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Chemical Engineering
Chemical Engineering Basics
Quiz 7
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Q.1
Absorptivity of a grey body varies with the
Wavelength of the incident ray
Temperature
Both A & B
Neither A nor B
Q.2
The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the
Ability to absorb shock
Capacity to store energy
Ratio of the wire & coil diameters
Load to produce unit deflection
Q.3
Coating of zinc over steel is known as
Cladding
Galvanising
Anodising
Passivation
Q.4
The effect of friction on the flow of steam through a nozzle is to decrease the __________ of steam.
Wetness
Mass flow rate
Both A & B
Neither A nor B
Q.5
Addition of __________ in steel can help in increasing the depth of hardness.
Nickel
Chromium
Vanadium
Tungsten
Q.6
A solar cell converts the sunlight directly into __________ energy.
Thermal
Electrical
Mechanical
Chemical
Q.7
A boy weighing 110lb climbs up a 50 ft high vertical destination in 100 seconds. Horse power of the boy is __________ hp.
0.1
0.5
0.8
1
Q.8
Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be __________ mm.
10
20
30
40
Q.9
Batch process is preferred over continuous process, when the
Product yields and quality can not be achieved in continuous process, because of long residence time
Sales demand of product is not steady
Same equipment can not be used for several processes of the same nature
All of the above
Q.10
Transformer cores are normally made from
Soft ferrites
High purity iron
Grain oriented Fe-Si alloy
Al-Ni-Co alloy
Q.11
The tensile strength of plastics ranges from __________ kg/mm².
10 to 50
50 to 100
0.01 to 0.1
0.1 to 10
Q.12
Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography.
X-rays
Γ-rays
Α-rays
Β-rays
Q.13
RADAR is
Acronym for Radio Detection and Ranging
Name of technique for locating distant objects
Name of instrument for locating distant objects
All of the above
Q.14
All modes of heat transfer i.e., conduction, convection & radiation occur in case of the
Condensation of steam in a partial condenser
Boiler furnace
Insulated pipe car raying high pressure steam
None of these
Q.15
Usual value of the resistance suitable for a wire resistance strain gauge is __________ ohms.
20
80
120
500
Q.16
Regeneration of molecular seive requires it to be heated to a temperature of about __________ °C.
80-120
200-300
600-800
1000-1100
Q.17
Ferromagnetic material owe their properties to __________ inner sub-shells.
Completely filled
Partially filled
Equally filled
Vacant
Q.18
Electrochemical corrosion can occur, only if __________ is present in contact with metal.
Air
Oxygen
Liquid medium
Gaseous medium
Q.19
The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.
Tension
Shear
Compression
Bending & tension
Q.20
Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of
90% tungsten carbide and 10% cobalt
70% aluminium oxide & 30% silica
30% nickel, 15% chromium & 55% tungsten
65% tungsten & 35% zirconium
Q.21
The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 x 10⁻¹6⁶ m² . S⁻¹ and it is 1.94 x 10⁻¹⁴ m² S⁻¹ at 1200 K. The activation energy (in k. J.mole⁻¹ ) for the diffusion of Ni in Cu is
130
180
230
250
Q.22
Hoope's cell is predominantly used for the electrolytic refining of
Zinc
Copper
Aluminium
Tin
Q.23
The co-ordination number in simple cubic structure is
4
6
8
12
Q.24
L.D. (Linz-Donawitz) converter is used in the production of
Copper
Steel
Zinc
Aluminium
Q.25
Device used as a standard for the calibration of pressure gauges is a
Bellow
Diaphragm
Dead weight pressure tester
Mercury manometer
Q.26
Hot extrusion of aluminium is done in the temperature range of __________ °C.
550-600
450-500
350-400
250-300
Q.27
A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its
Aqueous tension
Saturated humidity
Vapor pressure
Absolute humidity
Q.28
Hot extrusion process is not used for making
Cast iron pipe for domestic water supply
Aluminium curtain rods
Stainless steel tubes used in furnitures
Any of these
Q.29
Addition of beryllium to copper is done mainly to produce a/an __________ alloy.
Non-sparking & non-magnetic
High strength
Precipitation hardenable
Corrosion resistant
Q.30
A spring material should have low
Elastic limit
Deflection value
Fatigue resistance
None of these
Q.31
Which of the following metals can not be extracted by pyrometallurgical process from its sulphide ore?
Copper
Mercury
Lead
None of these
Q.32
Alloy powder manufactured by the following process have spherical shapes.
Electrochemical deposition
Gaseous reduction
Atomisation
Mechanical attrition
Q.33
Steam condenser tubes are made of ad-mirability brass, in which percentage of zinc & copper are __________ respectively.
70 & 30
30 & 70
50 & 50
90 & 10
Q.34
In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.
0.5
1
5
20
Q.35
Thermodynamic cycle involved in the working of a thermal power plant is the __________ cycle.
Joule
Carnot
Rankine
Brayton
Q.36
Pick the odd man out.
Austempering
Martempering
Cyniding
Parkerizing
Q.37
Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same
Period increases
Period decreases
Group increases
Both 'b' & 'c'
Q.38
The excess air required for the combustion of pulverised coal is of the order of about __________ percent.
5
15
30
45
Q.39
Which of the following rays has the least wavelength?
Ultraviolet rays
Infrared rays
Cosmic rays
X-rays
Q.40
A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm².
6
18
38
52
Q.41
In __________ process, ions of salts react with water to produce acidity or alkalinity.
Hydration
Hydrolysis
Electrolysis
Dialysis
Q.42
Impeller & casing of centrifugal pump handling corrosive liquid and frequently running under cavitation condition is most prone to __________ corrosion.
Uniform
Oxygen diffusion
Pitting
Inter-granular
Q.43
The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?
159
1837
2537
10000
Q.44
Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by
Conduction
Convection
Both A & B
Radiation
Q.45
Pearlite comprises of
87% cementite & 13% Fe
87% ferrite & 13% cementite
93.33% ferrite & 6.67% C
87% ferrite & 13% C
Q.46
Fire refining process is employed in case of
Tin
Copper
Zinc
Aluminium
Q.47
Draught produced by a tall chimney due to density difference between hot flue gas inside the Chimney and atmospheric air outside the chimney is more appropriately known as the __________ draught.
Natural
Induced
Forced
Chimney
Q.48
Pick out the wrong statement.
Weldability of high carbon steel is poorer compared to low carbon steel
Invar is a magnetic alloy
Magnetic permeability of the diamagenetic material is less than one
Martensitic transformation never goes to complection ( i.e., 100%) at room temperature
Q.49
CANDU type nuclear reactor using natural uranium as fuel is the extensively used nuclear reactor because of the fact that the
Specific fuel consumption is very low due to the use of heavy water
Fuel cost is much lower than that used in pressurised water or boiling water reactor
Heavy water is used both as coolant as well as moderator
Both B and C
Q.50
Plasma is
A high temperature neutral gas
Nothing but ionised gas
A source of steady and highest controllable pressure
Formed at very low temperature
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