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Chemical Engineering Basics
Quiz 18
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Q.1
The conventional mechnical transducer, which converts pressure signal to displacement signal is
Spring
Manometer
Strain gauge
None of these
Q.2
Heat release during phase change is observed in case of a/an
Boiler
Condenser
Evaporator
All of the above
Q.3
For dynamic strain measurement, the wheatstone bridge used is of __________ type.
Voltage sensitive null
Voltage sensitive deflected
Current sensitive deflected
None of these
Q.4
Galena is an ore of
Iron
Copper
Lead
Aluminium
Q.5
Galvanic corrosion
Occurs in a bimetal couple
Occurs in highly stressed metallic parts only
Is exemplified by caustic embrittlement of boiler tubes
Is also called dezincification
Q.6
Superheating of steam is done at constant
Enthalpy
Entropy
Pressure
Volume
Q.7
Pick out the wrong statement.
The X-rays can not be deflected by electric field unlike cathode rays
The intensity of X-rays can be measured by ionisation current produced due to the ionisation of gas by X-rays
The quality of X-rays can be controlled by varying the anode-cathode voltage
Crystal structure of a material can be studied by an electron microscope
Q.8
Coating provided on the electrodes used in the arc welding is not expected to
Add alloying elements
Prevent electrode from contamination
Stabilise the arc
Provide protective atmosphere to weld
Q.9
Which of the following hardness tests does not measure the indentation hardness of metals and alloys ?
Vicker's hardness test
Shore sceleroscope test
Brinell hardness test
Rockwell hardness test
Q.10
In a furnace with heating element temperature at 1700°C, the dominant machanism of heat transfer will be
Conduction
Radiation
Natural convection
Forced convection
Q.11
Annealing of cast iron
Softens it to facilitate machining
Decreases the free carbon
Increases the strength
None of these
Q.12
Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag.
2
3
0.8
6
Q.13
The pH value is the measure of hydrogen ion concentration in a solution. The term pH stands for the __________ in the solution.
Power of hydrogen ion concentration
Percentage of hydrogen ions
Presence of hydrogen ions
None of these
Q.14
Which of the following is the most suitable abrasive for grinding high tensile strength materials?
Silicon carbide
Corundum
Aluminium oxide
Boron carbide
Q.15
Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs.
Enthalpy
Relative humidity
Wet bulb temperature
Dew point temperature
Q.16
Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs?
Enthalpy
Relative humidity
Wet bulb temperature
Dew point temperature
Q.17
A metal having a Poisson's ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is
-0.8
0.8
+0.08
-0.24
Q.18
Photographic plates are coated with
Silver nitrate
Silver halide
Calcium silicate
Metallic silver
Q.19
Catalyst used in the 'catalytic converter' employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is
Alumina
Platinum
Vanadium pentoxide
Iron oxide
Q.20
Ammonia leakage in the refrigeration system is detected by
Sulphur stick, which on detection gives white smoke
Using chemical reagents
Its smell
Soap solution
Q.21
Knocking tendency in a petrol engine decreases with increasing
Supercharging
Compression ratio
Wall temperature
Engine speed
Q.22
Volumetric composition of flue gas analysed with the Orsat apparatus is : CO₂ = 12%, O₂ = 8%, CO = nil, N₂ = 80%. This flue gas composition indicates that
Pure oxygen has been used for combustion
Nitrogen percentage in the fuel is very high
Excess air has been used for combustion
Hydrogen is not present in the fuel
Q.23
Age hardening is connected with
Babbit metal
Gun metal
Stainless steel
Duralumin
Q.24
Gas carrying pipelines are best joined by
Nuts & bolts
Rivetting
Welding
None of these
Q.25
Out of the following, the rays having the lowest wavelength is the
Radio waves
Ultrasonic waves
Infra red rays
X-rays
Q.26
Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of
Lumps
Pellets
Briquettes
Sinter
Q.27
A fine grained grinding wheel should not be used for grinding __________ materials.
Hard
Brittle
Soft & ductile
None of these
Q.28
Which of the following is not an ore of aluminium?
Troosite
Kaolin
Alunite
Cryolite
Q.29
Which of the following is not an ore of aluminium?
Troosite
Kaolin
Alunite
Cryolite
Q.30
Which of the following is the most suitable for removing fine particles (< 1 micron diameter) from air below its dew point?
Venturi scrubber
Electrostatic precipitator
Cyclone separator
Fabric filter
Q.31
Volute casing of a centrifugal pump does not facilitate
Uniform flow of fluid coming out of the impeller
Increase in the pump efficiency
Conversion of the part of the velocity head to the pressure head
Conversion of the part of the pressure head to velocity head
Q.32
The main charge in blast furnace is usually
Iron ore & coke
Iron ore, coke & air
Limestone, coke & iron ore
Limestone, sand & iron ore
Q.33
In Newton's law of viscosity, which states that the shear stress is proportional to the __________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, V
g
= velocity gradient ).
V²
1/V²
1/V
g
V
g
Q.34
A metalloid possesses the characteristics of both the metals and non-metals. Which of the following is not a metalloid?
Arsenic
Antimony
Lead
None of these
Q.35
Hypo (sodium thiosulphate) because of its complex forming behaviour is used in photography to remove undecomposed silver bromide as a soluble complex for __________ of the picture.
Printing
Developing
Colour
Fixation
Q.36
Which of the following gases cause global warming?
Carbon monoxide
Carbon dioxide
Nitrogen
Ozone
Q.37
Principal alloying element in Elinvar (used for making hair springs for watches) is
Copper
Aluminium
Nickel
Zinc
Q.38
Matte smelting is used in the extraction of
Lead
Zinc
Aluminium
Copper
Q.39
Which of the following material handling equipments is not suitable for moving materials in varying paths?
Hand trolley
Belt conveyor
Crane
Truck
Q.40
Earing is a defect found in steels after the following metal working operation (s).
Deep drawing
Rolling
Extrusion
Wire drawing
Q.41
Function of gear box is to
Reduce the speed
Obtain variable speed
Increase the speed
Produce high torque
Q.42
Function of fusible plug in a boiler is to
Drain out water and sludge from the boiler during repair
Put off fire in the furnace when water level in the boiler falls to unsafe limit
Guard the boiler in case of abnormal rise in steam pressure
All of the above
Q.43
Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C is
3
5
0.5
1.5
Q.44
Minimum diameter of the tube used for making water manometer should be __________ mm to avoid a correction for the effect of capillarity.
1
2.5
4
6
Q.45
Steel balls are manufactured by cold heading. After cold forming, they are subjected to
Tempering
Normalising
Stress-relieving
Artificial ageing
Q.46
The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?
Cyaniding
Sheardising
Spherodising
None of these
Q.47
The life of a ball bearing is inversely proportional to
(load)
1
(load)
2
(load)
3
(load)
0.33
Q.48
Material having negative co-efficient of linear expansion is
Copper
Aluminium
Rubber
Nickel
Q.49
Presence of sulphur in steel reduces the
Hardness
Grain size
Tensile strength
Toughness & transverse ductility
Q.50
For the Stoke's law to be valid in the case of a falling sphere in a fluid, the
Reynolds number (based on sphere diameter) should be < 1
Flow around the sphere should be in turbulent region
Sphere must be metallic
Fluid density should be constant
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