Which of the following statements is/are true? (a). engineers apply tolerances to part dimensions to reduce the amount of variation that occurs during production of part. (b). best engineering practice is to design and manufacture parts to a highly precise tolerances. (c). tighter tolerances are an indication of a better product design. (d). a and b. (e). a, b and c. d o (f). a and c only.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?

Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis