Nov 2019 Flashcards
What chemical known as oxygen scavenger is used for the complete deoxygenation of boiler feed water to minimize corrosion in high-pressure high-temperature bailers?
A. Sodium sesquiphosphate
B. Sodiun hypochlorite
C. Sodium sulphite
D. Sodium trisilicate
Sodium sulphite
In ordar to avoid the substantial cost of installing high-pressure tubes, what is used in the design and operation of high-temperature reactors?
A. Reactor off gases
B. Low grade fuels
C. Heat transfer fluids
D. Cryogenic fluid
Heat transfer fluids
Based in the rheological behavior of fluids what is the term for some fluids that do not slow at all until a threshold stress level is attained?
A. newtonian
B. dilatant
c. Bingham plastics
D. rheopectic
Bingham plastics
What is the importance of sodium hexametaphosphate conditioning of high pressure boiler water?
A. Inhibits calcium carbonate precipitation
B. Maintains high alkalinity level to prevent acid corrosion
C. Facilitates magnesiu carbonate precipitation
D. Aids in the removal cf sitica
Inhibits calcium carbonate precipitation
In chemical engineering with regards to reactor design, what is the concern referred to with the question: What changes can we expect to occur?
A. Unit operations
B. Thermodynamics
C. Chemical Reaction
D. Nuclear reaction
Chemical Reaction ?
What defines the virial coefficients shown in the equation as follows?
PV/nRT = 1 + B/(v/n) + C/(v/n)^2 + D/(v/n)^3 + …
A. Each is a function of temperature and independent of pressure
B. Each is dependent on temperature and pressure
C. Each is dependent on the temperature and composition of gas mixture
D. Each is independent of temperature only
Each is dependent on the temperature and composition of gas mixture
What exists in a steam boiler operation?
A. Generation of kinetic energy of turbulence and rate of dissipation are not the same
B. There is local equilibrium
c. Convection heat exchange is the main mechanism of heat transfer
D. Supersaturation temperature of water is achieved
Convection heat exchange is the main mechanism of heat transfer
Vanilla comes from the inmature fruit of a plant with the scientific
name Vanilla Planifolia. what kind of plant is it?
A. Tree
B. Orchid
C. Shrub
D. Grass
Orchid
What form of control mode is added to the proportional control where the derivative section responds to the change of the error signal and NOT amplitude?
A. Rate control
B. Microprocessor
C. Automatic reset
D. Integral action
Rate control
considering a substance B with constant thermal conductivity, what would be the expression of the thermal resistance if the steady state flow is perpendicular to the slab based on Fourier’s Law?
A. R=BkA
B. R=AB/k
C. R=B/kA
D. R= (B/A)k
R=B/kA
In the use of refractory materials a mixture of silica and alumina form a eutectic at what condizion?
A. 96.0% Si02 at 1,900 degC
B. 92.5% Si02 at 1,650 deg
C. 97.5% Si02 at 1,355 degc
D. 94.5% Si02 at 1,545 degc
94.5% Si02 at 1,545 degc
Who described temperature as “the thermal state of a body considered with its ability to communicate heat to other bodies”?
A. Zeroth
B. Ludwig Bolztmann
c. James Clerk Maxwell
D. lord William Thompson Kelvin
maxwell or boltzmann?
When designing a reactor what must be considered in searching for the optimum efficiency?
A. Economics of over-all process
B. Alternatives for the process
C. Cost of reactor
D. Treatment cost of materilas and wastes
Economics of over-all process
In general terms what is the most significant feature of a SCADA system known as industrial control system to control infrastructure processes, facility-based properties and industrial processes?
A. It controls processes in real time
B. It does not need a human operator for the processed data
C. It does not control processes in real time
D. It is referred to as the system
that coordinates the processes in real time
(chatgpt answer)
It controls processes in real time
Which of the following with regards to the variables DOES NOT affect the progress of homogenous reactions?
A. The pressure is fixed given the temperature and composition of the phase
B. Temperature, pressure and composition are independent.
C. The surface property of solid materials in contact with the phase
D. Container shape of the reactor and the diffusional characteristics of the fluid feed.
(chat gpt)
The surface property of solid materials in contact with the phase
In a combination of metals, what happens if the following substances such as CI-, OH-, NO3 or NHA4 are present?
A. Stress cracking
B. Pitting
C. Intergranular corrosion
D. Erosion-corrosion
Intergranular corrosion
What happens to delta U when work is done by the system during the adiabatic expansion of ideal gas?
A. Zero
C. No charge
B. Increases
D. Decreases
(doubtnut.com answer)
Decreases
Though it may be difficult to determine the dominant basic pattern in the application of force to break a particle, what pattern is brought about by the disintegration of the particle by two rigid forces?
A. Fluid or particle-particle interaction
B. Attrition
C. Compression
D. Impact
(science direct answer)
Compression
Which of the following is the correct statement with regards to acoustical velocity?
A. The velocity of sound moves through a continuous material medium.
B. The motion of the sound wave is an ever changing entropy process.
C. The sound wave moves to overcome the fraction in the medium.
D. It is the velocity of a large compression-rarefaction wave.
(chegg answer)
The velocity of sound moves through a continuous material medium
What theory applies to the mass transfer controlled systems where the membrane permeation rate is independent of pressure?
A. Boundary-layer
B. Laminar and turbulent flow correlation
C. Solute precipitation
D. Flux paradox
(chatgpt answer)
Boundary-layer
Gas to liquid (GIL) technology has been developed by chemical engineers to convert natural gas to gasoline or diesel fuel from natural gas recovered from oil wells which before was flared off and wasted. What is the most important aspect of this process compared to producing gasoline or diesel fuel from crude oil?
A. The fuel is sulfur free
B. Relatively low investment. cost
C. It is a cheaper process
D. Does not emit greenhouse gases
(lee-enterprises.com answer)
The fuel is sulfur free
When vapor bubbles are generated on the heating surface and they rise through the liquid and leave the surface is known as
A. Boiling of saturated liquid
B. Boiling and condensing
C. Superheat boiling
D. Subcooled boiling
(chatgpt answer)
Boiling of saturated liquid
Of the three volume roots of the cubic equations of state which may be complex, and lying below and above the saturation pressure, the smallest root is liquid-like and the largest is vapor-like, what can describe the third one lying between the two values?
A. Supersaturation pressure
C. Metastable state
B. Two-phase region
D. Insignificant
(chatgpt answer)
Metastable state
What makes the integral method different from the differential method of analyzing kinetic data?
A. It is more useful in more complicated situations but require s more accurate data.
B. The rate expression is tested whether it fits to the data directly.
c. A particular form of the equation is guessed and predicts that the plot of data results in a straight line.
D. It is more difficult to use.
(chatgpt answer)
The rate expression is tested whether it fits to the data directly.
What property of components of a feed material is flash distillation NOT effective in separating the components?
A. Highly concentrated
B. Widely different boiling points
C. Comparable volatility
D. Colloidal
(chatgpt answer)
Colloidal
What mode of control is emsloved wherein the greater the magnitude of
error the larger is the corrective action applied?
A. Proportional
B. Integral
c. Derivative
D. Automatic
Proportional
What makes the resistance temperature detector (RTD) different from the thermistor?
A. The resistance/temperature relationship is highly linear
B. The maximum temperature range is between 1,300 K to 2,000 K
C. The negative and positive temperature coefficients
D. RID probes are more sensitive than thermistor probes
The maximum temperature range is between 1,300 K to 2,000 K
Thermodynamic properties of fluid are often evaluated from measurements of molar volume as a function of temperature and pressure yielding PVT relationships. How should this be expressed mathematically?
A. Quantitative determination of real-fluid behavior
B. Equations of state
c. Stoichiometric expressions
D. Generalized correlations
(chatgpt answer)
Equations of state
In the process of compressible flow, what is known as the origin of the gas?
A. Reservoir
B. Gas holder
c. Pocket
D. Aquifer
Reservoir
which of the following is one of the drying substances in the
dehydration and sweetening of natural gas?
A. Methanol
B. Polystyrene
C. Monoethanolamine
D. Sodium thiocyanate
Monoethanolamine
What is happening to the instantaneous fractional yield in single back mix reactors?
A. It remains constant
B. It varies with concentration
c. It decreases with holding time
D. It increases with holding time
It increases with holding time
What type of ultrasonic flowmeter is a counter-propagating type?
A. Time-of-flight
C. Venturi
B. Indirect
D. Doppler
Doppler
How is the ratio of expansion defined in any particular process?
A. It is initial volume divided by the final volume.
B. It is the highest pressure divided by the lowest pressure.
C. It is the total pressure divided by the highest pressure.
D. It is final volume divided by the initial volume.
It is final volume divided by the initial volume.
When a mixture of ethanol and water is distilled, the concentration of ethanol steadily increases until it reaches a limiting concentration of a mixture known as azeotrope. What is the significance of this particular mixture?
A. The composition of the vapor is 75% of the liquid.
B. No further enrichment occurs
C. Requires a long distillation time.
D. Additional plates are needed for separation.
(uomus.edu.iq)
No further enrichment occurs
What is the most significance of the Boltzman constant to the macroscopic and microscopic physics and ideal gas law?
A. Facilitates equilibrium.
B. Proves that heavier molecules have more energy.
C. It is the bridge.
D. Constant of proportionality.
It is the bridge.
