1. If the thermal conductivity (k) of steel is 40 W/m, for copper k=401 W/m-k, and the glass k=10 W/m-k, which material will be the worst conductor of thermal energy?

A. Steel

B. Copper

C. Glass

D. They would all be equal

2. The convective heat transfer coefficient, h, can be increased by making luid flow turbulent. Given your search of the web, how should the Reynolds number (Re) be changed to increase h for flow in a pipe?

A. Re should be decreased below 2300

B. Re should be decreased below 1

C. Re should be increased above 2300

D. Re should be increased above 1