Engineering Questions with Answers - Multiple Choice Questions

Materials Science MCQ’s – High Temperature Alloys

1 - Question

Which of the following is not an alloy?
a) Duralumin
b) Bismuth
c) Magnalium
d) Alnico
View Answer Answer: b
Explanation: Bismuth is a metal with symbol Bi and atomic number 83. Duralimn is an alloy of copper, magnalium is an alloy of magnesium and Alnico is an alloy of aluminium, copper and cobalt.



2 - Question

Which of the following is a high temperature alloy resistant to?
a) Tensile compression
b) Tensile elongation
c) Creep
d) Fatigue
View Answer Answer: c
Explanation: Alloys resistant to creep have high melting temperature and therefore are high temperature alloys.



3 - Question

Alloys resistant to creep have a high modulus of elasticity.
a) True
b) False
View Answer Answer: a
Explanation: The above statement is true. An alloy which is resistant to creep have a high modulus of elasticity and have high melting point thus giving then the name high temperature alloys.



4 - Question

Which of the relationship holds?
a) Higher the melting temperature greater is the elastic modulus
b) Lower the melting temperature greater is the elastic modulus
c) Higher the melting temperature smaller is the elastic modulus
d) There is no relationship between the melting temperature and elastic modulus
View Answer Answer: a
Explanation: The melting temperature of an alloy and its modulus of elasticity hold a direct relationship. Therefore, higher the melting temperature greater is the elastic modulus.



5 - Question

Which of the following doesn’t have high resistance to creep?
a) Stainless steel
b) Refractory metals
c) Superalloys
d) Magnesium
View Answer Answer: d
Explanation: Stainless steel, refractory metals and super alloys have resistance to creep and hence are used for high temperature usage. Magnesium doesn’t have a high resistance to creep.



6 - Question

Which of the following does not enhance the creep resistance of an alloy?
a) Solid-solution alloying
b) Addition of a dispersed phase
c) directional solidification
d) Heat treatment
View Answer Answer: d
Explanation: Heat treatment does not enhance the creep resistance of an alloy. Solid-solution alloying and addition of dispersed phase are used for that outcome. Other advanced techniques like directional solidification can also be employed.



7 - Question

Which of the following is created by directional solidification?
a) Single crystal components
b) Polycrystalline components
c) Short grains
d) Elongated grains
View Answer Answer: a
Explanation: In directional solidification, highly elongated grains or single-crystal components are formed.



8 - Question

Controlled unidirectional solidification of an alloy is a technique to increase creep resistance.
a) True
b) False
View Answer Answer: a
Explanation: The above statement is true. Controlled unidirectional solidification of alloys is a technique used to increase the creep resistance of an alloy.

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