Q1: A jet engine turbine blade is normally manufactured by

ANS:C - investment casting.

A jet engine turbine blade is typically manufactured by investment casting. Explanation:

1. Investment Casting: This manufacturing process, also known as precision casting or lost-wax casting, involves creating a wax pattern of the desired part (in this case, a turbine blade). This wax pattern is coated with a ceramic slurry to form a mold. Once the mold is cured, the wax is melted out, leaving behind a cavity in the shape of the part. Molten metal is then poured into the cavity, filling the space and forming the final part. Investment casting allows for the production of complex shapes with high accuracy and surface finish, making it well-suited for manufacturing turbine blades used in jet engines.

Other methods like forging involve shaping metal through applying compressive force, shell molding involves creating sand molds using a heated metal pattern, and pressure die casting involves injecting molten metal into a steel mold cavity at high pressure. While these methods may be used in other applications, investment casting is the preferred method for turbine blade manufacturing due to its ability to produce intricate shapes and maintain dimensional accuracy.