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MCQs

Total Questions : 1977 | Page 197 of 198 pages
Question 1961. Silicon percentage in iron castings to have maximum hardness should be about
  1.    0.5
  2.    0.3
  3.    2.5
  4.    0.8
 Discuss Question
Answer: Option D. -> 0.8
Question 1962. Rotary driers are generally made of
  1.    Cast iron
  2.    Tin lined with refractory bricks
  3.    High silicon iron (14% Si)
  4.    Mild steel
 Discuss Question
Answer: Option D. -> Mild steel
Question 1963. Corrosion resisting properties of cast iron are significantly improved by the addition of 12 - 15% of
  1.    All of these
  2.    Vanadium
  3.    Silicon
  4.    Tungsten
 Discuss Question
Answer: Option C. -> Silicon
Question 1964. Heavy duty bearings are usually made of
  1.    Zinc
  2.    White metal
  3.    Monel
  4.    Phosphorous bronze
 Discuss Question
Answer: Option B. -> White metal
Question 1965. Which metal is protected by the layer of its own oxide?
  1.    Aluminium
  2.    Calcium
  3.    Silver
  4.    Iron
 Discuss Question
Answer: Option A. -> Aluminium
Question 1966. Light weight metallic alloy used in aircraft industry is
  1.    Duralumin
  2.    Phosphor bronze
  3.    High silicon (14%) iron
  4.    Aluminium
 Discuss Question
Answer: Option A. -> Duralumin
Question 1967. Zinc is not used
  1.    As an alloying element in various bronzes
  2.    As anode for corrosion prevention in boiler
  3.    In its oxide form as pigments
  4.    For producing zinc base die casting alloys
 Discuss Question
Answer: Option A. -> As an alloying element in various bronzes
Question 1968. Pick out the wrong statement?
  1.    The toughness of a material decreases, when it is heated
  2.    Crane hooks are normally made of wrought iron
  3.    Cold working of a metal decreases its fatigue strength
  4.    The temperature at which new grains are formed in a metal is known as the recrystallisation temperature
 Discuss Question
Answer: Option C. -> Cold working of a metal decreases its fatigue strength
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1969. Pick out the wrong statement?
  1.    Pure rubber is as useless as pure gold as a material of construction
  2.    Thermal conductivity of aluminium is higher than that of copper; hence it is increasingly used for utensil making
  3.    Copper has poor weldability
  4.    Reinforced plastics are made from both thermoplastic as well as thermosetting plastics
 Discuss Question
Answer: Option B. -> Thermal conductivity of aluminium is higher than that of copper; hence it is increasingly used for utensil making
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 1970. Pick out the correct statement?
  1.    Stainless steel is nothing but chromium coated steel
  2.    Hardening of a soft metal can be done by alloying it with another metal or non-metal
  3.    Plastic deformation of a material is its temporary distortion under the action of applied stress
  4.    Rusting of iron is not electrochemical in nature
 Discuss Question
Answer: Option B. -> Hardening of a soft metal can be done by alloying it with another metal or non-metal
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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