CPI, Process control & Design Flashcards
The minimum plate spacing in most of the petroleum refinery distillation columns (if diameter 73 ft) is normally
18”
Back-trapping in a distillation column results due to
a finite stage contactor
Twenty-five percent cut segmental baffle means that the baffle
height is 75% of the I.D. of the shell
Joint efficiency for a seamless pipe is
1
In the design of a paddle agitator the ratio paddle diameter to tank diameter is normally taken as:
0.8
The ratio propeller agitator diameter to tank diameter is normally taken as:
0.15-0.30
The minimum baffle height should be
twice the impeller diameter
Vertical valves are not supported by
saddles
Aqua regia is a mixture of
nitric and HCl
What alloying element is added in stainless steel to impart corrosion resistance?
chromium
process for the manufacture of soda ash (Na2CO3)?
Solvay process
It is the most abundant metal in the earth‘s crust
aluminum
A process used in paper production in which sodium sulfate is added to a basic digestion liquor
sulfate process
Corundum is
aluminum oxide
Silicone rubbers are
polysiloxanes
Blue vitriol is
CuSO45H2O
An ore of lead
galena
Prussian blue is
ferric ferrocyanide
Epsom salt is
magnesium sulfate
Salt peter is
potassium nitrate
A unicellular organism surrounded by a cell wall possessing a distinct nucleus
yeast
It is characterized by simple vegetative bodies from which reproductive structures are elaborated. It contains no chlorophyll and therefore requires sources of complex organic molecules.
fungi
An industrial process for making hydrazine from ammonia and hypochlorite ion in aqueous solution.
Raschig process
An early method for the production of sodium carbonate form sodium chloride, calcium carbonate and sulfuric acid.
Leblanc process
An early process for the production of sulfuric acid, in which SO2 is oxidized to SO3 by nitrogen oxides in lead-lined chambers.
Lead chamber process
kaolinite
Al2O32SiO22H2O
A fracturing, or flaking off, of a refactory brick, or block, due to uneven heat stresses or compression caused by heat.
spalling
An arrangement of physical components connected or related in such a manner as to command, direct or regulate itself or another system is a
control system
An inherent disadvantage of this control system is that it results in continuous cycling of the controlled variable and thus produces excessive wear in the final control element.
on-off control
It is an arrangement of physical components connected or related in such a manner as to form and/or act as an entire unit.
set
It is a control system in which the control action is independent of the output.
open-loop system
The simplest mode of control which is characteristic of two-position control commonly utilized in a thermostat for controlling the temperature of heaters, air-conditioners, refrigerators, etc…
on-off control
A sensor usually made of semi-conductor that utilizes the effect of temperature on the resistance to current is called a
thermistor
What is the end product in the process of fermentation?
ethanol
substance, usually oxides, used in glass, glazes and ceramic bodies to lower high melting point of the main glass forming constituents
Fluxes
a heat-resistant material, i.e. a mineral that is resistant to decomposition by heat, pressure or chemical attack
refractory
glass made by fusing pure silica without a flux, very resistant thermally and chemically.
Vitreous silica
Soluble glasses used only as solutions
Alkali silicates
soda-limed-silica glass of such wide applications, for windows, transparent fixtures, and all manner of containers
Lime glass
which of the following is not a natural cellulosic fibers
a. cotton
b. jute
c. sisal
d. yarn
yarn
