What causes thermal hardening??
What will be an ideal response?
Thermal hardening can occur if a pipe is flame-cut, welded on, or overheated with an abrasive cutoff wheel.?
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Which is of better quality for plant growth, topsoil or subsoil? Why?
What will be an ideal response?
Which one of the following is not a hardwood typically chosen as finish flooring?
A) Maple B) Hemlock C) Oak D) Walnut
Consider a medium in which the heat conduction equation is given in its simplest form as 
(a) Is heat transfer steady or transient? (b) Is heat transfer one-, two-, or three-dimensional? (c) Is there heat generation in the medium? (d) Is the thermal conductivity of the medium constant or variable?
A system has an impulse response, 
(a) Sketch the magnitude and phase of the frequency response of these two systems in a parallel connection. (b) Sketch the magnitude and phase of the frequency response of these two systems in a cascade connection.