What is the maximum differential pressure measurable with a liquid manometer ______________ psi?
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Answer: B. 30
Explanation
Standard liquid manometers use columns of water or mercury limited by practical physical height constraints. Exceeding thirty psi requires excessively tall glass columns that become fragile and hazardous to operate. High pressure containment requires robust mechanical elements like bourdon tubes rather than open liquid columns. Manometers balance fluid pressure against the hydrostatic head of an indicating liquid column. The maximum measurable pressure depends directly on the density of the manometric fluid and column length. Mercury manometers provide higher pressure ranges than water columns due to mercury's high specific gravity.
Industrial pressure calibration benches use liquid manometers for low pressure and differential checks. Process plants avoid liquid column manometers for high pressure steam lines due to safety and containment risks. Low pressure ventilation and draft measurements utilize manometers safely within their design limitations. Option A underestimates the typical operating capability of dense mercury column manometers. Option C exceeds the safe physical height limit for standard glass tube manometers in industrial settings. Option D represents an excessively high pressure limit that would blow out standard manometric liquid.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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