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Chemical Engineering
Chemical Engineering Basics
Quiz 13
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Q.1
Cold working of a material results in increase in hardness, which is termed as the __________ hardening.
Cold
Work
Age
Induction
Q.2
The increase in hardness of metal due to its cold working is termed as the __________ hardening.
Work
Age
Induction
Flame
Q.3
Rate of chemical reaction is not much affected, if the reactants are in __________ form.
Solids
Liquids
Either A or B
Gaseous
Q.4
In BOF, desiliconisation is a first order reaction. So the silicon content of the metal decreases
Linearly with time
Exponentially with time
Logarithmically with time
In proportion to the square root of time
Q.5
Cast iron compared to steel is better in
Ductility
Strength
Malleability
Fluidity & castability
Q.6
Tungsten in high speed steel is responsible for its
Toughness & wear resistance
Cold hardness
Hot hardness
Sharp cutting edge
Q.7
Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while the same for liquid nitrogen is - 210°C & - 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8
°C
°F
°K
°R
Q.8
Which of the following is the most effective inhibitor of grain growth, when added in small quantity in steel ?
Manganese
Vanadium
Cobalt
Copper
Q.9
Fibrous fracture is normally encountered in the __________ materials.
Hard
Elastic
Ductile
Brittle
Q.10
Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter.
Bomb
Throttling
Junker's
Boy's
Q.11
Pressure exerted by a liquid depends upon its
Surface tension
Density
Viscosity
Buoyancy
Q.12
Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)
A
L
A²
Both A & B
Q.13
Out of the following the refractive index is the highest for
Glass
Diamond
Brine
Kerosene
Q.14
Corrosion is
A physical phenomenon
A chemical phenomenon
Same as erosion
An uncontrollable phenomenon
Q.15
Aromatics are desired constituents of
Lubricating oil
Diesel
Kerosene
Petrol
Q.16
With increase in temperature, the electrical conductivity of semiconductors
Increases
Decreases
Remain constant
Either A or B, depends on the type of semi-conductor
Q.17
__________ is not used as a material of construction in thermocouples.
Alumel
Rhodium
Constantan
Duralumin
Q.18
Coarse grained steels have
Low toughness
No tendency to distort
High density
Very high toughness
Q.19
Colloids can be purified by
Dialysis
Reverse osmosis
Coagulation
Peptization
Q.20
Scab is a defect developed during __________ of metals.
Forging
Sand casting
Machining
Welding
Q.21
Compressed dry air is used as the cutting fluid, while machining
Steel
Cast iron
Aluminium
None of these
Q.22
The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the __________ allowance.
Casting
Pattern
Draft
Distoration
Q.23
Electrostatic separation of minerals from each other is based on their differences in the following property.
Densities
Magnetic permeabilities
Electrical conductivities
Hardness
Q.24
Which of the following manufacturing processes produces the strongest components ?
Forging
Cold rolling
Hot rolling
Die casting
Q.25
The product out from a cupola is called
Wrought iron
Pig iron
Cast iron
None of these
Q.26
The product out from a cupola is called
Wrought iron
Pig iron
Cast iron
None of these
Q.27
Force between the molecules of the same substance is called __________ force.
Adhesive
Cohesive
Molecular
Vander Walls
Q.28
The trace metal present in insulin is
Cu
Zn
Fe
Ni
Q.29
Ganister contains maximum percentage of
FeO
SiO₂
MgO
MnO₂
Q.30
An oxidation process is accompanied with decrease in the
Number of electrons
Oxidation number
Number of ions
All of the above
Q.31
A reduction process is accompanied with increase in the
Number of electrons
Oxidation number
Both A & B
Neither A nor B
Q.32
Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation
Pressure falls below the vapour pressure
Pressure becomes very high
Temperature becomes low
All of the above
Q.33
Tip of the match stick contains a mixture of
K + S
K + S + K₂Cr₂O₇
S + K₂Cr₂O₇ + White P
None of these
Q.34
Out of the following, the joint produced by __________ has the lowest strength.
Soldering
Welding
Brazing
Rivetting
Q.35
Corrosion rate can not be lowered by reducing the __________ of the corroding medium.
Concentration
Velocity
Temperature
None of these
Q.36
Powder metallurgy processing can be used for making
Dispersion strengthened copper rod
Self lubricating bearing and cemented carbide
Connecting rod
Piston
Q.37
The leg of a barometric leg pump is longer than the Toricellian leg, which is about __________ metres.
1
5
34
10
Q.38
Thermal shock produced by cooling is more dengerous/deleterious than that produced by heating a surface, because of the reason that
Cooling produces tension on the surface
Cooling produces compression on the surface
Heating does not produces any thermal stress
Heating produces compression on the surface
Q.39
Bad odour in sanitary latrines is reduced by periodically sprinkling
Bleaching powder
Lime powder
Aluminium sulphate
None of these
Q.40
Ceramic materials are
Organic in nature
Stronger in compression than in tension
Always amorphous in nature
Always bad heat conductors
Q.41
Ceramic compounds as compared to metallic compounds
Crystallise faster
Resist greater tensile stress at room temperature
Have higher melting temperature
Are better conductor of electricity at higher temperature
Q.42
A friction lighter is normally used for lighting gas welding torch, because of the reason that
Its initial cost is very low
Duration of spark created is very small
Safety of welder is ensured
It is easier to operate & maintain
Q.43
Gratings is associated with the measurement of
Linear displacement
Concavity/convexity
Surface texture
Flatness
Q.44
Nickel is a __________ material.
Ferromagnetic
Semi-conductor
Paramagnetic
Ferroelectric
Q.45
1% concentration of water vapor in air is equivalent to __________ ppm (parts per million).
10000
1000
100
10
Q.46
Measurement of the area of the indented surface is not involved in the __________ hardhes testing method.
Vicker's
Rockwell
Knoop
Brinell
Q.47
Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses.
Forging
Cold rolling
Hot rolling
Casting
Q.48
Water hammer is caused in steam carrying pipelines, because of
Partial condensation of steam
Vibration of the pipeline
High degree of superheat of steam
Its exposure to torrential rain
Q.49
__________ number determines whether the fluid flow in an open channel is supercritical, critical or sub-critical.
Mach
Reynolds
Froude
Weber
Q.50
Production of a hollow product by inflation of a tube or parison is called the __________ process.
Blow moulding
Calendering
Extrusion
Injection
0 h : 0 m : 1 s
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