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Chemical Engineering
Chemical Engineering Basics
Quiz 9
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Q.1
A balanced draught boiler furnace employs __________ draught fan.
Induced
Forced
Both A & B
Neither A nor B
Q.2
Maxwell's thermodynamic relations applies to the
Chemical systems in equilibrium
Mechanical systems in equilibrium
Irreversible thermodynamic processes
Reversible thermodynamic processes
Q.3
A dummy activity is used in PERT network to describe the
Precedence relationship
Resource idleness
Resource restriction
Necessary time delay
Q.4
__________ method of depreciation calculation ensures that the interest is charged on the cost of machine asset every year on the book value, but the rate of depreciation remains constant every year.
Annuity charging
Atraight line
Ainking fund
None of these
Q.5
Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.
1
10
30
45
Q.6
Joule-Thomson co-efficient is the ratio of
Pressure change to temperature change occuring during adiabatic compression of a gas
Pressure change to temperature change occuring during adiabatic throttling of a gas
Temperature change to pressure change occuring during adiabatic compression of a gas
Temperature change to pressure change occuring during adiabatic throttling of a gas
Q.7
The normal stress is the same in all directions at a point in a fluid, only when the fluid
Is at rest & has zero viscosity
Is frictionless
Fluid layer has no motion relative to an adjacent layer of fluid
Is incompressible & frictionless
Q.8
Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50 wt% B is
R ln 2
-R ln 2
3 R ln 2
-3R ln 2
Q.9
__________ of test specimens is not involved in any hardness testing method.
Fracture
Indentation
Wear
Scratch
Q.10
In spite of large heat transfer co-efficients in boiling liquids, fins are used advantageously, where the entire surface is exposed to __________ boiling.
Film
Nucleate
Transition
All of the above
Q.11
Maximum change in the hardness of mar tensite occurs in the carbon content range of __________ percent in steel.
0.01 to 0.10
0.2 to 0.4
0.5 to 0.7
0.8 to 1.0
Q.12
Eutectoid composition of carbon steel at room temperature is
Cementite
Pearlite
Martensite
Ferrite
Q.13
Percentage of argon (by volume) in dry atmospheric air is about
0.09
0.3
0.57
0.94
Q.14
Iron has got __________ isotopes.
No
Four
Three
Two
Q.15
Which of the following is an undesirable property of slag produced during the pyrometallurgical method of metal extraction from its ore?
High fusibility & fluidity
High thermal conductivity
Low density
High chemical activity
Q.16
Which of the following is a neutral flux used in the pyrometallurgy of metal extraction?
Quartz
Flourspar
Dolomite
Manganese ore
Q.17
The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as
Rigid
Tough
Ductile
Plastic
Q.18
The underground well of a biogas plant is called the
Septic tank
Oxidation well
Digestor
Lagoon
Q.19
Heat required to raise the temperature of a body by 1 °C is called its
Heat capacity
Specific heat capacity
Thermal conductivity
Water equivalent
Q.20
Sudden fall of atmospheric pressure by a large amount is an indication of the
Rain
Cold wave
Storm
Fair weather
Q.21
Addition of __________ to steel does not help in improving its machinability.
Sulphur
Silicon
Lead
Phosphorous
Q.22
Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be
9.5:1
12.5:1
15.5 :1
18.5 : 1
Q.23
Fog is an example of colloidal system of
Solid dispersed in gas
Solid dispersed in liquid
Liquid dispersed in gas
Gas dispersed in liquid
Q.24
Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.
0.8
7.8
200
10000
Q.25
The most abundant metal present in the earth's crust is;
Iron
Copper
Titanium
Aluminium
Q.26
The rolling process can not be used to produce
Plates
Rods
Tubes
Wires
Q.27
An alloy of Fe - 0.4 % C is
Cast iron
Hypo-eutectoid steel
Hyper-eutectoid steel
Eutectoid steel
Q.28
An ideal fluid is
Viscous & incompressible
Non-viscous & compressible
Non-viscous & incompressible
Viscous & compressible
Q.29
Good design of the casing of a centrifugal pump aims at minimising the
Cavitation
Frictional losses
Kinetic energy loss
Static head
Q.30
The maximum axial compression stress during cold upsetting of a cylinderical rod of radius (r) occurs at
The outer edge of the rod
R/3 from the centre
R/2 from the centre
The centre
Q.31
The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength.
Creep
Endurance
Fatigue
None of these
Q.32
Common salt is produced from sea water in India generally by the __________ method.
Freeze drying
Solar evaporation
Electrolytic
None of these
Q.33
Even though heat transfer co-efficients in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.
Film
Nucleate
Transition
All of the above
Q.34
A cylinderical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson's ratio of the rod is
0
0.33
0.44
0.25
Q.35
Lime contains about 90% CaO. Percentage CaO present in limestone is about
25
50
70
80
Q.36
Multistage compression of air as compared to single stage compression offers the advantage of
Power saving per unit weight of air delivered
Moisture elimination in the inter-stage cooler
Increased volumetric efficiency
All of the above
Q.37
Water hammer in pipelines results, when the flowing fluid
Has very high velocity
Has very high pressure
Is brought to rest by gradually closing a valve
Is suddenly brought to rest by closing a valve
Q.38
Wave length of X-rays is about 1 angstron, however it can not pass through a sheet of
Paper
Cloth
Lead
Aluminium
Q.39
Nuclear fission of one atom of uranium⁻²35 produces the energy equivalent to about __________ MeV.
20
200
500
1000
Q.40
Fahrenheit and Centigrade scales have the same readings at
-55°
-40°
-33°
-58°
Q.41
A solution which resists change in its pH value on addition of acid/alkali is called the __________ solution.
Neutral
Ideal
Buffer
Zero pH
Q.42
Work study deals with the __________ study.
Time
Motion
Both A & B
Neither A nor B
Q.43
Gage pressure within a spherical droplet of a fluid is 'p'. What will be gage pressure within a bubble of the same size & of the same fluid ?
p
2 p
0.5 p
0.25 p
Q.44
__________ is the most important element, which controls the physical properties of steel.
Manganese
Silicon
Carbon
Vanadium
Q.45
Friction factor for fluid flow in pipe does not depend upon the
Pipe length
Pipe roughness
Fluid density & viscosity
Mass flow rate of fluid
Q.46
Limestone addition in the blast furnace is done to flux __________ present in the raw materials.
SiO₂
Al2O₃
MnO₂
P
Q.47
The most detrimental impurity in high pressure boiler feed water is
Suspended salt
Dissolved salt
Silica
Turbidity
Q.48
Which of the following is capable of acting both as an acid flux as well as a basic flux in the metal extraction from its ore?
Silica
Lime
Alumina
Fluorite
Q.49
Larger length & diameter water pipes are made by
Electrical resistance welding
Die casting
Semi-centrifugal casting
Continuous casting
Q.50
Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the
Length of the pipe
Diameter of the pipe
Density of the fluid
Velocity of the fluid
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