Airframe Structural Design Mid - I, September - 2014

1.Airframe structural design goes through
  • Specification of function
  • Design criteria
  • internal loads
  • All the above
Answer: D
2.Which of the following are door loads
  • Passengers
  • Cargo
  • Landing gear
  • All the above
Answer: D
3.Modes of failure in structure are _________________
  • Net section tension
  • Shear tear out
  • only (a)
  • (a) & (b)
Answer: D
4.Lock-bolt advantages has _______________
  • High reliability
  • Low weight
  • Low cost
  • all the above
Answer: A
5.A blind- bolt is that which can be installed from ______________
  • Two sides of assembly
  • One side of assembly
  • partial fitting
  • Low shear fitting
Answer: B
6.The Hi-lock fastener is basically
  • Low strength
  • medium strength
  • High strength
  • None
Answer: C
7.Taper-lock fastener is
  • An interference fit
  • Light weight
  • only (a)
  • None
Answer: A
8.Composite materials has
  • Low modulus
  • Low strength
  • Tiny diameter
  • All the above
Answer: A
9.Environmental stability of materials is retained by
  • Physical properties
  • Mechanical properties
  • Material properties
  • Both (a) & (b)
Answer: D
10.Dynamic pressure is measure of
  • potential energy in fluid
  • kinetic energy in fluid
  • only potential energy
  • None
Answer: B
11.A good overall structural concept incorporates new material , process during______________
Answer: Preliminary design effort
12.The primary objective of the structural designer is to achieve maximum __________and _________
Answer: Safety margin & reasonable life time
13.The most versatile tool in structural analysis is the use of ________________
Answer: Finite element modeling
14.The amount of additional loads depends on ______________ and ______________of the structure.
Answer: Turbulence & Load factor
15.Fuselage internal pressure depends on the ____________and the ______________ for the occupants.
Answer: Cruise altitude & comfort desired
16.Miscellaneous loads are usually applied to design _________________ airframe structure.
Answer: Primary
17.In thin materials, the state of stress at crack tip is __________________
Answer: Two dimensional
18.Insufficient rigidity of surrounding structure may cause ____________________
Answer: Excessive deflections
19.Hi-Shear rivets are designed for _________________and __________________
Answer: Quick & Permanent installation
20.Fusion joint is made up of__________________
Answer: Heating weld zone to molten state