chemical engineering calculations

Question 0

The type of process where a material enters the process during its operation accumulates in the process vessel and withdrawn only after the process is over.

Answer 0

Semi-batch process

Question 1

The term used to report pressure being the height of a column of a liquid of known density.

Answer 1

Head

Question 2

The material which remain unchanged in a process is called ______

Answer 2

Tie substance

Question 3

It is the reactant that would disappear first if the reaction goes to completion.

Answer 3

Limiting reactant

Question 4

The ratio of the partial pressure of a vapor pressure in equilibrium with the liquid.

Answer 4

Relative Humidity

Question 5

The maximum number of independent equations that can be derived by driving the material balances for an input and output stream with two component substances is/a

Answer 5

2

Question 6

For balances on atomic species, which of the following material balance is applied?

a. input + generation = output
b. input = output
c. input + generation = output + consumption
d. input = output + consumption

Answer 6

input = output

Question 7

Which of the following terms could express the extent to which the limiting reactant had reacted?

a. conversion. c. degree of completion
b. yield. d. all of these

Answer 7

d. all of these

Question 8

Type of process stream that can be used to control the composition of a final exit streams by skipping one or more stages of the process and goes directly to another downstream stage.

Answer 8

By-pass

Question 9

The analysis of coal given in %C, %N, %S,% moisture, % net H, % combined water and % ash is called ________

Answer 9

Modified proximate analysis

Question 10

Type of moisture in coal which assumed to be the water held within the pore system and capillaries of coal.

Answer 10

Inherent moisture

Question 11

The empirical relation which allows one to compute for the net hydrogen in a given solid fuel is________

Answer 11

Dulong Formula

Question 12

Coal analysis which is based upon the volatilization characteristics of the fuel.

Answer 12

Proximate Analysis

Question 13

The combustible present in refuse.

Answer 13

mixture of coked and uncoked coal

Question 14

In the combustion of solid fuels, the tie component between the feed and the refuse is the

Answer 14

Ash

Question 15

An orsat analyis of the flue when pyrite is roasted is a/an

Answer 15

SO3-free basis

Question 16

Combustion conditions which will give the highest theoretical flame temperature

Answer 16

Low percentge excess air, high air inlet temperature

Question 17

The heating value measured when water formed from combustion is in the liquid state is the

Answer 17

Gross Calorific Value

Question 18

The application of the physical sciences together with the principle of economics and human relations to field that pertain directly to processes and process equipment in which matter is treated to effect a change in state , energy content or composition.

Answer 18

Chemical Engineering

Question 19

Commonly used in the engineering and scientific community, also referred to as MKS system.

Answer 19

Systeme Internationale d’United (SI)

Question 20

A system similar to SI but uses cm, gram and seconds for length, mass and time respectively.

Answer 20

CGS System

Question 21

A system that uses ft, pound and seconds for length, mass and time respectively.

Answer 21

American Engineering System (AES) or English System

Question 22

Process where the feed is charged into the system at the beginning of the process and the products all atonce reoved sometime later.No mass crosses the system boundaries between the time the feed is charged and the time the product is removed.

Answer 22

Batch Process

Question 23

Process where input and output flow continuously throughout the duration of the process.

Answer 23

Continuous

Question 24

process wherein process variables does not vary with time.

Answer 24

Steady-state process

Question 25

Process wherein process variables varies with time.

Answer 25

Transient or unsteady-state

Question 26

Temperature measuring devices:

Answer 26

Pyrometer (spectra of emitted radiation) Thermometer ( volume of a fixed mass of fluid) Thermocouple (potential difference due to two welded junctions) Resistance thermometer (elrctrical resistance of a conductor)

Question 27

Pressure measuring devices

Answer 27

Open-end manometer - measures relative or gauge pressure Sealed-end manometer- measures absolute pressure Bourdon gauge- usually gives gauge pressure of the fluid

Question 28

Is the pressure exerted by a column of Hg at 0 deg C given that the density of Hg at this temperature is 13.59508 g/cm3 and the acceleration due to gravity is 9.89665 m/s2.

Answer 28

Standard Atmospheric Pressure (ATP)

Question 29

It involves removal of relatively small amount of water or liquids from the solid materials. It involves blowing hot dry air over the wet solid evaporating water , leaving a dry product and producing humid air.

Answer 29

Drying

Question 30

Used to concentrate a solution consisting of a non volatile solute and volatile solute. Involves vaporization of portion of solvent to produce a concentrated solution or thich liquor.

Answer 30

Evaporator

Question 31

Separation of mixtures based on differences in volatilities by utilizing vapor and liquid phases at essentially same temperature and pressure for the coexisting zones.

Answer 31

Distillation

Question 32

Involves formation of solid particles within a homogeneous phase by either cooling or removing some of the solvents.

Answer 32

Crystallization

Question 33

It involves quantitative relationships between reactants and products in a balanced chemical reaction.

Answer 33

Stoichiometry

Question 34

Species present in the relationships between reaction that would be completely consumed theoretically if the reaction were proceed to completion.

Answer 34

Limiting reactant

Question 35

Reactant present in more than its stoichiometric proportion relative to every other reactant.

Answer 35

Excess reactant

Question 36

Ratio of the amount present in excess to the amount stoichiometrically required.

Answer 36

Fractional excess

Question 37

Ratio of the change in the number of moles of species and its stoichiometric coefficient of the species in reaction.

Answer 37

Extent of reaction

Question 38

Fraction of feed or some component in the feed that is converted to products.

Answer 38

Fractional conversion

Question 39

Ratio of the moles of desired product to the moles of the undesired product or by-product.

Answer 39

Selectivity

Question 40

Fraction of limiting reactant converted into products.

Answer 40

Degree of Completion

Question 41

Conversion of reactant based on the amount of material that eneters and leaves the reactor.

Answer 41

Single pass conversion

Question 42

Conversion of reactant in the process based on the amount of material that enters (fresh feed) and leaves the reactor (overall product).

Answer 42

Overall Conversion

Question 43

Material or energy stream that leaves a downsteam process unit and returned to the same process unit or upstream unit.

Answer 43

Recycle

Question 44

Material or energy stream bled off from a process to prevent accumulation of inert materials that may build up in the recycle streams.

Answer 44

Purge