Aluminium and its Alloys, Zinc and its Alloys MCQ

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• What is the temperature at which zinc become malleable
  ক

  <100 oC

  খ

  100-150 oC

  গ

  >210 oC

  ঘ

  419 oC
• What is the appearance of zinc?
  ক

  Bluish-grey

  খ

  Red

  গ

  Yellow

  ঘ

  Green
• The most common casting process for zinc alloys is _______
  ক

  Sand casting

  খ

  Die casting

  গ

  Investment casting

  ঘ

  Centrifugal casting
• With the addition of which element, does zinc create resistance to creep?
  ক

  Pb

  খ

  Cd

  গ

  Mg

  ঘ

  Cu
• What is the melting point of zinc?
  ক

  419oC

  খ

  600oC

  গ

  907oC

  ঘ

  950oC
• How much copper is present in Y-alloys?
  ক

  4%

  খ

  2%

  গ

  1.5%

  ঘ

  1%
• Which of these is not a stage in precipitation hardening treatment?
  ক

  Solution treatment

  খ

  Tempering

  গ

  Quenching

  ঘ

  Ageing
• What happens when the maximum strength is achieved by the aging process?
  ক

  Precipitate hardening

  খ

  Age hardening

  গ

  Over-aging

  ঘ

  Natural ageing
• Artificial aging process takes place at a temperature range of ________
  ক

  190-260oC

  খ

  260-300oC

  গ

  300-350oC

  ঘ

  Room temperature
• Which among the following is an example of a non heat-treatable alloy?
  ক

  Al-Cu

  খ

  Al-Li

  গ

  Al-Mg-Si

  ঘ

  Al-Mn
• Which of these is not a property of duralumin?
  ক

  High strength

  খ

  1/3 the weight of steel

  গ

  Excellent casting and forging abilities

  ঘ

  Poor machinability
• Which aluminum alloy is known as aircraft aluminum?
  ক

  6061

  খ

  6063

  গ

  7068

  ঘ

  7075
• _______ is coated onto aluminum to improve its soldering ability.
  ক

  Magnesium

  খ

  Lithium

  গ

  Tin

  ঘ

  Copper
• Compared to copper, how is the electrical conductivity of aluminum?
  ক

  Higher

  খ

  Lower

  গ

  Equal

  ঘ

  Zero
• What is the tensile strength of aluminum?
  ক

  122.5 GPa

  খ

  220 MPa

  গ

  70.5 GPa

  ঘ

  45 MPa
• What is the melting point of pure aluminum?
  ক

  520-600oC

  খ

  600oC

  গ

  800oC

  ঘ

  950oC