CHEMICAL ENGINEERING BASICS Flashcards
Which one of the following is incombustible ?
H2
CCl4
C2H2
S
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.
aluminum 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
pipe roughness
fluid density & viscosity
mass flow rate of fluid
pipe length
All of the following alloying elements of steel increases hardness but sacrifice ductility, except
nickel
vanadium
molybdenum
chromium
nickel
The following type of bonding is strongly directional in solids.
Vander Waal’s
Ionic
Metallic
Covalant
Covalant
Fog is an example of colloidal system of
liquid dispersed in gas.
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
Evaporative cooling process employs a combination of cooling and humidification in which the
sensible heat is removed and the latent heat is added.
Which of the following is not an explosive ?
TNT
CMC
RDX
Lead azide
CMC
Maxwell’s thermodynamic relations applies to the
chemical systems in equilibrium
Annealing ofwhite 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)
a. A
b. l
c. A^2
d. both ‘a’ & ‘b’
d. 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.
increasing the reducing potential of the gas
Pick out the wrong statement.
A. A ferromagnetic material becomes paramagnetic above the ‘Curie temperature’.
B. Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials.
C. Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces.
D. Tungsten steel and alnico are not hard magnetic materials.
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
Area under the stress-strain curve upto the __________ is referred to as the modulus of resilience.
proportional limit
__________ 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
In extrusion of metals, which of the following statement is true ?
Hollow ram is used for indirect extrusion.
Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.
200
Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ?
A. Emissivity of pipe surface.
B. Diameter & length of the pipe.
C.Temperature of hot pipe surface & that of air in the room.
D. none of these
D. 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 and cooling water on the tube side, because of the reason that
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.
X-rays
γ-rays
Absolute zero pressure can be attained at a temperature of
0°R
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
Gr^0.25, 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
Copper deposits are found in India at the following location:
Khetri
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. Vertical velocity distribution in an open channel for laminar flow can be assumed to be
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
