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ChE Board Review > ChE Principles > Flashcards

ChE Principles Flashcards

1
Q

Which of the following is an example of pseudo plastic fluid?

a. apple sauce c. tap water
b. rubber latex d. sewage sludge

A

A. apple sauce

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2
Q

What controllers are frequently installed not because all modes of control are required but more of their versatility in systems which respond rather sluggishly?

a. PI Control c. PD Control
b. Integral Control d. PID control

A

B. Integral Control

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3
Q

What is the simplest type of control commonly expressed as having on/off position action?

a. Integral c. Bang-Bang
b. Manual d. Input-Output

A

C. Bang-Bang

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4
Q

In feedback control system for temperature control, a thermocouple measures the temperature and the output is fed to a controller. What results when one of the components known as a comparator compares a measured temperature value with desired value or set point?

a. Deviation c. Oscillation
b. Error d. Feedback

A

B. Error

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5
Q

In the gasification of coal to produce substitute natural gas, at what reaction zone is methane produced when some of the carbon is hydrogenated?

a. Distillation Zone c. Combustion Zone
b. Gasification d. Pyrolysis

A

B. Gasification

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6
Q

A scientist who used zeolites for water softening process.

a. Robert Gans c. Axel Cronstedt
b. Bob Guccione d. Joseph Culligan

A

a. Robert Gans

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7
Q

This type of flow-measuring device is typically used for highly corrosive fluids.

a. Rotameter c. Orifice meter
b. Coriolis flowmeter d. Magmeter

A

b. magmeter

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8
Q

What is the minimum temperature at which a vapor above a liquid will continue to burn once ignited?

a. Explosive limit c. Flammability limit
b. Fire point d. Flash point

A

B. Fire Point

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9
Q

The work done in a free expansion process is

A

Zero

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10
Q

In plant design, what is a protective response which is initiated upon detection of a process hazard?

A

Interlock

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11
Q

A disturbance which is externally applied to the system.

A

Perturbations

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12
Q

Which among the following is not an exothermic process?

a. Methanol synthesis c. Oxidation of sulfur
b. Catalytic cracking d. Ammonia synthesis

A

Catalytic cracking

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13
Q

It is most efficient process for hydrogen gas production which emits less amount of carbon.

A

Steam Reforming

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14
Q

Oil shale is an organic-rich fine-grained sedimentary rock also known as

A

Kerogen

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15
Q

Actual work delivered divided by theoretical work?

A

Turbine Efficiency

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16
Q

What happen to the particle when grinding limit is reached?

a. dust explosion c. change in shape
b. no change in particle size
d. it becomes powder

A

no change in particle size

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17
Q

Other name for Yamatake system

A

azbil

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18
Q

For a zero-order reaction, the ratio of the volume of a backmix reactor to the volume of a plugflow reactor, for the same reactant conversion and conditions, is:

A

1

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19
Q

A product of alumina and silica at high temperature.

A

kaolinite

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20
Q

A substance which can be readily converted into dye or other colored compound.

a. anlagen c. goitrogen
b. acrogen d. chromogen

A

Chromogen

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21
Q

Skirt supports are most suitable for:

a. Thick-walled vertical vessels c. Horizontal vessels
b. Thin spherical vessels d. Tall vertical vessels

A

Tall Vertical Vessels

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22
Q

A valve that controls flow by means of a disk or wedge-shaped dam sliding at right angles to the direction of flow and seating tightly in the valve body is a

A

gate valve

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23
Q

The friction factor for flow through a pipe with relative roughness of 0.004 at a Reynold’s No. of 80,000 is approximately equal to

A

0.03

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24
Q

The equation that relates friction factor and Reynold’s No., f=64/Reynold’s No. holds for

a. smooth pipes
b. laminar and turbulent flow
c. turbulent flow only
d. laminar flow only

A

d. laminar flow only

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25
Q

The enrichment of the vapor steam as it passes through the column in contact with the reflux during distillation is called

A

rectification

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26
Q

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

A

minimum reflux

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27
Q

For a cylinder where steady-state radial heat transfer takes place

a. the heat flux is constant
b. maximum heat transfer rate occurs at the surface
c. the heat transfer is constant
d. the temperature is uniform throughout the cylinder

A

c. the heat transfer is constant

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28
Q

Crystallization occurs in a solution that is

A

supersaturated

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29
Q

Mass transfer in a flowing fluid may be correlated by

a. Sherwood, Nusselt and Reynold’s No
b. Peclet, Reynold’s and Schimdt No
c. Sherwood, Reynold’s and Schimdt No
d. Prandtl, Schimdt and Reynold’s No

A

c. Sherwood, Reynold’s and Schimdt No

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30
Q

A device for increasing the velocity of a fluid in steady flow is a

A

nozzle

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31
Q

Which one among the following materials has the best insulating property?

window glass
wood
air
concrete

A

wood

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32
Q

Oil flows under laminar conditions inside a steam heated copper pipe. The overall heat transfer coefficient is approximately

A

equal to the heat transfer coefficient of the steam

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33
Q

On one side of a heat exchanger where either a condensing vapor or a boiling liquid is present, the temperature may be assumed to be constant. In determining the logarithmic mean temperature difference the direction of flow will have

A

significant effect

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34
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 of the liquid leaving the plate is called

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

A

d. bubble plate

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35
Q

Reactions whereby reactants proceed along several paths and give different products are

a. polymeric reactions
b. reversible reactions
c. parallel reactions
d. consecutive reactions

A

parallel reactions

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36
Q

For mass transfer to take place, there must be a

a. phase change
b. reaction component
c. concentration gradient
d. momentum gradient

A

concentration gradient

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37
Q

A carnot cycle consists of

A

two isothermal and two adiabatic process

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38
Q

This is also known as the volume fraction of the voids in packed beds.

A

porosity

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39
Q

Coolers and boilers are ordinarily operated at ________ condition.

A

isobaric

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40
Q

For an isolated system, maximum entropy will occur at

a. half-life
b. critical condition
c. equilibrium
d. start of the process

A

equilibrium

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41
Q

A measure of the ratio of the drag force acting on a unit area of the impeller & the inertial stress.

A

power number

42
Q

Which of the following can be adjusted by human operator in a closed feedback control loop?

set point
controller output
process variable
load variable

A

set point

43
Q

The thermocouple is based on the Seebeck effect which states that a/an _____ is generated when opposite junction of certain dissimilar pairs of wires are exposed to different temperatures.

current
temperature
emf
resistance

A

emf

44
Q

Dead time is a function of distance and

a. momentum
b. acceleration
c. time
d. velocity

A

velocity

45
Q

The parameter which completely describes the behavior of the response to a disturbance of a second order system is the

A

damping coefficient

46
Q

According to the first law of thermodynamics

A

Energy is neither lost nor gained in any energy transformation.

47
Q

The ratio of work performed by a system and the heat it absorbed from a reservoir is referred to

A

carnot efficiency

48
Q

Maximum work can be obtained from a system when the change taking place in it is

A

reversible

49
Q

Throttling process is

A

constant enthalpy process

50
Q

Work is a

a. property of the system
b. path function
c. state function
d. state description of a system

A

path function

51
Q

Neoprene is a

A

synthetic rubber

52
Q

Silicone is

a. thermoplastic
b. a monomer
c. an inorganic polymer
d. thermosetting plastic

A

an inorganic polymer

53
Q

Plasticizers are added to paints to

A

give elasticity and prevent cracking of the film

54
Q

Varnish does not contain

A

pigment

55
Q

Rancidity of oil can be reduced by

A

hydrogenation

56
Q

Molasses is a by product of raw sugar from the ______ process

A

evaporation

57
Q

Polyethylene is an example of _____________ polymerization

A

addition

58
Q

Principal chemical conversion in the production of resin from monomer.

A

alkylation

59
Q

Carbon black is added to rubber compounding as

A

activator

60
Q

Sulfur is undesirable in petroleum because

A

it causes engine knocking

61
Q

In the Philippines, sulfur for sulfuric acid manufacturing is sourced from _______ industry.

a. paper
b. cement
c. petroleum
d. detergents

A

Paper

62
Q 
Professional Regulations Commission was created under
P.D. No. 223
P.D. No. 233
P.D. No. 232
P.D. No. 826
A

P.D. No. 223

63
Q

Hydrogen sulfide is removed from water by contacting the solution with warm air. The operation is

Distillation
Leaching
Absorption
Stripping

A

Stripping

64
Q

What are the two contacting phase in leaching?

a. extract phase and raffinate phase
b. solvent phase and solute phase
c. feed phase and solvent phase
d. overflow and underflow

A

overflow and underflow

65
Q 
which of the following produces maximum pressure difference for transportation of gases?
vacuum pumps
blowers
fans
compressors
A

compressors

66
Q

The most economical valve for use with large diameter pipes.

A

butterfly valve

67
Q

To increase the life of an incandescent lamp is

A

filled with argon gas

68
Q

Trace metal that causes the Minamata disease.

A

Hg (Mercury)

69
Q

A criteria pollutant responsible for the reddish brown color of smog.

A

NO2

70
Q

It refers to waste or scrap glass, usually ground

A

Cullet

71
Q

From what mineral is radium obtained?

A

Pitch blend

72
Q

An apparatus used to measure atmospheric pressure.

A

barometer

73
Q

____ is normally used to determine the quality of combustion gases

A

Orsat Analysis

74
Q

Hydrogen in fuel which needs oxygen from air for its combustion is known as

A

Net Hydrogen

75
Q

Refers to the outgoing stream of noncombustible matter (ash), which separates from the materials that can be gasified.

A

Refuse

76
Q

Which of the following is true if the resulting combustible lost in refuse is coked coal?
A. has lost only its moisture
B. has lost both moisture and VCM content
C. has FC and VCM as its main constituent
D. the FC/VCM in green coal is equal to FC/VCM in refuse

A

B. has lost both moisture and VCM content

77
Q

A gas which contains saturated paraffin hydrocarbons.

A

Natural Gas

78
Q

Combined water is equal to

A

oxygen in the fuel

79
Q

Burning coke in a limited supply of oxygen can result in the formation of

A

CO

80
Q

When water in the products of combustion is in the vapor state, the heating value is

A

lower heating value

81
Q

It refers to the internal heat from the earth

A

geothermal

82
Q

It is usually applied to cooling below ambient temperature.

A

refrigeration

83
Q

Carbonate, or temporary hardness, is caused by bicarbonates of

A

calcium and magnesium

84
Q

It is the term applied to processes which remove or reduce the hardness of water.

A

softening

85
Q

It is a linear polymer which may reversible softened by heat and solidified by cooling.

A

thermoplastics

86
Q

The statement where electrons are added to orbitals of equal energy, a single electron will enter each orbital before a second one enters any one orbital, with the spins remaining parallel if possible.

A

Hunds rule

87
Q

A relation stating that when two relations are added to give a third reaction, the corresponding enthalpies of reaction must also be added.

A

Hess’s law

88
Q

The amount the system output response proceeds beyond the desired response

A

overshoot

89
Q

if the pressure recovery experienced by the liquid is enough to raise the pressure above the vapor pressure of the liquid , then the vapor bubbles start collapsing or imploding. the implosion is called

A

cavitation

90
Q

Third aspect in plant design

A

environment

91
Q

A device used for the classification of particles in size ranges below 10 micrometer.

A

centrifuge

92
Q

It is an alloy containing copper and zinc

A

Brass

93
Q

A type of screening equipment operated with a shaking motion, a long stroke at low frequency

A

reciprocating screens

94
Q

Which of the following filter media can be trapped particles of size 0.005 micrometer?

A

membranes

95
Q

An equipment used to separate liquids where there is a sufficient differences in density between the liquids for the droplets to settle readily

A

decanters

96
Q

A pipe has 2 inch inlet and has a 4 inch outlet, the mass flow ratio of the inlet is___ to that of the outlet.

A

equal

97
Q

Point velocities can be measured using

A

pitot tube

98
Q 
Which of the following has the highest thermal conductivity?
A. mercury 
B. gasoline 
C. water 
D. alcohol
A

A. Mercury

99
Q

What happens to the thermal conductivity of diatomic gases if the temperature is increase?

A

it will also increase

100
Q

The boiling point of a given solution is a linear function of a boiling point of pure water at the same pressure

A

Duhring’s rule

ChE Board Review (5 decks)

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