CPI, Process control & Design

Question 1

The minimum plate spacing in most of the petroleum refinery distillation columns (if diameter 73 ft) is normally

Answer 1

18”

Question 2

Back-trapping in a distillation column results due to

Answer 2

a finite stage contactor

Question 3

Twenty-five percent cut segmental baffle means that the baffle

Answer 3

height is 75% of the I.D. of the shell

Question 4

Joint efficiency for a seamless pipe is

Answer 4

1

Question 5

In the design of a paddle agitator the ratio paddle diameter to tank diameter is normally taken as:

Answer 5

0.8

Question 6

The ratio propeller agitator diameter to tank diameter is normally taken as:

Answer 6

0.15-0.30

Question 7

The minimum baffle height should be

Answer 7

twice the impeller diameter

Question 8

Vertical valves are not supported by

Answer 8

saddles

Question 9

Aqua regia is a mixture of

Answer 9

nitric and HCl

Question 10

What alloying element is added in stainless steel to impart corrosion resistance?

Answer 10

chromium

Question 11

process for the manufacture of soda ash (Na2CO3)?

Answer 11

Solvay process

Question 12

It is the most abundant metal in the earth‘s crust

Answer 12

aluminum

Question 13

A process used in paper production in which sodium sulfate is added to a basic digestion liquor

Answer 13

sulfate process

Question 14

Corundum is

Answer 14

aluminum oxide

Question 15

Silicone rubbers are

Answer 15

polysiloxanes

Question 16

Blue vitriol is

Answer 16

CuSO45H2O

Question 17

An ore of lead

Answer 17

galena

Question 18

Prussian blue is

Answer 18

ferric ferrocyanide

Question 19

Epsom salt is

Answer 19

magnesium sulfate

Question 20

Salt peter is

Answer 20

potassium nitrate

Question 21

A unicellular organism surrounded by a cell wall possessing a distinct nucleus

Answer 21

yeast

Question 22

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.

Answer 22

fungi

Question 23

An industrial process for making hydrazine from ammonia and hypochlorite ion in aqueous solution.

Answer 23

Raschig process

Question 24

An early method for the production of sodium carbonate form sodium chloride, calcium carbonate and sulfuric acid.

Answer 24

Leblanc process

Question 25

An early process for the production of sulfuric acid, in which SO2 is oxidized to SO3 by nitrogen oxides in lead-lined chambers.

Answer 25

Lead chamber process

Question 26

kaolinite

Answer 26

Al2O32SiO22H2O

Question 27

A fracturing, or flaking off, of a refactory brick, or block, due to uneven heat stresses or compression caused by heat.

Answer 27

spalling

Question 28

An arrangement of physical components connected or related in such a manner as to command, direct or regulate itself or another system is a

Answer 28

control system

Question 29

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.

Answer 29

on-off control

Question 30

It is an arrangement of physical components connected or related in such a manner as to form and/or act as an entire unit.

Answer 30

set

Question 31

It is a control system in which the control action is independent of the output.

Answer 31

open-loop system

Question 32

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…

Answer 32

on-off control

Question 33

A sensor usually made of semi-conductor that utilizes the effect of temperature on the resistance to current is called a

Answer 33

thermistor

Question 34

What is the end product in the process of fermentation?

Answer 34

ethanol

Question 35

substance, usually oxides, used in glass, glazes and ceramic bodies to lower high melting point of the main glass forming constituents

Answer 35

Fluxes

Question 36

a heat-resistant material, i.e. a mineral that is resistant to decomposition by heat, pressure or chemical attack

Answer 36

refractory

Question 37

glass made by fusing pure silica without a flux, very resistant thermally and chemically.

Answer 37

Vitreous silica

Question 38

Soluble glasses used only as solutions

Answer 38

Alkali silicates

Question 39

soda-limed-silica glass of such wide applications, for windows, transparent fixtures, and all manner of containers

Answer 39

Lime glass

Question 40

which of the following is not a natural cellulosic fibers a. cotton b. jute c. sisal d. yarn

Answer 40

yarn