103-110 Flashcards by EGAÑA, SHEA P.

For packed column the main purpose of packing is to

A. strengthen the column
B. increase the pressure drop in the tower C. increase the surface area
D. reduce the flow rate across the column

C. increase the surface area

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In a gas absorption operation, when the operating line crosses the equilibrium curve

A. the NTU is zero
B. the gas flow rate is maximum
C. the liquid flow rate is maximum
D. the number of stages is infinite

D. the number of stages is infinite

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The overhead product composition decreases with time in

A. batch distillation with reflux
B. continuous distillation without reflux
C. continuous distillation with reflux
D. distillation operating with reflux

A. batch distillation with reflux

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For a binary mixture with low relativity, continuous rectification to get pure products will require

A. low reflux ratio
B. less number of trays
C. small cross section
D. high reflux ratio

D. high reflux ratio

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Chemisorption is

A. the same as van der Waals
B. an irreversible phenomenon
C. characterized by adsorption of heat
D. always in equilibrium

B. an irreversible phenomenon

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The stage efficiency in leaching depends on the

A. time of contact between the solid and the solution
B. rate of diffusion of the solute through the solid and into the liquid
C. both A and B
D. either A or B because these two mean the same thing

C. both A and B

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Disregarding the costs, which is the best solvent for the extraction of acetic acid from an aqueous solution at 25°C?

A. caproic acid
B. chloroform
C. 3-heptanol
D. toluene

C. 3-heptanol

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A chemical engineer who designed and built a new type of reactor and for three years, sold many units to the public can still patent his reactor.

A. TRUE
B. FALSE
C. not governed by law
D. it depends

A. TRUE

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In RA 318, a person who pass the Chemical Licensure Examination can take his/her oath as a chemical engineer if his/her age is not less than ___ years.

A. 18
B. 19
C. 21
D. 23

C. 21

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Which of the following is not a requirement for utility registration?

A. inventive step
B. industrial applicability
C. novelty
D. a technical solution to problem

A. inventive step

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A document issued by the DENR secretary indicating that the proposed project will cause significant negative environmental impact

A. Environmental Impact Statement
B. Environmental Impact Assessment
C. Environmental Compliance Certificate
D. Environmental Critical Project

C. Environmental Compliance Certificate

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

A. paper
B. cement
C. petroleum
D. detergents

A. paper

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Water is in a vapor-liquid equilibrium situation at 1.2 atm in a piston cylinder assembly. You inject 5 cm3 of air into the system but keeping the pressure and temperature constant. What happens?

A. all the water vaporizes
B. some water vaporizes
C. all the water condenses
D. some water condenses

D. some water condenses

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A tube is specified by its

A. thickness only
B. thickness and outer diameter both
C. outer diameter
D. inner diameter

B. thickness and outer diameter both

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Identification of pipelines carrying different liquids and gases is done by

A. diameter of the pipe
B. color of the pipe
C. the altitude of at which pipe is located
D. none of these

B. color of the pipe

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Surge tanks are provided in large diameter gas carrying pipelines to

A. store a definite quantity of water all the time
B. reduce water hammer
C. facilities easy dismantling of pipeline for cleaning and maintenance
D. none of these

B. reduce water hammer

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Disc compensators are provided in large diameter gas carrying pipelines to

A. keep the pipe in proper orientation
B. make the pipe leak-proof
C. account for contraction/expansion of pipe due to temperature changes of the surrounding
D. account for pressure variation inside the pipelines

C. account for contraction/expansion of pipe due to temperature changes of the surrounding

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This is the actual temperature of a vapor-gas mixture as ordinarily determined by immersion of a thermometer in the mixture.

A. wet-bulb temperature
B. saturation temperature
C. dew point temperature
D. dry-bulb temperature

D. dry-bulb temperature

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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 gas mixture is

A. saturated
B. unsaturated
C. supersaturated
D. none of these

B. unsaturated

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H3PO3 is

A. a tribasic acid
B. a dibasic acid
C. neutral
D. a monobasic acid

B. a dibasic acid

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Brass is an alloy of copper and ____.

A. tin
B. zinc
C. aluminum
D. silver

B. zinc

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If CA is plotted versus time and a straight line is observed, the reaction is said to be ____.

A. 1st order
B. 2nd order
C. zero order
D. fractional order

C. zero order

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The hydrogen carrier in metabolic reaction is ____.

A. ADP
B. ATP
C. NAD
D. UDP

C. NAD

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Which of the following define Koettstorfer number?

A. it is used to determine the number of theoretical stages in distillation
B. it is the mg of KOH needed to saponify a gram of oil
C. it is the ratio of momentum force to viscous force
D. it is the ratio of viscous force to pressure force

B. it is the mg of KOH needed to saponify a gram of oil

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The adsorbent used in the purification of hydrocarbon products is _____. A. alumina B. bone char C. fuller's earth D. silica gel

D. silica gel

Proximate analysis is ASTM procedure no. A. D3172 B. D3176 C. D0409 D. D1589

A. D3172

Which of the following structures is a ketohexose? A. altrose B. idose C. fructose D. talose

C. fructose

It is a simply fixed medium biological reactor with the waste water being spread over the surface of a solid medium where the microbes are growing. A. lagoons B. grit chambers C. neutralization tank D. trickling filters

D. trickling filters

In hindered settling, particles are A. placed farther from wall B. not affected by other particles C. near each other D. none of these

C. near each other

In continuous fluidization A. solids are completely entrained B. the pressure drop less than that for batch fluidization C. there is no entrainment of solids D. velocity of the fluid is very small

A. solids are completely entrained

Pressure drop in fluidized bed reactor is A. less than that in a similar packed bed reactor B. same as that in a similar packed bed reactor C. more than that in a similar packed bed reactor D. none of these

C. more than that in a similar packed bed reactor

Slugging in a fluidized bed can be avoided by A. using tall narrow vessel B. using deep bed solids C. the proper choice of particle size and by using shallow beds of solids D. using very large particles

C. the proper choice of particle size and by using shallow beds of solids

Minimum porosity for fluidization is A. that corresponding to static bed B. that corresponding to completely fluidized bed C. the porosity of the bed when true D. less than that of the static bed

C. the porosity of the bed when true

In a fluidized bed reactor A. temperature gradients are very high B. hot spot formed C. temperature is more or less uniform D. segregation of the solids occurs

C. temperature is more or less uniform

Lower BWG means A. lower thickness tube B. outer diameter of tube C. lower cross-section of tube D. inner diameter of tube

C. lower cross-section of tube

Cavitation occurs in a centrifugal pump when A. the suction pressure < vapor pressure of the liquid at that temperature B. the suction pressure > vapor pressure of the liquid at that temperature C. the suction pressure = vapor pressure D. the suction pressure = developed head

A. the suction pressure < vapor pressure of the liquid at that temperature

Cavitation can be prevented by A. suitably designing the pump B. maintaining the suction head sufficiently greater than the vapour pressure

B. maintaining the suction head sufficiently greater than the vapour pressure

Priming needed in a A. reciprocating pump B. centrifugal pump C. diaphragm pump D. gear pump

B. centrifugal pump

The maximum depth from which a centrifugal pump can draw water A. dependent on the speed N of the pump B. 34 feet C. dependent on the power of the pump D. 150 feet

B. 34 feet

Plunger pumps are used for A. higher pressure B. slurries C. viscous mass D. none of these

A. higher pressure

Molten soap mass is transported by a A. diaphragm pump B. reciprocating pump C. centrifugal pump D. gear pump

D. gear pump

To handle smaller quantity of fluid at high discharge pressure use A. reciprocating pump B. rotary vacuum pump C. centrifugal pump D. volute pump

A. reciprocating pump

Which of the following can be used to create a flow of gas where no significant compression is required? A. reciprocating compressor B. axial flow compressor C. blower D. centrifugal compressor

C. blower

Which of the following adsorbent is used to decolorize yellow glycerine? A. silica gel B. Fuller's earth C. activated carbon D. alumina

C. activated carbon

CO2 cab be adsorbed by A. hot cupric oxide B. cold Ca(OH)2 C. heated charcoal D. alumina

C. heated charcoal

Popular apparatus in extracting essences and aroma substances and antibiotics in pharmaceutical industry. A. disc separator B. robatel extractor C. grasser contractor D. reflux drum

A. disc separator

Metal plates with holes A. sieve tray B. thermo siphon C. packing support D. contactor

A. sieve tray

Acetylene is used as a starting material for the preparation of plastics, synthetic rubber and synthetic fiber called A. Narlon B. Corlon C. Orlon D. Forlon

C. Orlon

In a drying operation, the critical moisture content is at A. the middle of the falling rate period B. the end of the falling rate period C. the middle of the constant rate period D. the end of the constant rate period

D. the end of the constant rate period

What device is used to protect the pipeline from bursting due to pressure rise when the water in the pipeline is brought to rest? A. surge tank B. check valve C. sluice gate D. float

A. surge tank

There is the minimum capacity for each blower, at every speed, below which operation becomes unstable. The instability is accompanied by a characteristic noise known as A. purge B. surge C. water hammer D. draft

B. surge

Defines the classification of water resource A. DAO 34 B. DAO 14 C. DAO29 D. DAO 18

A. DAO 34

A more volatile substance will have a _____ vapor pressure A. lower B. higher C. constant D. any of these

B. higher

Formation of the smallest aggregate of molecules in a supersaturated solution capable of growing into a large precipitate particle is called _____. A. crystal growth B. nucleation C. peptization D. creeping

B. nucleation

The following may be used in the process of disinfection except A. sulfuric acid B. ozone C. chlorine D. UV ray

A. sulfuric acid

Dispersion of solid or liquid particles of microscopic size in gaseous media is ______. A. soot B. mist C. vapor D. aerosol

D. aerosol

Heat transfer in turbulent flow may be described by the following dimensionless groups except A. Nusselt B. Prandtl C. Schmidt D. Reynolds

C. Schmidt

The following is a state function except A. entropy B. enthalpy C. internal energy D. heat

D. heat

Type of evaporation operation where the temperature decreases from effect to effect. A. feedbackward B. feedforward C. parallel feed D. all of these

D. all of these

Which of the following is the reason why one gram of steam at 100°C causes more serious burn than 1 gram of water at 100°C? A. steam is less dense than boiling water B. steam is everywhere thus it strikes greater force C. the steam has the highest specific heat D. steam contains more internal energy

D. steam contains more internal energy

Calcite is A. potassium carbonate B. calcium carbonate C. sodium hydroxide D. calcium hydroxide

B. calcium carbonat

To prevent a bridge from being destroyed, soldiers marching on the bridge are ask to break their steps. Which of the following is responsible for such danger? A. Doppler effect B. resonance C. beats D. vibration

B. resonance

Which is not a reason that sometimes ozone is preferred over chlorine as a disinfectant for water? A. ozone is cheaper B. ozone is better for killing viruses C. chlorine imparts an unpleasant taste to water D. chlorine forms toxic by-products

A. ozone is cheaper

A farmer's cattle frequently abort spontaneously. Some baby pigs are born blue in color. His well water is found to be contaminated with A. nitrates B. phosphates C. lead D. bacteria

A. nitrates

A solids whose particles have no orderly structure. A. polycrystalline B. crystalline C. amorphous D. melt

C. amorphous

Quartz is A. LiO2 B. SiO2 C. N2O D. S2O3

B. SiO2

Which crystal structure has a unit cell with two atoms? A. body centered cubic B. hexagonal closed packed C. face centered cubic D. simple cubic

A. body centered cubic

It is the number of particles immediately surrounding a particle in the crystal particle. A. atomic packing factor B. coordination number C. crystal density D. atomic diameter

B. coordination number

When light waves pass through a narrow slit, they are scattered in such a way that the waves are seems to spread out. This physical phenomenon is A. refraction B. rarefraction C. diffraction D. reflection

C. diffraction

He coined the term "polymer" to denote molecular substances of high molecular mass formed by the polymerization (joining together) of monomers, molecules of low molecular mass. A. Arthur Little B. Antoine Lavoiser C. Jons Jakob Berzellus D. John Dalton

C. Jons Jakob Berzellus

Predictions about future organizational and environmental circumstances that will influence plans, decisions and goal attainment A. horoscope B. forecast C. programming D, synergy

B. forecast

A process can be termed spontaneous if A. delta G is positive B. delta G is negative C. delta G is zero D. delta G is zero in the beginning and positive at the end of the reaction

B. delta G is negative

Which of the following is not correct? A. G is zero for a reversible process B. H is positive for a spontaneous reaction C. G is positive for a spontaneous process D. S increases for a spontaneous reaction Note: delta yung mga box

C. G is positive for a spontaneous process

During an isothermal expansion of an ideal gas, its A. enthalpy increases B. enthalpy reduces to zero C. enthalpy remains unaffected D. internal energy decreases

C. enthalpy remains unaffected

Which of the following has the greatest mass? A. positron B. neutron C. proton D. alpha particle

D. alpha particle

Which of the following particle has the smallest mass? A. alpha particle B. proton C. neutron D. positron

D. positron

Who discovered positron? A. Anderson B. Pauli C. Heisenberg D. Bohr

A. Anderson

Sound waves does not travel in : A. air B. material medium C. vacuum D. none of these

C. vacuum

Two objects are released at the same height at the same time, and one has twice the weight of the other. Ignoring air resistance A. the heavier object hits the ground first B. whichever hits the ground first depends on the distance dropped C. the lighter object hits the ground first D. they both hit at the same time

D. they both hit at the same time

Water molecules move back and forth between the liquid and the gaseous state A. only when air is saturated B. at all times, with evaporation condensation and saturation defined by the net movement C. only when the outward movement of the vapor molecules produces a pressure equal to the atmospheric pressure D. only at the boiling point

B. at all times, with evaporation condensation and saturation defined by the net movement

A heat engine is designed to A. drive heat from a cool surface to a warmer location B. drive heat from a warm surface to a cooler location C. convert mechanical energy to heat D. convert heat to mechanical energy

D. convert heat to mechanical energy

An observer on the ground will hear a sonic boom from an airplane travelling faster than the speed of the sound A. only when the airplane breaks the sound barrier B. when the plane is directly overhead C. as the airplane is approaching D. after the plane has passed by

D. after the plane has passed by

An image that is not produced by light rays coming from the image, but is the result of your brain's interpretations of light rays is called a/an A. real image B. imagined image C. virtual image D. phony image

C. virtual image

Light travelling at some angle as it moves from water into the air is refracted away from the normal as it enters the air, so the fish you see under the water is actually (draw a sketch if needed) A. above the refracted image B. beside the refracted image C. below the refracted image D. in the same place as the refracted image

B. beside the refracted image

The ratio of the speed of light in a vacuum to the speed of light in some materials is called A. the critical angle B. the law of reflection C. total internal reflection D. the index of refraction

D. the index of refraction

Using the laws of motion for moving particles and the laws of electrical attraction, Bohr calculated that electrons could A. move only in orbits of certain allowed radii B. move, as do planets, in orbits at any distance from the nucleus C. move in orbits at any distance from the nucleus that matched the distances between colors in the spectrum D. move in orbits at variable distances from the nucleus that are directly proportional to the velocity of the electrons

A. move only in orbits of certain allowed radii

According to the Bohr model, an electron gains or loses energy only by A. moving faster or slower in an allowed orbit B. being completely removed from an atom C. jumping from one allowed orbit to another D. jumping from one atom to another atom

C. jumping from one allowed orbit to another

When an electron in a hydrogen atom jumps from an orbit farther from the nucleus to an orbit closer to the nucleus, it A. emits a single photon with an energy equal to the energy difference of the orbits B. emits four photons, one for each of the color lines observed from the spectrum of hydrogen C. emits a number of photons dependent on the number of orbit levels jumped over D. none of the above is correct

D. all of the above is correct

An alcohol with two hydroxyl groups per molecule is called A. ethanol B. glycerine C. glycerol D. glycol

D. glycol

Insulin, a hormone, is chemically a A. fat B. steroid C. protein D. carbohydrates

C. protein

Formation of soap involves A. hydrolysis B. polymerization C. esterification D. condensation

A. hydrolysis

Penicillin was first discovered by A. Fleming B. Tence and Salke C. S.A. Waksna D. Lewis

A. Fleming

A vitamin which is a steroid is A. vitamin A B. vitamin B C. vitamin C D. vitamin D

D. vitamin D

The indicator used in titrating oxalic acid with caustic soda solution is A. methyl orange B. methyl red C. phenolphthalein D. fluorescein

C. phenolphthalein

If a given gas has a compressibility factor, z<1, this means that ____ exist between the molecules of gases A. attractive forces B. repulsive forces C. no force of attraction D. none of these

A. attractive forces

Duralumin is an alloy of A. aluminum, copper and manganese B. aluminum and nickel C. aluminum, nickel and silicon D. none of these

A. aluminum, copper and manganese

Presence of cobalt in steel improve its A. cutting ability B. corrosion resistance C. tensile strength D. none of these

A. cutting ability

Caustic soda can be stored in A. steel drums B. cast iron drums C. brass drum D. gun metal drum

A. steel drums

Monel metal is an alloy of A. molybdenum and nickel B. molybdenum and aluminum C. nickel and copper D. molybdenum and zinc

C. nickel and copper

A low density material, usually domestic refuse, straw or woodchips which is mixed with compost to permit air circulation while the compost is digesting. A. catchment B. bulking agent C. foaming agent D. thermal plume

B. bulking agent

Dense, smoky fog, the formation of which is promoted by reactions between unsaturated hydrocarbons and oxides of nitrogen in the presence of sunlight and under stable meteorological conditions. A. smoke B. aerosols C. fog D. smog

D. smog

The clear, fluid portion of blood both lacking blood cells and fibrinogen. It is the fluid remaining after coagulation of plasma, the noncellular liquid fraction of blood. A. WBC B. RBC C. hemoglobin D. serum

D. serum

A basin used during water purification to chemically precipitate out fine particles, microorganism and organic material by coagulation or flocculation. A. catch basin B. settling basin C. lagoon D. neutralization tank

B. settling basin

A general term for the precipitated solid matter produced during water and sewage treatment, solid particles composed of organic matter and microorganisms that are involved in aerobic sewage treatment. A. residue B. ash C. sludge D. solid waste

C. sludge

The removal of sewage of inorganic nutrients, heavy metals, viruses etc., by chemical and biological means after microorganisms have degraded dissolved organic material. A. preliminary treatment B. secondary treatment C. primary treatment D. tertiary treatment

D. tertiary treatment

Brix scale is used for A. sugar solutions B. LPG C. petroleum D. water

A. sugar solutions

Which will dissolve fastest in water? A. lump sugar in hot coffee B. granular sugar in cold coffee C. granular sugar in hot coffee D. lump sugar in cold coffee

C. granular sugar in hot coffee

Class ____ is used for recreation such as bathing, swimming, and skin diving. A. A B. B C. C D. D

B. B

According to Bronsted-Lowry theory, an acid is a substance that can A. accept an electron pair B. accept a proton C. donate an electron pair D. donate a proton

D. donate a proton

Calcium carbonate is also known as A. lime B. soda C. chalk D. ash

C. chalk

The rate of microbial growth is temperature-dependent. Bacteria which grow over the temperature range 7-45°C are called A. thermophiles B. mesophiles C. psychrophiles D. endophiles

B. mesophiles

Bacteria which can grow at an optimum temperature range of 30 to 45°C are called A. thermophiles B. mesophiles C. psychrophiles D. endophiles

B. mesophiles

If the reaction 2A → B + C is second order, which of the following plots will give a straight line? A. CA^2 vs time B. 1/CA vs time C. log CA vs time D. CA vs time

B. 1/CA vs time

Which of the following will change the value of the equilibrium constant for the reaction between the Hg(g) and I2(g)? A. adding a catalyst B. increasing the temperature C. increasing the pressure (temperature constant) D. increasing the concentration of the reactants

A. adding a catalyst

What would happen if the electrodes were put in a saturated solution of glucose dissolved in water? A. light bulb would glow B. apparatus would combust C. light bulb would remain dark D. glucose molecules would dissociate

C. light bulb would remain dark

A lab technician may prevent a blood sample from clotting by adding compound that prevents ____ from entering the clotting process. A. potassium citrate B. vitamin K C. sodium ion D. calcium ion

D. calcium ion

The end products of glucose metabolism are A. oxygen, carbon and energy B. the starting materials for photosynthesis C. the starting materials for citric acid cycle D. hydrogen, carbon and energy

B. the starting materials for photosynthesis

What are the units of rate constant for the reaction in solution that has an overall reaction order of two? (M is molarity, s in seconds) A. 1/s B. 1/M-s C. 1/M2 s D. M/s

B. 1/M-s

Which conditions will increase the rate of a chemical reaction? A. decrease temperature and decrease concentration of reactants B. decrease temperature and increase concentration of reactants C. increase temperature and decrease concentration of reactants D. increase temperature and increase concentration of reactants

D. increase temperature and increase concentration of reactants

Retinal, retinol, retinoic acid are stable forms of A. vitamin A B. vitamin B C. vitamin C D. vitamin D

A. vitamin A

Measurement of the slats dissolved in seawater taken from various locations throughout the world shows that seawater has A. a uniform chemical composition and a variable concentration B. a variable chemical composition and a variable concentration C. a uniform chemical composition and a uniform concentration B. a variable chemical composition and a uniform concentration

A. a uniform chemical composition and a variable concentration

The percentage of dissolved salts of seawater averages about A. 35% B. 3.5% C. 0.35% D. 0.035%

B. 3.5%

The salinity of sea water is increased locally by A. the addition of water from a larger river B. heavy precipitation C. the formation of sea ice D. none of the above

C. the formation of sea ice

Considering only the available light and the ability of gases in seawater, more abundant life should be found in a A. cool, relatively shallow ocean B. warm, very deep ocean C. warm, relatively shallow Ocean D. cool, very Deep Ocean

A. cool, relatively shallow ocean

Without any heat being added or removed, a parcel of air that is expanding is becoming A. neither warmer nor cooler B. warmer C. cooler D. the temperature of the surrounding air

B. warmer

A parcel of air shoved upward into the atmospheric air in a state on instability will expand and become cooler, A. but not as cool as the surrounding B. and thus colder than the surrounding air C. reaching the same temperature as the surrounding air D. then warmer than the surrounding air

A. but not as cool as the surrounding

A parcel of air shoved upward into the atmospheric air in a state on stability will expand and become cooler, A. but not as cool as the surrounding B. and thus colder than the surrounding air C. reaching the same temperature as the surrounding air D. then warmer than the surrounding air

B. and thus colder than the surrounding air

Your ear makes a "pop" sound as you descend in an elevator because A. air is moving from the atmosphere into your eardrum B. air is moving from your eardrum into the atmosphere C. air is moving into or out of your eardrum D. of none of the above

A. air is moving from the atmosphere into your eardrum

Of the following elements, the one with the greatest electron holding ability is A. sodium B. zinc C. iron D. mercury

D. mercury

Of the following elements, the one with the greatest chemical reactivity is A. aluminum B. zinc C. iron D. mercury

A. aluminum

The mass of any isotope is based on the mass of A. hydrogen, which is assigned the number 1 since it is the lightest element B. oxygen, which is assigned a mass 16 C. an isotope of carbon, which is assigned a mass of 12 D. its most abundant isotope as found in nature

C. an isotope of carbon, which is assigned a mass of 12

. The lines of color in a line spectrum for a given element A. change in color with changes in temperature B. are always the same, with regular spacing pattern C. are randomly spaced, with no particular pattern D. have the same colors, with a spacing pattern that varies with temperature

B. are always the same, with regular spacing pattern

The sky appears to be blue when the sun is high in the sky because A. blue is the color of air, water and other fluids in large amounts B. red light is more scattered than blue C. blue light more than the other colors D. none of the above

C. blue light more than the other colors

The photoelectric effect proved to be a problem for a wave model of light because A. the number of electrons ejected varied directly with the intensity of light B. the light intensity had no effect on the energy of the ejected electrons C. the energy of the ejected electrons varied inversely with the intensity of light D. the energy of the ejected electrons varied directly with the intensity of light

B. the light intensity had no effect on the energy of the ejected electrons

Latent heat is "hidden" because it A. goes into or comes out of internal potential energy B. is a fluid (caloric) that cannot be sensed C. does not actually exist D. is form of internal kinetic energy

A. goes into or comes out of internal potential energy

As a solid undergoes a phase change to a liquid state , it A. releases heat while remaining at a constant temperature B. absorbs heat while remaining at a constant temperature C. releases heat as the temperature decreases D. absorbs heat as the temperature decreases

B. absorbs heat while remaining at a constant temperature

The condensation of water vapor actually A. warms the surrounding B. cools the surrounding

A. warms the surrounding

In calculating the upward force required to lift an object, it is necessary to use g if the mass is given in kg. the quantity of g is not needed if the weight is given in lb because A. the rules of measurement is different in the English system B. the symbol for the metric mass has the letter g in it, and the symbol for pound does not C. a pound is defined as the measure of force and a kilogram is not D. a kilogram is a unit of weight

C. a pound is defined as the measure of force and a kilogram is not

The potential energy of a box on a shelf, relative to the floor, is a measure of A. the work that was required to put the box on the shelf from floor B. the weight of the box times the distance above the floor C. the energy of the box has because of its position above the floor D. all of the above

D. all of the above

A rock on the ground is considered to have a zero potential energy. In the bottom of the well, then, the rock would be considered to have A. zero potential energy, as before B. negative potential energy C. positive potential energy D. zero potential energy, but will require work to bring it back to the ground level

B. negative potential energy

Combustion of pulverized coal as compared to that of lump coal A. develops a non-luminous flame B. can be done with less excess air C. develops a low temperature flame D. provides a lower rate of heat release

B. can be done with less excess air

Which of the following is the most important deterrents to an extended use of pulverized coal in boiler firing? A. ash disposal problem B. excessive fly-ash discharge from the stack C. high power consumption in its transportation D. erosion of induced draft fan blades

A. ash disposal problem

The terms "sweet" and "sour" in natural gas terminology, are used to denote the absence or presence of _____. A. CO B. methane C. H2S D. glucose

C. H2S

It is the solid, cellular, infusible material remaining after the carbonization of coal, pitch, petroleum residue and certain other carbonaceous materials. A. coke B. char C. wood D. peat

A. coke

An amorphous carbon that has been treated with steam and heat until it has a very great affinity for adsorbing many materials. A. lampblack B. carbon black C. activated carbon D. graphite

C. activated carbon

It is the enrichment of water with nutrients A. putrefaction B. eutrophication C. thermal stratification D. decomposition

B. eutrophication

It is a wet, partially decomposed organic matter A. lignite B. peat C. charcoal D. asphalt

B. peat

A hormone that enables the cells to utilize glucose is A. gastrin B. insulin C. testosterone D. cortisone

B. insulin

Tobacco smoke contains A. caffeine B. nicotine C. niacine D. morphine

B. nicotine

Rod-shaped bacteria are called A. bacilli B. spirilla C. cocci D. streptococci

A. bacilli

Which one of the following is incorrect? A. the equilibrium constant is not affected by temperature changes B. equilibrium is dynamic, as some molecules are always reacting C. if an equilibrium constant is large, relatively large numbers of products are formed

A. the equilibrium constant is not affected by temperature changes

Nitrogen oxides from automobile exhausts are chiefly associated with a pollution problem called A. acid rain B. greenhouse effect C. smog D. annoying

C. smog

Who showed that electrons can be considered to have both particle character and wave character? A. Thompson B. Moseley C. Heisenberg D. de Broglie

D. de Broglie

Which isotope are particularly useful for both diagnostic and therapeutic work with the thyroid gland? A. cobalt-60 B. technetium-99 C. iodine-131 D. tritium

C. iodine-131

Another instrument besides a Geiger counter that is useful in detecting radiations is the A. dosimeter B. anomometer C. calorimeter D. chomatograph

A. dosimeter

. A radioactive isotope that is now widely used in cancer treatment is A. cobalt-60 B. tritium C. deuterium D. sodium-24

A. cobalt-60

A radioactive isotope useful in establishing the age of ancient objects is A. nitrogen-14 B. lead-20 C. potassium-39 D. carbon-14

D. carbon-14

The smallest known cells are A. protozoa B. algae C. fungi D. bacteria

D. bacteria

Which of the following plastics is use in making Styrofoam, disposable cups, forks, spoons and food containers? A. polyethylene B. polyvinyl chloride C. polypropylene D. polystyrene

D. polystyrene

The color of bromine is A. white B. violet C. black D. brown reddish

D. brown reddish

Which of the following generates the most ions in dilute aqueous solution? A. C2H5OH B. MgCl2 C. NaCl D. NaHSO4

B. MgCl2

Metal oxide + water →? A. carbon dioxide B. acid C. salt D. metal

D. metal

Metal oxide + acid →? A. salt B. base C. salt + water D. base + water

C. salt + water

The molecular geometry of NO2 is A. bent B. linear C. trigonal planar D. octahedral

A. bent

This is the early period of growth where the organisms adjust to its new environment. A. stationary phase B. logarithmic phase C. lag phase D. decline phase

C. lag phase

A first order reaction requires two unequal sized CSTR. Which of the following gives a higher yield? A. large reactor followed by smaller one B. small reactor followed by larger one C. either of the arrangement (a) or (b) will give the same yield D. data insufficient; can't be predicted

C. either of the arrangement (a) or (b) will give the same yield

A rotary vacuum filter with negligible filter medium resistance delivers 125 ft 3 of filtrate per minute when a given CaCO3-H2O mixture is filtered under known conditions. If the pressure drop over the cake is doubled, all other conditions remaining constant, the volume of the filtrate delivered per hour is A. 10,000 ft3 B. 177 ft3 C. 11000 ft3 D. 7500 ft3

C. 11000 ft3

A metallic rod 2 cm in diameter is used as a heating element. The thermal conductivity is 370 J/sec-m-C. The surface temperature is maintained at 200°C. for the center of the rod not to exceed 500°C, the maximum volumetric heat generation rate within the metallic rod inJ/sec-m^3 must be A. 4,440,000,000 B. 5,130,000,000 C. 6,930,000,000 D. 2,040,000,000

A. 4,440,000,000

Calculate the rate of diffusion of NaCl (in kmol/m2-s) across a film water (non-diffusing) solution 1.5 mm thick at 18°C when the concentrations on opposite sides of the film are 24 and 4 wt% NaCl respectively. The diffusivity of NaCl is 1.3 E-5 cm2/s at 18°C. Densities of 24 and 4 wt% NaCl at 18°C are 1181 and 1027 kg/m3 . A. 2.453 E-5 B. 3.657 E-6 C. 8.655 E-4 D. 4.32E-3

B. 3.657 E-6

An iron rocket fragment initially at -100°C enters the atmosphere almost horizontally and quickly fuses completely. Assuming no heat loses by the fragment, calculate the minimum velocity it must have had when it entered. Given the following: Sp. Heat of iron=0.11 kcal/kg-K, heat of fusion=30 kcal/kg, melting point=1535°C. A. 1.25 km/s B. 1.32 km/s C. 1.48 km/s D.1.67 km/s

B. 1.32 km/s

A mixture of methyl alcohol and nitrogen at a total pressure of 189 kPa contains 25 vol% methyl alcohol. If the vapor pressure of methyl alcohol can be expressed by two-constant equation: log P = 7.846 – 1978.4/T where P is in kPa and T is n degrees K, the dew point of the mixture (°C) is very nearly ____. A. 320 B. 117 C. 47 D. 50

C. 47

Two kg of air is heated at constant pressure of 200 kPa to 500°C. Calculate the entropy change if the initial volume is 0.8 m3 . A. 2.89 kJ/K B. 2.57 kJ/K C. 2.26 kJ/K D. 2.04 kJ/K

D. 2.04 kJ/K

A benzene-toluene feed (with 40 mol% benzene and 60 mol% toluene) to a distillation column is at a temperature of 20°C. The molar heat capacity of the feed is 159.2kJ/mol-K. molar heats of the vaporization of benzene and toluene are 30,813 and 33,325 kJ/kmol, respectively. The bubble point of the mixture is 95°C. the slope of the feed line is closest to A. 0 B. 1 C. 3.7 D. -3.7

C. 3.7

Pyrite containing 78% FeS2 and 22% gangue is burned with excess air to produce a stack gas with the following analysis: 7.29% SO2, 8.9% O2, 82.44% N2, and 1.35% SO3. If the cinder was found to have a partial analysis of 62.10% Fe2O3, the % FeS2 lost in pyrite is A. 6.53 B. 3.52 C. 23.10 D. 7.86

B. 3.52

Pyrite with analysis of 85% FeS2 and 15% gangue is burned with 30% excess air (FeS2 → SO3) 80% of the FeS2 burned was converted to SO2 and the rest to SO3, whole 5% of the FeS2 charged was lost in the cinder. Cinder analysis shows 2.71% SO3. The total weight of the cinder is A. 75 kg B. 85 kg C. 90 kg D. 77 kg

A. 75 kg

The cost of a 250 m2 exchanger is $500000. What is the estimated order-of-magnitude cost of a similar 900 m2 exchanger? Use 0.6 exponent for the cost. A. $1106312 B. $1289200 C. $1355890 D. $1544800 From the data in problem #10, what will be the installed cost of the 900 m2 exchanger? Use 3.3 as the Lang factor for installation. A. $3650830 B. $3210550 C. $2987550 D. $2788955

A. $1106312 A. $3650830

If you want to withdraw $150 at the end of every even year (i.e., years 2, 4…), how much should you deposit at the end of every odd year (i.e., years 1, 3…)? Assume that the interest rate is 20% compounded annually. A. $150 B. $137.5 C. $125 D. $100

C. $125

A plate and frame filter press is used to filter a certain sludge for 2 hr at constant pressure. Washing is done by using 10% of the filtrate volume collected. The time of washing is A. 100 min B. 96 min C. 1.6 min D. 100 hr

B. 96 min

0.4 kg/s of dry seashore sand, containing 1 wt% of salt, is to be washed with 0.4 kg/s of fresh water running countercurrent to the sand through two classifiers in series. Assume that perfect mixing of the sand and water occurs in each classifier and that the sand discharged from each classifier contains one part of water for every two sand (by weight). If the washed sand is dried in a kiln drier, what percent ofsalt it retain? A. 0.492 B. 0.429 C. 0.294 D. 0.249

D. 0.249

Find the volume flow rate in L/s if the power developed under a head of 320 m is 10,500 kW and the hydraulic efficiency is 85%. A. 3953 B. 3293 C. 3271 D. 3935

D. 3935

A centrifugal pump with an efficiency of 65% is driven by an electric motor with an efficiency of 90%. The pump delivers 250 kg of water per minute against a total head of 25 m. how much power (in kW) is required by the motor? A. 1.57 B. 1.74 C. 15.7 D. 11.4

B. 1.74

A plate and frame press delivers 50 liters of filtrate in an hour at a constant pressure of 50 psig. The washing time using 50 L of wash water is A. 1.6 hrs B. 3.2 hrs C. 4 hrs D. 2.5 hrs

C. 4 hrs

At 500K the rate of bimolecular reaction is 10 times the rate at 400K. Find E in cal, the activation energy for this reaction from Arrhenius law. A. 8150 B. 9150 C. 9550 D.10150

B. 9150

A type of colloid in which a gas is dispersed in a liquid example, whipped cream. A. aerosol B. foam C. emulsion D. sol

B. foam

It refers to adherence to a surface. A. adsorption B. absorption C. desorption D. osmosis

A. adsorption

103-110 Flashcards

(185 cards)