressors are used in industry, because they?

/_Various efficiencies of a centrifugal pump are related as (where, ≈í‚àëm = mechanical efficiency ≈í‚àëv = volumetric efficiency. ≈í‚àëma = manometric efficiency ≈í‚àëo = overall efficiency)?

/_The buoyant force acting on a floating body is dependent on the?

/_At high Reynolds number?

/_Capacity of a rotary gear pump can be varied by?

/_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?

/_An ideal fluid is?

/_A gas?

/_Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump.?

/_Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have?

/_The schedule number of a pipe is an indication of its?

/_Which of the following may be termed as a variable orifice flowmeter??

/_The component of acceleration resulting due to unsteady nature of flow is called __________ acceleration.?