Aircraft Materials MCQ

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• The fatigue limit of steel is around ____ times the ultimate tensile strength.
  ক

  0.3

  খ

  5

  গ

  3

  ঘ

  0.5
• The fatigue limit of a specimen is ___________ of its fatigue range.
  ক

  triple

  খ

  double

  গ

  half

  ঘ

  exactly the same
• Materials that have been subjected to heat treatment generally have lower tensile strengths than materials that are annealed.
  ক

  True

  খ

  False
• Corrosion of materials results in ___________ of fatigue limit.
  ক

  reduction

  খ

  increment

  গ

  double

  ঘ

  satisfaction
• The specimen of fatigue testing must not have ___________
  ক

  Uniform cross-section

  খ

  Metal

  গ

  Certain colours

  ঘ

  Notches and holes
• What is the diameter of a typical specimen used in fatigue testing?
  ক

  2000 inches

  খ

  0.0005 inches

  গ

  1 inch

  ঘ

  26 inches
• What is the typical speed of rotation in a normal speed fatigue testing machine?
  ক

  2000 rpm

  খ

  20 rpm

  গ

  26,000 rpm

  ঘ

  14,000 rpm
• The amount of test cycles required to find out the fatigue stress of hard aluminium alloys is ____________
  ক

  64,000,900,000

  খ

  500,000,000

  গ

  3000

  ঘ

  27
• Which of the following is a fatigue-testing apparatus?
  ক

  Rotating-beam tests

  খ

  Load test

  গ

  Fixed load test

  ঘ

  Rotating wing test
• The amount of test cycles required to find out the fatigue stress of hard steels is ___________
  ক

  10,000,000

  খ

  2600

  গ

  26

  ঘ

  2,000,000
• Testing a material to know it’s fatigue strength is very easy.
  ক

  True

  খ

  False
• What is fatigue stress?
  ক

  The stress endured by an observer

  খ

  Stress divided by strain and multiplied by conductivity

  গ

  The amount of stress, a material can tolerate repeatedly without failure

  ঘ

  The stress endured perpendicular to the observer
• Torsional strength is the _________
  ক

  capacity of a material to withstand the twisting load

  খ

  ability to apply force

  গ

  gravitational attraction

  ঘ

  electrical force
• If a wire that has a diameter of less than 0.033 inches has to undergo a torsion test, the length of the specimen being used must be _________ inches.
  ক

  10

  খ

  100

  গ

  30

  ঘ

  8
• The wire constantly experiences kinking when it is subjected to the torsion test.
  ক

  True

  খ

  False
• What is the maximum speed up to which the clamp can be rotated in a torsion test?
  ক

  120rpm

  খ

  2rpm

  গ

  -26rpm

  ঘ

  60rpm
• In the torsion test, there are two clamps. The clamps are _________
  ক

  both fixed

  খ

  one fixed one rotating

  গ

  both rotating

  ঘ

  both joined permanently
• The setup of a torsion test involves two clamps having a distance of _________ inches between them.
  ক

  10

  খ

  18

  গ

  26

  ঘ

  8
• In a torsion test, if the wire that has to be tested has a diameter of more than 0.333 inches, the specimen needs to have a minimum length of ________ inches.
  ক

  10

  খ

  33

  গ

  0.0966

  ঘ

  26
• “Torsion” is defined as _________
  ক

  compressive force

  খ

  type of friction

  গ

  twisting

  ঘ

  object at rest
• It is a requirement for a ___________ to undergo the torsion test.
  ক

  sheet

  খ

  wire

  গ

  steel plate

  ঘ

  wood
• Which of the following affects a Charpy test?
  ক

  Specimen gauges factor

  খ

  Test machine frequency

  গ

  Colour

  ঘ

  Yield strength
• The swing of a pendulum/hammer decreases after it comes in contact with the specimen in a Charpy test.
  ক

  True

  খ

  False
• The final impact value is obtained by dividing the _________ by the cross-sectional area in the Charpy test.
  ক

  heat of the specimen

  খ

  cross-sectional damage

  গ

  energy of fracture

  ঘ

  cross-sectional area
• The Charpy impact test does not require a pendulum/hammer.
  ক

  True

  খ

  False
• In the Charpy test, the notch faces _________ from the pendulum.
  ক

  towards

  খ

  20m

  গ

  away

  ঘ

  around
• The Charpy test, which is a type of impact test measures the __________ absorbed by a specimen.
  ক

  heat

  খ

  energy

  গ

  length

  ঘ

  breadth
• In the Charpy test, the tensile specimen being tested is ___________ on both sides.
  ক

  threaded

  খ

  axed

  গ

  flattened

  ঘ

  heated
• Which of the following impact test method is preferred these days?
  ক

  Impact test

  খ

  Reverse bend test

  গ

  Flattening test

  ঘ

  Charpy test
• Which of the following are standard impact tests?
  ক

  Izod test and flattening test

  খ

  Izod test and Charpy test

  গ

  Flattening test and reverse bend

  ঘ

  Charpy test and reverse bend test