4th Class Power Engineering Unit A6 Chapter 1 Energy Plant Construction and Operation Materials (rated 100% correct answers with questions).

4th Class Power Engineering Unit A6
Chapter 1: Energy Plant Construction
and Operation Materials (rated 100%
correct answers with questions).


Materials, which will break rather than bend when subjected to an outside force are said to be:

Select one:

a. tough

b. malleable

c. hard

d. brittle ANS - d



Brass is an alloy of:

Select one:

a. copper and bronze

b. copper and lead

c. brass and lead

d. copper and zinc ANS - d



In order to avoid residual stresses after welding, alloy steels:

Select one:

a. cannot contain any carbon

b. should be heated before, during, and after welding

c. are not affected by carbon content

d. must be heated after welding ANS - b

, A material that can be drawn out or extended in length without breakage is said to be:

Select one:

a. hard

b. brittle

c. ductile

d. chilled ANS - c



Malleability of a metal:

Select one:

a. will usually decrease as the temperature rises

b. is checked using the Charpy tester

c. means it will crack when struck with a hammer

d. usually increases with the addition of heat ANS - d



An element, which reduces creep in metal, is:

Select one:

a. nickel

b. copper

c. vanadium

d. molybdenum ANS - d



Resistance to indentation refers to a metals property which is:

Select one:

a. brittleness

b. hardness

c. malleability

d. toughness ANS - b



Nickel when added to steel: