Internal threads are cut with a tap. Name the three styles and tell when each one is used.

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

Fluids at rest possess no flow energy. a)- true b)- false

The higher the astm grain size number, the finer the gran is. a)-true b)-false