Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

ChE LE Flashcards > ChECal > Flashcards

ChECal Flashcards

1
Q

A unit operation in which a soluble component is removed from an inert solid by a solvent which preferentially dissolves the soluble matter is known as

A

Leaching

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The unit operation by which soluble components of a liquid mixture are dissolved in a liquid immiscible with the insoluble component is

A

Solvent Extraction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Tea percolation employs

A

Leaching

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Leaching of sugar from sugar beets is done using

A

Hot water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

In a counter-current extractor, as the axial mixing increases, the extraction efficiency

A

Decreases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Bollman extractor is used for ____

A

extraction of oil from oilseed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Radioactive nuclear waste is treated in

A

Pulsed column extractor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Acetic acid will be most economically separated from a dilute solution of acetic acid in water by

A

Solvent extraction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Liquid-liquid extraction is based on the differences in ___

A

solubility

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Heats sensitive materials with very high latent heat of vaporization may be economically separated using ___

A

liquid extraction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Which method is more efficient, a single large washing or repeated small washing?

A

repeated small washing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Which of the following equipment is not used in liquid-liquid extraction?

A

Pachuka tank

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Heat sensitive materials with very high latent heat of vaporisation may be economically separated using

A

Liquid extraction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

The solvent used in liquid extraction should not have high latent heat of vaporization, because

A

Its recovery cost by distillation may be prohibitatively high

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

A

extracting solvent is cheaply & abundantly available.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

In a counter-current liquid extractor

A

only one of the liquids may be pumped at any desired rate.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

A coalescer in a mixer-settler liquid-liquid extraction column
a. comprises of thin bed of substances of extended surface
having high porosity.
b. helps in increasing the bubble size entering the settler.
c. helps in increasing the settling rate of the bubbles.
d. all of these

A

all of these

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Antibiotics are best handled in a
a. Podbielniak extractor
b. rotating disc contactor
c. sieve tray contractor
d. pulsed column extractor

A

Podbielniak extractor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Which of the following solutions will follow Raoult’s law most
closely?
a. A solution of benzene, toluene and oxylene
b. 35% solution of camphor in water
c. 35% solution of NH3 in water
d. A solution of polar organic compounds (not of homologs of a
series).

A

a. A solution of benzene, toluene and oxylene

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Boiling point diagram is
a. not affected by pressure.
b. affected by pressure.
c. a plot of temperature vs. liquid composition.
d. a plot of temperature vs. vapor composition.

A

b. affected by pressure.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q
  1. The ease of difficulty of separating components by distillation is
    determined by the
    a. relative volatility
    b. viscosity
    c. mole fraction
    d. weight fraction of the components
A

a. relative volatility

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Strictly speaking, the relative volatility of most ideal binary
solution is
a. not affected by temperature
b. greatly affected by temperature
c. slightly affected by temperature
d. greatly affected by pressure

A

c. slightly affected by temperature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

When the relative volatility of two miscible components is close to 1.00, the components can be separated by _____

A

c. extractive distillation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Distillation used for multicomponent systems like crude refining

A

Flash Distillation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

The physical separation of components in a miscible mixture by simultaneous evaporation and condensation is
a. absorption
b. drying
c. extraction
d. distillation

A

d. distillation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

In a batch distillation, the boiling point of the distillate product compared to the residue is
a. the same
b. higher
c. lower
d. half

A

c. lower

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

The temperature ____ as we go up the distillation column

A

decreases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

The section below the feed plate is called

A

Stripping section

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

Operating line that always lies below the equilibrium curve

A

stripping section

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

In a packed column, channeling is prevented by which of the following equipment?

A

Liquid distributor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Increasing the operating pressure of a distilling column
a. does not make a difference in components separation
b. makes separation difficult
c. sharpens separation
d. requires less heat in the feed heater

A

b. makes separation difficult

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

One mole feed of a binary mixture of a given composition is flash vaporized at a fixed P and T. If Raoult’s law is obeyed, then changing the feed composition would effect
a. the product composition but not the fraction vaporized.
b. the product composition as well as the fraction vaporized.
c. the fraction vaporized but not the product composition.
d. neither the product composition nor the fraction vaporized.

A

C. The fraction vaporised but not the product composition

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

Steam distillation is used to
a. reduce the number of plates.
b. avoid thermal decomposition of a component.
c. increase the efficiency of separation.
d. increase the total pressure of distillation.

A

b. avoid thermal decomposition of a component.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by
a. raising the temperature
b. lowering the total pressure
c. both (a) and (b)
d. neither (a) nor (b)

A

c. both (a) and (b)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

In distillation, the cooled liquid stream returned to the column to a cool plate or stage is called
a. reboil
b. reflux
c. feed
d. bottoms

A

b. reflux

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

In a distilling column, the highest pressure will be at
a. the top
b. the bottom
c. the feed plate
d. between the feed plate and the top

A

b. the bottom

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

A heat transfer equipment to convert vapor to liquid is a/an
a. evaporator
b. reboiler
c.condenser
d. still

A

c.condenser

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

A reboiler provides heat to the
a. top
b. the feed
c. the intermediate reflux
d. the bottom of a distilling column

A

d. the bottom of a distilling column

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

The temperature in distilling column, from bottom to top
a. increases
b. maximum
c. decreases
d. between minimum & maximum

A

a. decreases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

The theoretical minimum reflux ratio in distillation column is
attained if the column has
a. 1 plate
b. 10 plates
c. 100 plates
d. infinite number of plates

A

d. infinite number of plates

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

If x co-ordinate of intersection point of feed line and rectifying sections operating line on equilibrium curve is same as the mole fraction of more volatile components in the feed, then the quality of feed is
a. subcooled liquid
b. saturated vapor
c. saturated liquid
d. superheated vapor

A

c. saturated liquid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

As the reflux ratio decreases, the
a. separation becomes more efficient.
b. number of plates increases.
c. column diameter increases.
d. none of these.

A

number of plates increases.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

In a distillation column, with increase in the reflux ratio, the heat
removed in the cooler _____

A

increases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

Fenske’s equation for determining the minimum number of theoretical stages in distillation column holds good, when the ____

A

relative volatility is reasonably constant.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

Inside the distillation column, the ____
a. driving force for the vapor flow is the pressure drop.
b. liquids are not always at their bubble points.
c. pressure increases gradually from bottom to the top of the column.
d. none of these

A

driving force for the vapor flow is the pressure drop.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in ___

A

increased reflux ratio

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

In case of binary distillation, increasing the reflux ratio above optimum does not result in the increase of _____

A

area between operating line and 45° diagonal x-y diagram

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

Overall efficiency of the distillation column is equal to ____

A

the ratio of number of ideal plates to actual plates

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

Design calculation for multiple component distillation is done by ____

A

tray to tray calculations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

Pick out the wrong statement:
a. Reboiler is not used in open steam distillation.
b. The separation of solutes of different molecular sizes in a liquid solution by use of a suitable membrane is called dialysis.
c. Freeze drying is used for the drying of fish.
d. Fenske-Underwood equation is used for calculating theoretical number of plates in a distillation column at normal operating reflux
condition.

A

Fenske-Underwood equation is used for calculating theoretical number of plates in a distillation column at normal operating reflux
condition.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

In extractive distillation, solvent is used to ____

A

added to alter the relative volatility of the mixture.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

In case of __________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated.

A

Extractive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

Solvent used in extractive distillation forms ____

A

forms a low boiling azeotrope.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
54
Q

Pick out the wrong statement.
a. Critical moisture content is not a property of the material itself.
b. A sharp increase in pressure drop gives an indication of the flooding in a distillation column.
c. Separation of components is not possible in liquid extraction, if selectivity is unity.
d. Dehydration of ethyl alcohol is most economically done by molecular distillation at very high vacuum.

A

Dehydration of ethyl alcohol is most economically done by molecular distillation at very high vacuum.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
55
Q

The equilibrium liquid composition compared to the vapor composition in case of azeotropic mixture is

A

same
(SAME AND ISASAGOT HINDI EQUAL)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
56
Q

Pick out the wrong statement.

a. The mole fraction of solute is directly proportional to the molality of a ‘dilute’ solution.
b. For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is nonlinear in the case of steady state unimolal unidirectional diffusion.
c. Azeotropes obey Raoult’s law at all temperature.
d. The relative volatility of a binary mixture at the azeotropic composition is 1.

A

Azeotropes obey Raoult’s law at all temperature.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
57
Q

Azeotropic distillation is employed to separate ____.

A

constant boiling mixture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
58
Q

Pick out the system with minimum boiling azeotrope at 1 atm.
A. Benzene-toluene
B. Ethyl alcohol-water
C. Hydrochloric acid-water
D. All of the above

A

Ethyl alcohol-water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
59
Q

Which of the following binary systems is an example of a maximum boiling azeotrope?
A. Water-hydrochloric acid
B. Acetone-carbon disulphide
C. Water-ethyl alcohol
D. N-heptane-n-octane

A

Water-hydrochloric acid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
60
Q

Ponchan-Savarit method analyses the fractional equipment based on

A

enthalpy and material balances

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
61
Q

This phenomenon occurs in a fluid flow system when the local static pressure drops below the vapor pressure of the liquid at
the existing temperature, resulting to damage to pumps and control valves from the formation of “bubbles” or voids.

A

Cavitation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
62
Q

It is a membrane separation process where a component from a heated liquid phase permeates through the membrane and is removed under low pressure.

A

Pervaporation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
63
Q

A process where components are separated from each other using a semi-permeable membrane by virtue of their different diffusion rates through the membrane is referred to as

A

Dialysis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
64
Q

Floating head heat exchangers are used for

A

cases where temperature difference between the shell and the tubes is more
(>50 C)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
65
Q

In double pipe (concentric heat exchanger), the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be ___

A

more than that for fluid flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
66
Q

Oxygen %wt in atmospheric is

A

23

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
67
Q

Preheating of gaseous fuel results in increased

A

Flame Temperature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
68
Q

Production of sulfuric acid based on oxidation of sulfur to sulfur trioxide on a vanadium oxide catalyst

A

Contact Process

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
69
Q

A disproportionation reaction of two aldehyde molecules to give an alcohol and a carboxylic acid

A

Canizzaro reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
70
Q

It is the solid , cellular, infusible material remaining after the carbonization of coal, pitch, petroleum residue and certain other carbonaceous materials.

A

coke

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
71
Q

Inorganic residue that remains after the coal has been burned. Composed of silicon, aluminum, iron and Calcium. Also, compounds of magnesium, sodium, potassium and titanium are also present in minor amounts.

A

Ash

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
72
Q

It is the portion of the coal which when heated ion the absence of air under prescribed conditions is liberated as gases or vapors

A

volatile matter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
73
Q

The gas generated by blasting a deep, hot bed of coal or coke continuously with a mixture of air and steam

A

producer gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
74
Q

A mixture of hydrogen and carbon monoxide produced by the reaction of water and carbon (coke) that is used as a starting point in the synthesis of methanol and other organic chemicals

A

Synthesis gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
75
Q

It converts solar energy into electricity directly

A

photovoltaic cell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
76
Q

An amorphous carbon that has been treated with steam until it has a great affinity for adsorbing many materials

A

Activated carbon

77
Q

Dry air requirement for burning 1 ft3 for CO to CO2 may be around

A

2.4 ft3

78
Q

Which of the following is an ore of mercury?

A

cinnabar

79
Q

Lanolin is widely used in cosmetics, it is derived from _____

A

sheep’s wool

80
Q

Other term for earthwax

A

Ozocerite

81
Q

Process for the production of sodium carbonate from sodium chloride and calcium carbonate

A

Solvay

82
Q

An early method for the production of sodium carbonate in which SO2 is oxidized to SO3 by nitrogen oxides in lead-lines chambers

A

Lead chamber process

83
Q

An industrial process for the purification of aluminum (III) oxide through its selective dissolution in a strongly basic solution

A

Bayer process

84
Q

Which of the following is true if the resulting combustible lost in refuse is coked coal?

A

has lost both moisture and VCM content

85
Q

A gaseous fuel in order to develop luminosity on burning must contain

A

hydrocarbons

86
Q

Which of the following is the most impotant deterrent in the extended use of pulverized coal in boiler firing?

A

ash disposal problem

87
Q

The ejection of electrons from a metal surface by beam of light. The energy of electron depends upon the wavelength of the light.

A

photoelectric effect

88
Q

Combined water is equal to

A

oxygen in the fuel

89
Q

A solution contaning equimolal O2 and N2 is passed through a membrane to separate O2 from N2. The final product is found to contain 45% O2 and 55% N2. Find the %O2 remaining if only 20% of the original solution passed through the membrane

A

51%

90
Q

An industrial process for the manufacture of ammonia from nitrogen and hydrogen with a catalyst at elevated temperature and pressure

A

Haber Bosch process

91
Q

Which of the following metals is used as catalyst for the Haber-Bosch process of producing ammonia from nitrogen and hydrogen
gas?

A

Iron

92
Q

A process used in paper production in which sulfur dioxide is added to a mildfly acidic digestion liquid to

A

sulfate process

93
Q

Comparing sulfate process with sulfite process, we find that ___

A

T and P of sulfate process is greater than sulfite process

94
Q

It is a by-product of the destructive distillation or pyrolysis of coal which is a mixture of many chemical compounds, mostly aromatic, which vary widely in composition

A

coal tar

95
Q

A process for the conversion of iron to steal that consist of forcing air through molten pig iron

A

Bessemer process

96
Q

Refers to the outgoing stream of noncombustible matter (ash) which separated from the materials that can be gasified

A

refuse

97
Q

Refers to the outgoing stream of noncombustible matter (ash) which separated from the materials that can be gasified

A

refuse

98
Q

Ore of Iron

A

hematite

99
Q

Contact process when compared to chamber process for sulphuric acid manufacture

A

Yields higher concentration

100
Q

Deaeration of water in its treament is necessary as it

A

Minimizes its corrosiveness

101
Q

Dechlorination of treated water is necessary to

A

Remove chlorinous taste

102
Q

Metallic soap is _____ salt of fatty acids

A

aluminum or calcium

103
Q

20% oleum means that in 100 kg oleum, there are 20 kg of

A

SO3 and 80 kg H2SO4

104
Q

Catalyst used in the manufacture of sulphuric acid by chamber and contact processes are respectively

A

Oxides of nitrogen & V2O5 on a porous carrier

105
Q

This system usually encloses the device that involves mass flow such as compressor, turbine or nozzle

A

open system

106
Q

Common microorganism used in penicillin production

A

mold

107
Q

As the pipe diameter increases, the pumping cost

A

decreases

108
Q

Industrial process for making hydrazine from ammonia

A

Raschig process

109
Q

Ore of lead

A

galena

110
Q

Most common baffle for shell and tube

A

25% cut segmental baffle

111
Q

The minimum baffle height should be

A

twice the impeller diameter

112
Q

Joint efficiency of seamless pipe

A

1.0

113
Q

Ability of coal to withstand breakage

A

size stability

114
Q

Which of the following is corundum?

A

aluminum oxide

115
Q

Rectified spirits contains

A

95.6% alcohol

116
Q

Percent kryption in air

A

0.0001139% by volume

117
Q

Chemical formula of blue vitriol

A

CuSO4*5H2O

118
Q

Chemical formula of saltpeter

A

Potassium nitrate, KNO4

119
Q

Produced by reaction of calcium carbide with water

A

acetylene

120
Q

Prussian blue

A

Ferric ferrocyanide

121
Q

Calcite is

A

calcium carbonate

122
Q

Commonly called niter cake

A

sodium bisulfate

123
Q

Lime and soda ash are added to water to remove

A

bicarbonates and sulfates of calcium and magnesium

124
Q

U

A

s

125
Q

Which of the following compound is employed extensively in the leather industry as a depilatory?

A

sodium sulfide

126
Q

Used to dissolve unaltered silver halogen compounds in negatives and prints

A

sodium thiosulfate

127
Q

The ratio propeller agitator diameter to tank diameter is

A

0.15-0.30

128
Q

In the case of s shell and the tube heat exchanger, the logarithmic mean temperature difference is_____

A

always less than arithmetic

129
Q

Calcite is

A

calcium carbonate

130
Q

Pearl ash chemical formula

A

K2CO3

131
Q

Most common standard size of bubble caps

A

6” diameter with 4” diameter riser

132
Q

In the design of a paddle agitator the ratio paddle agitator to tank diameter

A

0.8

133
Q

Used as a disinfectant and deodorant in dairies, creameries, water supplies

A

sodium hypochlorite

134
Q

The union of nonvolatile inorganic oxides resulting from the decomposition and fusion of alkali and alkaline earth compounds

A

glass

135
Q

Glass that does not break when heated and then cooled

A

Tempered glass

136
Q

The minimum plate spacing in most of the petroleum refinery distillation columns (if diameter 73 ft) is normally

A

18”

137
Q

Comprises of a group of composite materials consisting of an intimate mixture of ceramic and metallic components, usually in the form of powder

A

cements

138
Q

A product of alumina and silica at high temperature.

A

kaolinite

139
Q

Twenty-five percent cut segmental baffle means that

A

the baffle height is 75% of the ID of the shell

140
Q

In shell and tube heat exchanger, the clearance of the tube is generally

A

not less than one-fourth of the tube diameter or 3/16

141
Q

Alloy of zinc and copper

A

brass

142
Q

The ratio propeller agitator diameter to tank diameter is

A

0.15-0.30

143
Q

Process for the production of aluminum through electrolysis of a solution of bauxite in molten cryolite

A

Hall-Heroult process

144
Q

Multistep cyclic process in which pyruvate ions are broken down to carbon dioxide and water with production of atp nadh and fadh2

A

Citric acid cycle

145
Q

A multistep cyclic process in which glucose is synthesized from carbon dioxide and water

A

Calvin cycle

146
Q

Electrochemical process for obtaining sodium from molten sodium chloride

A

Downs process

147
Q

Process in which sulfur is recovered from underground deposits by melting it with superheated water

A

Frasch process

148
Q

Process used in paper production in which SO2 is added to yield hydrogen sulfite

A

Sulfite process

149
Q

Neoprene is a

A

synthetic rubber

150
Q

Partially decomposed plant matter that has accumulated underwater or in a water-saturated environment

A

Peat

151
Q

Gas containing saturated paraffin hydrocarbons

A

Natural gas

152
Q

The function of transducer is

A

Convert the primary signal into more useful quantity

153
Q

A type of Portland cement that contains tricalcium silicate and dicalcium silicate.

A

Low Heat Cement

154
Q

Stages of Design

A
  1. Possible design
  2. Plausible/ Feasible design
  3. Probable design
  4. Best design
155
Q

Skirt supports are most suitable for:

A

Tall vertical vessels

156
Q

Saddle supports are most suitable for:

A

Horizontal vessels

157
Q

A disturbance which is externally applied to the system.

A

Perturbations

158
Q

What is the simplest type of control commonly expressed as having on/off position action?

A

Bang-Bang

159
Q

A control strategy where a primary controller, which controls the ultimate measurement, adjusts the setpoint of a secondary controller.

A

Cascade control

160
Q

It is a control system used for multi-input and multi-output system.

A

Model predictive control (MPC)

161
Q

Also known as design factor

A

Safety Factor

162
Q

This dimensionless number relates buoyancy forces to viscous forces.

A

Grashoff number

163
Q

In feedback control system for temperature control, a thermocouple measures the temperature and the output is fed to a controller. What results when one of the components known as a comparator compares a measured temperature value with desired value or set point?

A

Error

164
Q

In agitation, which among the following will not prevent swirling or the formation of a vortex?

A

Installing baffles in the tank

165
Q

The primary consideration in the selection of a dryer is:

A

Physical properties of the material to be dried

166
Q

It is most efficient process for hydrogen gas production which emits less amount of carbon.

A

Steam reforming

167
Q

Other name of Yamatake system

A

Azbil

168
Q

Used in ultrasonic flowmeters

A

Doppler

169
Q

Which equipment is non-proprietary?
-Distilling column
-Centrifuge
-Pumps
-Compressors

A

Distillation Column
(rest are proprietary or exclusive rights under manufacture)

170
Q

When is partial condenser used in distillation?

A

If MVC have low boiling point, hence total condensation is difficult

171
Q

In this distillation process the feed fluid is pressurized and heated and is then passed through a throttling valve or nozzle into a flash drum.

A

Flash / Equilibrium distillation

172
Q

In this type of distillation, the still pot containing the mixture is heated and boiled slowly.
The vapor is withdrawn as soon as it is formed and is condensed to form the distillate.

A

Batch/Rayleigh Distillation

173
Q

This type of distillation is used when the MVC has a high normal boiling temperature and is immiscible with water.

A

Steam Distillation

174
Q

Rose oil is extracted from rose leaves using _____ distillation

A

Steam Distillation

175
Q

when the solvent dissolves very little of solute then ____

A

large quantity of solvent is required to extract the solute

176
Q

Flash distillation is the separation of components having ____

A

having very wide boiling points

177
Q

Leaching of course solid lumps is also termed as ____

A

percolation

178
Q

Relative volatility of a binary mixture is the ratio of vapor pressure of component A to that of component B when ____

A

Vapor phase obeys Dalton’s Law.
Liquid phase obeys Raoult’s Law

179
Q

Large-scale uses of flash distillation is practiced in _____

A

petroleum refining

180
Q

In an operating distillation column, ______ (describe driving forces)

A

driving force for the vapor flow is the PRESSURE DROP as the pressure decreases gradually from the bottom to the top of the column.

181
Q

It is the first stage in the anatomy of a chemical manufacturing plant.

A

Raw Material Storage

182
Q

Which among the following is not an exothermic process?
A. Methanol synthesis
B. Catalytic cracking
C. Oxidation of sulfur
D. Ammonia synthesis

A

Catalytic cracking

183
Q

When designing a reactor what must be considered in searching for the optimum efficiency?

A

Economics of the overall process

184
Q

What is the main goal of Chaddock who defined design as the conversion of an ill-defined requirement?

A

satisfied customer

185
Q

In setting to optimize the engineering design of a system, what is considered as the overall objective in a chemical processing plant?

A

Maximize profits per unit time

186
Q

Describe Analyses for Solid Fuels

A

Modified: M,C,net H,N,S,CW,Ash
VCM: C@VCM, net H, N, S, CW
Proximate: M, VCM, FC, Ash
Ultimate: C,H,O,N,S,Ash

187
Q

Describe Orsat Analysis

A

CO2: potassium hydroxide KOH
Pyrogallol: O2
CO: cupric chloride

188
Q

Ores:
Iron
Lead
Mercury
Aluminum
Uranium

A

Iron: Hematite
Lead: Galena
Mercury: Cinnabar
Uranium: Cleveite
Aluminum: Bauxite

189
Q

Proximate Analysis:
Composition, Temperature and Time

A

M : 1 hr 104-110C
VCM : 7 mins 900C
FC : 2 hrs 500-815C
Ash : remaining

ChE LE Flashcards (20 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions