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Chemical Engineering Basics
Quiz 8
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Q.1
An orthotropic material is a special class of anisotropic material, which is described by their properties in three perpendicular directions. An example of orthotropic material is
Stainless steel
Cast iron
Wood
Teflon
Q.2
The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment.
0.2
0.4
0.6
0.8
Q.3
Piezoelectric is a material
Whose properties is midway between the constituent materials
Which gets polarised, when stressed
In which magnetising force reduces when current flowing through it is in-cresed
Which changes dimensions due to applied field
Q.4
Pig iron is
Made from cast iron
Made from wrought iron
The one, which comes out of the blast furnace
Free from impurities
Q.5
Pig iron is a product of
Electric arc furnace
Cupola
Blast furnace
Open hearth furnace
Q.6
Shrinkage allowance on pattern is provided to compensate for shrinkage when the
Metal changes from liquid state to solid state at freezing temperature
Solid phase temperature drops from freezing temperature to the room temperature
Liquid metal temperature drops from pouring temperature to room temperature
Liquid metal temperature drops from pouring temperature to freezing temperature
Q.7
Out of the following, the alloy which has equal percentage of constituents, is
White metal
Gun metal
Duralumin
Constanton
Q.8
The instrument based on the following principle is used for the measurement of oxygen only in the flue gases.
Chemical absorption
Thermal conductivity
Infrared absorption
Paramagnetism
Q.9
Colour comparator is used to measure the
PH value
Electrode potential
Colour intensity
None of these
Q.10
The joint for soldering is supported by binding wire made of
Mild steel
Copper
Soft iron
Stainless steel
Q.11
An approximately __________ process exemplifies the flow of a gas through a very long pipe of uniform cross-section.
Adiabatic
Isothermal
Isentropic
Isochoric
Q.12
Pick out the wrong statement.
Annealing twins are not observed in pure aluminium, because it has higher strain energy
Load during cold rolling can be lowered by the application of front tension
Very fine grain structure is desirable for high temperature creep application of materials
Soft magnetic materials are those which have less area within the hysterisis loop
Q.13
The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe)
A
D
1
/
A
1
/
A²
Q.14
Sewage is not an excellent medium for the growth of
Aquatic creatures
Protozoa
Virus
Pathogenic bacteria
Q.15
Which of the following is not an ore of zinc?
Cerrusite
Franklinite
Calamine
Troosite
Q.16
Stellite is a __________ material.
Ferrous
Ceramic
Cemented carbide
Non ferrous cast alloy cutting tool
Q.17
Maximum hardenability of steel depends upon its
Chemical composition
Carbon content
Grain size
Alloying elements content
Q.18
Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at
High vacuum
Zero pressure
0°K
Earth
Q.19
Ammonia gas can be dried by
PCl₅
Quick lime
CaCl₂
Concentrated H₂SO₄
Q.20
Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay.
Atoms
Neutrons
Nucleons
Electrons
Q.21
In which of the following reactions, application of vacuum will help ?
Number of gas molecules in the product side is more than that on the reactant side
Number of gas molecules in the reactant side is more than that on the product side
Number of gas molecules are the same on both the reactant & the product side
None of the above
Q.22
Corona discharge is related to the operation of a/an
Induction motor
Electrostatic precipitator
Fast breeder reactor
Magneto hydrodynamic generator (MHD)
Q.23
Thermal equivalent of electrical power in practical calculation is __________ kcal/kWh.
746
3000
1000
550
Q.24
Light year is the unit of
Distance
Time
Intensity of light
None of these
Q.25
Minimum number of members required to form a Public Limited Joint Stock Company is
7
10
12
17
Q.26
Which of the following is a commonly used manometric liquid for low pressure range?
Ethyl alcohol
Carbon tetrachloride
Glycerol
Ethylene glycol
Q.27
__________ strain gauge is the most sensitive sensing element for strain measurement.
Photoelastic
Semiconductor
Wire resistance
None of these
Q.28
Acetylene should never be conveyed through __________ pipe, as it forms an unstable compound that dissociates violently at the slightest shock.
Stainless steel
Copper
Aluminium
Brass
Q.29
Upto the critical radius of insulation, added insulation, will
Increase the heat loss
Decrease heat loss and will have no effect beyond that
Decrease heat flux
Reduce convection heat loss compared to conduction heat less
Q.30
For grinding of softer materials, the grinding wheel should have __________ grain size.
Finer
Coarser
Medium
Any type of
Q.31
Chromium molybdenum steel can not be welded using __________ welding.
Thermit
Electrical resistance
Oxy-acetylene
Any of these
Q.32
The thermal efficiency of a heat engine giving an output of 4 KW with an input of 10000 Joules/sec is __________ percent.
40
80
10
25
Q.33
Hardness & tensile strength of austenitic stainless steel can be increased by
Martempering
Cold working
Normalising
Hardening
Q.34
In troposphere (the weather domain), the temperature 't' at height 'h' above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
T = 15 - 0.0065 h
T = 15 + 0.0065 h
T = 0.0035 h - 15
T = 15 - 0.0035 h
Q.35
Titanium can be easily welded using __________ welding.
Submerged arc
TIG
Shielded metal arc
Electroslag
Q.36
The most suitable material for die casting is
Iron
Copper
Steel
Nickel
Q.37
Which of the following is not found in iron-carbon equilibrium diagram?
Curie point
Peritectic point
Eutectic point
Eutectoid point
Q.38
Heating of an ore below its melting point in presence of excess of air is called
Calcination
Smelting
Roasting
Sublimation
Q.39
Lead pencil contains
Graphite
Lead sulphide
Lead
Both B & C
Q.40
The refractory lining of the bottom in a basic electric arc furnace is made of
Silica
Alumina
Magnesia
Fireclay
Q.41
Maximum permissible sulphur content in steel is __________ percent.
0.015
0.055
0.505
0.805
Q.42
Prandtl mixing length in turbulent flow signifies the
Average distance perpendicular to the mean flow covered by the mixing particles
Wavelength corresponding to the lowest frequency present in the flow field
Ratio of mean free path to characteristic length of the flow field
Magnitude of turbulent kinetic energy
Q.43
Alloying elements present in Hayness stel-lite, which has superior performance than high speed steel, are
Nickel, cobalt & chromium
Tungsten, chromium & cobalt
Manganese, chromium & cobalt
Tungsten, molybdenum & nickel
Q.44
When the weight of a ball inside the ball mill is just balanced by the centrifugal force,
The ball abandons its circular path for a parabolic path
The ball abandans its parabolic path for a circular path
The ball continues to move on a circular path
The ball continues to move on a parabolic path
Q.45
In TIG welding, thoriated tungsten electrodes are used, because it
Has higher current carraying capacity
Has better electron emissivity
Is stronger than ordinary tungsten
Is easy to prepare
Q.46
__________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C.
Vaneering
Galvanising
Electroplating
Calorising
Q.47
The concentration of (H⁺) ions is 4 x 10⁻⁵ in a solution. Then pH of the solution will be (Given log 4 = 0.6 )
4.4
5.6
8.4
2.4
Q.48
Density in the solid state is slightly less than that in its liquid state, in case of
Carbon dioxide
Water
Mercury
None of these
Q.49
On an average __________ fast neutrons are produced by nuclear fission of each atom of uranium⁻²35.
1
2.5
3.5
5
Q.50
Electrode potential is not concerned with the measurment of
PH value
Temperature
Viscosity
Density
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