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Chemical Engineering Basics
Quiz 22
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Q.1
The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.
Evaporative capacity
Evaporation efficiency
Thermal efficiency
Steam load
Q.2
'GASOHOL' widely used in Brazil as a motor fuel is a mixture of alcohol and
Petrol
LPG
Light hydrocarbon gases (e.g. butane or propane)
None of these
Q.3
Flywheel is provided in a machine to
Provide structural strength to the shaft
Smoothen the power impluses
Help in quick starting of the machine
None of these
Q.4
__________ has a negative co-efficient of linear expansion.
Iron
Copper
Rubber
Nickel
Q.5
Methyl orange indicator turns
Orange yellow in alkaline medium
Orange yellow in acidic medium
Colourless in acidic medium
Colourless in basic medium
Q.6
Normalising of a casting does not
Induce stresses in it
Refine its grain structure
Reduce seggregation
Improve its mechanical properties
Q.7
Normalising of an object does not
Refine coarse grain structure obtained during hot working
Improve ductility
Improve yield strength
Improve machanical properties
Q.8
In an eutectic system, two elements are completely
Soluble in solid state
Insoluble in liquid state
Insoluble in both solid & liquid state
Soluble in liquid state
Q.9
Unbreakable crockeries are made from __________ polymers.
Polystyrene
Melamine
Polystyrene
Polyurathane
Q.10
Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and
Manganese
Silicon
Nickel
Chromium
Q.11
Two stroke engine compared to a four stroke engine has
Higher efficiency
Less fuel consumption
Higher power to weight ratio
Lower initial cost
Q.12
Steel is welded using the __________ flame.
Carburising
Neutral
Oxidising
All of the above
Q.13
Inertial forces are obtained, when the elastic forces are multiplied by __________ number.
Mach
Froude
Reynolds
Euler
Q.14
Lubricants can be used to
Transmit power hydraulically
Form a seal in compressors
Remove contaminants by flushing and to insulate transformers, switchgears etc
All of the above
Q.15
Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding
Glycerol
Nitro cellulose
Camphor
None of these
Q.16
Semi-conductors normally employ __________ bonding.
Co-ordinate
Ionic
Covalant
Metallic
Q.17
__________ is not used as the control rod material in a nuclear reactor.
Cobalt
Hafnium
Cadmium
Boron
Q.18
Young's modulus of a material is the measure of its
Stiffness
Malleability
Creep resistance
Tensile strength
Q.19
Square steel key is normally strong in failure by shear & crushing. Keys are normally made of __________ steel bars.
Hot rolled mild
Cold rolled mild
Forged
Machinable stainless
Q.20
An engineer's hammer is made of high __________ steel.
Carbon
Speed
Silicon
Chromium
Q.21
Reduction reaction involves the
Loss of electrons
Increase in oxidation number
Gain of electrons
Addition of oxygen
Q.22
Lubrication is done to control
Friction
Wear
Temperature
All of the above
Q.23
In case of compression of one kg of air, the work done will be the least, when the value of polytropic index 'n' is
1
1.4
1.5
Y = C
p
/C
v
Q.24
Large diameter reinforced cement concrete (RCC) pipes are generally joined by __________ joint.
Flanged iron
Collar
Flexible
Expansion
Q.25
Out of the following materials, the one which generally exhibits an yield point is
Hard bronze
Soft brass
Cold rolled mild steel
Hot rolled mild steel
Q.26
__________ is used for tying the steel coloumns to concrete foundation.
Grouting
Eyebolt
Anchor bolts
Refractory castables
Q.27
A pipeline buried in soil is commonly protected from corrosion by
Anodic protection
Cathodic protection
Using inhibitors
Using a special alloy resistant to corrosion
Q.28
Which of the following is not an ore of iron?
Chalcopyrite
Magnetite
Hemetite
Limonite
Q.29
The thermodynamic law, PV
y
= constant, is not followed by the
Free expansion of an ideal gas
Adiabatic expansion of steam in turbine
Adiabatic compression of air
Ideal compression of air
Q.30
Neutrons are present in all atoms except that of
He
C
H
Ar
Q.31
__________ is the hardest material out of the following.
Boron carbide
Tungsten carbide
Hardened steel
Silicon carbide
Q.32
Magnesium is present in
Haemoglobin
Chlorophyll
Hypo solution
None of these
Q.33
Which of the following has rotten eggy smell?
Hydrogen sulphide
Styrene
Phenol
Dimethyl amine
Q.34
Which of the following is not the commercial name of polymethyl-methacrylate (PMMA)?
Styrofoam
Lucite
Perspex
Plexiglass
Q.35
The routing function in a production system design is concerned with the
Material flow optimisation through the plant
Machine utilisation
Quality control of the product
Manpower utilisation
Q.36
What is the percentage of chromium in 18-4-1 high speed steel?
1
4
18
23
Q.37
No cutting fluid is normally used, while machining
Cast iron
Aluminium
Mild steel
Stainless steel
Q.38
Which of the following is not a ferromagnetic material?
Nickel
Cobalt
Aluminium
Iron
Q.39
Which of the following pairs regarding the effect of alloying elements in steels are not matched correctly?
Cobalt: It contributes to rerl hardness by hardening ferrite
Molybdenum: It forms abrasion resisting particles
Phosphorous: It improves machinability in free cutting steels
Silicon: It reduces oxidation resistance
Q.40
Corrosion of metals can not be prevented by its
Tempering
Chromising
Aluminising
Alloying
Q.41
Which of the following materials has the least scrap value?
Aluminium
Stainless steel
Brass
Copper
Q.42
At 100% relative humidity, the dew point temperature of moist air is
Less than the wet bulb temperature
More than the wet bulb temperature
Equal to the wet bulb temperature
Equal to the ambient temperature
Q.43
One ton of refrigeration is not equivalent to the heat removal rate of
200 BTU/minute
50 kcal/minute
50 kJ/sec
3.5 KW
Q.44
In practice, the compression ratio of compression-ignition (CI) engine ranges from
15 to 25
5 to 10
40 to 55
60 to 70
Q.45
In sheet metal forming, stretcher strains occur in
Duralumin sheets
Low carbon steel sheets
Austenitic stainless steel sheets
Ni-base alloy sheets
Q.46
Which is the most suitable joint for the pipes, with are laid submerged under water, where the bottom of the river bed is uneven?
Collar joint
Flexible joint
Flanged joint
Expansion joint
Q.47
Turning/machining of __________ usually does not require any cutting fluid.
Cast iron
Stainless steel
Mild steel
Copper
Q.48
Nitrogen compounds are not used in the manufacture of
Fertilisers
Gun powder
Tip of match sticks
Explosive
Q.49
A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalant bonds resulting in __________ electrons.
Lack of free
Excess of
Decrease in
None of these
Q.50
Secondary hardening in steels arises out of the
Precipitation of fine alloy carbides at high temperatures
Refinement of ferrite grain size by working
Decomposition of retained austenite upon heat treatment
Precipitation of complex inter-metal-lics upon heat treatment
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