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-11- 02265020/CAPE/KMS 2015 SPEC

GREEN ENGINEERING
UNIT 2 - PAPER 02
KEY AND MARK SCHEME

Question 5.

S.O Suggested Response Mark Marks
Allocation KC AK PA

(a)(i) 5 5

 Analyse fully the product specifications and
determine the minimum acceptable values for
all relevant material properties.

 Make first selection by eliminating all
materials which do not possess all the
minimum criteria

 Assess the degree of relative importance of
the various required properties from
essential through desirable for each
property

 Place the potential materials in ranking
order

 Evaluate material and process costs for each
material

 Optimize to determine the materials which
give the best overall combination of
properties for the least cost

(a) (ii) 22

 Availability of the materials for the
manufacturing of PCC

 Low cost materials

(a) (iii) 22

Concrete is brittle and cannot accommodate
plastic deformation as steel does. Lower
strains will cause concrete to fail.