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Up Stationary Grade 3 Engineering License Questions and Answers Already Passed, Exams of Engineering

how can you loose your license? ✔✔1) drinking on the job 2) sleeping on the job 3) negligence 4) unsafe work 5) signing a falsified license application for someone 6) failing to renew your license annually what must you do if you change jobs? ✔✔notify city hall if you change jobs, address or retire

Typology: Exams

2024/2025

Available from 05/13/2025

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Up Stationary Grade 3 Engineering
License Questions and Answers Already
Passed
how can you loose your license? ✔✔1) drinking on the job
2) sleeping on the job
3) negligence
4) unsafe work
5) signing a falsified license application for someone
6) failing to renew your license annually
what must you do if you change jobs? ✔✔notify city hall if you change jobs, address or retire
why should you do rounds? ✔✔Find and correct problems to prevent breakdowns. keeping
permanent records will make it easy to forecast most breakdowns because you will get to know
equipment
what is a steam boiler? ✔✔closed vessel, PARTIALLY FILLED WITH WATER, under
pressure that transforms water to steam with the application of heat.
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Download Up Stationary Grade 3 Engineering License Questions and Answers Already Passed and more Exams Engineering in PDF only on Docsity!

Up Stationary Grade 3 Engineering

License Questions and Answers Already

Passed

how can you loose your license? ✔✔1) drinking on the job

  1. sleeping on the job

  2. negligence

  3. unsafe work

  4. signing a falsified license application for someone

  5. failing to renew your license annually

what must you do if you change jobs? ✔✔notify city hall if you change jobs, address or retire

why should you do rounds? ✔✔Find and correct problems to prevent breakdowns. keeping permanent records will make it easy to forecast most breakdowns because you will get to know equipment

what is a steam boiler? ✔✔closed vessel, PARTIALLY FILLED WITH WATER, under pressure that transforms water to steam with the application of heat.

what are the requirements of a good boiler? ✔✔1) simple

  1. designed to accommodate expansion and contraction

  2. adequate steam and water space

  3. efficient

  4. responsive to demands

  5. accessible for cleaning and repairs

  6. safe

Name and describe 3 types of heat transfer used in boiler operation ✔✔1) RADIANT HEAT - transmitted from hot body to a cold body by means of direct radiation (heat from sun reaches us by radiation)

  1. CONDUCTION - physical contact (coffee cup is heated by conduction when hot coffee touches the cup)

  2. CONVECTION - carried along by a moving part such as air or water (your living room is heated by warm air from your furnace in another location

  1. some watertube

  2. cast iron set in brick

  3. Stirling boiler

  4. Heine boiler

what is a crown sheet and its purpose?


what is a tube sheet and its purpose? ✔✔in a vertical firetube boiler holds the tubes and is thicker because it is exposed to the fire.


holds the tubes and does not see the fire

what is a waterleg on a boiler? ✔✔space between the outer shell and the furnace containing boiler water. it absorbs heat that would be wasted and increases the capacity of the boiler. the surfaces are flat and must be stayed.

is an HRT Boiler set level or inclined and why?


are HRT Boiler tubes set level or inclined and why? ✔✔INCLINED 1-3" front to rear to permit drainage and removal of water impurities


INCLINED with the boiler

Name 2 way to support and take care of expansion of an HRT Boiler


Which way is best? ✔✔1) Suspended from hangars and supported by overhead beams

  1. Set on saddles equipped with rollers to permit movement of the boiler as it expands and contracts

Suspended from hangars and supported by overhead beams is best because it works no hardship on the furnace walls

what is a longitudinal joint?


what is a circumferential joint? ✔✔LONGITUDINAL JOINT = seam running the length of the shell and is butt strap construction or fusion welded. it is above the fireline to avoid overheating.


how is a Stirling Boiler suspended? ✔✔lugs on the ends of the upper drums rest on the beams of its structure. the lower (MUD) drum is suspended from the tubes and is free to move by expansion.

describe the circulation of water within the Stirling Boiler ✔✔feed water enters the top rear drum, passes down the rear tubes to the mud drum. steam and boiler water go up the front and center tubes to the front and center drums. CIRCULATING TUBES allow boiler water to pass between the drums. what does not go out as steam, goes back down the rear tubes.

what provisions are made for tube removal on water boilers? ✔✔1) some tubes are left out

  1. the tubes are staggered

  2. sometimes, every other row is omitted

What is a water tube boiler?


list 5 advantages


list 5 disadvantages


name 4 types ✔✔in a water tube boiler, products of combustion pass around tubes containing boiler water


ADVANTAGES:

  1. rapid steamers

  2. use less water

  3. less chance of explosion

  4. no flat surfaces

  5. smaller tube sizes


DISADVANTAGES:

  1. elaborate settings

  2. field assembled

  3. initial cost per pound of steam is higher

  4. greater number of openings thus more air infiltration

  5. require more floor space


TYPES:

  1. can be made portable

  2. compact


DISADVANTAGES:

  1. slow steamers

  2. limited in pressure and capacity

  3. liable to disastrous explosions because drums and joints are set over the fire

  4. inefficient

  5. inaccessible for inspection


TYPES:

  1. H.R.T.

  2. locomotive

  3. Scotch Marine

  4. Vertical fire tube

What type stays are used in wet back (Scotch Marine) type boilers? ✔✔stay bolts and through stays. these sometimes will have a telltale drilled in them

describe a sectional boiler ✔✔the sectional headers are built up of vertical sections or units. a sufficient number of sections are clamped together to form the desired boiler size. these boilers can be erected in an existing building by carrying them in piece by piece

what is a superheater?


what are the advantages of a superheater? ✔✔a super heater is a device used to raise the temperature of steam without raising its pressure.


  1. increases efficiency of the boiler

  2. delivers dryer steam

  3. dryer steam can be transmitted long distances with minimal heat loss

  4. dryer steam reduces condensation and erosion

what is a radiant type superheater?


what is a convection type superheater?


what is a water wall? ✔✔a set of tubes containing boiler water set in the refractory. they absorb heat that would otherwise be lost to the refractory and they increase the capacity of the boiler

what is A.S.M.E. and its purpose?


what code of information is stamped on the boiler?


what is an A.S.M.E. symbol stamp?


where are the code markings found on a boiler? ✔✔American Society of Mechanical Engineers has written a set of minimum standards for the safe construction of pressure vessels.


stamped on the boiler shell or a plate attached to the shell will be:

  1. model and serial numbers

  2. safe working pressure

  3. date of manufacture

  4. horsepower rating

  5. square feet of heating surface

  1. steam generation in pounds per hour

  2. fuel designed for

  3. ASME stamp


the ASME symbol stamp will identify the boiler or accessory type.


fire tube boiler - it may be located by the water column near the front right side

water tube boiler - it will be located next to the manhole on the steam drum

what is the cross section of a 1" bolt? ✔✔DxDx.7854(1/4pi)

1x1x.7854=.7854 sq.in.

show your work and label everything!

what is an alloy?


name 5 ✔✔a mixture of two or more metals.


  1. brass

what is a butt joint?


what is a butt-strap joint? ✔✔LAP JOINT = when one plate overlaps the other and is joined


BUTT JOINT = when two ends of the plate meet end to end and are joined


BUTT-STRAP JOINT = when two ends of the plate meet end to end and are joined by a plate. (one plate is a single butt strap joint / two plates are a double butt strap joint)

is the longitudinal joint the strongest part of the boiler ✔✔NO! it is the strongest type joint, but any joint is the weakest part of a boiler

two boilers are make of the same grade of steel, same thickness of plate and same type of joints. one is 30" in diameter the other is 60" diameter. which will withstand the greatest pressure and demonstrate your answer ✔✔the 30" boiler-it has less total pressure on the shell.

DxDx.7854(1/4pi)xpsi

30x30x.7854x120 psi = 84,823 lbs. total pressure

60x60x.7854x120 psi = 339,292 lbs. total pressure

show your work on everything!

what are tube ligaments? ✔✔the area between the tube holes on the tube sheet

what type stays are used in the heads of water tube boilers?


why? ✔✔there are no stays


the head of the boiler drum is shaped with a die, which dishes and forms them in to the shape they would take as a result of the pressure to which they will be subjected

why is a row of tubes sometimes left out of an HRT boiler? ✔✔to improve circulation reducing carryover

in a firetube boiler how are the tubes secured in a tube sheet and why?


in a watertube boiler how are the tubes secured in a tube sheet and why?

why are hollow through bolts used on water legs? ✔✔a through stay is a rod threaded on both ends, held in place with nuts on the inside tightened against nuts on the outside of the plates. it runs from one tube sheet or flat surface to the other.


a small hole is drilled into the stay bolt so if it failed a leak will develop and be detected at once

describe a diagonal stay


describe a gusset stay


where would each be used? ✔✔DIAGONAL STAY = made of flat materials similar to the boiler shell and is attached directly to the boiler shell and head or tube sheet


GUSSET STAY = made of boilerplate riveted to the shell and head or tube sheet by means of angle iron. MORE RIGID


both are used to brace right angle surfaces

why are hand-holes and man-holes made oval instead of round?


what are the minimum sizes for man-hole and hand-hole openings? ✔✔so they can be inserted into and removed from their respective openings in the boiler


man-hole = 10x16 or 11x

hand-hole = 2-3/4 x 3-1/

what is thermal efficiency?


what is considered a good percentage? ✔✔the ratio of heat absorbed by the water (TO) the heat provided by the fuel


a good percentage is 85%, some boilers made today can reach 95%

how do you determine boiler capacity?


what is boiler heating surface? ✔✔BOILER CAPACITY = total heating surface