Oct 2021 Flashcards
Actual work delivered divided by the corresponding ideal work is known as ___ efficiency.
A. turbine
B. engine
C. process
D. system
turbine
what is the direct function of the range of an instrument which is the ratio of the upper range value of the Instrument to the lower range
value?
A. Range
B. Turndown
C. Span
Sensitivity
Span
Heat capacity is defined as C = dO/dT. What is the difficulty about the relationship of C to O which are supposedly state functions?
A. It Indicates that small temperature changes have smaller capacities
B. It is not an intensive property
C. It is a process dependent quantity
D. It presents heat as energy in transit
It is a process dependent quantity
Which of the following equations is applicable to V-notch weirs?
A. V/O = 2.505 (tan A/2)^0.996 H^2.47
B. V = 2.303 tan A( O/2H)H^2.47
C. V/O = 3.33 (L- 0.2H)^3/2
D. V = 3.55 (tan O/2)H^5/2
V/O = 2.505 (tan A/2)^0.996 H^2.47
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. PD control
B. PI control
C. Integral control
D. PID control
Integral control
In operating a batch filter, which of the following is the correct method of operation?
A. Keeping the pressure constant, the rate of flow increases.
B. Keeping the flowrate constant and gradually increase the pressure.
C. The particles forming the cake should be large.
D. The slower the flowrate, the more efficient the recovery.
Keeping the pressure constant, the rate of flow increases
Which of these equipment Iisted is classified as NON-proprietary as compared to proprietary?
A. Compressors
B. Pumps
C. Distillation columns
D. Centrifuges.
Distillation columns
Which of the following statements is NOT TRUE?
A. Specific molar volume and specific molar density are extensive thermodynamic variables.
B. Specific molar volume and molar density are quantities independent of system size.
C. Specific molar volume and specific molar density are intensive thermodynamic variables.
D. Specific molar volume and molar density are functions of composition of a system.
Specific molar volume and specific molar density are intensive thermodynamic variables.
Who introduced the first standard screw thread to give a measure of interchangeability between manufacturers as the need for standardization became important in plant design?
A. ISO
B. Whitworth
C. ANSI
D. Burklin
ISO
What also exists in forced convection though their effects are small?
A. External forces
B. Electromagnetic forces
C. Buoyancy forces
D. Drag forces
Buoyancy forces
Aside from pomace which is the residue left after pressing fruits for juice, what other residue which is the precipitate formed in wine vats, is processed for the domestic production of potassium acid tartrate?
A. Argols
B. Pearl ash
C. Pumice
D. Vinasse
(chatgpt answer)
Argols
At very low flow velocities of small particles in a fluid, what causes the wall shear?
A. Inertia
B. Densities
C. Gravity
D. viscosity
viscosity
If momentum transfer is analogous to conductive heat transfer resulting from a temperature gradient where thermal conductivity is the proportionality factor between the heat flux and temperature gradient what then is the proportionality factor between the momentum flux and the velocity gradient?
A. Direction of fluid flow
B. Density
C. viscosity
D. Wall shear
Density
at what condition in motion of a particle from a centrifugal force is the acceleration not constant?
A. the velocity of the particle relative to the fluid is directed Inwardly.
B. The velocity does not depend on the radius.
c. It is motion with respect to the fluid.
D. There is no change in the direction of the movement.
the velocity of the particle relative to the fluid is directed Inwardly
What is another hydrocarbon reservoir other than underground rock formations wherein natural gas can be found trapped within the crystalline structure of water similar to ice?
A. Methane hydrate
B. Bogs and marshes
C. Continental shelf
D. Coal beds
(oceanexplorer.noaa.gov)
Methane hydrate
What determines the degree by which each gas is absorbed in any mixture of gases?
A. Temperature changes
B. Miscibility
C. Concentration
D. Partial pressure
Partial pressure
Who suggested that pressure sensors be divided into four categories?
A. Strouhal
B. Saunders
C. Miller
D. Bourdon
(chatgpt answer)
Saunders
There is a misconception, particularly the idea that entropy represents the degree of disorder in a system. What differentiates the degree of disorder from entropy being dynamic, something which static scenes don’t reflect?
A. Dimensions in energy and reciprocal temperature
B. Enthalpy is only Involved when reactants turn into products
C. Chemical reactions always go towards completion
D. It is dimensionless
Dimensions in energy and reciprocal temperature
When designing a reactor what must be considered in searching for the optimum efficiency?
A. Cost of. the reactor
B. Alternatives for the process
C. Economics of over-all process
D. Treatment cost of materials and wastes
Economics of over-all process
Which of the following gives the most work we can get out of an adiabatic system?
A. Reversible compression
B. Irreversible expansion
C. Reversible expansion
D. Irreversible compression
Reversible compression
Gibb’s phase rule showed that the degrees of freedom is given by the equation F = 2- D+N.
Though this has been presented without proof, it is true for:
A. Frictionless processes
B. Non-reacting systems.
C. Systems in equilibrium
D. Fixed, states of pure homogeneous substance
Systems in equilibrium
For a gas-solids system, how many stages does the system tend to go through as the gas velocity in the fluidized bed is Increased?
A. 3
B. 5
C. 6
D. 4
(chatgpt answer)
4
As a safety precautionary measure in order to prevent operators in departing from the required sequence of operations such as plant start-up and shutdown, what are incorporated in process control systems?
A. Interlocks
B. Alarms
C. Tag-in/Tag-out
D. Safety switches
Interlocks
Which of the following statement/s is/are TRUE?
A: The Reynolds number is a measure of the ratio of inertial forces to viscous forces.
B: A friction factor is a dimensionless wall shear stress.
C: A simple eddy transport model for the turbulent shear stress predicts a constant friction factor.
A. A, C
B. A, B, C
C. B, C
D. A, B
A, B, C
In crystallization, what is known as the formation of nuclei attributable to the influence of existing macroscopic crystals in the magma?
A. Heterogeneous nucleation
B. Contact nucleation
C. Secondary nucleation
D. Fluid nucleation
Secondary nucleation
In setting out to optimize the engineering design of a system, what is considered as the overall objective in a chemical processing plant?
A. Maximize profits per unit time
B. The values of the variables that give optimum values of objectives
C. Minimize cost per unit of production
D. Social benefits and costs of pollution control
Minimize cost per unit of production
What is known as the ability of materials to resist bending and buckling being considered in construction which is the function of the elastic modulus of the material and shape of the cross-section of the member?
A. Toughness
B. Roughness
C. Stiffness
D. Hardness
Toughness
What does the equation X + Y 1/2R represent in a stoichiometric reaction?
A. combustion of carbon
B. supplied oxygen
C. theoretical oxygen
D. nitrogen in flue gas
(chatgpt answer)
theoretical oxygen
What is the main goal of Chaddock who defined design as the conversion of an ill-defined requirement?
A. satisfied customer
B. value for product
C. Quality above all
D. Concepts turned into actuality
(chatgpt answer)
Concepts turned into actuality
What makes high-calcium lime harden which happens only when It goes through this process?
A. Absorption of carbon dioxide from the air
B. Absorption with oxygen from the air
C. Evaporation of occluded water
D. Mixture with hydrated lime
Absorption with oxygen from the air
In the absence of molecular interactions on what property does the internal energy of the ideal gas depend only?
A. Temperature
B. Volume
c. Pressure
D. Pressure and volume
Temperature
While the Lang factors are quite old, they are still useful for checking estimates of process plant construction cost. which of the following Lang factor values is used for predominantly fluids processing plant as an oil refinery?
A. 5.12
B. 3.63
C. 3.10
D. 4.74
5.12
What differentiates an elementary reaction from a non-elementary reaction?
A. The two reactions are similar.
B. It makes possible to predict the rate law from the overall chemical equation.
c. Product of reaction is controlled by the limiting reactant.
D. The rate law from the overall chemical reaction cannot be predicted.
It makes possible to predict the rate law from the overall chemical equation.
Accuracy and reliability are important In measurement systems but errors still occur. What are considered as tolerable errors which are known and thus can be minimized?
A. Sensitivity variations
B. Consistently occurring
C. Incorrect action response
D. Randomly occurring
Consistently occurring
What stage of the process of progressive evaluation and selection for the final design is within the internal constraints in the design of a chemical manufacturing process?
A. Probable
B. Best
C. Plausible
D. Possible
Plausible
When the content of soluble material is removed in coarse, hard or granular feed solids and they disintegrate, in what form do they end up?
A. Granules
B. Pulp or mush
C. Mulch
D. Paste or adhesive
(chatgpt answer)
Pulp or mush
Who among the scientists mentioned applied zeolites to commercial use of water-softening in what is known as the Permutit water softening process?
A. Adams and Holmes
B. Robert Gans
C. Alex Fredrik Cronstedt
D. Thomas Clark
(chatgpt answer)
Robert Gans
