Chemical Engineering Basics Flashcards
incombustible
CCl4
The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used.
aluminium oxide
Tin based white metals are used, where bearings are subjected to
high pressure & load.
Friction factor for fluid flow in pipe does not depend upon the
pipe length.
All of the following alloying elements of steel increases hardness but sacrifice ductility, except
nickel
Fog is an example of colloidal system of
liquid dispersed in gas.
type of bonding is strongly directional in solids.
Covalant
Chromium molybdenum steel can not be welded using __________ welding.
electrical resistance
Speisses is a mixture of the following
Arsenides of heavy metals.
Auto collimator is used to check
angle
In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
t = 15 - 0.0065 h
A high pressure boiler generates steam at a pressure greater than __________ kg/cm2
80
Maxwell’s thermodynamic relations applies to the
chemical systems in equilibrium.
Annealing of white cast iron produces __________ iron.
malleable
Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)
both ‘a’ & ‘b’
A solar cell converts the sunlight directly into __________ energy.
electrical
If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.
breeder
Wrought iron is never shaped by
casting
Powder metallurgy process does not make metal powder by
hammering
In the blast furnace, incorporation of water vapour in the blast gives the following effect.
Increases the reducing potential of the gas.
Pick out the wrong statement.
Tungsten steel and alnico are not hard magnetic materials.
The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.
400 - 700
Maximum permissible air velocity in pipelines is about __________ metre/second.
10
__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.
Alumina
Titanium alloys are welded using the Following process:
TIG welding.
An alloy of Fe - 0.4 % C is
hypo-eutectoid steel.
A material in which the atoms are arranged regularly in some directions but not in others, is termed as ‘mesomorphous material’; an example of which is
lead
Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.
200
following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ?
none of these.
Machinability of hard alloys and tool steels is improved by
annealing
Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating.
austenite
Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.
grey
In condensers used in thermal power plants, steam is normally used in shell side
water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.
Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography.
γ-rays
The product out from a cupola is called
cast iron
Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as
Gr0.25, Gr
If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity
remains unchanged.
Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.
10-3
Corrosion of metals can not be prevented by its
tempering
Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of
Grashoff number & Prandtl number.
The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area.
parabolic
Energy of the sun arises mainly from __________ reactions.
fusion
Which of the following fastening devices has a head at one end and a nut fitted to the other ?
stud
Sudden fall of atmospheric pressure by a large amount is an indication of the
Storm
In chemical dehumidification process
dry bulb temperature remains constant.
Secondary hardening in steels arises out of the
decomposition of retained austenite upon heat treatment.
Drills are usually made of
high speed steel
Tumbling is the process of improving the __________ of the materials/parts.
surface cleanliness
The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost double.
flow output
__________ of air does not increase with increase in temperature.
Density
Spherical shape of mercury droplets is due to its
high surface tension.
Sub zero treatment of steel is done to
reduce the retained austenite in hardened steel.
Air-petrol ratio for maximum power generation in spark ignition engine is about
12 : 1
Which of the following varies as the square root of oil pressure during atomization of fuel oil through a pressure jet burner ?
Both (a) & (b)
The most suitable material of construction for a sewer to carry sewage under high pressure is
steel
Oxygen cylinders used for autogenous (cutting/welding) purposes are
seamless & made of steel.
Identify the correct statement
Lead can be produced in a blast furnace.
Dowtherm is a
high temperature heating medium (a petroleum product)
To counteract the bad effects of strain hardening on a cold formed part, it must be
annealed
The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then
all ‘a’ , ‘b’ & ‘c’
Galvanic corrosion can not be prevented by
anodic protection.
Fire in fuel gas pipelines is extinguished most effectively by
blanketting the area with nitrogen atmosphere.
he most suitable abrasive for grinding high tensile strength materials
Aluminium oxide
