Concepts Flashcards
(Design) It is the ability to resist deformation or deflection . A. Strength B. Stiffness C. Toughness D. Hardness
B. Stiffness
(Instrumentation) He suggested that pressure sensors may be divided into four categories, namely, utility, general industry, process control and precision and test. A. Pascal B. Toricelli C. Saunders D. Bourdon
C. Saunders
(Distillation) For a non-azeotropic solution being distilled, the temperature in the distillation column, from bottom to top\_\_\_\_\_. A. Increases B. Decreases C. Becomes Maximum D. Becomes constant
B. Decreases
(Distillation) Compounds that form an azeotrope may be separated through distillation by\_\_\_\_ A. adding a separating agent B. increasing the temperature C. increasing the pressure D. A and C
D
(Thermodynamics) Which of the following has the highest entropy at a certain condition? A. Dichloromethane B. Moist Air C. Ice D. Water Vapor
B. Moist Air
Gas = higher entropy
mixture = higher entropy
(CheCal) It is an improvement in power loss by another device thus it is mostly used in cases where there are very large flow rates. A. manometer B. rotameter C. turbine meter D. venturi meter
D. Venturi Meter
(Diffusion) Diffusion that takes place in fluid phases by physical mixing and by eddies of turbulent flow. A. Eddy diffusion B. Forced Diffusion C. Thermal Diffusion D. Reversed Diffusion
A. Eddy Diffusion
- Which of the following is false?
A. diffusion occurs in at least one phase of many mass transfer operations
B.one valid assumption in steady state diffusion is that concentration at any point changes with time as the process proceeds
C. the theory of diffusion is assumed in the direction perpendicular to the interface despite the random movement of molecules in all directions
d. Fick’s law states that the diffusion flux J_a is proportional to the concentration gradient dca/db using the diffusivity of the component A and its mixture with component B
B
(Diffusion)
which of the following is a valid type of diffusion?
A. only one component of the mixture is transferred to and from the interface and the flow is the same of the flow of the particular component
B. the diffusion of one component in a mixture is balanced by an equal and opposite molar flow of another component,thus, there is no molar net flow
C. two components diffuse in different directions but the molar flows are unequal
D. all of the above
D.
“ A is one way diffusion letter, b is equimolar counter diffusion and c is uneven counter diffusion”
(Diffusion) the ratio of the convective mass transfer rate to the diffusion rate A. Sherwood B. Prandtl C. Nusselt D. Schmidt
A.
(Diffusion) for laminar flow the reynolds analogy is exact if A. pressure gradient = 0 B. schmidt number = 1 C. Prandtl number = 1 D. all of the above
D.
(Diffusivity) When a drop of blue liquid is added to a cup of water then mixed using a spoon what type of mass transfer or occurs? A. molecular diffusion B convective mass transfer C. thermal diffusion D. both a and b
D.
(ChE Thermo) which of the following cycles has two isobaric steps A. otto B. diesel C. stirling D. ericsson
D. Ericsson
(ChE Thermo) which of the following cycles has no isentropic steps A. carnot B. diesel C. brayton D. stirling
D. Stirling
(ChE Thermo) which of the following has higher isentropic work than the actual ? A. turbine B. pump C. compressor D. condenser
A. Turbine
(ChE Thermo) which of the following ideal gases has the highest value of γ A. methanol B. nitrogen C. neon D. water vapor
C. Neon (monoatomic)
(ChE Thermo)
which of the following is false about a bomb calorimeter
A. the heat is equivalent to enthalpy
B. it operates at isochoric condition
C. it can withstand combustion reactions D. all of the statements are true
A.
It should be delta U
(ChE Thermo)
which has the largest numerical value for a work due to expansion at a constant temperature?
A. free expansion
B. expansion against a constant pressure P_2
C. reversible expansion going to a pressure P_2
D. all have equal value for work
C
(ChE Thermo)
which of the following is false about the change in enthalpy of a gas at isobaric condition?
A. the value is positive if internal energy is positive and if the volume is increased
B. the value is positive if internal energy is positive and if the temperature is increased
C. the value is negative if internal energy is negative and if the volume is decreased at high p
D. all statements are true
D
ΔH=ΔU+PΔV
A. (+)= (+)+(+)(+) correct
B. (+)= (+)+(+)(+) correct
C. (-)= (-)+(+high)(-) correct
(ChE Thermo)
which of the following is true about complete combustion of methane?
A. it requires -890 kilojoules of heat to burn completely and to produce water vapor
B. for every mole of methane, 2 moles of water vapor are consumed
C. a heat value of 445.15 kilojoules is released accompanying the formation of two moles of O2
D. none of the above
D
(ChE Thermo) in coffee cup calorimetry where the heat of solution is obtained what is the system? A. the solution formed B. the dissolution process C. the reacted salts D. all of the above
B
(Diffusion)the enrichment of ethyl alcohol in the vapor phase from an aqueous ethyl alcohol solution during rectification is an example of
a. unicomponent diffusion
b. equimolal counter diffusion
c. phase drift
d. convective diffusion
B. Equimolal counter diffusion
(Diffusion)the diffusivity of a binary system as given in the equation of Fick’s law is usually measured relative to the
a. stationary observer
b. velocity of the earth as it rotates around the sun
c. mass-mean velocity of component A
d. volume-mean velocity of components B and A
D.
(Diffusion)the diffusivity of component A relative to itself, that is D_AA
a. has no physical meaning
b. has a physical meaning but cannot be measured
c. has a physical meaning and can be measured
d. is beyond comprehension
C
(Diffusion)the reynolds analogy is applied when
a. the reynolds numbers less than 2,100
b. the Prandtl number is unity
c. the prandtl number is not equal to 1
d. no mass transfer is involved
B
(Diffusion)the molar flux of component A in molecular diffusion is independent of
a. mass transfer area
b. concentration gradient
c. total pressure
d. temperature
A
(Diffusion)a dimensionless number that represents the ratio of the mass transfer by the molecular diffusion to the total mass transfer is
a. sherwood number
b. reynolds number
c. schmidt number
d. none of these
D.
(Diffusion)the molar diffusion flux of A relative to a stationary plane is a combination of
a. N_a + N_ b + molecular diffusion
b. fick’s law of diffusion and diffusivity
c. phase drift + molecular diffusion
d. bulk diffusion and pressure diffusion
C.phase drift is also convective flux
(Diffusion)the fick’s law of diffusion gives the rate of diffusion based on
a. pressure driving force
b. temperature driving force
c. concentration driving force
d. all of these
C.
(Diffusion)equimolar counter-diffusion means that the
a. bulk in terms of mass is not moving
b. concentration driving force is zero
c. convective flux is very high
d. bulk in terms of moles is not moving
D.
(Diffusion)for a gas phase diffusion, unicomponent diffusion through a gas-liquid interface will likely occur if
a. one component is soluble and the other is not
b. both components are soluble in the solvent
c. both components are insoluble in the solvent
d. none of these
A
(Diffusion)the rate of mass transfer of component A through an interface in a turbulent flow system is less affected by
a. concentration of gradient A
b. mass transfer area
c. thickness of the laminar film adjacent into the interface
d. the flow rate of gas and liquid
D
(Diffusion)for binary unicomponent diffusion, the concentration profile of the diffusing component along the diffusion path is
a. linear
b. quadratic
c. logarithmic
d. none of these
C
(Diffusion)the transport analogy among mass, heat and momentum transfer is complete when
a. the temperature gradient and concentration gradient are equal
b. no convective flux or phase drift is involved
c. the resistance to mass and heat transfer are negligible
d. the momentum transfer rate is negligible
B
(Diffusion)a wetted wall column is usually used to determine mass transfer coefficient experimentally because
a. the mass transfer area can be measured accurately
b. the concentration gradient can be measured accurately
c. there is no better device to use
d. it is an inexpensive piece of equipment
A
(Diffusion)it provides the basis for the quantitative description of the diffusional phenomena of molecules
a. stokes-einstein postulation
b. kinetic theory of gases
c. thermal diffusion
d. potential theory
B
(Diffusion)the method of solute transfer which involves rapid movement of large chunks of fluid in turbulent motions
a. molecular diffusion
b. eddy diffusion
c. thermal diffusion
d. kinetic transport
B
(Diffusion)ammonia (A) being absorbed from air(B) into water is an example of
A. steady state equimolar diffusion
B. steady state unicomponent diffusion
c. steady state diffusion in multicomponent mixtures
d. unsteady-state equimolal diffusion
B
(Diffusion)In steady-state equimolal counter diffusion, the following are true :
a. N_ b = 0; N_a constant
b. N_a = - N_b; N_a + N_b = 0
c. N_a = 0; N_ b is non-zero
d. N_a + N_b = constant
B
(Diffusion)the flux of A in uni component diffusion is different from that of equimolal counter diffusion because of
a. the molecular diffusion of A relative to a fixed point
b. the bulk motion of the phase
c. the concentration gradient of B is zero
d. the flux of A relative to the average molar velocity
B
(Diffusion)it represents the total mass transfer to mass transferred by molecular diffusion
a. sherwood number
b. schmidt number
c. reynolds number
d. nusselt number
A
(Diffusion)it is a measure of the diffusive mobility of individual molecules in solution
a. eddy diffusivity
b. diffusion coefficient
c. mass transfer coefficient
d. thermal diffusion
B
(Diffusion)based on the penetration theory the MTC will increase/ decrease by a factor of ____ if the contact time of the diffusing faces is tripled
a. 0.42
b. 0.21
c. 1.62
d. 0.5773
Dk_c = 2sqrt(D_v/(pi)(time))
(ChE Thermo) it is defined as the fraction 1/273.16 of the temperature of the triple point of water A. celsius B. fahrenheit C. kelvin D. rankine
C
(ChE Thermo) the amount of heat absorbed when CO2 gas reacts with the solid CaO to form solid CaCO3 is measured in a bomb calorimeter. the data obtained give a direct measure of A. ΔU B. VΔP C. ΔH D. Cp
A
(ChE Thermo) a refrigerant whose molecular formula is CBrF2CBrF2 is labeled as A. R-114 B. R-114a C. R-114B2 D. R-1142B
C
a unit operation wherein specific components of a fluid phase (gas or liquid) are preferentially adhered to the surfaces of the solid A. adsorption B. absorption C. chemisorption D. leaching
A.
(Adsorption) the adsorbent used in the purification of hydrocarbon products A. alumina B.bone char C. fuller's earth D. silica gel
D
(Adsorption) the component adsorbed in adsorption operation is called A. adsorbate B. adsorbent C. adsorbed materials D. chemisorption
A
(Adsorption) a type of adsorption which results in intermolecular forces of attraction between molecules of the solid and the substance adsorbed. A. gas phase adsorption B. liquid phase adsorption C. physical adsorption D. chemical adsorption
C
(Adsorption) physical adsorption is A. an irreversible phenomenon B. a reversible phenomenon c. accompanied by evolution of heat d. both b and c
D
(Adsorption) chemisorption (chemical adsorption) is A. the same as van der waals adsorption B. characterized by adsorption of heat C. also called activated adsorption d. none of these
C
(Adsorption) which of the following adsorbents is used to decolorize yellow glycerin A. silica gel B. alumina C. fuller's earth D. activated carbon
D.
(Adsorption)
freundlich equation applies to adsorption of solute from
A. dilute solutions over a small concentration range
B. gaseous solutions at high pressure
C. concentrated solutions
D. none of these
A
(Adsorption)
in case of physical adsorption the difference between heat of adsorption and heat of normal condensation is
A. equal to the heat of formation of surface compound
B. equal to the heat of wetting
C. 0
D. called integral heat of adsorption
B
(Adsorption)
pick out the wrong statement
Generally for physical adsorption, a gas of
A. higher molecular weight is adsorbed in preference to a gas of low-molecular-weight
B. high critical temperature is adsorbed in reference to a gas of low critical temperature
C. low volatility is adsorbed in preference to a gas of high volatility
D. both b and c
D
(Adsorption) the change in enthalpy per unit of adsorbed gas when adsorbed on a gas-free or outgassed adsorbent to form a definite concentration of adsorbate is called its A. integral heat of adsorption B. Heat of wetting C. differential heat of adsorption D. heat of normal condensation
A
keyword is definite concentration
(Adsorption)
with an increase in concentration of the adsorbate the integral heat of adsorption
A. increases
B. decreases
C. remains unchanged
D. may increase or decrease depends on type of adsorbate
B
(Adsorption) the change in enthalpy when a unit quantity of gas is adsorbed by a relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists is termed as) A. the differential heat of adsorption b. heat of wetting C. integral heat of adsorption d. heat of normal condensation
A
keywords are “change in enthalpy”
(Adsorption) as complete saturation of an adsorbent is approached the differential heat of adsorption approaches A. heat of normal condensation B. integral heat of adsorption C. 0 d. none of these
A
Ion-exchange process is similar to A. absorption b. extraction c. adsorption d. leaching
C
(Adsorption) CO2 can be adsorbed by A. hot cupric oxide B. cold calcium hydroxide C. adsorption D. heated charcoal
D
(Leaching)
when an undesirable component is removed from a solid with water the leaching process is called
washing
(Leaching)
copper salts are dissolved or leached from ground ores by _____ while cobalt and nickel salts are leached from their ores by ______
sulfuric acid or ammoniacal solutions
sulfuric acid-ammonia-oxygen mixtures
(Leaching)
gold this leached from its ore using an ________ and sodium hydroxide is leached from a slurry of calcium carbonate and sodium hydroxide prepared by reacting Na2CO3 with _____
calcium hydroxide
(Leaching) at equilibrium the concentration of the liquid retained by the solid leaving any stage is \_\_\_\_ the concentration of the liquid overflow from the same stage. A. higher than B. the same as C. lower than D. has no relationship to
B
(Leaching)
The underflow in leaching is consisting of
A. the inert solid and the retained solution
B. the solvent and the dissolved solute
C. the solution which is not retained by the inert solid
D. the inert solid
A
(Leaching)
the rate-determining step in leaching is
A. the dissolution of solute in solvent
B. the diffusion of solvent into the solid particles
C. the diffusion of solute towards the surface of the solid
D. the diffusion of solute from the surface towards the bulk of the solvent
C
(Leaching)
the overflow in leaching is consisting of
A. the inert solid and the retained solution
B. the solvent and the dissolved solute
C. the solution which is not retained by the inert solid
D. the inert solid
C
(Leaching) the N value for overflow is generally A. less than one B. greater than 1 C. equal to 1 D. equal to zero
D
(Leaching)
all of the following are assumptions in ideal leaching except which of the following?
A. the inert solid is not dissolved in the solvent
B. sufficient contact time is provided so that all solute is dissolved in the solvent
C. the concentration of solution in the final stage is equal to the concentration of solution in the initial stage
D. the solute is infinitely soluble in solvent
C
(Leaching) this leaching equipment is generally associated with the slowly rotating rake at the bottom of container A. thickener B. hilderbrandt extractor C. fixed-bed leaching D. bollman extractor
A
(Gas Abs) What is the pure solvent or dilute solution that is distributed over the top of the tower called? A. rich gas B. strong liquor C. lean gas D. weak liquor
D
(Gas Abs)
In packed column gas absorption, a transfer unit means that
A. a mole of solute is transferred in a unit height
B. the mass transfer coefficient will approach unity
C. the average driving force is equal to unity
D. low concentration range is equal to the average driving force
D
(Gas Abs) in gas absorption the use of liquid flow rate far above the minimum value will result in A. infinite number of plates B. fewer number of plates C. more number of plates D. none of these
B
(Gas Abs) at this point the entire column is filled with liquid and the gas now has to bubble through the liquid in the packing voids A. flooding-point B. loading point C. flooding velocity D. mass velocity
A
(Gas Abs) in a gas absorption packed tower the most economical gas velocity is considered to be \_\_\_\_\_ the flooding velocity A. equal to B. about half C. twice D. greater than
B
(Gas Abs) in a gas absorption column the pressure of the lean gas is expected to be \_\_\_\_ the pressure of the rich gas entering the column A. lower than B. higher than C. the same as D. double
A
(Gas Abs) which tray type is the cheapest and lowest pressure drop A. sieve tray B. bubble cap tray C. Valve tray D. packed column
A
(Gas Abs) for moderately soluble gases with relatively little interaction between the gas and liquid molecules which law applies most to establish equilibrium relationship? A. Raoult's Law B. Henry's Law C. Dalton's Law D. None of these
B
(Gas Abs)
in the choice of a solvent for gas absorption one of the properties to be considered is
A. solvent should have a low vapor pressure
B. solvent should have low boiling point
C. solvent should be highly viscous
D. solvent should be less expensive
A.
(Gas Abs)
in the case of a straight or concave downward operating line and the straight or concave upward equilibrium line, the minimum liquid rate is that at which
A. the operating line just touches the equilibrium line at the bottom of the tower
B. the operating line just touches the equilibrium line on top of the tower
C. operating line intersects the equilibrium line at the middle of the tower
D. the slope to the operating line is smaller than the equilibrium line
A
(Gas Abs)
when dilute solutions are involved in gas absorption one of the following is not applicable
A. henry’s law
B. H_L=V/S(k_y)a
C. equilibrium and operating lines are straight
D. N_G= Δy/(Δy)_LM may be used
B
(Gas Abs)
in gas absorption, packings are used
A. to reinforce the absorption tower due to drag created by the liquid and gas
B. to disseminate the heat generated to maintain isothermal conditions
C. to increase the area of contact between the gas in the liquid
D. to reduce the pressure drop created by the flowing gas
C
(Gas Abs)
when the liquid flow rate is fixed and the composition of the liquid and gas at the bottom of the absorption tower or fixed the limiting flow rate to give infinitely tall tower becomes
A. the maximum flooding velocity of the vapour
B. the minimum loading velocity of the liquid
C. the maximum flow rate of the vapor
D. the minimum flow rate of the vapor
D
(Gas Abs)
the rate equation in terms of the gas-phase mass transfer coefficient is used in design calculations instead of that in terms of the liquid phase when
A. the solubility of the solute in the solvent is very low
B. the controlling resistance is that of the liquid phase
C. the controlling resistance is that of the gas phase
D. the tie line is horizontal
C
(Gas Abs)
it is not very necessary to correct the rate equation for the phase drift encountered during gas absorption since the height calculated will be
A.slightly over designed anyway
B. slightly under designed anyway
C. based on equimolal counter diffusion anyway
D. based on the same percentage recovery anyway
A
(Gas Abs)
the overall height of a transfer unit based on the gas phase will equal the gas phase individual HTU, Hy when
A. the equilibrium curve is linear
B. the operating line is linear
C. the gas phase resistance is very small compared with the liquid phase
D. the liquid phase resistance is very small compared with the gas phase
D.
(Gas Abs) assuming that the penetration theory applies in an interfacial mass transfer contact, the liquid phase mass transfer coefficient will increase by a factor of \_\_\_\_\_\_\_ if the diffusivity of the solute becomes twice and the contact time becomes 1/2. A. 2 B. 1 C. 1/2 D. 4
A
(Penetration theory)
k=1.13√(Dv/t)
(Gas Abs) in a stripping or desorption operation the equilibrium curve is A. above the operating line B. below the operating line C. perpendicular with the tieline D.linear
A
(Gas Abs) Co-current gas - liquid up flow contacting device is highly characterized by A. low gas-liquid interaction regime B. dispersed bubble flow regime C. liquid rich and gas richh regime D. pulsing flow regime
B
(Gas Abs)
pressure drop is one of the most important parameters in the design of two phase co-current bed because
a. pumping cost could be a significant portion of the total operating costs
B. it may help characterize the hydrodynamics of the system
C. it may affect the retention of the liquid in the packed bed
D. all of these
D
(Gas Abs) flooding condition is the only consideration that dictates the minimum column diameter that can be used for a specified gas absorption in a packed column A. true B. false C. cannot be determined
B
(Gas Abs)
in gas absorption if the concentration are expressed in mole ratio, that is, moles of solute per mole of solute free medium it is necessary to assume that the operating line is straight when the coordinates are x and y
A. true
B. false
B
(Gas Abs)
in packed columns the pressure drop for irrigated packings is always greater than the pressure drop for dry packings because
A. the surface of dry packing is smoother
B. the flow area of dry packing is greater C. the drag friction is lesser than the skin friction for dry packing
D. none of these
B
(Gas Abs) the mechanism of mass transfer in a gas absorber is best described by A. penetration theory B. two film theory C. chilton colburn analogy D. surface renewal theory
B
(Gas Abs)
a wetted wall column is usually preferred over a packed column to determine mass transfer coefficient experimentally because for a wetted wall column ____ can easily be measured
A. the concentration gradient of A
B. the mass transfer area
C. the thickness of the laminar films adjacent to the interface
D. the flow rate of gas and liquid
B
(Gas Abs) in gas absorption, when the conditions at the bottom of the tower are fixed and the gas flow rate is given if the limiting flow rate based on equilibrium conditions that will require infinitely tall tower is A. minimum liquid flow rate B. maximum liquid flow rate C. minimum gas flow rate D. maximum gas flow rate
B
(Gas Abs) when the gas flow rate induces flooding in a packed column gas absorber this is best remedied if the percent recovery of the solute is to be maintained by A. reducing the liquid flow rate B. reducing the vapor flow rate C. increasing the diameter of the column D. increasing the height of the column
C
(Gas Abs)
when the two film theory is applied to gas absorption, the overall resistance can be expressed in terms of the individual resistances in the form 1/Kya=1/kya + m/kxa. this is possible because of one important assumption. this assumption is
A. the operating line is linear
B. the line has a slope between 0 and 1
C. the slope of the equilibrium curve near the tie line is linear
D. the solute forms an ideal solution with the solvent
C
(Gas Abs)
in a gas absorption tower mass transfer occurs primarily
A. from the liquid phase to the gas phase
B. from the liquid phase to the packing
C. from the gas phase to the liquid phase D. from the gas phase to the packing
C
it is a unit operation within which involves the mass transfer of soluble materials from the solid phase to the liquid phase A. absorption B. leaching C. desorption D. humidification
B
(Gas Abs)
the pressure drop along a packed tower is
A. inversely proportional to the mass flow rate
B. inversely proportional to the square of the mass flow rate
C. directly proportional to the mass flow rate
D. directly proportional to the square of the mass flow rate
D
the method of separating a particular gaseous component from a mixture of gases due to their differences in solubility in a liquid phase is A. adsorption B. extraction C. absorption D. distillation
C
(Gas Abs) the mass transfer rate of a material from one place to another across an interface is increased by \_\_\_\_ the difference between the bulk concentration of and the concentration at the interface between two phases A. Increasing B. Decreasing C. Keeping constant D. making zero
A
(Instru) it can result in the instrument giving erroneous readings as influenced by any physical obstruction, wear-and-tear or electrical fields. A. disturbance B. signal C. waveform D. noise
D
(Instru) it is a feature that prevents a machine from harming the operator or itself by making the state of two mechanisms mutual dependent to each other A. alarm B. magnet C. interlock D. safety switch
C
(Instru) another name for the Yamatake system A.SCADA B. android C. microsoft D. azbil
D
(Instru) it is a set of procedures that must be done to prevent accidental start-up of machines or equipment during maintenance or servicing activities A. machine guarding B. interlock system C lockout tagout D protective equipment
C
(Instru) it accounts for the difference between successive measured values under a single process condition A. reproducibility B. repeatability C. accuracy D. precision
D
(Instru) he suggested that pressure sensors may be divided into four categories namely: utility, general industry, process control and precision and test A. pascal B. toricelli C. saunders D. bourdon
C
(Instru) it is a system of software and hardware elements known in the industry that allows control of industrial processes either locally or at remote locations, monitoring, gathering and processing real-time data direct interactions with devices through HMI and records events into a log file. A. PLC B. SCADA C. DCS D. SAP
B
(Instru) a PI controller of a first-order process is subjected to a unit step input. if the integral constant is fixed, increasing the proportional gain will A. increase the overshoot B. increase the oscillation C. decrease the offset D. decrease the overshoot
D
(Instru) a PID control process has a highly oscillating response. the process can be stabilized by A. increasing proportional gain B. decreasing proportional gain C. increasing derivative time constant D. decreasing derivative time constant
B
(Instru) the integral of a dirac function is a A. ramp function B. step function C. impulse function D. pulse function
B
(Instru) in the control of pressure in a distillation column there is no need to include A. proportional control B. integral control C. derivative control D. automatic control
C
(Instru) a spring motion is described by the differential equation x''(t) + 5x(t) + 6x(t) = 0. the motion of the spring is A. overdamped B. underdamped C. critically damped D. undamped
A
(Instru) a PI controller of a first order process is subjected to a unit step input. if the integral constant is fixed decreasing the proportional gain will A. increase the overshoot B. increase the oscillation C. decrease the overshoot D. decrease the offset
A
(Instru) if a step function is applied to the input of a processes system and the output is of the form Y=e^t sint the system is A. stable B. unstable C. cannot be determined
B
(Instru) The range of value for K for a system with characteristic equation given by s^4+6s^3+11s^2+6s + K=0 is A. K>0 B. K<10 C. K>10 D. 0
D
(Instru) is the system with the transfer function Y(s) = (s-1)/(s+2)(s^2+4) stable or unstable? A. stable B. unstable C. cannot be determined
A
denominator has higher degree
(Instru) a control system in which the control action is somehow dependent on the output A. closed loop system B. open loop system C. feedforward control system D. deadtime compensator
A
(Instru) a property of a closed loop system which permits the output (or some other controlled variable) to be compared with the input of the system (or input to some other internal is situated component or subsystem) so that the appropriate control action may be formed as some fraction of the output and input A. feedback control system B. control system C.continuous-time D. bandwidth
A
(Instru) a frequency response measure of how well the system response to variations in input signal A. feedback B. control system C. continuous time D. bandwidth
D
(Instru) a signal defined at or of interest at only discrete (distinct) instance of the variable (upon which it depends) A. analog signal B. continuum time signal C. a digital signal D. sos signal
C
(Instru) a device that converts an analog or continuous signal to a discrete or digital signal A. analog to digital a/d converter B. digital to analog d/a device C. pressure to voltage converter D. discrete to continuous converter
A
(Instru) it is used to convert one signal or energy form into another A. transducer B. amplifier C. detector D. resistor
A
(Instru) the part of the deviation of the response which approaches zero as time approaches infinity A. steady state response B. output C. transient response D. frequency response
A
(Instru) the integral of a unit step function is also known as A. unit ramp function B. sinusoidal function C. unit impulse function D. transcendental function
A
(Instru)
when the total number of variables in a process is greater than the number of independent equations that can be set up the process is said to be
A. over specified
B. under specified
C. the degrees of freedom is 0
D. the degrees of freedom is less than zero
B
(Instru) a control structure with two feedback controllers with the output of the primary controller changing the segments of the secondary controller whose output goes to the final controller A. feedforward control B. ratio control C. cascade control D. override control
C
