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18 Cards in this Set
- Front
- Back
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One of the earliest firetube boilers was the
a) locomotive boiler b) firebox boiler c) HRT boiler d) Haycock boiler e) marine boiler |
C
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An internally fired boiler a) is less efficient than an externally fired unit b) utilizes a high amount of refractory, firebrick, or both c) has the furnace surrounded by water d) must be a watertube type e) requires a setting |
C
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The forerunner of the modern packaged firetube boiler was the a) horizontal return tubular boiler b) locomotive boiler c) firebox boiler d) Sterling boiler e) Scotch Marine boiler |
E
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Initially the firetube boiler was not up to manufacturing expectations because a) too many equipment suppliers were involved in its manufacture b) the boiler plate was inferior c) there were no legislative standards set d) the unit was constructed at the factory e) tradesmen were not licensed and properly qualified |
A
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Smaller firetube boilers are low cost and a) have simple rugged construction b) require very critical water treatment c) are not very suitable for ON-OFF operation d) do not cause much damage on waterside rupture e) reach operating pressures very quickly from cold start |
A
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When a packaged firetube boiler is used as a power boiler rather than a heating unit a) it will have a much stronger design b) only the burner will be changed or different c) it cannot be used as a hot water unit d) vibrations will be greater thereby requiring stronger foundations e) more accessories will have to be added |
A
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The steam pressure must not exceed _________ kPa for a boiler to be considered a heating boiler. a) 15 b) 25 c) 50 d) 100 e) 103 |
E
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The temperature of a boiler must not exceed __________ degrees Celsius or the pressure exceed 1130 kPa for it to be considered a heating boiler. a) 250 b) 212 c) 150 d) 121 e) 103 |
D
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To maintain high gas velocities throughout all gas passes in a four-pass firetube boiler, the cross-sectional area of each succeeding pass is a) increased b) decreased c) doubled d) tripled e) quartered |
B
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A firetube boiler commonly used for hot water heating systems in residences and small apartments is the a) Scotch firetube packaged unit b) HRT unit c) steel plate vertical unit d) firebox unit e) tubular unit |
C
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A steel plate vertical firetube unit is divided into two sections and the upper part is often called the a) reversing section b) furnace c) expansion tank d) flue gas collector section e) heat exchanger |
E
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When the hot combustion gases travel through boiler tubes which are surrounded by the boiler water, the boiler is called a a) watertube boiler b) tubular boiler c) packaged boiler d) coil type boiler e) firetube boiler |
E
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Packaged firetube boilers a) are not very rugged relative to portability b) have very specific design pressures to meet customer needs c) require relatively small building volumes d) require special foundations or footings e) have maintenance access difficulties |
C
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When a packaged firetube boiler is used as a hot water unit a) it can be constructed of thinner material for a given pressure b) an atmospheric burner must be used c) it will not require an expansion tank d) forced circulation is required e) the water column and gage glass must be raised slightly |
D
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The advantages of a packaged boiler are: 1. lower freight costs because of less handling 2. lower initial cost because they are mass produced 3. quality control is easier to implement 4. the boilers can be factory tested before being sent to the customer 5. it requires little time to put the unit into operation at the plant site a) 1, 3 b) 2, 5 c) 2, 3, 4 d) 1, 2, 3, 4, 5 e) 2, 3, 4, 5 |
D
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The chief advantage of a packaged boiler is that it can be a) operated without supervision b) operated without any water treatment c) mass produced d) operated without any pumps e) assembled on location at the plant site |
C
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One of the advantages of the firetube boiler over the watertube and tubular boiler is in the a) fuel and combustion area b) water consumption area c) water treatment area d) electricity consumption area e) operation safety area |
C
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The advantage of a vertical firetube boiler is that it requires a) very little floor space b) no fuel handling equipment c) very small amount of fuel for combustion d) no water treatment e) very small amounts of water to produce steam |
A
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