Engineering Materials Mcqs - Set 1

1)   Malleability of a material can be defined as ______________________?

a. ability to undergo large permanent deformations in compression
b. ability to recover its original form
c. ability to undergo large permanent deformations in tension
d. all of the above
e. none of the above
Answer  Explanation 

ANSWER: ability to undergo large permanent deformations in compression

Explanation:
No explanation is available for this question!


2)   Mild steel belongs to the following category___________________?

a. low carbon steel
b. medium carbon steel
c. high carbon steel
d. alloy steel
e. special steel
Answer  Explanation 

ANSWER: low carbon steel

Explanation:
No explanation is available for this question!


3)   Stress relaxation is- the phenomenon ___________________?

a. in which parts are not loaded
b. in which stress remains constant on in-creasing load
c. in which deformation tends to loosen the joint and produces a stress reduced
d. stress reduces on increasing load
e. none of the above
Answer  Explanation 

ANSWER: in which deformation tends to loosen the joint and produces a stress reduced

Explanation:
No explanation is available for this question!


4)   Isotropic materials are those which have the same ____________________?

a. elastic properties in all directions
b. stresses induced in all directions
c. thermal properties in all directions
d. electric and magnetic properties in all directions
e. density throughout
Answer  Explanation 

ANSWER: elastic properties in all directions

Explanation:
No explanation is available for this question!


5)   The ability of a material to resist softening at high temperature is known as____________________?

a. creep
b. hot tempering
c. hot hardness
d. fatigue
e. superhardening
Answer  Explanation 

ANSWER: hot hardness

Explanation:
No explanation is available for this question!


6)   The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to l00°C will _________________?

a. increase
b. decrease
c. remain same
d. first increase and then decrease
e. show unpredictable behaviour
Answer  Explanation 

ANSWER: increase

Explanation:
No explanation is available for this question!


7)   Points of arrest for iron correspond to__________________?

a. stages at which allotropic forms change
b. stages at which further heating does not increase temperature for some time
c. stages at which properties do not change with increase in temperature
d. there is nothing like points of arrest
e. none of the above
Answer  Explanation 

ANSWER: stages at which allotropic forms change

Explanation:
No explanation is available for this question!


8)   A material is known as allotropic or polymorphic if it __________________?

a. has a fixed structure under all conditions
b. exists in several crystal forms at different temperatures
c. responds to heat treatment
d. has its atoms distributed in a random pattern
e. none of the above
Answer  Explanation 

ANSWER: exists in several crystal forms at different temperatures

Explanation:
No explanation is available for this question!


9)   Which of the following constituents of steels is softest and least strong ________________?

a. austenite
b. pearlite
c. ferrite
d. cementlte
e. bainite
Answer  Explanation 

ANSWER: ferrite

Explanation:
No explanation is available for this question!


10)   The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________?

a. 770°C
b. 910°C
c. 1050°C
d. below recrystallisation temperature
e. above recrystallization temperature
Answer  Explanation 

ANSWER: 770°C

Explanation:
No explanation is available for this question!


11)   Ferromagnetic alpha iron exists in temperature range of________________?

a. below 723°C
b. 770 – 910°C
c. 910-1440°C
d. 1400-1539°C
e. above 1539°C
Answer  Explanation 

ANSWER: below 723°C

Explanation:
No explanation is available for this question!


12)   A reversible change in the atomic structure of steel with corresponding change in the properties is known as___________________?

a. molecular change
b. physical change
c. allotropic change
d. solidus change
e. atomic change
Answer  Explanation 

ANSWER: allotropic change

Explanation:
No explanation is available for this question!


13)   The crystal of alpha iron is ____________________?

a. body centred cubic
b. face centred cubic
c. hexagonal close packed
d. cubic structure
e. orthorhombic crystal
Answer  Explanation 

ANSWER: body centred cubic

Explanation:
No explanation is available for this question!


14)   For the allotropic forms of iron, the points of arrest are __________________?

a. the points where no further change oc-curs
b. constant for all metals
c. the points where there is no further flow of metal
d. the points of discontinuity
e. the points where major changes take place
Answer  Explanation 

ANSWER: the points of discontinuity

Explanation:
No explanation is available for this question!


15)   The percentage of carbon in grey iron castings usually varies between __________________?

a. 0.5 to 1%
b. 1 – 2%
c. 2.5 to 4.5%
d. 5 – 7%
e. 7-9%.
Answer  Explanation 

ANSWER: 2.5 to 4.5%

Explanation:
No explanation is available for this question!


16)   The unique property of cast iron is its high ___________________?

a. malleability
b. ductility
c. surface finish
d. damping characteristics
e. hardness
Answer  Explanation 

ANSWER: damping characteristics

Explanation:
No explanation is available for this question!


17)   In grey cast iron, carbon is present in the form of____________________?

a. cementite
b. free carbon
c. flakes
d. spheroids
e. nodular aggregates of graphite
Answer  Explanation 

ANSWER: flakes

Explanation:
No explanation is available for this question!


18)   In malleable iron, carbon is present in the form of___________________?

a. cementite
b. free carbon
c. flakes
d. spheroids
e. nodular aggregates of graphite
Answer  Explanation 

ANSWER: nodular aggregates of graphite

Explanation:
No explanation is available for this question!


19)   The following types of materials are usually the most ductile__________________?

a. face-centred cubic lattice
b. body-centred cubic lattice
c. hexagonal close-packed lattice
d. all of the above
e. none of the above
Answer  Explanation 

ANSWER: face-centred cubic lattice

Explanation:
No explanation is available for this question!


20)   Sulphur in pig iron tends to make it___________________?

a. hard
b. soft
c. ductile
d. tough
e. malleable
Answer  Explanation 

ANSWER: hard

Explanation:
No explanation is available for this question!