D2 Trivia Flashcards
purpose of tanning in leather industry
stiffen leather
Zirconia probe is used for the continuous measurement of _____
oxygen in flue gases
operating velocity in packed tower is usually ___ the flooding velocity
half
absorbent used to decolorise yellow glycerine
activated carbon
most suitable gas-liquid contacting device involving highly corrosive fluids
packed tower
tube pitch is defined as
shortest center to center distance between adjacent tubes
with increase in number of shell passes, Ft:
increases
holes of a sieve tray are arranged in triangular pitch of ____ times the hole diameter
2.5 to 5
in case of a shell and tube HEx, the minimum shell thickness for carbon steel depends on shell diameter and is in the range of
5-11 mm
tube side pressure drop in a 1-2 HEx is about ___ times that in a 1-1 HEx with the same size, number of tubes, and liquid flow rate
8
In a HEx, shell side fluid velocity can be changed by changing the tube
layout and pitch
triangular pitch layout compared to square pitch in a shell and tube HEx:
uses more tubes
bracket supports are the most suitable for supporting
thick-walled vertical vessels
color of fresh water carrying pipelines
sea green
material seldom used for pressure vessel construction
Rimmed Steel
25 per cent cut segmental baffle means that
the baffle
Height is 75% of the ID of the shell
Liquid/petroleum fuel storage tanks are built
underground (as in case of petrol pumps),
when the storage capacity is less than
__________ kilolitres.
45
Le/D for fully open globe value may be around
300
In case of bubble cap distillation column of
diameter greater than 1.2 meters, the cap
diameter is roughly about __________ cm.
10
It is not desirable to design a heat exchanger
for LMTD correction factor, FT, of less than
0.8
Two iron pipes of the same nominal diameter
but different schedule numbers will have the
same
inside diameter
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.
20
Shell side heat transfer co-efficient in case of
square pitch as compared to the triangular
pitch under similar conditions of fluid flow and
tube size is
less
tray arrangement recommended for
distillation column having diameter up to 4 ft.
Cross flow
value of ‘q’ for saturated liquid feed to a distillation column
1
main purpose of providing stepping on the
trays
facilitate handling of large flow rate of liquid
Needle valves are generally not used for
very large diameter pipes
undesirable dynamic characteristic of an instrument
time lag
Response of a system to a sinusoidal input is
called __________ response
frequency
Mass transfer rate between two fluid phases
does not necessarily depend on the
__________ of the two phases.
chemical properties
most suitable for extraction in a system having very low density difference ?
centrifugal extractor
Total reflux in a distillation operation requires minimum
number of plates
Fenske’s equation for determining the minimum
number of theoretical stages in distillation column
holds good, when the
relative volatility is reasonably constant.
When the temperature and humidity of air is
low, we usually use __________ draft cooling
tower.
natural
used to set the diameter of the distillation column
Allowable vapor velocity.
not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?
Sorel-Lewis method.
Saddle supports are used for supporting
__________ vessels.
Horizontal Cylindrical
Kaoline is a/an
refractory material
Phenol is mainly used
to produce phenol formaldehyde
Main constituent of dolomite
MgCO3
Conversion of CO to CO2 by steam in presence of a catalyst is called
shift conversion
Bleaching action of bleaching powder is due to
its __________ properties.
oxidizing
Portland cement consists mainly of
CaO and SiO2
__________ glass has the lowest coefficient
of thermal expansion and hence is more heat
resistant.
Pyrex
Mannheim furnace is used in the manufacture
of
hydrochloric acid
Thermosetting materials
are cross-linked molecules.
purest form of iron.
Wrought
Enamels
give good glossy finish.
Black liquor is converted into white liquor by
evaporation and burning the concentrate
followed by causticisation of products.
Varnish does not contain
pigment
Liquor poisoning generally occurs due to the
presence of __________ in it.
methyl alcohol
Which of the following same diameter columns
gives lowest pressure drop per unit height ?
Packed Column
Neoprene is chemically known as
Polychlorepene
Molecular weights of polymers are in the
range of
10^2 to 10^7
In distillation columns, the number of bubble
caps per tray primarily depends upon the
allowable gas and liquid velocities.
Vertical vessels are not supported by
saddles
Rivets are generally specified by the
shank diameter
Definition of ore
a metal can be economically extracted from it.
Oleum produces fumes of
SO3
20% oleum means that in 100 kg oleum, there
are 20 kg of
SO3 and 80 kg of H2SO4
Inversion of sucrose produces
glucose
Linde process of gas liquefaction employs
adiabatic expansion through a
throttle valve (Joule-Thomson expansion)
major use of butadiene
in the manufacture of synthetic rubber.
Hydrogenation of oil takes place in a/an
__________ reactor.
trickle bed reactor
Fatty material used in soap making is
tallow
__________ glass is used for the
manufacture of optical glass.
flint
Favorable conditions for the liquefaction of
gases in general are
high pressure & low temperature.
yellow pigment
Ferrous sulphate
Common salt is generally not produced commonly by __________ method from brine.
freeze drying
Sulphuric acid is mainly used in the __________ industry.
fertilizer
Main use of hydrazine
as a rocket fuel
Main use of liquid nitrogen is in
refrigerative cooling.
Raw materials required for the manufacture of
__________ is acetylene and hydrochloric acid.
vinyl chloride
Chemical formula of oleum is
H2S2O7
Yellow glycerine is made into white, using
activated carbon
Gypsum is chemically
calcium sulfate
Zeigler process produces
high density polyethylene.
Sea weeds are an important source of
iodine
Load cells are used for the measurement of
weight
T/F: CO2 is the strongest paramagnetic gas.
False
A negative gain margin expressed in
decibels means a/an __________system.
unstable
Thermistor, which has high temperature
coefficient of resistivity, is used as the
sensing element in resistance
thermometer. It is a/an
solid semi-conductor
Flapper nozzle is used in a/an __________ controller.
pneumatic
Working principle of radiation pyrometer is based on the
Stefan-Boltzmann law
