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Chemical Engineering Basics
Quiz 5
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Q.1
As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise.
110
85
60
45
Q.2
The following type of bonding is strongly directional in solids.
Vander Waal's
Ionic
Metallic
Covalant
Q.3
Desert air coolers being rendered ineffective in rainy season is due to
Low humidity
Low temperature
High humidity
Sunny weather
Q.4
Auto collimator is used to check
Flatness
Angle
Rotor balancing
Roughness
Q.5
About __________ ton of coke is required in a cupola to produce one ton of casting.
0.03
0.3
0.8
1.5
Q.6
Pick out the wrong statement.
In Parke's process, zinc is added to remove silver from lead
In the Pidgeon process of producing magnesium, powdered ferro-silcon is used as the reducing agent
Molten lead is used for shock cooling of the zinc vapours in the zinc blast furnace
Pure copper electrodes are used as anode for electro-refinning of copper
Q.7
The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.
Condenser
Refrigerant cooling
Evaporator
Throttling
Q.8
A reduction in thermal resistance during heat transfer does not occur in the
Convection heat transfer by stirring the fluid and cleaning the heating surface
Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity
Radiation heat transfer by increasing the temperature and reducing the emis-sivity
None of these
Q.9
Material of construction of foundary crucible is
Lead
Stainless steel
Graphite
Cast iron
Q.10
A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place
The better insulation material should be put just next to pipe (i.e., inside)
The better insulating material should be put outside
Either of the insulating material could be put on either side
Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)
Q.11
The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is termed as the
Critical point
Curie temperature
Inversion temperature
Eutectic temperature
Q.12
Non-ferrous alloys used for making cutting tools need not have high
Abrasion resistance
Toughness
Red hardness
Cutting speed
Q.13
The gases used in the treatment of asthma is a mixture of __________ and oxygen.
Helium
Argon
Neon
None of these
Q.14
While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the
Low impact strength
High flexibility
Better finish and surface appearance
High plastic deformation
Q.15
Enzymes belong to the category of
Proteins
Carbohydrates
Vitamins
Fats
Q.16
Pick out the wrong statement.
Partnership is suitable for medium size business
A certain minimum of subscription of capital is required for legally starting a business in a Public Limited Joint Stock Company
Public Limited Joint Stock Company is legally bound to issue prospectus after registration
A small scale industry is the one, which has a minimum capital investment of Rs. 50 lakhs and maximum 100 lakhs
Q.17
Metal cutting by oxy-acetylene flame is accomplished by the __________ of the metal.
Burning
Intensive oxidation
Evaporation
None of these
Q.18
Dryness fraction of dry steam is
0
?
1
0.5
Q.19
At room temperature, F.C.C. crystal structure is observed in
Lead
Cupro-nickel
Titanium
Tungsten
Q.20
Pick out the wrong statement:
Soft water is more corrosive than that carrying calcium salts
The corrosion of brass condenser tubes handling brine solution is also termed as 'dezincification'
Non-annealed brass is highly susceptible to season cracking (i.e., inter-crystal corrosion due to internal stresses)
Pure copper is highly susceptible to stress corrosion
Q.21
Out of the following, the highest emf for a given temperature is generated by the __________ thermocouple.
Chromel - alumel
Iron - constantan
Platinum - platinum + rhodium
Copper-constantan
Q.22
__________ property of a material is determined by the Herbert Pendulum device.
Hardness
Tensile
Toughness
Compressive
Q.23
For preparation of porous bearings by powder metallurgy, preferred particle shape is
Spherical
Nodular
Irregular
No preferred shape
Q.24
The suction and delivery pressure for a two stage compressor are 1 and 25 atm respectively. The intermediate stage pressure would be around __________ atm.
5
10
15
20
Q.25
Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.
Scratch
Indentation
Dynamic
Rebound
Q.26
Pick out the correct statement
Jet engine can work, where there is no atmosphere
Rocket engines cannot work, where there is no atmosphere
Rocket engines carry oxygen required for the combustion in the form of oxidiser
Jet engines also carry oxidiser
Q.27
Which of the following is not the function of a volute casing provided in a centrifugal pump?
To reduce the head loss in discharge
To increase the pump efficiency
To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at constant velocity
To increase the pump discharge rate
Q.28
Monazite deposits constitute an important source for the following metal.
Thorium
Titanium
Molybdenum
None of the above
Q.29
Phosphorous is added to copper melt to
Remove hydrogen
Deoxidise the metal
Improve fluidity
Reduce shrinkage
Q.30
Heating of ferromagnetic materials to a temperature above Curie temperature makes it
Insulator for heat & electricity transmission
Ferritic
Behave like paramagnetic materials
Superconductor
Q.31
In case of fluid moving machineries, the relationship between saturation temperature and pressure decides the process of
Water hammer
Cavitation
Flow separation
Turbulent mixing
Q.32
Pressure gauges are never connected directly to the live steam line; rather a loop or syphon is interposed as close as possible to the pressure gauge. This is done to
Avoid the overheating of the tubes & bellows which operate them to minimise error and damage
Form a seal of water by steam condensate to fill the tube or bellows at the pressure being measured
Both 'a' & 'b'
Avoid the static head error introduced by steam entry
Q.33
Which of the following materials has the poorest electrical conductivity?
Carbon
Aluminium
Silver
Stainless steel
Q.34
Water flow in the river during flood can be categorised as the __________ flow.
Unsteady uniform
Unsteady non-uniform
Steady uniform
Steady non-uniform
Q.35
__________ is a non volatile film forming constituent of a paint.
Thinner
Dryer
Drying oil
None of these
Q.36
'Cryogenics' is concerned with the generation & use of low temperature in the range of
0°K to 123°K
0°C to - 123°C
0°C to - 273°C
0°K to 273°K
Q.37
Which of the following is not an ore of copper?
Cryolite
Azurite
Chalcopyrite
Malachite
Q.38
Particle nature of cathode rays is proved due to the fact that they
Travel in a straight line
Get deflected by magnetic electric field
Produce fluorescence
Heat the exposed material
Q.39
The units of the rate constant for a second order reaction are
Sec⁻¹. mole°
Moles¹. sec⁻¹
Moles⁻¹. sec¹
Moles¹. sec¹
Q.40
The single most imortant requirement for a turbine blade material is
Damping
Resilience
Creep resistaned
DBTT
Q.41
Material having maximum density is
Plutonium
Osmium
Titanium
Uranium
Q.42
Catalyst used in the catalytic converter employed in automobiles to convert CO into CO and for complete oxidation of un-burnt hydrocarbons is
Nickel
Cobalt
Vanadium
Platinum
Q.43
Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m² .k), when the insulation thickness is __________ mm.
15
25
10
30
Q.44
The forms in which various metals and non metals occur in nature are called minerals. Which of the following is not a metallic ferrous mineral?
Cassiterite
Sphalerite
Chalcopyrite
Calcite
Q.45
Which of the following alloying elements when added in steel does not improve its lachinability?
Sulphur
Phosphorous
Copper
Lead
Q.46
During solid state sintering of powders, the following mechanism can be active.
Evaporation and condensation
Solid state diffusion processes
Liquid formation in grain boundaries
Creation of more dislocations
Q.47
On-off control
Fully opens the final control element, when the measured variable is below the set point
Fully closes the final control element, when the measured variable is above the set point
Is a two position control (fully open or fully closed) control adequate to control a process with slow reaction and minimum dead time or transfer lag
None of these
Q.48
Which of the following is an unconventional source of energy ?
Thermal power
Hydroelectric power
Nuclear-fusion power
Solar power
Q.49
Pick out the wrong conversion of absolute & kinematic viscosities.
1 stoke = 1 cm²/sec
1 N.sec/m² = 10 paise
1 stoke = 1 m²/sec
1 m²/sec = 10⁴ stokes
Q.50
Which of the following metals is not subjected to electrolytic refinning/purification?
Copper
Zinc
Tin
Aluminium
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