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Chemical Engineering Basics
Quiz 24
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Q.1
Pick out the correct statement.
Materials exhibiting high elasticity obey Hooke's law
The elastic behaviour of rubber under compression is the same as its behaviour under tension
The damping capacity of a material is due to its plastic deformation
The stress required to cause plastic flow in polycrystalline material is higher as compared to monocrystalline materials due to the presence of grains of different orientations
Q.2
Yield strength of a polycrystalline metal with an average grain size, d, is proportional to
d
1/2
d
-1/2
d
d
-1
Q.3
A material expanding freely due to heating will develop __________ stress.
No
Compressive
Tensile
Thermal
Q.4
Joining of thin foils is preferred to be done by
Gamma rays
X-rays
Microwaves
Gas welding
Q.5
Which of the following metals occurs in nature in their free metallic state?
Au & Ag
Pb & Zn
Cu & Ni
None of these
Q.6
Steels with high carbon equivalent have poor weldability, because in these steels during welding
Carbon and other alloying elements get oxidised from the weld pool
Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld
Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld
Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld
Q.7
The refrigerant freon-12 is chemically
CCl₂F₂
CCl₃F
CClF₃
CCl₄F
Q.8
Welded joint is superior to revetted joint in respect of ease of fabrication, weight and strength. Which of the following joints is the most suitable for pipes carrying fluids under high pressure and temperature?
Flanged joint
Expansion joint
Bell and spigot joint
None of these
Q.9
Commonly employed coolant for high pressure turbogenerator is
Air
Carbon dioxide
Hydrogen
Water
Q.10
The surface tension of a liquid, at critical temperature is
Indeterminate
Zero
Infinity
Same as that at any other temperature
Q.11
Identify the false statement
Martensitic steels are less susceptible to pitting corrosion than austenitic steels
Pitting corrosion is usually very localised
Hydrogen embrittlement is facilitated by tensile stress
Stress corrosion cracking is facilitated by tensile stress
Q.12
Pick out the correct statement.
Hot worked materials are subjected to annealing to remove internal stresses
Annealing of steel hardens it slightly
Normalising of a material induces stresses
Tempering of a material improves ductility & toughness but reducess hardness & brittlenes
Q.13
Pick out the correct statement.
A base is always soluble in water
Hydrogen is released whenever a metal reacts with an acid
Sodium hydroxide is both a base and an alkali
All of the above
Q.14
Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of
Steel
Glass wood
Copper
Fireclay bricks
Q.15
Which of the following has the least value of ultimate tensile strength (UTS)?
Medium carbon steel
High carbon steel
Cast iron
Wrought iron
Q.16
In a good rimming steel
Carbon and silicon should be low
Silicon should be low but carbon should be high
Both silicon & carbon should be high
Silicon should be high but carbon should be low
Q.17
Hydrocyclone is a
Crusher
Wet classifier
Dry classifier
Magnetic separator
Q.18
Consider the equilibrium A
(g)
+ B
(g)
= AB
(g)
. When the partial pressure of A is 10⁻² atm, the partial pressure of B is 10⁻³ atm and the partial pressure of AB is 1 atm, the equilibrium constant 'K' is
10 atmv
10⁵ atm⁻¹
10 (dimensionless)
10⁵ (dimensionless)
Q.19
In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C.
20
60
120
∞
Q.20
Out of the following, the best material capable of withstanding shock & vibration without the danger of cracking is
Malleable iron
Grey cast iron
Chilled cast iron
White cast iron
Q.21
Which of the following materials does not form adherent oxide film on surface?
Copper
Nickel
Aluminium
Gold & silver
Q.22
Broaching tools are usually made of
Cermets
High speed steel
Tungsten carbide
Stellite
Q.23
The lightest non-inflammable gas is
H₂
He
Ar
O₂
Q.24
Fatigue life is expected to increase by
Increasing the size of the sample
Smooth polishing of the surface of the sample
Having compressive residual stresses at the surface
Having tensile residual stresses at the surface
Q.25
Hydrogen can be
Used in I.C. engines as fuel
Liquefied & stored under cryogenic conditions
Produced by electrolysis of water
All of the above
Q.26
In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is
Less
More
Equal
Unpredictable
Q.27
In inventory control theory, the economic order quantity (EOQ) is the
Lot size corresponding to break even analysis
Average level of inventory
Optimum lot size
None of these
Q.28
Out of the following, the __________ pipe has the least corrosion resistance.
Mild steel
Copper
Cast iron
Wrought iron
Q.29
Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.
10
-3
10
3
10
-15
L0
15
Q.30
Which of the following is not categorised as the ore agglomeration process?
Nodulising
Pelletising
Balling
Briquetting
Q.31
Out of the following, the best material capable of withstanding shock & vibration without the danger of cracking is
Malleable iron
Grey cast iron
Chilled cast iron
White cast iron
Q.32
Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?
Output & fineness
Velocity
Both A & B
None of these
Q.33
Hooke's law
Applies to elastic deformation
Applies beyond limit of proportionality in stress-strain curve
States that stress is inversely proportional to strain upto elastic limit
Noneofthese
Q.34
__________ is a special constituent of chlorophyll without which photosynthesis is not possible.
Calcium
Nitrogen
Phosphorous
Hydrogen
Q.35
Heat treatment of steel is done mainly to change its
Mechanical properties
Physical properties
Chemical composition
All of the above
Q.36
Fire on fuel oil lines can be extinguished by
Foam
Steam
Water
Carbon dioxide
Q.37
The ultimate strength in tension for steel is __________ times the ultimate strength in shear.
0.5
0.9
1.5
2.5
Q.38
Tesla metre per ampere (T. m/A) is the unit for the measurement of
Magnetic succeptibility
Magnetic moment
Permeability of free space
Flux density
Q.39
Stresses encountered in the metal forming processes are less than the __________ of the material.
Fracture strength
Yield strength
Elastic limit
Limit of proportionality
Q.40
Reduction in the grain size reduces the __________ of the material.
Fatigue resistance
Tensile strength
Creep resistance
All of the above
Q.41
Gross & Net calorific values will be the same for
Methane
Propane
Carbon monoxide
Hydrogen
Q.42
The activity co-efficient of the solute in a dilute solution
Decreases with the increase of concentration of the solute
Increases with the increase of concentration of the solute
Remains constant
Is unity at infinite dilution
Q.43
Satellites burn off during re-entry to earth's atmosphere, because of the
Combustion with air
Gravitational pull by earth
Friction with earth's atmosphere
Loss in weight of the satellite
Q.44
Which of the following is used to produce draught in the locomotive boilers ?
Chimney
Induced draught fan
Forced draught fan
Steam jet arrangement
Q.45
Air intake for an air compressor should be preferably taken from
A site, where cooling towers are located nearby
A site, where open coal yard in located nearby
An air conditioned room maintained at a temperature of 18°C
An outside atmosphere at 10°C
Q.46
Boiler tube size is specified by its thickness and __________ diameter.
Outside
Inside
Mean
None of these
Q.47
__________ property of steel increases by addition of large amount of silicon in it.
Mechanical
Machining
Magnetic
Refractory
Q.48
LASER
Stands for Light Amplification by Stimulated Emission of Radiation
Has the same intensity as visible light
Can't be used for cutting metals
None of these
Q.49
Sheardising process is used for
Surface coating
Heat treatment of high speed steel
Cold working on metals
None of these
Q.50
Malleabilisation heat treatment is performed on
Cast steel
Grey cast iron
White cast iron
Spheroidal graphite cast iron
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