Midterm Exam

48問 • 1年前

問題一覧

piping includes pipe, flanges, fittings, bolting, gaskets, and the pressure containing portions of other piping components. It also called_______?

Valves

A galvanize iron pipe of schedule 40 , means that_____________.

It is coated with zinc

Which of the following is true about the schedule of pipe?

the higher is the pipe schedule the thicker is the pipe

The piping rating must be governed by the pressure temperature rating of the weakest pressure containing item in the piping, example is the _______________?

Fitting made of weaker material

The piping system within the jurisdiction of the National Fire Protection Assos(NFPA) requirements are required to be designed and tested to certain required pressures which are usually rated for?

175 psi and 200 psi

It is known as the measure of internal resistance?

Absolute viscosity

Adhesive joint forms a continuous bond between the mating surfaces without dissolving either one of them. It is made in by the use of an adhesive substance.

plastic piping

Air-Hardened Steel is a steel that hardens during cooling in air from a temperature above its________________?

transformation range

Steel is considered to be alloy steel when the maximum of the range given for the content of alloying elements exceeds one or more of the following limits: 0.60% for Silicon, and 0.60% for Copper & what percentage of Manganese?

1.65 %

Which of the following is the purpose of annealing?

-Reduce hardness -Improving machinability and producing the desired microstructure -Facilitating cold working -All of these mentioned

What component permits universal rotation movement in piping system?

Ball joint

In eold bending, the pipe is bent up to___________?

A radius 5 times its nominal diameter

Bending of steel piping is considered a cold-working operation at what temperature?

1300 °F

At sufficiently high temperatures, all metals flow under stress. The higher the temperature and stress, _______________?

greater the tendency to plastic flow for any given metal

A cast ferrous material in which the free graphite is in a spheroidal form.

Ductile iron

What is the primary method used to form nozzle outlets in extruded nozzles?

Heating the pipe to 2000°F to 1600°F followed by pulling conically shaped dies through a circular hole from the inside of the pipe

Which of the following best describes the process of producing extruded pipe?

Piercing a forging with a punch and then forcing it between a cylindrical die and a punch to form the pipe

What technique can be utilized in extruded pipe production to produce a wrought structure?

Autofrettage and heat treatment above the recrystallization temperature of the material

Fluid flow in a pipe is turbulent when the Reynolds number is:

Exceeds 4000

Steel is considered to be alloy steel when the maximum of the range given for the content of alloying elements exceeds one or more of the following limits: 1.65% for Manganese, ________ for Silicon, and 0.60% for Copper.

0.60%

Facilitates the removal of oxides

Flux

Flue gas recireulation for NOx control includes gas recirculation into the furnace or into the burner where_________ of the flue gas (at 350-400°C) is re-circulated and mixed with the combustion air.

20%~30%

Bunker C Fuel Oil has a sulfur content of 3% whilst marine diescl has a sulfur content of what?

0.3%

Biomass fuel include

-Bagasse & crop waste -Landfill gases & agriculture byproducts -Wood resides & energy crops All mentioned choices

High stack temperatures may be caused by the following EXCEPT________?

the fuel use is of high calorific value

What is the typical values of net stack temperature?

180 °C to 260 °C

All are causes of smoky combustion EXCEPT what?

Turbulence in combustion area

When the content of Oxygen of the flue gas is more than 12%,__________.

Heat is lost in the chimney & inefficient

Which one is a type of fabric filters?

-Shaker type bag filters -Reverse air bag filters -Pulse jet bag filters All of the mentioned choices

Cartridge filters utilizing synthetic non-woven media, such as needle-punched felts fabricated of polyester or Nomex, can withstand up to what temperatures?

200 °C

Which is TRUE about Static bag filter system?

It is suitable for small application : with relatively low inlet dust burdens

what is the ideal air flow for static bag filter?

less than 5 m3/sec

Electrostatic precipatators uses_________ to remove pollutants?

Electrical force

What is the main issue in the cyclone system?

Clogging of sticky dust

Scrubbing liquid and wetted particulate natter also drain from the bottom of the tower in what fom?

Slurry

It removes mist after packing and scrubbing liquid supply?

Demister

Gas streams with high humidity requires_____?

the nag filter unit to be insulated or heated to maintain temperature above dew point

Biofiltration uses?

microorganisms

In a venturi scrubber, what section is built into the duct that forces the gas stream to accelerate as the duct narrows and then expands?

throat

A major factor in the performance of the ESP is the__________ of the particles.

resistivity

What is the recommended pressure drop of biofilters?

100 mm water wage

It is the removal of a contaminant from the gas stream by contacting the gas with a liquid phase, where the contaminant either reacts with the liquid or dissolves in the liquid and is removed

absoption

The process of concentrating a substance on the surface of porous solids is known as_______?

adsorption

Wire plate ESP can operate up to what temperature?

700 °C

For an entrance velocity of 2m/sec, dust volume of 5 m3/sec, what is the efficiency rate f this new ESP?

99%

The philippine clean air act of 1999 is better know. as ?

RA 8749

The sugar cane residue from sugar making process is called_______?

bagasse

A method of utilizing bioenergy.

gasification

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Tapang, Rafael A. · 77問 · 1年前