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Chemical Engineering Basics
Quiz 12
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Q.1
A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material?
Steel
Glass
Rubber
Brass
Q.2
Steel produced from phosphatic iron is __________ in nature.
Malleable
Ductile
Brittle
Tough
Q.3
Swaging is a/an __________ operation.
Piercing
Forging
Extrusion
Drawing
Q.4
__________ is not a case hardening process.
Carburising
Nitriding
Cyaniding
Annealing
Q.5
The approximate height of a blast furnace having a useful volume of 2000 m³ is about __________ metres
25
35
55
75
Q.6
Materials used for making permanent magnets containing iron and nickel are made by __________ technique.
Powder metallurgy
Casting
Forging
None of these
Q.7
Shaft/rotor speed is most accurately measured by a
Frequency counter
Tachometer
Strobometer
Speedometer
Q.8
Which of the following phenomenon/ phenomena is/are diffusion controlled ?
Dislocation climb
Cross-slip
Twinning
Recrystallisation
Q.9
On increasing the yield strength of a steel from 450 to 650 MPa, its __________ will increase.
Ultimate tensile strength (UTS)
Modulus of toughness
Percent elongation
Modulus of resilience
Q.10
Thermal efficiency of an internal combustion engine is around __________ percent.
8
35
65
80
Q.11
Pick out the wrong statement
Processing of themosetting plastics is ideally done by injection moulding
Processing of thermoplastics is ideally done by compression moulding
Mass production of seamless pipes are done by electrical resistance welding (ERW)
Stretch forming is a process of cold drawing
Q.12
Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating.
Cementite
Austenite
Martensite
Pearlite
Q.13
Frost formation on the evaporator tubes in the domestic refrigerators
Can be prevented by proper design
Decreased compressor power
Causes heat loss due to poor heat transfer
Is immaterial
Q.14
Milk is fat dispersed in water. It is an example of
Suspension
Emulsion
Gel
Solution
Q.15
__________ is the most suitable lubricant for drawing mild steel wires?
Kerosene
Water
Sodium stearate
Lime water
Q.16
Maraging steels derive their strength from the following mechanism:
A fine, highly dislocated and strong martensite
Fine dispersions of intermetallics of Fe, Ni, Ti etc
Fine dispersions of alloy carbides in a ferrite matrix
Fine dispersions of Fe₃ C nucleated on dislocations in austenite
Q.17
__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.
Lancing
Shot peening
Slugging
Spinning
Q.18
Hydrogen in liquid steels is dissolved
As tiny gas bubbles
In the atomic form
In the ionic form
In the molecular form
Q.19
For the irreversible reaction, C
a
+ 2C = C
a
C₂ , Δ H°298 = - 60000 J . mole⁻¹ . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be
30000 J
60000 J
90000 J
240000 J
Q.20
__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.
Beryllia
Zirconia
Alumina
Magnesia
Q.21
Tempering of a material does not improve its
Machinability
Toughness
Internal stress level
Softness
Q.22
With increase in steam pressure, its specific volume decreases
Rapidly first and then slowly
Linearly
Slowly first and then rapidly
Exponentially
Q.23
The velocity of sound in air is independent of changes in its
Humidity
Pressure
Temperature
None of these
Q.24
The most important material handling system in an integrated steel plant is the
Belt conveyor
Diesel locomotive
Truck
Overhead hoists & cranes
Q.25
Ignition of fuel in a diesel engine is by
Spark
Hot compressed air
Fuel injection
None of these
Q.26
Blast furnace slag is mainly molten
Sand
Magnesium silicate
Calcium silicate
Iron pyrite
Q.27
Laser welding is widely employed in the __________ industries.
Electronic
Structural
Process
Heavy
Q.28
Air refrigeration cycle is used in the air crafts, because of
Low temperature encountered at high altitude
Its high heat transfer rate
Its low unit weight per ton of refrigeration
Its higher co-efficient of performance (COP)
Q.29
Which of the following contributes maximum as main source of sulphur in the blast furnace charge ?
Sinter
Coke
Iron ore
Limestone
Q.30
Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are
Cobalt, chromium & tungsten
Cobalt, chromium & nickel
Molybdenun, tungsten & chromium
Cobalt, zirconium & molybdenum
Q.31
Which of the following welding processes employs the highest welding temperature ?
Arc welding
Gas welding
Thermit welding
Resistance welding
Q.32
In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is
More
Less
Equal
Much more
Q.33
Titanium alloys are welded using the Following process:
TIG welding
Submerged arc welding
Butt welding
Electron beam welding
Q.34
Salvage value is the most flexible criteria for analysing a financial investment. 'Salvaging' means
Disposing off a machine/property on as is where is basis
Disposing off machine/property, which is no longer useful in the present scenerio
Mortgaging the obsolete machine/property
Writing off the obsolete machine/ property
Q.35
Paint spray gun works on the principle of
Bernoulli's theorem
Boyle's law
Newton's law of viscosity
None of these
Q.36
Classification of metal forming processes into hot and cold working is based on the following parameters.
Stacking fault energy
Recrystallisation temperature
Solidus temperature
Transformation temperature
Q.37
Working of linear variable differential transducer (LVDT) is based on the principle of variable
Capacitance
Resistance
Mutual inductance
None of these
Q.38
Wood is a/an __________ material.
Amorphous
Cellular
Homogeneous
Grannular
Q.39
Lead is most readily dissolved in
Acetic acid
Hydrochloric acid
Nitric acid
Sulphuric acid
Q.40
Puddling process is used for converting pig iron into
Cast iron
Wrought iron
Mild steel
Semi-steel
Q.41
Which of the following is a boiler accessory i.e., not a boiler mounting ?
Blow off cock
Feed check valve
Feed water pump
Stop valve
Q.42
The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the
Work hardening
Bauschinger effect
Creeping effect
Stress recovery effect
Q.43
Ester is formed, when an alcohol reacts with
Carboxylic acid
Aldehyde
Ketone
Ether
Q.44
Silicon percentage in acid resistant cast iron is about
4
8
14
20
Q.45
Pick out the wrong statement.
A soft magnetic material should have high permeability and small area of hysterisis loop
Poisson's ratio of high melting point metals is more than unity
Solders generally melt at less than 185°C
Steel produced by B.O.F process is ideally suited for manufacturing flat product
Q.46
Holes in a plate for rivetted joints is preferably made by
Drilling
Tapping
Reaming
Punching
Q.47
Hard magnetic materials have high
Coercive force
Residual magnetic induction
Both A & B
Neither A nor B
Q.48
Between 230 and 370°C, blue brittleness is caused in mild steel because of the
Immobility of dislocation
Strain-ageing
Increase in Young's modulus
Strain hardening
Q.49
Metal shots used in shot blasting are made of
Stellite
Steel
Bronze
Lead
Q.50
A jet engine turbine blade is normally manufactured by
Forging
Shell moulding
Investment casting
Pressure die casting
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