This set of Aerospace Materials and Processes MCQs focuses on “Applications and Properties of Magnesium and it’s alloys”.
1. Magnesium alloys can be made into ___________ sophisticated structures compared to aluminium alloys.
Explanation: Magnesium alloys can be made into much more sophisticated shapes compared to aluminium alloys. This is if proper equipment is used. This is due to the difference in properties like strength and structure.
2. Which of the following components of aircraft can be manufactured using magnesium?
c) Engine, landing gear
d) Landing gear
Explanation: Magnesium and magnesium alloys are used extensively in the aerospace industries due to their beneficial properties. They are used in the manufacturing of engine, landing gear and several other parts of an aircraft.
3. Magnesium __________ fuel efficiency.
d) does not affect
Explanation: One of the advantages of using magnesium in industries is improved fuel efficiency. Fuel efficiency is a means of thermal efficiency. Fuel efficiency is the conversion of potential energy in fuel into work.
4. Magnesium powder can be used for photographic applications.
Explanation: The above statement is correct. Magnesium and magnesium alloys are utilized in several industries across the world. For example, it is used in the automobile industry, electrical industry and for photographic applications as well.
5. Magnesium is the most abundant element found in the earth’s crust.
Explanation: The above statement is incorrect. It is not the most abundantly found element on earth. The most abundant metal on earth is aluminium and the most abundant element on planet earth is oxygen.
6. Magnesium can be found in ____________
a) Greece, Antarctica
c) USA, Greece
Explanation: Magnesium is found in the form of ores in several places around the world. From the ores, magnesium is extracted. Magnesium can be found in Greece, the united states and several other countries.
7. The modulus of elasticity of pure magnesium is __________
a) 6,500,000 p.s.i
b) 4,350,000 p.s.i
c) 16500 ksi
d) 330,00,000 p.s.i
Explanation: The modulus of elasticity can be described as the resistance of a substance to elastic deformation when it is subjected to stress. The modulus of elasticity of magnesium is 6,500,000 p.s.i and that of aluminium is 4,350,000 p.s.i.
8. The density of pure magnesium is ___________
a) 4.506 gram per cubic centimeter
b) 2.7 gram per cubic centimeter
c) 12.35 lb./cu.in.
d) 0.064 lb./cu.in.
Explanation: The density of a material is the ratio of the amount of mass to the volume. The density of pure magnesium is 0.064 lb./cu.in. The density of titanium is 4.506 gram per cubic centimeter and that of aluminium is 2.7 gram per cubic centimeter.
9. Magnesium alloys have very __________ notch sensitivity in fatigue.
Explanation: While magnesium is a favorable element to use for several purposes, it also has some disadvantages. Magnesium alloys have bad notch sensitivity in fatigue. They also tend to have poor toughness.
10. Deficiency of magnesium can result in ____________
a) versatile vision
b) high blood pressure
c) moderate blood Pressure
d) high energy
Explanation: The human body requires various nutrients for nourishment. Magnesium is also necessary for specified quantities. Deficiency of magnesium can result in high blood pressure and affect an individual’s health.
Sanfoundry Global Education & Learning Series – Aerospace Materials and Processes.
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