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Chemical Engineering Basics
Quiz 4
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Q.1
In __________ process, there is an increase in entropy with no degradation of energy.
Isothermal expansion
Isochoric heat addition
Polytropic expansion
Isobaric heat addition
Q.2
Draft allowance given to patterns is for
Compensating the liquid state shrinkage
Easy removal of pattern from the mold cavity
Providing support for the core placement
Compensating the solidification shrinkage
Q.3
Potable water means the water used for
Fire-fighting
Cooling
Drinking
Evaporation to produce steam
Q.4
Brittleness induced due to the presence of sulphur in steel can be reduced by adding
Manganese
Magnesium
Vanadium
Copper
Q.5
Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)
H
H/2
H/4
H/6
Q.6
Expansion device used in a window air-conditioner is a/an
Automatic expansion valve
Thermostatic expansion valve
Float valve
Capillary tube
Q.7
The following thermocouple may be used for measuring temperature upto 1873°K.
Chromel-alumel
Copper-constantan
Platinum-platinum rhodium
Iron-constatan
Q.8
Pick out the correct combination about the role of various additives used in polymers.
Plasticiser : increases the polymer strength
Heat stabiliser : increases the maximum service temperature
Fillers: Does not affect the property of polymer but increases its weight
Lubricants: increases the flexibility of polymers
Q.9
Which of the following does not discharge the dust collected as a dry solid?
Electrostatic precipitator
Wet scrubber
Bag filter
Gravity settling chamber
Q.10
Shampoos are commercially not available in the form of
Powder
Gaseous mixture
Solution
Emulsion
Q.11
Color of brass changes from yellow to __________ after its dezincification which exemplifies selective leaching.
Grey
Red
Orange
Violet
Q.12
Out of the following, the materials having maximum magnetic permeability is
Silicon steel (Si = 4%)
Cast iron
Wrought iron
Mild steel
Q.13
Wrought iron does not have
Uniform strength in all directions
Ability to hold protective coating
High ductility & corrosion resistance
Easily weldable characteristics
Q.14
Wrought iron does not have the
Uniform strength in all directions
Ability to hold protective coating
High ductility & corrosion resistance
Easily weldable characteristics
Q.15
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³) while the C.V. is same on weight basis (i.e., kcal/kg) ?
Propane and acetylene
Propane and LPG
Sewage gas and gobar gas
B.F gas and coke oven gas
Q.16
The phenomenon of weld decay is found in case of
Gun metal
Brass
Stainless steel
Cast iron
Q.17
With increase in annealing temperature, the following defect density decreases.
Vacancy
Dislocation
Grain boundary
All of the above
Q.18
Which of the following has the least oili-ness ?
Mineral oils
Vegetable oils
Greases
Animal oils
Q.19
All of the following alloying elements of steel increases hardness but sacrifice ductility, except
Nickel
Vanadium
Molybdenum
Chromium
Q.20
If the pH value of a solution of sodium chloride is 7; then what will be the pH value of the solution after its electrolysis ?
7
< 7
> 7
0
Q.21
In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the
Range is 15°F
Approach is 10°F
Both A & B
Neither A nor B
Q.22
Change in volume of metals from absolute zero temperature to their melting points is
Almost same for all metals
Different for different metals
Less for low melting point metals
Less for high melting point metals
Q.23
Presence of nickel & chromium in steel does not raise its
Elastic limit
Machining properties
Ductility
Resilience
Q.24
Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode
Occurs higher in the electro-chemical series of metals
Is exemplified by magnesium plate
Is much cheaper than the cathodic base material to be guarded against corrosion
All of the above
Q.25
Use of flux during soldering is done to
Increase flidity of solder by lowering its melting temperature
Prevent oxide formation
Wash away surplus solder
Full up the joint gap
Q.26
"Internal energy of a gas obeying Vanderwall's equation of state, (p + a/v²)(V - b) = RT , depends upon its"
Pressure & temperature
Pressure & specific volume
Temperature & specific volume
Temperature only
Q.27
The phenomenon occurring during explosion of a hydrogen bomb is
Nuclear fission
Nuclear fusion
A combination of both nuclear fission & fusion
None of these
Q.28
A floating body oscillates about its __________ when it is displaced slightly.
Centre of gravity
Metacentre
Centre of buoyancy
Centre of pressure
Q.29
Which of the following is a permanent fastening?
Rivets
Bolts
Screws
Keys
Q.30
Magnetic permeability of iron is increased by its
Decarburising
Alloying with cobalt
Purification
Alternate heating & cooling
Q.31
Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails
Below the yield point
Above the yield point
Below the elastic limit
At the elastic limit
Q.32
Gross national product (GNP) means the total value of __________ in a country.
Goods produced
Gold reserve
Earning of the citizens
Taxes paid
Q.33
The most serious manufacturing defect from fracture toughness point of view is
Surface roughness
Pores
Spherical inclusion
Crack
Q.34
Unit of surface tension in S.I. unit is
Watt/m
Joule/m²
Newton/m²
Joule/m
Q.35
In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (θ) and thermal diffusivity (α). The units of these quantities are.
μ , α and θ all have units of m/s
μ , α and θ all have units of m²/s
α and θ have units of m²/s, while μ has unit of m/s
α and θ have units of m/s, while μ has unit of m²/s
Q.36
Fluorine is not a constituent of
Freon
Chloroform
Teflon
Fluorocarbons
Q.37
Superheated vapour behaves like
Dry steam
Gas approximately
An ordinary vapor
None of these
Q.38
The quantity of electricity required to deposit one gm equivalent of any substance is one
Ampere
Coulomb
Microfaraday
Faraday
Q.39
Feed check valve is used in steam boilers to
Check the water level in the boiler
Check the feed water flow rate
Feed high pressure water to boiler and guard against its backflow through it
None of these
Q.40
Fire in fuel gas pipelines is extinguished most effectively by
Spraying water
Blanketting the area with nitrogen atmosphere
Fire fighting foam
None of these
Q.41
Boiling point of water gets lowered at high altitudes (e.g., hills), because
Temperature is low
Atmospheric pressure is low
Atmospheric pressure is high
None of these
Q.42
The most commonly used moderator in nuclear power plants is
Graphite
Light water
Heavy water
Berellium
Q.43
Role of a "collector" in froth floatation is to
Form a water repelling film on the mineral surface
Create and stabilise the froth
Act as a surface
Collect the minerals according to their specific gravity
Q.44
The yield point in fatigue loading compared to that in static loading is less. The ratio of ultimate tensile strength to endurance limit of a material subjected to fatigue loading is
0.5
1
1.5
2
Q.45
FeO (s) + CO (g) = Fe (s) + CO₂ (g), k = 0. 435 at 1173E; At equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO at 1173 K?
1.0
1.3
2.3
3.3
Q.46
Material of construction of foundary crucible is
Graphite
Lead
Porcelain
Stainless steel
Q.47
Plastics as a material of construction suffer from the drawback of low
Machinability
Density
Strength
Plastic deformation
Q.48
Which is the only metal that exists in liquid state at room temperature?
Sodium
Mercury
Lithium
Strontium
Q.49
Limestone is added in the blast furnace (during pig iron manufacture) to
Form slag by combining with impurities
Supply heat by undergoing exothermic reaction with impurities
Reduce the coke consumption
Reduce slag viscosity
Q.50
Function of blow down valve in a boiler is to
Maintain the drum level
Keep the drum pressure constant
Drain out the sludge from the drum
Empty the boiler during shutdown
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