D2 Trivia Flashcards
1
Q
purpose of tanning in leather industry
A
stiffen leather
2
Q
Zirconia probe is used for the continuous measurement of _____
A
oxygen in flue gases
3
Q
operating velocity in packed tower is usually ___ the flooding velocity
A
half
4
Q
absorbent used to decolorise yellow glycerine
A
activated carbon
5
Q
most suitable gas-liquid contacting device involving highly corrosive fluids
A
packed tower
6
Q
tube pitch is defined as
A
shortest center to center distance between adjacent tubes
7
Q
with increase in number of shell passes, Ft:
A
increases
8
Q
holes of a sieve tray are arranged in triangular pitch of ____ times the hole diameter
A
2.5 to 5
9
Q
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
A
5-11 mm
10
Q
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
A
8
11
Q
In a HEx, shell side fluid velocity can be changed by changing the tube
A
layout and pitch
12
Q
triangular pitch layout compared to square pitch in a shell and tube HEx:
A
uses more tubes
13
Q
bracket supports are the most suitable for supporting
A
thick-walled vertical vessels
14
Q
color of fresh water carrying pipelines
A
sea green
15
Q
material seldom used for pressure vessel construction
A
Rimmed Steel
16
Q
25 per cent cut segmental baffle means that
the baffle
A
Height is 75% of the ID of the shell
17
Q
Liquid/petroleum fuel storage tanks are built
underground (as in case of petrol pumps),
when the storage capacity is less than
__________ kilolitres.
A
45
18
Q
Le/D for fully open globe value may be around
A
300
19
Q
In case of bubble cap distillation column of
diameter greater than 1.2 meters, the cap
diameter is roughly about __________ cm.
A
10
20
Q
It is not desirable to design a heat exchanger
for LMTD correction factor, FT, of less than
A
0.8
21
Q
Two iron pipes of the same nominal diameter
but different schedule numbers will have the
same
A
inside diameter
22
Q
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.
A
20
23
Q
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
A
less
24
Q
tray arrangement recommended for
distillation column having diameter up to 4 ft.
A
Cross flow
25
value of 'q' for saturated liquid feed to a distillation column
1
26
main purpose of providing stepping on the
trays
facilitate handling of large flow rate of liquid
27
Needle valves are generally not used for
very large diameter pipes
28
undesirable dynamic characteristic of an instrument
time lag
29
Response of a system to a sinusoidal input is
called __________ response
frequency
30
Mass transfer rate between two fluid phases
does not necessarily depend on the
__________ of the two phases.
chemical properties
31
most suitable for extraction in a system having very low density difference ?
centrifugal extractor
32
Total reflux in a distillation operation requires minimum
number of plates
33
Fenske's equation for determining the minimum
number of theoretical stages in distillation column
holds good, when the
relative volatility is reasonably constant.
34
When the temperature and humidity of air is
low, we usually use __________ draft cooling
tower.
natural
35
used to set the diameter of the distillation column
Allowable vapor velocity.
36
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.
37
Saddle supports are used for supporting
__________ vessels.
Horizontal Cylindrical
38
Kaoline is a/an
refractory material
39
Phenol is mainly used
to produce phenol formaldehyde
40
Main constituent of dolomite
MgCO3
41
Conversion of CO to CO2 by steam in presence of a catalyst is called
shift conversion
42
Bleaching action of bleaching powder is due to
its __________ properties.
oxidizing
43
Portland cement consists mainly of
CaO and SiO2
44
__________ glass has the lowest coefficient
of thermal expansion and hence is more heat
resistant.
Pyrex
45
Mannheim furnace is used in the manufacture
of
hydrochloric acid
46
Thermosetting materials
are cross-linked molecules.
47
purest form of iron.
Wrought
48
Enamels
give good glossy finish.
49
Black liquor is converted into white liquor by
evaporation and burning the concentrate
followed by causticisation of products.
50
Varnish does not contain
pigment
51
Liquor poisoning generally occurs due to the
presence of __________ in it.
methyl alcohol
52
Which of the following same diameter columns
gives lowest pressure drop per unit height ?
Packed Column
53
Neoprene is chemically known as
Polychlorepene
54
Molecular weights of polymers are in the
range of
10^2 to 10^7
55
In distillation columns, the number of bubble
caps per tray primarily depends upon the
allowable gas and liquid velocities.
56
Vertical vessels are not supported by
saddles
57
Rivets are generally specified by the
shank diameter
58
Definition of ore
a metal can be economically extracted from it.
59
Oleum produces fumes of
SO3
60
20% oleum means that in 100 kg oleum, there
are 20 kg of
SO3 and 80 kg of H2SO4
61
Inversion of sucrose produces
glucose
62
Linde process of gas liquefaction employs
adiabatic expansion through a
throttle valve (Joule-Thomson expansion)
63
major use of butadiene
in the manufacture of synthetic rubber.
64
Hydrogenation of oil takes place in a/an
__________ reactor.
trickle bed reactor
65
Fatty material used in soap making is
tallow
66
__________ glass is used for the
manufacture of optical glass.
flint
67
Favorable conditions for the liquefaction of
gases in general are
high pressure & low temperature.
68
yellow pigment
Ferrous sulphate
69
Common salt is generally not produced commonly by __________ method from brine.
freeze drying
70
Sulphuric acid is mainly used in the __________ industry.
fertilizer
71
Main use of hydrazine
as a rocket fuel
72
Main use of liquid nitrogen is in
refrigerative cooling.
73
Raw materials required for the manufacture of
__________ is acetylene and hydrochloric acid.
vinyl chloride
74
Chemical formula of oleum is
H2S2O7
75
Yellow glycerine is made into white, using
activated carbon
76
Gypsum is chemically
calcium sulfate
77
Zeigler process produces
high density polyethylene.
78
Sea weeds are an important source of
iodine
79
Load cells are used for the measurement of
weight
80
T/F: CO2 is the strongest paramagnetic gas.
False
81
A negative gain margin expressed in
decibels means a/an __________system.
unstable
82
Thermistor, which has high temperature
coefficient of resistivity, is used as the
sensing element in resistance
thermometer. It is a/an
solid semi-conductor
83
Flapper nozzle is used in a/an __________ controller.
pneumatic
84
Working principle of radiation pyrometer is based on the
Stefan-Boltzmann law
85
relates the emf. generated in a single homogeneous wire to the temperature difference
Thomson effect
86
Dilute wine was used as a thermometric liquid
initially to develop temperature scale. First
empirical temperature scale developed was
the __________ scale.
Fahrenheit scale
87
desirable dynamic characteristic of an instrument
High fidelity
88
Bubble cap tray is the most commonly used tray in large distillation column, because
of its flexibility and nearly constant efficiency under varying conditions of operation.
89
Apex angle of conical heads used in the bottom heads of chemical process equipment is usually
60 deg
90
Nominal size of a pipe is an indication of its __________ diameter.
approximate
91
In shell and tube heat exchangers, straight tie rods are used to
hold baffle in space
92
The ratio of pressure forces to inertial forces is called the __________ number.
Euler
93
The ratio of inertial forces to elastic forces is called the __________ number.
Mach
94
If Blausius or Darcey friction
factor is 'f1' then the Fanning friction factor is equal to
f1/4
95
The fluid property, due to which, mercury does not wet the glass is
surface tension
96
When the momentum of one fluid is used for moving another fluid, such a device is called a/an
jet pump
97
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.
98
Most commonly used joint in the underground pipe lines is the
sleevejoint
99
Water hammer in a pipeline results from the
rapid pressure change due to a rapid change in the rate of flow.
100
Maxwell's thermodynamic relations applies to the
chemical systems in equilibrium.
101
not an explosive: TNT, CMC, RDX, lead azide
CMC
102
If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.
breeder
103
Foot valves provided in pumps are __________ valves.
directional control
104
most suitable material of construction for a sewer to carry sewage under high pressure is
steel
105
__________ addition increases the depth of hardness of steel.
chromium
106
Removable connection of tubes to the tube sheet
Ferrule
107
Flow rate of a river is measured by a/an
open weir
108
T/F: Maintenance cost for valve and sieve trays are comparatively more than bubble cap tray due to their relatively complicated construction features.
F
109
T/F: Bubble cap trays though most expensive are the best in situations, where low vapor rates is to be handled and a positive liquid seal is essential at all flow rates.
T
110
Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a
Magnetic flowmeter
111
termed as a variable orifice flowmeter
Rotameter
112
In a multi-pass shell and tube heat exchanger, the shell side cross flow area does not depend upon:
baffle spacing, clearance, pitch, NOTA
NOTA
113
Bernoulli's equation is dependent on the:
third thermo law, first thermo law, law of conservation of momentum, NOTA
NOTA
114
Dead zone is the
maximum change in the variable that does not change the reading of the instrument.
115
The pressure at a point in a fluid is not the same in all directions, when the fluid is viscous and
moving
116
Slugging in a fluidized bed can be avoided by using
shallow beds of solids and proper choice of particle size.
117
__________ closure is the weakest enclosure for cylindrical vessels.
Conical or flat plate
118
fluid used in hydraulic controller
oil
119
Valid/Invalid Assumption for McCabe: Reflux is not a saturated liquid.
Invalid
120
The pipe joint mostly used for pipes carrying water at low pressures is
socket joint
121
Cocks are used to control
water
122
Which of the following is an undesirable dynamic characteristic of an instrument?
time lag, static error, reproducibility, dead zone
time lag
123
drag force does not depend on:
density of fluid, density of body, velocity of body, area of body
density of body
124
widely used size reduction equipment for ____ is Bradford beaker
coal
125
Proximate analysis determines its
moisture and volatile matter
126
Builders are added in soap to act as
cleaning power booster
127
LPG comprises mainly of
propane and butane
128
Mercapsol and Unisol processes are meant for
removal of mercaptans
129
With increase in temperature, the electrical conductivity of Pt used in the resistance thermometer
decreases
130
If ideal solution is formed by mixing two pure liquids in any proportion, then the ____ of mixing is zero
enthalpy and volume
131
Bright coal contains:
mainly vitrain and clarain and is generally coking
132
Pure nickel is
ferromagnetic at room temp
133
T/F: Cold working of a metal decreases its fatigue strength
False
134
Material of construction of pipe generally used for conveying water in India is
cast iron
135
Addition of ____ in steel is helpful in increasing the depth of hardness
chromium
136
In case of design of a shell and tube HEx:
- min cleaning lane of 6.5mm is provided when square pitch
- minimum tube sheet thickness = O.D. (D=15mm); thickness < O.D. (D>15mm)
- OD = 6 to 40 mm; L = 0.5, 2.5, 3, 4, 5, 6
- AOTA
AOTA
137
Phytochemical smog is formed from automobile exhaust:
- by rxn of hydrocarbon and nitric oxide in the presence of sunlight
- appears only on sunny days
- is harmful for crops and trees also besides causing eye irritation and asthma
- AOTA
AOTA
138
Aluminum is extracted from
bauxite
139
Components for gunpowder
saltpeter, charcoal, sulfur
140
paper pulp produced by kraft/sulfate process
strong and fibrous
141
chemical composition of viscose rayon
regenerated cellulose acetate
142
process that produces styrene from ethyl benzene
dehydrogenation
143
hydrolyzed to produce gelatin
collagen
144
thick brown syrup made from raw sugar
molasses
145
used to make surgical sutures and wound dressings; found in many fungal cell walls and in exoskeletons of anthropods
chitin
146
sucrose content in raw juice from sugar cane
15-20%
147
Rose oil is extracted from rose leaves using _____ distillation
steam
148
When the solvent dissolves very little of solute then
large quantity of solvent is required to extract the solute
149
The triangle whose one corner coincides with the enriching line and the outer corner is on the stripping line is called the
feed plate
150
Flash distillation is suitable for the separation of components
having very wide boiling points
151
Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when
vapor phase obeys Dalton's law and liquid phase obeys Raoult's law.
152
Leaching of coarse solid lumps is also termed as
percolation
153
Large scale usage of flash distillation is practiced in
petroleum refining
154
In an operating distillation column, the
driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column.
155
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapor, because
mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition.
156
Actual work delivered divided by the corresponding ideal work is known as ____ efficiency.
turbine
157
Heat capacity is defined as C = dQ/dT, what is the difficulty about the relationship of C to Q which are supposedly state functions?
It is a process-dependent quantity
158
Which of the following gives the most work we can get out of an adiabatic system?
Irrev exp, rev exp, rev comp, irrev comp
Reversible expansion
159
What happens to delta U when work is done by the system during the adiabatic expansion of ideal gas?
Decreases
160
For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poiseuille equation predict the volumetric flowrate to be proportional to
R^4
161
Pipes having diameter 14 inches or more are designated by their
outside diameter
162
When the flow is laminar, the pressure drop is _________ to the velocity
proportional (first power)
163
Schedule number of a pipe, which is a measure of its wall thickness, is given by
1000 P'/S
164
Molten soap mass is transported by a ____ pump.
gear
165
Nominal size of the discharge pipe of a pump is usually _____ the nominal size of the inlet pipe.
smaller than
166
Location of vena-contracta in an orificemeter does not depend upon the:
pipe roughness, type of orifice, ratio of pipe diameter to orifice diameter, density/viscosity/compressibility of fluid
type of orifice
167
Location of vena-contracta in an orificemeter does not depend upon the:
pipe roughness, type of orifice, ratio of pipe diameter to orifice diameter, density/viscosity/compressibility of fluid
type of orifice
168
High specific speed of a pump implies that, it is a/an _____ pump.
axial flow
169
The cracking of crude oil is a ____ reaction.
hetero/homo
catalytic/non-catalytic
heterogeneous catalytic
170
For an identical conversion and throughput, which of the reactors will have a larger volume if the reaction is second order?
backmix reactor
171
Inversion of cane sugar is an example of
bimolecular reaction with first order
172
Which of the following fixes the volume of a batch reactor for a particular conversion and production rate?
density of mixture
173
In operating a batch filter, which of the following is the correct method of operation?
Keeping the pressure constant, the rate of flow increases.
The particles forming the cake should be large.
Keeping the flowrate constant and gradually increase the pressure.
The slower the flowrate, the more efficient the recovery.
Keeping the flowrate constant and gradually increase the pressure.
174
This dimensionless number relates buoyancy forces to viscous forces.
Grashof Number
175
For the same system, if the same liquid used in the absorber is decreased the tower height will
increase
176
For a given value of Nusselt number, the convective surface coefficient h is directly proportional to:
thermal conductivity, length, mass, density
thermal conductivity
177
glycerine is a by-product of the ____ industry
soap
178
flexible foam for mattresses is made of
polyurethanes
179
in an integrated steel plant, NH3 present in coke oven gas is normally recovered as
A) (NH4)2SO4
B) NH4Cl
C) (NH4)2NO3
D) liquid NH3
(NH4)2SO4
180
in refining cane sugar, hydrated lime is added to the sugar syrup followed by carbonation of the resulting solution. the purpose of this step is to:
adjust pH of syrup
181
permanent hardness of water can be removed by:
- addition of soda ash
- treating with zeolites
- passing it through sodium hexametaphosphate
- AOTA
AOTA
182
chalcopyrite is the main ore of
copper
183
seawater contains about ____ ppm bromine
70
184
biodegradable detergents:
can be readily oxidized
185
momentum transfer in laminar flow of fluids results due to the
velocity gradient
186
capillary rise of mercury is maximum in glass tube of dia ___ mm
0.5
187
a unit operation is exemplified by the process of
desorption
188
typical specifications for design stipulate the gain margin and phase margin to be respectively
>1.7 and >30
189
in Orsat flue gas analysis, CO is absorbed by
cuprous chloride
190
in Orsat flue gas analysis, CO2 is absorbed by
KOH
191
in Orsat flue gas analysis, O2 is absorbed by
pyrogallol
192
minimum baffle height should be
twice the impeller diameter
193
normal range of velocity of water in pipes
1-2 m/s
194
slope of the operating line in the rectifying section of a distillation column
∞
195
shell side pressure drop in a shell and tube heat exchanger is maximum for ____ baffle
orifice
196
the function of manholes provided in the shell of a distillation column is to
give access to the individual trays for cleaning, maintenance, and installation
197
Neumann reversal reaction during coal gasification
2CO = C + CO2
198
drug used in contraceptives
mestranol
199
maximum work secured by expanding the gas over a given pressure range is ____ work
isothermal
200
high ____ is an undesirable property for a good refrigerant
viscosity
201
fundamental principle of refrigeration is based on the ____ law of thermodynamics
second
202
degrees of freedom at triple point will be
0
203
in distillation overhead product contains
any number of components
204
ratio of volumes of mixed reactor to plug flow reactor is always
>1
205
T/F: Diameter of randomly packed tower is normally more than 1.2 meters
F
206
in turbulent flow, the
shear stresses are generally larger than in laminar flow
207
flow of incompressible fluid with no shear
potential flow
208
power number is the ratio of
drag stress to inertial stress
209
highest output for the same value of hot and cold junction temp
chromel-constantan
210
T/F: The amplitude ratio of a pure capacity process is inversely proportional to frequency
T
211
first industry plant
ammonia
212
father of chemical engineering
davis
