Day 2 [QRC] Flashcards by Aira Manalo

At what condition in motion of 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.

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A centrifuge has a PHOSPHOR BRONZE BASKET, 380 mm in diameter, is to be run at 67 Hz with a 75 mm layer of liquid density 1200 kg/m^3 in the basket. The density of phosphor bronze is 8900 kg/m^3 and the maximum safe stress for phosphor bronze is 87.6 MN/m^2. What thickness of walls is required in the basket?

A. 8.76 mm
B. 15.1 mm
C. 17.2 mm
D. 23.5 mm

15.1 mm

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A CYCLONE SEPARATOR, 0.3 m in diameter and 1.2 m long, has a circular inlet 75 mm in diameter and an outlet size of the same size. The gas enters at a velocity of 1.5 m/s. The viscosity of air is 0.018 mN-s/m^2, the density of air is 1.3 kg/m^3 and the density of the particles is 2700 kg/m^3. At what particle size will the theoretical cut occur (um)?

A. 1.20
B. 1.68
C. 2.17
D. 2.56

2.17

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An aqueous solution consisting of particles of density 2500 kg/m^3 in the size range 1-10 um is introduced into a centrifuge with a basket 450 mm diameter rotating at 80 Hz. If the suspension forms a layer 75 mm thick in the basket, determine the time it takes for the smallest particle to settle out.

A. 19.3
B. 20.8
C. 13.7
D. 26.9

19.3

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Which of the following is TRUE?
A. The transmissivity of an opaque solid is unity.
B. Blackbodies exist in the real world.
C. The absorptivity and emissivity of a blackbody are both unity.
D. A gray body is the standard to which all other radiators are referred.

The absorptivity and emissivity of a blackbody are both unity.

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At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe?

A. 0.5
B. < 0.5
C. > 0.6
D. < 0.1

> 0.6

High Pr = convection is dominant
Low Pr = conduction is dominant

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__________ heat exchanger is used for chilling oil to be dewaxed.

A. U-tube
B. Double pipe
C. Fixed Tube
D. Floating Head

Double pipe

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Controlling heat transfer film coefficient is the one, which offers ______ resistance to heat transfer.

A. no
B. the least
C. the largest
D. lower

the largest

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If the tube number of a shell and tube heat exchanger is doubled, what will be the effect on Q/ΔTlm?

A. Q/ΔTlm will be doubled.
B. Q/ΔTlm will be multiplied by √ 2.
C. Q/ΔTlm will be halved.
D. Q/ΔTlm will be multiplied by 4.

Q/ΔTlm will be doubled.

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Removable connection of tubes to tube sheet is called

A. Ferrule
B. Socket
C. Nipple
D. Saddle

Ferrule

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A supporting base for pipes.

A. Ferrule
B. Socket
C. Nipple
D. Saddle

Saddle

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Type of connector for pipe; threaded

A. Ferrule
B. Socket
C. Nipple
D. Saddle

Nipple

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Pipes are inserted into the ________ to be welded.

A. Ferrule
B. Socket
C. Nipple
D. Saddle

Socket

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The maximum heat transfer coefficient from steam heating will be attained when the steam is _______.

A. Supersaturated
B. Saturated
C. Wet
D. None of these

Saturated

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For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side because it ______________.

A. decreases the pressure drop
B. decreases the outlet temperature of cooling medium
C. increases the overall heat transfer coefficient
D. None of these

increases the overall heat transfer coefficient

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A flat slab of rubber 0.5 in thick initially at 80F is to be placed between two electrically heated steel plates maintained at 287F. How long from the start of the heating, is required for the temperature to reach 270F, 0.1 in from the center line?

A. 0.164 h
B. 0.153 h
C. 0.573 h
D. 0.592 h

0.573 h

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The joint type with the lowest joint efficiency factor.

A. Resistance Weld
B. Lap-welded
C. Single-welded
D. Double-welded

Double-welded

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It is the recommended cost index for cost estimation of petroleum plants.

A. Marshal and Stevens Equipment Index
B. Chemical Engineering Plant Cost Inde
C. Nelson Refinery Construction Cost Index
D. Engineering News Record Construction Index

Nelson Refinery Construction Index (Nelson-Farrar Index)

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The cost of handling of materials in considered under the ___________.

A. working capital
B. direct costs
C. fixed capital
D. indirect costs

working capital

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A certain pressure vessel manufacturer avoids doing reinforcement calculations for openings by always providing a reinforcing pad extending up to double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design ______________.

A. Only if the opening is on a spherical vessel
B. Only if the opening is on a vertical cylindrical vessel
C. Only if the opening is on a horizontal cylindrical vessel
D. Irrespective of the shape of the vessel

Irrespective of the shape of the vessel

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This impeller design is characterized by having 50%to 80% of the inside diameter of the vessel as its total length, and is most suited for preventing deposits on a heat-transfer surface rather than mining.

A. Rushton
B. Paddle
C. Propeller
D. Turbine

Paddle

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Bracket supports are the most suitable for supporting ____________.

A. Thick-walled vertical vessels
B. Horizontal vessels
C. Thin spherical vessels
D. None of the above

Thick walled vertical vessels

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The conical bottom heads of chemical process equipment usually have an apex angle of ____________.

A. 30 degrees
B. 45 degrees
C. 60 degrees
D. 75 degrees

60 degrees

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Determine whether TRUE or FALSE.

I. For all adiabatic processes, the entropy change of the system must be zero.
II. For a one-component system, it is possible for two phases in equilibrium to have different chemical potentials.
III. The change in Gibbs free energy can be negative for a cyclic process.
IV. A condition for equilibrium is that (ΔA)T,F = 0

A. T, T, T, T
B. F, T, F, T
C. T, F, T, F
D. F, F, F, F

F, F, F, F

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Using the Van der Waals gas equation, derive the equation for (SH/AP)T for Van der Waals gas and estimate (SH/AP)T for CO2(g) in J/bar/mol/mol and b = 0.042 mol. A. b-2a/RT; -25 B. 2b - a/RT; +60 C. a + b/RT; -15 D. a + 2b/RT; +30

b-2a/RT; -25

Which of the following is/are true about the critical point? A. The surface tension vanishes. B. Liquid and vapor have the same density. C. There is no distinction between liquid and vapor phases. D. All of the above

All of the above

It is the most common isotherm used for multilayer adsorption on a homogenous flat surface. A. Langmuir B. Freundlich C. BET D. Toth

BET

Flash distillation is suitable for the separation of components A. Having ver close boiling points B. Which form maximum boiling azeotrope C. Having very wide boiling points D. Which form minimum boiling azeotrope

Having very wide boiling points

When drying banana chips under the sun, the rate of drying is faster A. on a slightly breezy day B. on a calm day C. on a cloudy day D. on a hot and windy day

on a hot and windy day

Most important factor to be considered in the selection of packings for absorbers is the _________ of the packing. A. Size B. Durability C. Porosity D. Cost

Porosity

Suppose there is an increase in the coefficient of mass transfer and in the surface area, what will be the value of the height of the unit? A. Small B. Infinite C. Zero D. Large

Small

With an increase in liquid flow rate at a fixed gas velocity in a randomly packed countercurrent gas absorption column, the gas pressure drop _________. A. decreases B. remains unchanged C. increases D. decreases exponentially

increases

In case of constant underflow extraction operation, the __________ at all solute concentration. A. Solids are drained to the same extent B. Ratio of the insoluble solution is constant C. Both A & B D. Neither A nor B

Both A & B Solids are drained to the same extent and Ratio of the insoluble solution is constant

The solvent used in liquid extraction should not have high latent heat of vaporization, because A. The pressure drop and hence the pumping cost will be very high B. It cannot be recovered by distillation C. Its recovery cost by distillation may be prohibitively high D. It will decompose while recovering by distillation

Its recovery cost by distillation may be prohibitively high

The following compounds are brought to flotation concentrate when calcium cyanide is added except A. galena B. copper sulfide C. sphalerite D. pyrite

pyrite

What type of particles comprise the gangue? A. Dense B. Hydrophobic C. Hydrophilic D. Porous

Hydrophilic

Which flotation cell purifies the rougher overflow? A. Conditioner B. Rougher C. Cleaner D. Scavenger

Cleaner

Frother is added in the froth flotation cell used in ore concentration to stabilize the air bubbles which will hold the ore particles but does not affect the flotability of minerals. Which of the following is not used as a frother? A. Cresylic acid B. Xanthates C. Pine Oil D. All of these

Xanthates - collector

The best unit operation in the benefaction treatment of sulfide ores is A. Classification B. Tabling C. Jiggling D. Froth Flotation

Froth Flotation

Role of a "collector" in froth flotation is to A. Form a water-repelling film on the mineral surface B. Create and stabilize froth C. Act as a surface D. Collect the minerals according to their specific gravity

Form a water-repelling film on the mineral surface

Ore concentration by froth flotation utilizes the ____________ of ore particles A. Density difference B. Wetting Characteristics C. Terminal velocities D. None of these

Wetting characteristics

Activators are those chemicals which help buoying up one mineral in preference to the other in the froth flotation process. Which of the following is an activator? A. Cresylic acid B. Copper sulphate C. Calcium carbonate D. Sodium carbonate

Copper sulphate

It is the ability of the material to resist breakage. A. Hardness B. Ductility C. Strength D. Elasticity

Strength

What is the type of stress induced in a metal rod (with constant cross-sectional area) when temperature increases and the opposing rigid body (e.g., wall) exerts an opposite reaction? A. Metal stress B. Compressive Stress C. Principal stress D. Tensile stress

Compressive stress

The energy stored in a body when strained within the elastic limit is known as

Strain energy

Electrostatic separation of minerals from each other is based on their differences in which property?

electrical conductivity

For gases flowing through a capillary, the permeability varies with respect to its viscosity and temperature. According to Pouiseuille's law, the permeability is proportional to ____ while according to Knudsen law, the permeability is ____ to temperature. A. √µ, either directly or inversely proportional B. µ^2, independent C. µ, inversely proportional D. 1/µ, directly proportional

1/µ, directly proportional

Which of the following is best applied in purification of brackish water? A. Reverse osmosis B. Sand filtration C. Lime soda process D. Permutit process

Reverse osmosis

Which of the following is a method that can be used to produce animal feed supplements or food additive from whey produced in cheese making? A. microfiltration B. diafiltration C. reverse osmosis D. ultrafiltration

ultrafiltration

O2 gas is faster than N2 gas by a factor of ____ because O2 is much more soluble in many polymers.

Pick out the correct statement. A. Dialysis is used in the production of freshwater from brine. B. Electrodialysis is used in the manufacture of NaOH. C. Electrodialysis is used for the refining/purification of petrol. D. Both B and C.

Electrodialysis is used in the manufacture of NaOH.

Which of the following is the most suitable for removing fine particles (<1 micron) from air below its due point? A. Venturi scrubber B. Electrostatic separator C. Cyclone Separator D. Fabric Filter

Electrostatic separator

The most efficient equipment for the removal of submicronic dust particles from blast furnace gas is the A. venturi atomizer B. gravity settling chamber C. electrostatic separator D. cyclone separator

electrostatic separator

The feed condition is usually dilute thus the viscosity is ____, and the convective heat transfer coefficient is ______. A. high, high B. high, low C. low, low D. low, high

low, high

It occurs when solutions deposit solid materials on heating surfaces as result of decomposition or decrease in solubility causing reduction in overall heat transfer coefficient.

Scaling

Induced draft fans provided in large thermal power plant boilers have A. forward curved blades B. backward curved blades C. double curved blades D. radial or straight blades

backward curved blaeds

It results from mixing warm, highly saturated tower discharge air with cooler ambient air that lacks the capacity to absorb all the moisture as vapor.

Fogging

It is the process where both mass and heat are transferred from gas to liquid.

Dehumidification

High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27C with relative humidity ranging from _______ percent.

45-50

Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the ______ of a fiber.

Electrical resistance

When the temperature and humidity of air is low, we usually use _______ draft cooling tower.

Natural

During dehumidification of unsaturated air wet bulb temperature and partial pressure of vapor are not constant. However, during the evaporative cooling process with recirculated water supply, the _____ remains constant.

wet bulb temperature

Unsaturated air (with dry bulb temperature and dew point being 35C and 18C, respectively) is passed through a water spray chamber maintained at 15C. The air will be cooled A. and humidified B. and dehumidifier with increase in wet bulb temperature C. at the same relative humidity D. and dehumidified with decrease in wet bulb temperature

and dehumidified with decrease in wet bulb temperature

What type of filter is operated INSIDE A HORIZONTAL TANK filled with several units that can filter at relatively high pressures?

Leaf Filter

What type of filter is tightly combined into a SERIES OF MODULES to form an assembly?

Plate and Frame

Simplest type of filter mainly used when there is relatively small amounts of solids to be removed from large amounts of water.

Bed Filters

What is the common material construction for plate and frame filter press?

Cast Iron

What is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid?

Rotary vacuum filter (e.g., Rotary disc filter)

Most rotary vacuum filters are operated at about ____% of its surface area submerged in the slurry.

Frame thickness in the plate and frame filter press is normally in the range of _____ inches?

0.25 to 8.0

During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration

at the end of filtration

It is a region in gas-fluidized systems characterized by a high proportion of the gas passing through the bed as gas pockets which cause rapid mixing in the dense particulate phase.

Bubbling

When larger particles (e.g. grans) are subjected to fluidization, the corresponding bed produced is termed as ____.

Spouted bed

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

shallow bed of solids and proper choice of particle size *A and B promotes

Fluidization has certain applications in the industry. For high conversion in a highly exothermic solid catalyzed reaction, it is best to use a A. fixed bed reactor B. fluidized bed reactor followed by a fixed bed reactor C. fixed bed reactor followed by a fluidized bed reactor fluidized bed reactor

fluidized bed reactor followed by a fixed bed reactor

Sand is dried in foundries in a _______ drier.

fluidized bed

States that all crystals that are geometrically similar and of the same material n the same solution grow at the same rate.

ΔL Law

It is the equation relating the solubility of a substance to its particle size.

Kelvin

Classification of metal forming processes into hot and cold working is based on which parameter?

Recrystallisation temperature

'ADDUCTS' and 'CLATHRATES'

Crystallization

It is also called screen opening.

Aperture

Number of apertures per linear inch

Mesh (Wire to wire center basis din)

Actual openings over the total screen area

Open Area

It is best suited for the production of fine powders with a narrow size distribution.

Jet Milling

What is the primary objective of Total Quality Management (TQM)? A. To reduce production costs B. To improve customer satisfaction C. To increase worker morale D. To increase market share

To improve customer satisfaction

What is the purpose of a Project Management Information System (PMIS)? A. To manage budget and resources B. To track project progress C. To communicate project information to stakeholders D. All of the above

All of the above

What is the primary purpose of a budget in management control? A. To evaluate past performance B. To plan and control future activities C. To motivate employees D. To establish organizational goals

To plan and control future activities

Which of the following is not a step in the project risk management process? A. Identify risk B. Determine project budget C. Assess risk D. Implement control measures

Determine project budget

What is the primary responsibility of a safety manager in an organization? A. To enforce safety regulations B. To develop and implement safety policies and procedures C. To provide safety training to employees D. All of the above

All of the above

What is the purpose of a job safety analysis? A. To evaluate the safety of a workplace B. To identify hazardous tasks and the steps to perform them safely C. To determine the root cause of accidents D. To develop safety training programs

To identify hazardous tasks and the steps to perform them safely

What is the primary purpose of a safety audit? A. To evaluate thee effectiveness of the safety program B. To determine the root cause of accidents C. To identify potential hazards in the workplace D. To develop safety training programs

To evaluate the effectiveness of the safety program

What is the main purpose of RA 9003?

To regulate the disposal of ALL types of waste

What pump is the most suitable for discharging a liquid against a pressure of at least 1500 kgf/cm^2?

Plunger (wala sa perry's)

In pipe markings, this color of pipe indicates flowing fresh water

Green

It is a measuring device that does not reach a temperature range of red hot objects 800C - 1600C.

Thermocouple

It is an undesirable characteristic of an instrument.

Time Lag

When a section of piping needs to be repaired, to have tight shutoff so that leakage is stopped, the pipe segment must have a/an ___________

Isolation valve

It is any mechanism that eliminates product defects by preventing, correcting, or drawing attention to human errors, and helps equipment or machine operators from making mistakes.

Poka-Yoke

A type of control strategy that involves using the output of one control loop as the set point for another control loop in a hierarchical arrangement

Cascade

Two or more systems operating in series whose behavior of any system is affected by any system/s subsequent tp it are said to be _______

Interacting

Which of the following processes uses the multiple-input/multiple-output (MIMO) system in controlling their process parameters? A. Evaporation B. Extraction C. Distillation D. Crushing

Distillation

Who are the pioneers of the Six Sigma Approach?

Motorola

Which of the following is not an actuator? A. Batch B. Pneumatic C. Hydraulic D. Electric

Batch

The method used in ultrasonic flow meters

Doppler

The difference between the measured value and the set point

Error

A term used to describe processes or process variables that are unstable, and create hazardous situations

Runaway

The following are examples of paramagnetic gases except A. O2 B. NO2 C. CO2 D. NO

CO2

A device used to extract a representative sample from a batch or main stream of material for analysis

Probe

A controller used for manipulating variables with only two states

On/Off

Which of the following statements is/are TRUE? I. A feedforward control system does not require an explicit process model. II. A feedback control system is not able to cope with any unaccounted disturbances. III. A feedforward control system is good for systems with large dead times IV. A feedback control system will only have a control action when the effect of the disturbance is felt

I, III, IV

A coating made of polyphenol and epichlorohydrin that offers good corrosion resistance on a wide variety of conditions.

Epoxy (Materials of Construction, Perry's)

Brass belongs to what group of materials?

Non-ferrous metals and alloys

The normal range of velocity of water in pipes is ________.

1-2 m/s

The normal range of velocity of steam in pipes is _____ m/s.

80-100

In an incompressible fluid, the density is ___________. A. Greatly affected only by moderate changes in temperature B. Greatly affected by moderate changes in pressure C. Sensible changes in both temperature and pressure D. Not affected with moderate change in temperature and pressure

Not affected with moderate change in temperature and pressure

What is the main difference between laminar flow and turbulent flow in transport phenomena?

Laminar - smooth flow; Turbulent - chaotic flow

The main factor affecting velocity of fluid in a pipe

Pressure gradient

For pipes that must be broken at intervals for maintenance, the connector used should be a/an

Union

In a general sense, gases and low molecular weight liquids are classified as ______. A. newtonian B. dilatant C. bingham D. pseudoplastics

Newtonian