Q.1.
What is creep?
- a) Under low sustained stress, it is tendency of some materials to get deform slowly and permanently
- b) Under zero stress, it is permanent deformation
- c) High lift device
- d) Anti ice device
Q.2.
Which of the following is correct?
- a) Corrosion is major problem in terms of material lifespan
- b) Corrosion cannot be considered as major factor at all
- c) Lift on corrosive material will always be same as weight
- d) Weight of corrosive material will always be same as thrust loading
Q.3.
Let us consider the ambient air temperature is 25°C and aircraft has Mach number of 1.Find the stagnation temperature.
- a) 432.32K
- b) 789K
- c) 123.56K
- d) 213.458K
Q.4.
What is the advantage of wood?
- a) Easy to fabricate
- b) Moisture sensitivity
- c) Complexity during fabrication
- d) Non availability
Q.5.
Which of the following is correct?
- a) Wood sufferers from moisture sensitivity
- b) Wood is not available, it is rare to find
- c) Lift of wooden box will be same as drag
- d) Wood surface is not sensitive to moisture at all
Q.6.
For high strength applications ____ is widely used.
- a) 7075 aluminum alloy
- b) 7089 magnesium zinc
- c) 1098 gallium
- d) Ge-Zn alloy
Q.7.
Magnesium is used for ________
- a) control hinges
- b) highest strength application
- c) lofting
- d) drafting
Q.8.
Following diagram represents _________
- a) whisker reinforced composite
- b) matrix only
- c) fiber only
- d) aluminum alloy
Q.9.
Following diagram represents _________
- a) fiber reinforced polymer
- b) fiber reinforced nitrate only
- c) matrix arrangement only
- d) magnesium arrangement
Q.10.
Whiskers are ________
- a) isotropic
- b) isothermal
- c) isobaric
- d) isentropic compression
Q.11.
Composite material has only one material.
- a) True
- b) False