A tank's air space above oil (specific gravity 0.8) has a pressure of 0.1 kg/cm”. What is the fluid pressure at a depth of 2.5 m below the oil surface __________________?
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Answer: B. 3 metres of water column
Explanation
Fluid pressure equals head multiplied by specific gravity combined with overlying gas pressure heads. An oil depth of 2.5 meters with specific gravity zero point eight equals two meters of water column pressure. Adding the one-meter equivalent water column from the zero point one kg per square cm air pressure gives three meters total. Hydrostatic pressure calculations convert fluid heights into equivalent water column heads using specific gravity values. Pressure expressed in kg per square centimeter converts to meters of water by multiplying by ten. Total pressure at a submerged depth is the sum of overlying gas pressure and the hydrostatic head of the liquid.
Option A underestimates the total pressure by omitting the added air space pressure contribution. Option C overestimates the resulting pressure head by miscalculating the oil specific gravity conversion. Option D suggests four meters of water column, which exceeds the calculated sum of oil and air pressures.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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