Hi, i need answers to few questions for my exam which i\'ll be writing in a few

Question

Hi, i need answers to few questions for my exam which i'll be writing in a few days, please help
1)In a Fibre Reinforced Composite
a)Matrix is stronger than fibre
b)Matrix is weaker than fibre
c)Matrix & fibres are of equal strenght and
d)None

2)A fatigue fracture is characterized by
a)Ductile fracture
b)Brittle fracture
c)CUp & cone formation and
d)None

3)Which is the most effective alloying element in increasing tha harness of steel for the same percentage of composition?
a)Mo
b)Ni
c)Cu
d)Cr

Explanation / Answer

Usually the fibre is stronger than the matrix

Fatigue fracture is usually brittle, since the constant cyclic loading acts like cold-working, raising the yield stress.

Im not sure, but I think molybdenum.

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