1. Landing gear wheels are made of rubber to absorb shock.
a) True
b) False
Explanation: Landing gear wheels are made of thick rubber. This is to absorb the shock waves and vibration caused when landing an aircraft. It also prevents the loss of fluids. Rubber is a good nonmetallic component of aircraft.
2. What does a good working property of material mean?
a) To have high strength
b) To be able to bend or machine the material in the desired shape
c) To have a corrosive nature
d) To ability to join the material in the desired shape
Explanation: The working property of a material is the ability to change its shape in the required form. The ability to join the material is called joining property. They are important in the fabrication of aircraft parts.
3. Which of the following is a mechanical property of materials?
a) Color
b) Appearance
c) Reliability
d) Elasticity
Explanation: Elasticity is a mechanical property. It is the ability of a material to return to its original shape after the material undergoes deformation. Appearance and colour are physical properties of a material.
4. An aircraft material should be resistant to ______________
a) join
b) work
c) shock loads
d) strength
Explanation: An aircraft should be resistant to shock loads. Joining property and working property are important for the design and fabrication of components. Strength is an advantageous property for a material.
5. What is the fuselage of an aircraft made of?
a) Pure iron
b) Acrylic
c) Aluminium alloy
d) Magnesium
Explanation: The fuselage of an aircraft is typically made of aluminium alloys. The fuselage is the mainframe of an aircraft. Aluminium alloy is chosen because it has favorable properties, like high ductility, high strength/weight ratio etc.
6. Which of the following materials is used in making aircraft windows??
a) Thick glass
b) Plexiglass
c) Graphite
d) Plane glass
Explanation: Plexiglass is the material used in making aircraft windows. It is preferred instead of plane glass. It has attractive properties, like its strength and transparency. Aircraft windows are made of several layers.
7. Magnesium and its alloys are suitable to use in the construction of helicopters.
a) True
b) False
Explanation: Magnesium and its alloys are suitable to use while making helicopters. This is because it is lighter in weight compared to aluminium. It is a good structural metal to use. But it is not resistant to corrosion.
8. What is the thickness of the sheets used in manufacturing oil tanks??
a) 1.5 to 26 mm
b) 0.889 to 1.2446 mm
c) 5.9 to 10.21 mm
d) 0.5 to 0.7 mm
Explanation: Oil tanks are usually made with aluminium or its alloys, although magnesium can also be used. The thickness of the sheets used is somewhere between 0.889 to 12.446 mm. The thickness depends upon various parameters like shape, size, etc.
9. Which of the following can be used as wing covering in an aircraft?
a) Manganese alloy
b) Carbon
c) Titanium
d) Aluminium alloy
Explanation: Aluminum alloy can be used as a covering for wings in an aircraft. There are other materials that can be used, like fabric and plywood. Carbon, titanium and manganese alloy are not used for this purpose.
10. Controls can be made using _____________
a) wood
b) copper
c) steel
d) flaps
Explanation: Controls can be made using either steel or aluminium alloys. Controls refer to the control parts of an aircraft like control sticks, torsion tubes, bell-cranks etc. Wood and copper are not used.