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MARINE ENGINEERING MIDTERM EXAM QUESTIONS WITH ACCURATE ANSWERS.

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MARINE ENGINEERING MIDTERM EXAM QUESTIONS WITH ACCURATE ANSWERS.

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Marine Engineering
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Marine Engineering









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Institution
Marine Engineering
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Marine Engineering

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Uploaded on
March 4, 2025
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Written in
2024/2025
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MARINE ENGINEERING MIDTERM EXAM QUESTIONS WITH
ACCURATE ANSWERS


In a boiler, what changes water to steam -- Answer ✔✔ heat energy of combustion
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For combustion in a boiler to occur, it must be supplied with what -- Answer ✔✔ fuel and air
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In an ideal combustion process, all of the carbon would be converted to what -- Answer ✔✔
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l. carbon dioxide l.




What kind of energy is stored in fuels? -- Answer ✔✔ Potential energy
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Which kind of a fuel is fossil fuel? -- Answer ✔✔ Gas, Coal, oil etc.
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What is the main product derived from combustion -- Answer ✔✔ carbon compounds
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What % of oxygen is in air -- Answer ✔✔ 20%
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Which device improves the efficiency of boiler feed water -- Answer ✔✔ the economizer
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The steam in the turbine issues from what kind of nozzles and strikes against what kind of
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l. blades -- Answer ✔✔ stationary nozzles and movable blades
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What is steam leaving the turbine called -- Answer ✔✔ exhaust steam
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What temp will steam exhausting to the atmosphere be -- Answer ✔✔ 212 F
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, What can low pressure steam be used for? -- Answer ✔✔ heating buildings or water
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What is created when using cooling water to condense steam -- Answer ✔✔ A vacuum
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Because the ________ is pure water, it is used as ___________ for the boiler -- Answer
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l. ✔✔ condensate
l.




Feedwater


What temp is steam at one atmosphere of pressure? -- Answer ✔✔ 212 F
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What well is part of the condenser? -- Answer ✔✔ the hot well
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What is one function of the turbine condenser? -- Answer ✔✔ to improve system efficiency
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What is the water level in a boiler steam drum controlled by -- Answer ✔✔ the automatic
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l. feedwater regulator l.




What is the water added to the closed boiler system to replace water losses called --
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l. Answer ✔✔ makeup water l. l. l.




Where is boiler steam temperature raised above saturation temperature -- Answer ✔✔ in
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l. the SUPERHEATER
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What happens to temperature and pressure in a superheater -- Answer ✔✔ temperature
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l. goes up and pressure remains unchanged
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What do steam jet air ejectors do -- Answer ✔✔ they continuously remove air that leaks
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l. into the condenser which causes reduced vacuum
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What circulates air through the furnace of a boiler -- Answer ✔✔ Forced Draft Fan
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