8247 + Mcqs in Chemical Engineering Page 88 McqOptions

4351.	Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of __________ pressure.
A.	small differential
B.	atmospheric
C.	absolute
D.	gage
Answer» B. atmospheric

Discussion

4352.	Isotropic turbulence occurs
A.	where there is no velocity gradient.
B.	at higher temperatures.
C.	only in Newtonion fluids.
D.	none of these.
Answer» B. at higher temperatures.

Discussion

4353.	The co-efficient of drag and lift for an incompressible fluid depends on the
A.	Reynolds number
B.	Froude number
C.	Mach number
D.	all (a), (b) and (c)
Answer» B. Froude number

Discussion

4354.	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

4355.	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

4356.	A centrifugal pump loses prime after starting. The reason of this trouble may be
A.	incomplete priming.
B.	too high a suction lift.
C.	low available NPSH and air leaks in the suction pipe.
D.	all (a), (b), and (c).
Answer» E.

Discussion

4357.	Venturimeter and orificemeter measures the __________ of the fluid.
A.	pressure
B.	maximum velocity
C.	average velocity
D.	point velocity
Answer» D. point velocity

Discussion

4358.	Which of the following may be termed as a variable orifice flowmeter ?
A.	Rotameter
B.	Pitot tube
C.	V-notch
D.	All (a), (b) and (c)
Answer» B. Pitot tube

Discussion

4359.	Surge tanks are provided in high pressure water pipelines to
A.	store a definte quantity ofwater all the time,
B.	reduce the water hammer.
C.	facilitate easy dismantling of pipeline for cleaning and maintenance.
D.	none of these.
Answer» C. facilitate easy dismantling of pipeline for cleaning and maintenance.

Discussion

4360.	The fluid property which matters for fall-ing rain drops to acquire spherical shape is its
A.	pressure
B.	height of descend
C.	viscosity
D.	surface tension
Answer» E.

Discussion

4361.	The simple pitot tube does not measure the
A.	static pressure.
B.	dynamic pressure.
C.	velocity at the stagnation point.
D.	all (a), (b) and (c).
Answer» E.

Discussion

4362.	Boundary layer separation occurs when the
A.	pressure reaches a minimum.
B.	cross-section of the channel is reduced.
C.	valve is closed in a pipeline.
D.	velocity of sound is reached.
Answer» C. valve is closed in a pipeline.

Discussion

4363.	The head loss in turbulent flow in a pipe varies
A.	directly as the velocity.
B.	inversely as the square of the velocity.
C.	approximately as the square of the velocity.
D.	inversely as the square of the diameter.
Answer» D. inversely as the square of the diameter.

Discussion

4364.	The capacity of an accumulator is the maximum
A.	energy which it can store.
B.	discharge which it can deliver.
C.	liquid which it can store.
D.	none of these.
Answer» B. discharge which it can deliver.

Discussion

4365.	With increase in the temperature, viscosity of a liquid
A.	increases
B.	decreases
C.	remains constant
D.	may increase or decrease; depends on the liquid
Answer» C. remains constant

Discussion

4366.	The pump impeller and the turbine runner in a hydraulic torque converter
A.	have the same diameter.
B.	have different diameters.
C.	are directly coupled.
D.	none of these.
Answer» C. are directly coupled.

Discussion

4367.	Reciprocating pumps compared to centrifugal pumps
A.	deliver liquid at uniform pressure.
B.	can handle slurries more efficiently.
C.	are not subject to air binding.
D.	can be operated with delivery valve closed.
Answer» D. can be operated with delivery valve closed.

Discussion

4368.	Which of the following fluid forces are not considered in the Navier-Stoke's equation?
A.	Gravity forces
B.	Viscous forces
C.	Pressure forces
D.	Turbulent forces
Answer» E.

Discussion

4369.	Minimum fluidisation velocity for a specific system depends upon the
A.	particle size.
B.	fluid viscosity.
C.	density of both the particle & the fluid.
D.	all (a), (b) and (c).
Answer» E.

Discussion

4370.	Potential flow is characterised by the
A.	irrotational and frictionless flow.
B.	irrotational and frictional flow.
C.	one in which dissipation of mechanical energy into heat occurs.
D.	formation of eddies within the stream.
Answer» B. irrotational and frictional flow.

Discussion

4371.	For the production of very high vacuum, a __________ pump is normally used.
A.	diffusion
B.	centrifugal
C.	jet ejector
D.	piston
Answer» B. centrifugal

Discussion

4372.	In parallel pipe problems, the
A.	head loss is the same through each pipe.
B.	discharge is the same through all the pipes.
C.	total head loss is equal to the sum of the head losses through each pipe.
D.	none of these.
Answer» B. discharge is the same through all the pipes.

Discussion

4373.	Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is - 57 C and 5.2 atm).
A.	Pressure must be kept below 5.2 atm.
B.	Temperature must be kept above - 57 C.
C.	Pressure must be kept below 5.2 atm. and temperature must be kept above 57 C.
D.	Pressure and temperature must be kept below 5.2 atm. and - 57 C respectively.
Answer» E.

Discussion

4374.	If two pure liquid constituents are mixed in any proportion to give an ideal solution, there is no change in
A.	volume
B.	enthalpy
C.	both (a) & (b)
D.	neither (a) nor (b)
Answer» D. neither (a) nor (b)

Discussion

4375.	Chemical potential of ith component of a system is given by
A.	<img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/395-69-1.png">
B.	<img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/395-69-2.png">
C.	<img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/395-69-3.png">
D.	<img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/395-69-4.png">
Answer» B. <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/395-69-2.png">

Discussion

4376.	One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is
A.	30554
B.	10373
C.	4988.4
D.	4364.9
Answer» C. 4988.4

Discussion

4377.	Lenz's law results from the law of conservation of
A.	mass
B.	momentum
C.	energy
D.	none of these
Answer» D. none of these

Discussion

4378.	The minimum number of phases that can exist in a system is
A.	0
B.	1
C.	2
D.	3
Answer» C. 2

Discussion

4379.	Enthalpy changes over a constant pressure path are always zero for __________ gas.
A.	any
B.	a perfect
C.	an easily liquefiable
D.	a real
Answer» C. an easily liquefiable

Discussion

4380.	'The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture". This is
A.	the statement as per Gibbs-Helmholtz
B.	called Lewis-Randall rule
C.	Henry's law
D.	none of these
Answer» C. Henry's law

Discussion

4381.	__________ does not change during phase transformation processes like sublimation, melting & vaporisation.
A.	Entropy
B.	Gibbs free energy
C.	Internal energy
D.	all (a), (b) & (c)
Answer» C. Internal energy

Discussion

4382.	Which one is true for a throttling process ?
A.	A gas may have more than one inversion temperatures.
B.	The inversion temperature is different for different gases.
C.	The inversion temperature is same for all gases.
D.	The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity.
Answer» C. The inversion temperature is same for all gases.

Discussion

4383.	1m3 of an ideal gas at 500 K and 1000 kPa expands reversibly to 5 times its initial volume in an insulated container. If the specific heat capacity (at constant pressure) of the gas is 21 J/mole . K, the final temperature will be
A.	35 K
B.	174 K
C.	274 K
D.	154 K
Answer» D. 154 K

Discussion

4384.	For a thermodynamic system containing 'x' chemical species, the maximum number of phases that can co-exist at equilibrium is
A.	x
B.	x + 1
C.	x + 2
D.	x + 3
Answer» D. x + 3

Discussion

4385.	Henry's law is closely obeyed by a gas, when its __________ is extremely high.
A.	pressure
B.	solubility
C.	temperature
D.	none of these
Answer» E.

Discussion

4386.	Fugacity and pressure are numerically not equal for the gases
A.	at low temperature and high pressure.
B.	at standard state.
C.	both (a) and (b).
D.	in ideal state.
Answer» D. in ideal state.

Discussion

4387.	A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount". This is
A.	the distribution law.
B.	followed from Margule's equation.
C.	a corollary of Henry's law.
D.	none of these.
Answer» B. followed from Margule's equation.

Discussion

4388.	A solid is transformed into vapour without going to the liquid phase at
A.	triple point
B.	boiling point
C.	below triple point
D.	always
Answer» B. boiling point

Discussion

4389.	A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system are
A.	4
B.	3
C.	5
D.	6
Answer» C. 5

Discussion

4390.	A gas performs the maximum work, when it expands
A.	non-uniformly
B.	adiabatically
C.	isobarically
D.	isothermally
Answer» D. isothermally

Discussion

4391.	There is a change in __________ during the phase transition.
A.	volume
B.	pressure
C.	temperature
D.	all a, b & c
Answer» B. pressure

Discussion

4392.	Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is
A.	positive
B.	negative
C.	zero
D.	infinity
Answer» D. infinity

Discussion

4393.	First law of thermodynamics deals with the
A.	direction of energy transfer.
B.	reversible processes only.
C.	irreversible processes only.
D.	none of these.
Answer» B. reversible processes only.

Discussion

4394.	Which of the following is affected by the temperature ?
A.	Fugacity
B.	Activity co-efficient
C.	Free energy
D.	All (a), (b) & (c)
Answer» E.

Discussion

4395.	Work done may be calculated by the expression for __________ processes.
A.	non-flow reversible
B.	adiabatic
C.	both (a) and (b)
D.	neither (a) nor (b)
Answer» D. neither (a) nor (b)

Discussion

4396.	The adiabatic throttling process of a perfect gas is one of constant enthalpy
A.	in which there is a temperature drop.
B.	which is exemplified by a non-steady flow expansion.
C.	which can be performed in a pipe with a constriction.
D.	in which there is an increase in temperature.
Answer» D. in which there is an increase in temperature.

Discussion

4397.	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

4398.	For pumping slurry, one can use a __________ pump.
A.	reciprocating
B.	diaphargm
C.	centrifugal
D.	pneumatic
Answer» C. centrifugal

Discussion

4399.	Bernoulli's equation describes the
A.	mechanical energy balance in potential flow.
B.	kinetic energy balance in laminar flow.
C.	mechanical energy balance in turbulent flow.
D.	mechanical energy balance in boundary layer.
Answer» B. kinetic energy balance in laminar flow.

Discussion

4400.	Which law/principle of solid mechanics is similar/equivalent to Newton's law of viscosity in fluid mechanics ?
A.	Archimedes principle.
B.	Newton's second law of motion.
C.	Hooke's law.
D.	Newton's third law of motion.
Answer» D. Newton's third law of motion.

Discussion

Explore topic-wise MCQs in Engineering.

Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of __________ pressure.

Isotropic turbulence occurs

The co-efficient of drag and lift for an incompressible fluid depends on the

Euler's equation of motion states, that at every point, the

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 centrifugal pump loses prime after starting. The reason of this trouble may be

Venturimeter and orificemeter measures the __________ of the fluid.

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

Surge tanks are provided in high pressure water pipelines to

The fluid property which matters for fall-ing rain drops to acquire spherical shape is its

The simple pitot tube does not measure the

Boundary layer separation occurs when the

The head loss in turbulent flow in a pipe varies

The capacity of an accumulator is the maximum

With increase in the temperature, viscosity of a liquid

The pump impeller and the turbine runner in a hydraulic torque converter

Reciprocating pumps compared to centrifugal pumps

Which of the following fluid forces are not considered in the Navier-Stoke's equation?

Minimum fluidisation velocity for a specific system depends upon the

Potential flow is characterised by the

For the production of very high vacuum, a __________ pump is normally used.

In parallel pipe problems, the

Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is - 57 C and 5.2 atm).

If two pure liquid constituents are mixed in any proportion to give an ideal solution, there is no change in

Chemical potential of ith component of a system is given by

One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is

Lenz's law results from the law of conservation of

The minimum number of phases that can exist in a system is

Enthalpy changes over a constant pressure path are always zero for __________ gas.

'The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture". This is

__________ does not change during phase transformation processes like sublimation, melting &amp; vaporisation.

Which one is true for a throttling process ?

1m3 of an ideal gas at 500 K and 1000 kPa expands reversibly to 5 times its initial volume in an insulated container. If the specific heat capacity (at constant pressure) of the gas is 21 J/mole . K, the final temperature will be

For a thermodynamic system containing 'x' chemical species, the maximum number of phases that can co-exist at equilibrium is

Henry's law is closely obeyed by a gas, when its __________ is extremely high.

Fugacity and pressure are numerically not equal for the gases

A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount". This is

A solid is transformed into vapour without going to the liquid phase at

A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system are

A gas performs the maximum work, when it expands

There is a change in __________ during the phase transition.

Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is

First law of thermodynamics deals with the

Which of the following is affected by the temperature ?

Work done may be calculated by the expression for __________ processes.

The adiabatic throttling process of a perfect gas is one of constant enthalpy

Fluid flow through a packed bed is represented by the __________ equation.

For pumping slurry, one can use a __________ pump.

Bernoulli's equation describes the

Which law/principle of solid mechanics is similar/equivalent to Newton's law of viscosity in fluid mechanics ?

__________ does not change during phase transformation processes like sublimation, melting & vaporisation.