1) Polypropylene (PP) has a glass-transition temperature of -15
and a melting temperature of 175
oC. This means that at a
temperature of -40 oC
that PP is ________, and at temperature
0 oC PP is _________
(A) brittle, brittle (B) ductile,
brittle (C) brittle, ductile
(D) ductile, ductile (E) low in
thermal conductivity, high
in thermal conductivity.
.2) Galvanized steel corrodes slowly in air because:
(A) the Sn coating completely
covers the steel.
(B) the Zn coating completely
covers the steel.
(C) the Zn corrodes rather than
(D) the Sn corrodes rather than
(E) the Fe has an
adherent oxide layer.
3) Stopping the motion of which imperfection in metals results
strengthening the metal (at low
temperature): (A) vacancies
(B) grain boundaries (C)
inclusions (D) dislocations
4) Which process for a plain carbon steel (1080) results in
(A) anneal (B) austemper (C)
(D) interrupted quench (E) quench
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