Q1: For specified tube outside diameter, higher BWG means higher

ANS:B - cross-sectional area

Cross-sectional area refers to the area of a two-dimensional shape that is exposed when you cut through an object perpendicular to its longest axis. In simpler terms, it's the area of the shape you see when you look at it from the side after cutting it. For example, if you cut a cylindrical pipe horizontally, the shape you see in the cross-section would be a circle. The area of this circle is the cross-sectional area of the pipe. Similarly, if you cut a rectangular block horizontally, the shape you see in the cross-section would be a rectangle, and the area of this rectangle is the cross-sectional area of the block. Cross-sectional area is a crucial parameter in various fields, including physics, engineering, and geometry. It's used to calculate various properties such as volume, moment of inertia, and resistance to deformation or stress. In fluid dynamics, for instance, cross-sectional area is important for calculating flow rates and velocities within pipes or channels. In structural engineering, it's important for assessing the load-bearing capacity of beams or columns. The Birmingham Wire Gauge (BWG) is a system for defining the thickness of a metal wire or sheet used in various applications, including tubing. In the BWG system, a higher BWG number corresponds to a thinner thickness of the metal. Given that the BWG system operates inversely to thickness (i.e., higher BWG numbers indicate thinner materials), none of the options provided are correct.

• Tube thickness: Higher BWG numbers actually indicate a thinner tube wall thickness.
• Cross-sectional area: Higher BWG numbers do not imply an increase in cross-sectional area; in fact, they suggest the opposite—a decrease in cross-sectional area due to the thinner material.
• Weight per unit length: With a thinner tube wall, the weight per unit length would decrease, not increase.