Coaching Flashcards
(30 cards)
Nitric acid is not used in the manufacturing of
detergents
The film thickness for laminar film condensation on vertical
surface __________ from top to bottom.
cumulatively increases
Fouling factor must be included in the calculation of overall
design heat transfer coefficient, when the liquid
containing suspended solids flows at low velocity.
At equal mass velocities, the values of film coefficients for
gases as compared to that for liquids are generally.
lower
Wavelength corresponding to the maximum energy is inversely
proportional to the absolute temperature. This is __________ law.
Wien’s
A body cools down from 75°C to 70°C in 10 minutes. It will cool
down from 70° C to 65° C in __________ minutes.
> 10
With an increase in pressure in gaseous phase chemical reactions, the fractional conversion __________ when the number of moles
decreases.
increases
In case of calcination of limestone, CaCO3 to CaO + CO2, the
addition of more of CaO will result in __________ in the
concentration of CO2.
No change
________ column is preferred to be used, when a high liquid hold
up is required in a reactor for gas-liquid reaction.
bubble
With increase in the order of reaction (for all positive reaction
orders), the ratio of the volume of mixed reactor to the volume
of plug flow reactor (for identical feed composition, flow rate
and conversion)
increases
Which allotrope of sulfur is insoluble in carbon disulfide?
Plastic sulfur
Lap joints are preferred for plates having thickness __________
mm.
> 3
Which of the following is not strictly required for
crystallization to occur?
Solvent removal
A chemical reaction occurs, when the energy of the reacting
molecules is __________ the activation energy of reaction.
equal to or more than
Air from a 100-psig source is free-flowing down a long pipe
discharging to the atmosphere. This is an example of what kind of fluid flow?
compressible
In filtration, the flowrate is proportional to
Pressure drop
Escherichia coli and Salmonella belong to which of the following
bacterial phyla?
proteobacteria
The partial molar enthalpy of a component in an ideal binary gas
mixture of composition Z, at a temperature T and pressure P, is a
function only of
T and P
(cylindrical vessel) For a cylindrical internally pressurized vessel, which of the following closure types would withstand highest pressure, if each closure is of the same material and thickness?
Ellipsoidal (2:1)
What is the dispersion number for a CSTR?
∞
Pressure drop in packed bed for turbulent flow is given by the
__________ equation.
Blake-plummer
In which of the following evaporators, steam is fed inside the
tube while the liquor is outside the tube ?
Horizontal tube evaporator
The Stefan-Boltzmann constant depends on the
None of these (medium, surface, temperature)
The rate at which a substance reacts is proportional to its active
mass and the rate of a chemical reaction is proportional to the
product of active masses of the reacting substances”. This is the
Law of mass action
(Not in the choices)
