Which of the following is an example of a "Engineering Control"? A. Safety poster
B. Hard hat
C. Cover over a shock hazard on a machine
D. Steel toe boots

What is creep? what is stress relaxation?

The proportional limit is always greater than the yield strength for a material. a)-trune b)- false

Apreheater involves the use of condensing steam at 100°c on the inside of a bank of tubes to heat air that enters at 1 atm and 25°c. the air moves at 5 m/s in cross flow over the tubes. each tube is 1 m long and has an outside diameter of 10 mm. what is the minimum value of nl needed to achieve an outlet temperature of t 75 c? what is the corresponding pressure drop across the tube bank?