D2 Chem Eng Principles Flashcards by Ella Angelan

The Monod Model relates

Specific growth rate to the
substrate availability

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Turbidostat is recommended when continuous
fermentation needs to be carried out at

high dilution rates near the
washout point

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In plug flow tubular reactor the axial velocity
profile on cross-section will be

constant

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Dimension of surface tension is (where, F =
force, L = length)

MT-2

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_________ pumps are axial flow pumps.

propeller

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A fluid whose apparent viscosity increases
with shear rate is termed as the _____

dilatant

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The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the

suction minus vapor pressure of the liquid at suction
temperature

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Baffles in mixing tanks are provided to

reduce swirling and vortex formation.

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In a heat exchanger, floating head is provided to

relieve stresses caused by
thermal expansion

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Partial molar free energy of an element A in
solution is same as its

chemical potential

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Fresh water carrying pipelines in chemical
industries are colored with __________ color.

Sea Green

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Which of the following material is seldom used
for pressure vessel construction?

Rimmed Steel

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25 per cent cut segmental baffle means that
the baffle

Height is 75% of the ID of the
shell

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Liquid/petroleum fuel storage tanks are built
underground (as in case of petrol pumps),
when the storage capacity is less than
__________ kilolitres.

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Le/D for fully open globe value may be around

300

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Holes of a sieve tray are arranged in triangular
pitch of __________ times the hole diameter.

2.5 to 5

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In case of a shell and tube heat exchanger,
the minimum shell thickness for carbon steel
(inclusive of corrosion allowance) depends on
shell diameter and is in the range of
__________ mm

5-11

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In case of bubble cap distillation column of
diameter greater than 1.2 meters, the cap
diameter is roughly about __________ cm.

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Tube side pressure drop in a 1-2 heat
exchanger (for turbulent flow of fluids through
the tubes) is about __________ times, that in
a 1-1 heat exchanger having the same size &
number of tubes and operated at the same
liquid flow rate

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It is not desirable to design a heat exchanger
for LMTD correction factor, FT, of less than

0.8

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Apex angle of conical heads used
in the bottom heads of chemical
process equipment is usually

60 degree

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Lessing ring is formed by the addition of a
partition across the centre of a raschig ring,
which results in an area increase of about
__________ percent.

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(BOARD) Bracket supports are the most suitable for
supporting __________ vessels

thick walled vertical

Saddle supports are used for supporting
__________ vessels

Horizontal Cylindrical

Vertical vessels are not supported by

saddles

Skirt support is the most suitable for supporting __________ vessels.

tall vertical

Shell side heat transfer coefficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is

less

The main purpose of providing stepping on the trays is to

facilitate handling of large flow rate of liquid

______ tray arrangement is recommended for distillation column having diameter up to 4 ft.

Cross flow

(ALWAYS) What is the value of 'q' for saturated liquid feed to a distillation column ?

Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.

chemical properties

Which of the following is the most suitable for extraction in a system having very low density difference ?

centrifugal extractor

In distillation columns, the number of bubble caps per tray primarily depends upon the

allowable gas and liquid velocities.

Rivets are generally specified by the

shank diameter

The ratio of pressure forces to inertial forces is called the __________ number.

Euler

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

f1/4

The fluid property, due to which, mercury does not wet the glass is

surface tension

When the momentum of one fluid is used for moving another fluid, such a device is called a/an

jet pump

The normal stress is the same in all directions at a point in a fluid, when the fluid is

having no motion of one fluid layer relative to the other.

Most commonly used joint in the underground pipe lines is the

sleevejoint

Water hammer in a pipeline results from the

rapid pressure change due to a rapid change in the rate of flow

In a multipass shell and tube heat exchanger, the baffles on shell side is primarily provided for

creating turbulence

When the feed to a distillation column is a saturated liquid, slope of the feed line is

infinity - indiabix (undefined real)

What is the value of 'q' for saturated vapor feed to a distillation column ? (where q = fraction of the feed stream that is liquid.)

_______ column is preferred to be used, when a **high liquid hold up** is required in a reactor for gas-liquid reaction.

Bubble

____ head is the most economical for cylindrical vessels designed for operating at high pressure **(> 15 atm).**

Ellipsoidal

Laminar flow of a Newtonian fluid ceases to exist, when the Reynolds number exceeds

2100

Which of the following equations is valid for laminar flow of a fluid through packed bed?

Kozeny-Karman equation

Chance process is used for the

cleaning of coal

What is the dispersion number for a CSTR?

∞

Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is

mainly confined to a thin film of fluid near the surface

Baffles are provided in heat exchangers to increase the

heat transfer coeeficient

Nitric acid is not used in the manufacture of

detergent

What do you call the efficiency in a turbine?

isentropic efficiency

In filtration, the flowrate is proportional to

pressure drop

What class of bacteria are the following: Escherichia coli and salmonella.

Proteobacteria (also gram negative)

Which of the following equations is valid for laminar flow of a fluid through filtration?

Hagen-Poiseuille equation