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Concepts Flashcards

1
Q

A plate holding a pool of liquid from which rises a vapor whose average composition is in equilibrium with a liquid whose composition is the average of that liquid leaving the plate is called

a. separation plate
b. transition plate
c. theoretical plate
d. bubble plate

A

Theoretical Plate

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2
Q

Poor performance in large packed towers is due mainly to

a. poor packing
b. cavitation
c. inefficient heat transfer
d. channeling

A

Channeling

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3
Q

The unit operation for separating a particular gaseous component from a mixture of gases due to difference in solubility of the gases in a liquid phase is

a. adsorption
b. extraction
c. absorption
d. distillation

A

Absorption

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4
Q

A berl saddle is used so that

a. on can easily ride a horse
b. to increase mass transfer rate
c. to reduce a personal problem
d. to increase heat transfer rate

A

To increase mass transfer rate

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5
Q

The greater the surface area of the packing of the fractionating or absorption column,

a. the greater its efficiency
b. the lower its efficiency
c. efficiency does not depend on the surface area of the column
d. the faster the distillation proceed

A

The greater its efficiency

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6
Q

The ordinate in a psychrometric chart is

a. absolute humidity of dry air
b. saturation temperature
c. absolute humidity if humid air
d. dry bulb temperature

A

Absolute humidity of humid air

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7
Q

An operation where warm vapor mixture is cooled such as by contact with a liquid resulting in condensation and decreased humidity is

a. evaporation
b. dehumidification
c. humidification
d. extraction

A

Dehumidification

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8
Q 
The ratio of the partial pressure of water vapor to the vapor pressure of water is
a. equilibrium moisture
b absolute humidity
c. relative humidity
d. critical moisture
A

Relative Humidity

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9
Q

The temperature at which the moisture content of humid air exerts a partial pressure of its vapor pressure is the

a. saturation temperature
b. ambient temperature
c. critical temperature
d. dry bulb temperature

A

Saturation Temperature

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10
Q

Which statement is true?

a. RH < %H
b. RH > %H
c. RH = %H
d. none of these

A

RH > %H

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11
Q

The ____ of a saturated gas phase equals the gas temperature

a. Wet Bulb Temperature
b. Dew Point Temperature
c. Dry Bulb Temperature
d. Adiabatic Saturation Temperature

A

Wet Bulb Temperature

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12
Q

If the partial pressure of the vapor in a gas-vapor mixture is for any reason less than the equilibrium vapor pressure of the liquid at the same temperature, the mixture is

a. saturated
b. supersaturated
c. unsaturated
d. concentrated

A

Unsaturated

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13
Q

The maximum number of plates for a given distillation system is obtained at

a. variable reflux
b. maximum reflux
c. minimum reflux
d. optimum reflux

A

Minimum Reflux

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14
Q

In a fractionation, an increase in reflux ratio

a. increases the number of theoretical plates
b. decreases the reboiler duty
c. increases the amount of distillate
d. increases the condenser duty

A

Increases the condenser duty

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15
Q

The triangle whose one corner coincides with the enriching line and the other corner is on the stripping line, is called the ____

a. feed plate
b. partial condenser
c. ideal stage
d. middle plate

A

Feed plate

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16
Q

In a distilling column, the highest pressure will be at

a. the top
b. the feed plate
c. the bottom
d. between the feed plate and the top

A

The bottom

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17
Q

When the feed to the column is a saturated liquid, the feed line is

a. vertical
b. inclined to the left
c. horizontal
d. inclined to the right

A

Vertical

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18
Q

In a binary distillation, the first component to condense in the distillate flask will be

a. the one with lower MP
b. the one with higher MP
c. the one with lower BP
d. the one with higher BP

A

The one with higher BP

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19
Q

Liquid-liquid extraction is possible when there is a difference in this property of a given solute between two immiscible solvents.

a. viscosity
b. vapor pressure
c. solubility
d. temperature

A

Solubility

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20
Q

Crystallization occurs in a solution that is

a. concentrated
b. supersaturated
c. unsaturated
d. saturated

A

Supersaturated

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21
Q

To increase the life of an incandescent lamp it is

a. filled with Neon gas
b. filled with CO2 gas
c. filled with Argon gas
d. evacuated

A

Filled with Argon gas

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22
Q

Lanolin is widely used in cosmetics, it is derived from ____.

a. cottonseed oil
b. sheep’s wool
c. coconut oil
d. palm oil

A

Sheep’s wool

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23
Q

One ingredient present in all baking powder is

a. sodium citrate
b. sodium bicarbonate
c. sodium betabisulfate
d. potassium tartrate

A

Sodium Bicarbonate

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24
Q

Common microorganism used for penicillin manufacture is

a. mold
b. protozoa
c. bacteria
d. algae

A

Mold

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25
Q

An example of water soluble is

a. vitamin C
b. vitamin E
c. vitamin A
d. vitamin K

A

Vitamin C

26
Q

The main raw material in Solvay process is

a. soda ash
b. ammonia
c. ethyl alcohol
d. limestone

A

Ammonia

27
Q

Design based on conditions giving the least cost per unit time or maximum profit per unit of production

a. limit
b. optimum economic design
c. break even
d. plant design

A

Optimum Economic Design

28
Q

A control structure with two feedback controller with the output of the primary controller changes the set point of the secondary controller whose output goes to the final controller.

a. feedforward control
b. cascade control
c. ratio control
d. override control

A

Cascade control

29
Q 
Which control system is used for multi-input, multi-output system?
a. cascade control
b feedbackward control
c. feedforward control
d. model predictive control
A

Model predictive control

30
Q

Archimedes principle states that

a. the weight of object submerged is equal to the weight of the liquid displaced
b. the buoyant force on an object in a fluid is equal to the weight of the fluid the object displaces
c. the buoyant force on an object in a fluid is equal to the weight of the object
d. the weight of the object that protrudes above the surface of the liquid is equal to the buoyant force

A

The buoyant force on an object in a fluid is equal to the weight of the fluid the object displaces

31
Q

An increase in reflux ratio causes a/an _____ in the concentration of the more volatile component in the distillate.

a. change
b. decrease
c. increase
d. none of these

A

Increase

32
Q

Which of the following number is not involved in heat transfer?

a. reynold’s number
b. prandtl number
c. sherwood number
d. nusselt number

A

Sherwood Number

33
Q

Dimensionless number defined as the ratio of inertial force to viscous forces.

a. reynold’s number
b. prandtl number
c. sherwood number
d. nusselt number

A

Reynold’s Number

34
Q

The drag coefficient at creep flow is

a. 16/Re
b. 24/Re
c. 64/Re
d. 32/Re

A

24/Re

35
Q

Which of the following is an incompressible fluid?

a. water
b. LPG
c. steam
d. air

A

Water

36
Q

The system used to remove condensable vapor from a flammable or toxic mixture by passing them through a pool of liquid in a vessel

a. flare
b. quench tank
c. arresters
d. blow-down drums

A

Quench Tank

37
Q

For the complete corrosion resistant stainless steel, the minimum percentage chromium in the alloy required is

a. 1.1 %
b. 8.3 %
c. 3.2 %
d. 11%

A

11%

38
Q

A Tyler screen series is characterized by

a. square root of two ratio of areas between successive screens
b. square root of four ratio of linear openings between successive screens
c. two times the area ratio between successive screens
d. none of the above

A

Two times the area ratio between successive screens

39
Q

A mass transfer operation in which component from a solid phase is separated from the solid using an appropriate solvent.

a. adsorption
b. leaching
c. electrodialysis
d. equilibrium stage

A

Leaching

40
Q

What is the process used in making newsprint?

a. soda process
b. sulfite process
c. mechanical pulp process
d. sulfate process

A

Mechanical Pulp Process

41
Q

In some reaction operation, bypassing some amount of the reactants prevent wasteful processing. To determine the amount of bypass, it is essential that a material balance be taken

a. inside the reactor
b. at the feed
c. at overall output and input materials
d. around a point where mixing occurs

A

Around a point where mixing occurs

42
Q

In a heat exchanger, the fundamental types of heat transfer normally considered are

a. radiation and conduction
b. radiation and conduction
c. conduction and convection
d. heat fluxes

A

Conduction and Convection

43
Q

As the upper interface approaches the sludge building up on the bottom of the container, the density and viscosity of the suspension surrounding the falling particles ___ with a corresponding decrease in settling velocity.

a. increases
b. decreases
c. remains the same
d. none of the above

A

Increases

44
Q

When logs are burned in a furnace, they burn quietly. However, when wood dust is thrown in the same furnace, an explosion occurs because

a. the concentration of oxygen is increased
b. the pressure change shifts the reaction to the right
c. a catalyst is present in the wood dust
d. the reactant surface is increased

A

The reactant surface is increased

45
Q

The moisture content existing at the end of the constant rate period.

a. critical moisture content
b. equilibrium moisture content
c. free moisture content
d. bound moisture content

A

Critical moisture content

46
Q

A device which controls the flow of refrigerant manually

a. capillary tube
b. gate valve
c. rotation valve
d. expansion valve

A

Gate Valve

47
Q

For a successful clarification, the settling velocity of the particle must be somewhat ___ than the vertical velocity of the fluid at that level.

a. less
b. equal
c. greater
d. none of these

A

Greater

48
Q

Metallurgical processes that utilize high temperatures are collectively called

a. hydrometallurgy
b. electrometallurgy
c. pyrometallurgy
d. alloying

A

Pyrometallurgy

49
Q

Process variable in a process must be measured and then controlled and integrated for ___ processing condition.

a. actual
b. fast
c. optimum
d. automatic

A

Optimum

50
Q

in the process of mercerizing cotton, cotton is treated with

a. phosphoric acid
b. ammonia
c. acetone
d. sodium hydroxide

A

Sodium Hydroxide

51
Q

The concept of using information about the deviation of a system form a desired state of control

a. proportional control
b. feedback control
c. integral control
d. transient

A

Feedback control

52
Q

It involves the transfer of a soluble component of a gas phase into a relatively nonvolatile liquid absorbent.

a. gas absorption
b. distillation
c. liquid extraction
d. stripping

A

Gas Absorption

53
Q

Multiple effect evaporation _____

a. increases the steam requirement
b. decreases the rated capacity
c. increases the steam economy
d. decreases the heat transfer rate

A

Increases the steam economy

54
Q

Delay in time it takes the process variable to reach a new value when load changes occur

a. time delay
b. dead time
c. process lag
d. dynamic error

A

Process Lag

55
Q

_____ is the addition of water to facilitate extraction of sugar cane juice.

a. maceration
b. hydrolysis
c. solvation
d. massecuite

A

Maceration

56
Q

A highly vitreous product obtained from limestone, sand and clay is _____.

a. earthenware
b. glass
c. structural bricks
d. enamel

A

Glass

57
Q

The main chemical constituent in salt cake is ____.

a. sodium carbonate
b. sodium nitrate
c. sodium sulfate
d. sodium phosphate

A

Sodium sulfate

58
Q

In filtration operation involving incompressible cake, the flow rate is directly proportional to

a. viscosity of the filtrate
b. the thickness of the filter cake
c. the pressure applied
d. the size of cake particles

A

The pressure applied

59
Q

During the filtration of the slurry, the filtration rate will fall once the pressure drop ____.

a. is increased
b. is —–
c. is maintained constant
d. none of these

A

Maintained constant

60
Q

Increasing the operating pressure of a distillation column

a. does not make a difference in component separation
b. makes separation difficult
c. sharpens separation
d. requires less heat in the feed heater

A

Makes separation difficult

61
Q

For a gas diffusing in a stagnant layer of another gas, the concentration decreases ___ along the diffusion path.

a. linearly
b. logarithmically
c. geometrically
d. proportionally

A

Logarithmically

62
Q

105

A

105

ChEP (4 decks)

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