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Chemical Engineering
Chemical Engineering Basics
Quiz 11
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Q.1
The best criterion for analysing an economic investment is the
Rate of return criterion
Present value method
Salvage value
Future value method
Q.2
Atomic __________ of an element is a whole number.
Weight
Number
Volume
Radius
Q.3
Specific heat of an ideal gas depends upon its
Molecular weight
Pressure
Temperature
Volume
Q.4
Rankine cycle comprises of two isothermal and two __________ processes.
Isobaric
Polytropic
Isentropic
None of these
Q.5
__________ iron is produced by the annealing of white cast iron.
Malleable
Nodular
Ductile
Grey
Q.6
Brinell Hardness Number (BHN) for talc is approximately in the range of
1-5
20-30
100-150
200-250
Q.7
Gantt charts are used for streamlining the
Inventory control
Production schedule
Sales forecasting
Quality control
Q.8
Materials having __________ lattice structure are usually the most ductile.
Body centred cubic (bcc)
Hexagonal close packed (hcp)
Face centred cubic (fcc)
None of these
Q.9
Which of the following will resist maxi-mum shock & vibration without cracking?
Grey cast iron
White cast iron
Malleable iron
Graphite
Q.10
Which of the following is not used as a fuel in rocket propellaht ?
Liquid hydrogen
Liquid oxygen
Liquid hydrazine
Kerosene oil
Q.11
First empirical temperature scale conceived is the __________ temperature scale.
Absolute
Reaumer
Farenhite
Celcius
Q.12
If a heat transfer surface is pock-marked with a number of cavities, then as compared to a smooth surface the heat transfer by __________ will not increase.
Convection
Nucleate boiling
Radiation
Conduction
Q.13
Constituents of stellite are
Zinc, copper & nickel
Cobalt, chromium & tungsten
Zinc, aluminium & nickel
Nickel, cobalt & vanadium
Q.14
Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight
1.5
3
5
7
Q.15
The most commonly used combustion system manufactured in India for the thermal power plant boilers is the __________ combustion system.
Pulverised fuel
Travelling grate stoker firing
Circulating fluidised bed
Fluidised bed
Q.16
Toughness of a material is measured by the
Vicker's hardness test
Scratch test
Universal testing machine
Notched bar test
Q.17
Fatigue resistance of a material is measured by the
Elastic limit
Ultimate tensile strength
Young's modulus
Endurance limit
Q.18
Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type
Parallel flow with equal heat capacities
Counter flow with equal heat capacities
Counter flow with unequal heat capacities
Parallel flow with unequal heat capacities
Q.19
Unit of viscosity in CGS system is
Gm .cm⁻¹ sec⁻¹
Gm . cm² . sec⁻²
Gm .cm⁻², sec⁻¹
Gm . cm . sec⁻¹
Q.20
__________ is not a heat treatment process.
Cyaniding
Pakerising
Austempering
Martempering
Q.21
Nitrogen is not an essential component of
Protein
Urea
Oils & fats
Any of these
Q.22
Pick out the wrong statement.
Molecules with symmetrical arrangements (.e.g. CH₄ or CCl₄) are nonpolar
Generally, nonpolar compounds are chemically inactive, conduct electricity poorly and do not ionise
Most of the hydrocarbons are nonpolar
None of these
Q.23
Materials having resistivity ranging from 1 to 100 ohm. cm is termed as
Conductor
Insulator
Semi-conductor
None of these
Q.24
Isotropic materials have the same __________ in all directions.
Induced stresses
Density
Elastic properties
Thermal properties
Q.25
Carbon is present in the form of __________ in grey cast iron.
Spheroids
Nodular aggregates of graphite
Flakes
Cementite
Q.26
The stress at which a metal fails by fatigue lies
Near the fracture point of the stress-strain curve
In the plastic range
In the elastic range
None of these
Q.27
Pick out the wrong statement. If the net positive suction head (NPSH) requirement of a pump is not satisfied, then
It will deliver low discharge of liquid
Its efficiency will not be affected
It will not develop sufficient head to raise water
It will be cavitated
Q.28
Source of heat supply in a cupola is
Coke
Charcoal
Lumpy coal
Pulverised coal
Q.29
Which of the following is an example of cathodic protection of metals against corrosion ?
Painted steel
Galvanised iron
Case hardened steel
Lead lined reactor
Q.30
Buoyancy force depends on the __________ the liquid.
Depth of immersion in
Displaced mass of
Surface tension of
Viscosity of
Q.31
Which one is neutral in character ?
N₂O₄
N₂O
N₂O₅
N₂O₃
Q.32
What is the effect on the performance of the economiser in the thermal power plant boiler, if the feed water temperature is very low due to preheaters being out for repairs or starving of steam supply ?
It results in corrosion due to the condensation on the flue gas side of the economiser tubes due to handling of low temperature water
Economiser tube life increases due to handling of low temperature water
Heat transfer efficiency of economiser increases due to picking up high heat from the flue gases
Scale formation rate on economiser tubes increases
Q.33
Consideration of the creep is the most important in case of the
Blades of gas turbine
Piston of an I. C. engine
Flywheel of steam engine
Cycle chain
Q.34
Creep consideration is the most important in case of the
Blades of gas turbines
Steam engine flywheel
Cast iron pipes
Cycle chains
Q.35
What is the value of included angle of a triangular notch for maximum discharge ?
30°
60°
90°
120°
Q.36
Pick the odd man out of the following.
Calorising
Pack carburising
Nitriding
Cyaniding
Q.37
In age-hardenable alloys, maximum ductility is obtained
In as cast state
Immediately after solution treatment and subsequent quenching
After optimum ageing
After overageing
Q.38
Which of the following materials has the maximum shrinkage allowance ?
Brass
Cast iron
Lead
Aluminium alloy
Q.39
Alloys having more than 80% copper are generally more
Abrasion resistant
Corrosion resistant
Prone to season cracking
Machinable
Q.40
Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is
Black
Silver grey
Green
Yellow
Q.41
The basic function of the drum in a boiler is to
Act as a storage for feed water
Act as a storage for steam
Separate steam from water
Remove settling impurities from steam
Q.42
Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as
Gr
0.25
, Gr
Gr
0.25
, Gr
0.33
Gr, Gr
0.25
Gr
0.33
, Gr
0.25
Q.43
On decreasing the grain size of a polycrys-talline material, the property most likely to deteriorate is
Creep
Toughness
Tensile strength
Fatigue
Q.44
Which of the following metals is the most prone to work hardening?
Brass
Aluminium
Copper
Lead
Q.45
Wohler test is a destructive test to find out the __________ strength of a prepared metal specimen.
Creep
Fatigue
Endurance
Tensile
Q.46
Presence of small quantity of sulphur in low carbon steel improves its
Formability
Machinability
Weldability
Hardenarality
Q.47
A suitable lubricant used for watches is
Metallic soap solution
Grease
Palm oil
Hazel-nut oil
Q.48
Powder metallurgy is used to produce
High precision components with complex cavities and sharp features
Components of large size
Porosity free components
Components of such alloys whose constituents do not form alloys readily
Q.49
A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent.
150
200
300
400
Q.50
The phenomenon of strain-ageing is generally experienced with
Cast iron
Low carbon steel
High manganese steel
High carbon steel
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