Boilers: identify the correct statement for a water-tube boiler In water-tube designs, compare the path of water versus the path of hot gases and flames. Choose the correct option.
Mechanical Engineering
Steam Boilers and Engines
Difficulty: Easy
Choose an option
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AWater passes through tubes surrounded by flames and hot gases
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BFlames and hot gases pass through tubes surrounded by water
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CForced circulation necessarily takes place in all water-tube boilers
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DNone of these
Answer
Correct Answer: Water passes through tubes surrounded by flames and hot gases
Explanation
Concept and identificationIn a water-tube boiler, the water/steam flows inside the tubes while the hot gases flow externally over the tube bank. This is the core distinction from fire-tube boilers, where hot gases are inside the tubes and water surrounds them.
Why the other options are incorrect(b) describes a fire-tube boiler, not a water-tube boiler. (c) is too strong: many water-tube boilers use natural circulation (e.g., Babcock & Wilcox); forced circulation exists but is not universal.
Final AnswerWater passes through tubes surrounded by flames and hot gases