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Chemical Engineering Basics
Quiz 1
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Q.1
Lap joints are preferred over butt joints in soldering/brazing, because these joints are
Weaker in tension but stronger in shear
Weaker in shear but stronger in tension
Stronger in both shear and tension
The lap joints are easily made
Q.2
α-rays are
Negatively charged
Positively charged
Neutral
Same as X-rays
Q.3
In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be
ΔQ = 0, ΔS=0
ΔQ = 0 , ΔS = +ve
ΔQ = 0, ΔS = -ve
ΔQ = +ve , ΔS= +ve
Q.4
Carbon supply in pack carburising process is in the form of
Charcoal
Calcium carbide
Hydrocarbon oil
Graphite
Q.5
The two elements required to form substitutional solid solution should not have
Same crystalline structure
Same valancy
Widely differing electronegativity
Same atomic sizes
Q.6
Solution loss reaction occurs
In the blast furnace shaft
During pretreatment of hot metal
In the L.D. process
During deoxidation in the ladle
Q.7
The bulk modulus of a material with Poisson's ratio of 0.5 is equal to
3 x Young's modulus
Young's modulus
Infinity
Zero
Q.8
Air-petrol ratio for maximum power generation in spark ignition engine is about
6:1
12 : 1
18 : 1
24 : 1
Q.9
Cadmium in zinc leach liquor is removed by cementation using
Zinc
Iron
Nickel
Copper
Q.10
Holes for rivetting purposes should be preferably made by
Cutting torch
Drilling
Punching
None of these
Q.11
Permanent set in a material is produced by subjecting it to
Triaxial loading
Fatigue loading
Stresses beyond the elastic limit
Tensile & compressive loads simultaneously
Q.12
Consumable electrodes are used in the __________ welding.
Gas
Arc
Thermit
Resistance
Q.13
Nusselt number/Biot number varies
Inversely with thermal conductivity
Directly with heat transfer co-efficient
Directly with thermal conductivity
Inversely with the dimension of the solid
Q.14
The same volume of all gases is representative of their
Specific gravities
Densities
Gas characteristic constants
Molecular weights
Q.15
The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is
More
Less
Same
More but less than the diameter of bolt
Q.16
Silicon in steel
Makes it usable in almost all magnetic circuits where alternating current is used
Increases its electrical resistivity and decreases the hysteresis loss
Is present upto 5% & 4% respectively when used in transformers & motor armatures
All of the above
Q.17
Most important property of steels for use in automobile bodies is the
Formability
Yield strength
Toughness
Resilience
Q.18
The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag.
Fluidity
Basicity
Acidity
Viscosity
Q.19
In a titration involving weak acid and strong base, the preferred indicator is
Methyl orange
Phenolphthalein
Ethyl orange
Fehling's solution
Q.20
Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than
5
10
20
35
Q.21
With increase in impurities in metals, their corrosion resistances
Increase
Decrease
Remain same
May increase or decrease ; depending on the type of metal
Q.22
Projection welding & stud welding is categorised as the __________ welding.
Pressure
Thermit
Resistance
Arc
Q.23
Filler metal is not used in the __________ welding.
Seam
Electric spot
Projection
All of the above
Q.24
Uniform ramming of sand in green sand moulding process leads to
Reduced chance of gas porosity
Greater dimensional stability of the casting
Uniform flow of molten metal into the mould cavity
Less sand expansion type of casting defect
Q.25
Pick out the wrong statement. Termination of polymerisation reaction occurs, if the
Catalyst supply is stopped
Monomer supply is exhausted
Impurities present in monomers interfere with the chemical reaction
Two ends of a chain of molecules join
Q.26
Statistical quality control was developed by __________ , an American scientist during world war II.
Water shewhart
Fredric Taylor
John Wright
Woolmer
Q.27
Which of the following fastening devices has its both ends threaded?
Bolt
Stud
Set screw
Split nut
Q.28
Out of the following, __________ waves have the largest wavelength.
Radio
Light
X-ray
Gamma-ray
Q.29
The activity of pure hydrogen gas at 1000°C and 5 atm pressure
Is always less than 1
Is always greater than 1
Can be 5
Depends on the choice of the standard state
Q.30
If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.
Critical
Breeder
Fertile
Heterogenous
Q.31
Machinability of hard alloys & tool steels is improved by
Spherodising
Annealing
Tempering
Normalising
Q.32
The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.
60 - 100
400 - 700
1200 -1500
2000 - 2300
Q.33
Exposure to __________ accelarates the degradation of plastics.
Ultraviolet radiation
High atmospheric temperature
High ambient temperature
Damp atmosphere
Q.34
Which of the following equipments is used for liquid dispersion?
Packed column
Venturi scrubber
Bubble cap plate column
Wetted wall column
Q.35
Galvanic corrosion can not be prevented by
Cathodic protection
Anodic protection
Usage of largest possible anodic area
Any one of these
Q.36
Wrought iron is never shaped by
Casting
Cold working
Forging
Welding
Q.37
The standard instrument used for calibrating the load applied by universal testing machine is called
Extensometer
Spring balace
Dynamometer
None of these
Q.38
Resilience of a material is important, when it is subjected to
Creep
Fatigue
Shock loading
Galvanising
Q.39
Which of the following metals can be extracted from its ore by both pyrometallur-gical as well as hydrometallurgical methods ?
Copper
Zinc
Both A & B
Neither A nor B
Q.40
One of the methods of purification of leach liquor is ion exchange, which involves
Exchange between two liquid phases
Exchange between a gaseous phase and a liquid phase
Exchange between a liquid phase and an organic resin phase
Exchange between a solid phase and a gas phase
Q.41
Grey cast iron (used for making underground water pipes and manhole covers) as compared to steel has higher
Ductility
Impact strength
Machinability
Melting point
Q.42
A common disinfectant used in village wells for disinfection of water is
Free chlorine
Bromine
Iodine
Potassium permanganate
Q.43
Use of water as a manometric liquid suffers from the disadvantage of its
Low vapour pressure
Corrosive nature
High vapour pressure
High boiling point
Q.44
Gas turbine normally employs a constant __________ cycle.
Pressure
Temperature
Volume
None of these
Q.45
The substance used as a smoke screen in warfare is
C₂H₂
SiCl₄
P₂O₅
PCl5
Q.46
Old cycle handles are coated with nickel using
Cementation
Spray coating
Galvanising process
Tinning process
Q.47
The function of a nozzle provided in steam turbine is to
Throttle down (i.e., reduce) the pressure of steam
Convert internal energy into kinetic energy
Increase the velocity of steam
All of the above
Q.48
Biological shield in a nuclear reactor is generally provided to protect against the
α-rays
β-rays
Gamma rays & neutrons
Electrons
Q.49
Ingrannular corrosion occurs __________ stainless steel.
In all types of steels except
At the surface of
Along grain boundaries of
In the core of
Q.50
Dry saturated steam can be converted into superheated steam by
Increasing its cross-sectional area of flow
Passing it through a pressure reducing valve
Forcing it downwards through a vertical tube
None of these
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