This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “High Temperature Alloys”.
1. Which of the following is an alloy?
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. Which of the following is a high temperature alloy resistant to?
a) Tensile compression
b) Tensile elongation
Explanation: Alloys resistant to creep have high melting temperature and therefore are high temperature alloys.
3. Alloys resistant to creep have a high modulus of elasticity.
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. 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
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. Which of the following high resistance to creep?
a) Stainless steel
b) Refractory metals
Explanation: Stainless steel, refractory metals and super alloys have resistance to creep and hence are used for high temperature usage. Magnesium does have a high resistance to creep.
6. 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
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. Which of the following is created by directional solidification?
a) Single crystal components
b) Polycrystalline components
c) Short grains
d) Elongated grains
Explanation: In directional solidification, highly elongated grains or single-crystal components are formed.
8. Controlled unidirectional solidification of an alloy is a technique to increase creep resistance.
Explanation: The above statement is true. Controlled unidirectional solidification of alloys is a technique used to increase the creep resistance of an alloy.
Sanfoundry Global Education & Learning Series – Materials Science.
To practice all areas of Materials Science, here is complete set of 1000+ Multiple Choice Questions and Answers.