The auxiliary oil-fired water-tube steam...

Question 1 / 2066636eef28f7522a1c51f78f

Question 1 of 2066636eef28f7522a1c51f78f

The auxiliary oil-fired water-tube steam boiler on your ship-docking tug is equipped with a water column similar to that shown in the illustration. Assuming that the water level is at the normal operating water level (NOWL) of the boiler, what would be the result of alternately opening and reclosing each of the water column tri-cocks? Illustration MO-0093

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🔍 Key Concepts

• Water column on a boiler shows the same water level as in the drum when the upper and lower connections are clear. • Each tri-cock is at a fixed height; what comes out (steam vs water) tells you whether that point is above or below the actual water level. • At normal operating water level (NOWL), the gauge glass shows where the steam-water interface is relative to the three tri-cocks.

💭 Think About

• Look carefully at the illustration: is the NOWL shown above, below, or between any of the three tri-cocks on the water column? • For each tri-cock, ask: is its port located above the water line (so it would open to steam space) or below the water line (so it would open to water)? • Which answer choice best matches the pattern of steam vs water you would expect at those three vertical positions when the boiler is at NOWL?

✅ Before You Answer

• Be sure which tri-cock is uppermost, middle, and lowermost in the illustration before matching to the choices. • Confirm in your mind that steam will issue from any tri-cock that opens into the steam space and water from any tri-cock that opens into the water space at NOWL. • Verify that your chosen option is consistent for all three tri-cocks at the same, single water level—no contradictions.

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Question 1 of 20

Steam should issue from the uppermost tri-cock, and water should issue from lowermost tri-cock. Either steam or water could issue from the middle tri-cock.

Water should issue from each of the uppermost, middle, and lowermost tri-cocks.

Steam should issue from the uppermost tri-cock, and water should issue from both the middle and lowermost tri-cocks.

Steam should issue from both the uppermost and middle tri-cocks, and water should issue from the lowermost tri-cock.

Question 1 / 2066636eef28f7522a1c51f78f

Question 1 of 2066636eef28f7522a1c51f78f

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Question 1 of 20

66636eef28f7522a1c51f78f

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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