A Well-Known Technique for Achieving a Very Tight Fit Between

question 41

Multiple Choice

A well-known technique for achieving a very tight fit between two components is to expand by heating and then cool to shrink fit. For example, an aluminum ring of inner radius 5.98 cm needs to be firmly bonded to a cylindrical shaft of radius 6.00 cm measurements are at 20°C) . Calculate the minimum temperature to which the aluminum ring needs to be heated before it can be slipped over the shaft for fitting.Coefficient of linear expansion for Al = 24 × 10⁻⁶/K.)

• A) 140°C
• B) 850°C
• C) 120°C
• D) 160°C
• E) 180°C

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Definitions:

Uvula

A small fleshy extension at the back of the soft palate which hangs above the throat and plays a role in speech and swallowing.

Upper Esophageal Sphincter

The muscular ring located at the top of the esophagus that controls the passage of food into the esophagus from the throat.

Pharyngeal Phase

A phase in the swallowing process where the bolus is moved from the mouth to the esophagus involving the contraction of pharyngeal muscles.

Esophageal Phase

A phase of swallowing during which the bolus moves from the esophagus into the stomach, involving coordinated muscular contractions.