Question

In: Civil Engineering

Multiple choice Mark one or more correct answers to the following questions: a. Which of the...

Multiple choice Mark one or more correct answers to the following questions:

a. Which of the following properties is the best indicator of the materials resistance to the plastic deformation

A. young’s modulus

B. yield strength

C. tensile strength

D. percent elongation

b. Martensite steel is brittle because of:

A. tempering

B. grain size strengthening

C. strain hardening

D. solid solution hardening

c. Electroneutrality may be maintained in the introduction of Na+ impurity in FeO by simultaneously introducing:

A. an interstitial oxygen for every two Na+

B. an interstitial Fe2+ for Na+

C. an oxygen vacancy for every two Na+

D. conversion of an Fe2+ to Fe3+ .

d. Strength of a glass piece can be enhanced by:

A. precipitation hardening

B. annealing

C. reducing the average grain size

D. tempering

E. cold working

e. An eutectic alloy is characterized by

A. lenticular particles in a solid phase

B. alternating layers of two phases

C. a substitutional solid solution

D. a concentration ingredient

Expert Solution

Ans A : A) Young`s Modulus and C) Yield Strength ,It has two right answers to it that is, it is the best indicator of the material resistance to the plastic deformation along with young`s modulus as well .

Ans B : A) Tempering and C) Strain Hardening ,It also has two right answers for this that is, Martensite steel is brittle due to the method of strain hardening and Tempering

Ans C : A) an interstitial oxygen for every two Na+ , you have to remove every two Na+ with oxygen placed at an interstital point in the crystal lattice .

Ans D : D) Tempering , it is used to enhance the strength of a glass piece . In this the piece of a glass is being heated at controlled temperature which makes the glass four times more than stronger .

Ans E : B) alternating layers of two phases , This is being done for with the mixture of metals having melting point lower than their components .

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Ally Wells answered 8 months ago

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