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Chemical Engineering
Chemical Engineering Basics
Quiz 6
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Q.1
Moist climate is the most favourable factor in the site selection far a
Steel plant
Textile factory
Petroleum refinery
Coke oven battery
Q.2
__________ wire is never used for making the heating element.
Nichrome
Kanthal
Invar
None of these
Q.3
Basic open hearth furnace (BOF) is not used for producing __________ steel.
Killed
Rimming
High alloy
None of these
Q.4
Which of the following is prone to cup and cone fracture?
Cast iron
Soft brass
Round specimen of ductile metal
Flat tensile specimen of ductile metal
Q.5
In the diving apparatus, helium is used along with oxygen, because it is
Easily available
Not soluble in blood at high pressure
Lighter than nitrogen
Completely miscible with oxygen
Q.6
Sudden immersion/dipping of red hot steel bar in water makes it
Malleable & tough
Ductile & soft
Brittle & hard
None of these
Q.7
Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m² of steel strip.
5-10
1000-1500
120-500
1500-3000
Q.8
__________ is used as a material of construction for the blade of power saw.
Wrought iron
Stainless steel
Mild steel
High speed steel
Q.9
The most important consideration in value engineering is the
Profit maximisation
Customer satisfaction
Cost reduction
Process improvement
Q.10
Refrigerative cooling employed during long distance transportation of food stuffs is normally done by
Ice
Liquid nitrogen
Liquid oxygen
Vacuum evaporation
Q.11
Machine tool bodies are usually made of
Cast iron
Mild steel
Wrought iron
Copper alloys
Q.12
Increase in the entropy of a system represents the
Degradation of energy
Decrease in system pressure
Increase in the availability of energy
Increase in the temperature
Q.13
Cupola produces __________ iron.
Pig
Cast
Wrought
Carbon free
Q.14
Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used?
Vapour locking
Hot starting
Spark plug fouling
All of the above
Q.15
All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in which neutron is absent.
Deuterium
Hydrogen
Neon
Helium
Q.16
An abrupt and sudden fall in the readinp of barometer is an indication of the
Storm
Rain
Clear weather
Cold wave
Q.17
The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.
0.5
3
10
25
Q.18
Stress and strain are related by __________ elastic constants for a linearly elastic, homogeneous & isotropic material.
One
Two
Three
Four
Q.19
Pick out the wrong statement.
Reflectivity of gases is very low
Absorptivity for metals is very high
Reflectivity for non-conducting materials is low
Reflectivity of polished surfaces is very high
Q.20
The most important consideration in value engineering is the
Profit maximisation
Customer satisfaction
Cost reduction
Process improvement
Q.21
Electrometallurgy is not involved in the extraction of __________ from its ore.
Aluminium
Tin
Lead
Both B & C
Q.22
Normalising does not __________ of a metal.
Improve machinability & tensile strength
Remove internal stresses
Refine the structure
Remove strains caused by cold working
Q.23
Which of the following does not come under the category of electrochemical corrosion?
Corrosion in organic liquids
Atmospheric corrosion in moist gas or air
Soil corrosion as in the case of underground pipes
Corrosion in sea water and molten metals
Q.24
Starting friction is low in case of the __________ lubrication.
Boundary
Hydrodynamic
Hydrostatic
Mixed/semi-fluid
Q.25
Diffusion co-efficient of a metal in a solid solution depends upon its
Composition
Temperature
Both A & B
Neither A nor B
Q.26
Which of the following is not an explosive?
TNT
CMC
RDX
Lead azide
Q.27
The reductant used in the extraction of magnesium from calcined dolomite via Pidgeon's process is
Pure carbon
Pure silicon
Ferro silicon
Ferro manganese
Q.28
Induced draft fans provided in large thermal power plant boilers have __________ blades.
Forward curved
Backward curved
Double curved
Radial or straight
Q.29
The temperature at which the magnetic property of iron disappears (i.e., it becomes non-magnetic) and its electrical conductivity & specific heat also changes, is called the 'Curie point', which is __________ °C.
768
908
1400
1539
Q.30
The driving force for the sintering of a powder compact is
Strain energy
Surface energy
Volume energy
Stacking fault energy
Q.31
Which of the following alloying elements reduces the formation of iron sulphide in steel?
Cobalt
Nickel
Manganese
Vanadium
Q.32
Which of the following mainly decides the current to be employed is arc welding?
Electrode size
Plate thickness
Voltage across the arc
Welded portion length
Q.33
The delivery pressure of boiler feed water pump compared to the boiler steam pressure is
Same
Slightly less
Slightly more
Much more
Q.34
Calorific value of __________ are almost same.
Lignite & anthracite coal
Lignite & coal gas
Petrol & diesel
Coal gas & natural gas
Q.35
Closeness of packing is maximum in case of __________ crystal lattice.
Face centred
Simple cubic
Body centred
None of these
Q.36
High endurance limit of carburised machine parts is because of the fact that carburisation
Suppresses any stress concentration produced in the parts
Enhances the yield point of the material
Introduces a compressive layer on the surface
Produces a better surface finish
Q.37
In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet?
Zirconia
Alumina
Bakelite
Tungsten carbide
Q.38
Thermistors are used in __________ devices.
Voltage measuring
Temperature measuring
Temperature compensating
Both B & C
Q.39
More than 1000 tons refrigeration capacity plants are usually of __________ type.
Vapour compression
Vapour absorption
Air refrigeration
None of these
Q.40
An ingot is hot forged to a 60% reduction in cross-section area. The percentage reduction in the volume for the above process is
0
60
30
20
Q.41
An "orange peel" effect is observed
As a defect during metal casting/ welding
During deep drawing of metallic sheet having large grain size
During faulty heat treatment of steel
During extrusion of metal through a die
Q.42
Pick out the wrong statement.
Seam welding, projection welding & spot welding are the classification of electrical resistance welding
Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t = plate thickness to be welded)
In spot welding, two pieces to be joined are overlapped and placed between two electrodes
Mild steel sheet can not be spot welded
Q.43
'Sterilised zone' around a hazardous chemical industry is an area with __________ km radius around it, in which the total population/inhabitants should be less than 20000 preferably in the upwind direction.
0.5
5
25
50
Q.44
Internal cracks in drawn bars are due to
Secondary tensile stresses
Temperature gradient in the work piece
Heated dies and grips
Internal compressive residual stress
Q.45
The moment of inertia of a body comes into play in __________ motion.
Curvilinear
Linear
Rotational
None of these
Q.46
Overheating of satellites during re-entry to earth is controlled by
Thick insulation
Ceramic lining
Cooling by flow of air over the surface
None of these
Q.47
Pick out the wrong statement.
Erosion corrosion which is identified by surface grooves, occurs due to the combined action of corrosive environment and mechanical abrasion
Stress corrosion occurs due to the combined action of corrosive environment and the compressive stress
Stainless steel is prone to stress corrosion in solution containing chloride ion
In case of stress corrosion, the direction of crack propagation is perpendicular to the applied tensile stress
Q.48
The radioactive isotope of hydrogen is
Deuterium
Tritium
Protium
None of these
Q.49
In the floatation process, pine oil is used as the
Collector
Activator
Frother
Depressant
Q.50
Normalising does not __________ of a metal.
Improve machinability & tensile strength
Remove internal stresses
Refine the structure
Remove strains caused by cold working
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