REVIEW

Which principle best explains why water tube boilers operate at higher pressures than fire tube boilers?

• Larger water storage volume

• Tubes withstand higher pressure due to smaller diameter

• Gas flow inside tubes reduces stress

• Shell thickness is minimized

If boiler pressure suddenly drops during operation, what is the most likely effect on steam quality?

• Dry steam is produced

• Steam becomes wet due to flashing

• No change in steam properties

• Pressure has no link to steam dryness

Analyzing operating principles, why is maintaining constant pressure critical in marine boilers?

• Prevents overheating of economizer

• Ensures uniform steam supply to turbines

• Avoids slag buildup in furnace

• Reduces refractory wear

Which factor directly distinguishes saturated steam vs. superheated steam in marine boilers?

• Operating pressure difference

• Heat added after steam drum

• Boiler shell thickness

• Blowdown method

Comparing steady vs. fluctuating boiler pressure, which operational problem is most likely during fluctuations?

• Reduced fuel efficiency

• Increased water circulation

• Stable superheating

• Decreased heat loss

Why is boiler pressure usually measured in bar or MPa rather than PSI in maritime standards?

• SI units provide universal standardization

• PSI is less accurate

• Metric units reduce heat loss

• Boilers only use metric gauges

If pressure is raised but temperature remains constant, which thermodynamic principle is illustrated?

• Charles’ Law

• Boyle’s Law

• Dalton’s Law

• Pascal’s Principle

Which factor best explains why superheaters are integrated into high-pressure boilers?

• To lower fuel consumption

• To reduce moisture content in steam

• To prevent soot formation

• To improve feedwater heating

Which classification best differentiates a fire tube boiler from a water tube boiler?

• Type of fuel used

• Heat transfer direction

• Boiler efficiency

• Furnace design

Analyzing function, why are auxiliary boilers used on ships?

• To supply main propulsion steam

• To provide steam for hotel services and machinery

• To reduce economizer soot deposits

• To replace exhaust gas boilers