D bmi resins are commonly used for automotive

d) BMI resins are commonly used for automotive applications.
8.
a) Phenolics are formed by the reaction between phenol and ethylene glycol.
b) The formation of phenolics is a condensation process where alcohol is the
condensate.
c) Compared to epoxy resins, phenolics have low shrinkage.
d) Compared to epoxy resins, phenolics have higher temperature resistance.
9.
a) In carbon/carbon composites, carbon fibers are mixed in bulk carbon
matrix.
b) Carbon/carbon composites are most often made from carbon fiber
reinforced epoxy.
c) Carbon/carbon composites have the highest energy absorption (specific
heat capacity) than any known material.
d) Carbon/carbon composites are not used very much due to poor bonding
between carbon fiber and carbon matrix.
10.
a) For advanced thermoplastic composites, the thermoplastic matrix is
usually polyethylene, polypropylene, or nylon.
2

b) For advanced thermoplastic composites, the thermoplastic matrix resin is
usually polyetheretherketone, or polyphenylene sulfide.
c) The advantage of thermoplastic composites over thermoset composites is
that thermoplastic composites have less void content as a result of
manufacture.
d) The disadvantage of thermoplastic composites as compared to thermoset
composites is that thermoset composites have higher fracture toughness.
11.
11.
12.Which of the following fibers has orthotropic properties? 13. In making a part made of carbon fiber/epoxy composites using an autoclave, which
of the following materials should be used for the mold, in terms of matching coefficient
of thermal expansion?
a) Aluminum
b) Steel
c) Cast Iron
d) Carbon/epoxy composite
14.When setting the filament winding parameters such as the wind angle, the dwell
angle, the band width, the resin formulation, the tension in the fibers etc, which of the
following parameters can be changed without affecting the performance of the product?