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Intensive reading
Translate the paragraph and
identify :
•the sentence ; active or passive
•the predicate / verb
•the noun phrases
•the part of speech in the text
Engineering Materials
Engineers have to know the best and
most economical materials to use.
Engineers must understand the
properties of these materials and how
they can be worked. There are two
kinds of material used in engineering
– metals and non metals.
We can divide metals into ferrous and
non ferrous metals. The former
contain iron and the letter do not
contain iron. Cast iron and steel,
which are both alloys, or mixture of
iron and carbon, are the two most
important ferrous metals. Steel
contains a smaller proportion of
carbon than cast iron contains.
Certain elements can improve the
properties of steel and are therefore
added to it. For example,
chromium may be included to
resist corrosion and tungsten to
increase hardness. Aluminum,
copper, and the alloys, bronze and
brass, are common non-ferrous
metals.
Plastics and ceramics are non metals,
however, plastics may be machined
like metals. Plastics are classified into
two types – thermoplastics and
thermosets. Thermoplastics can be
shaped and reshaped by heat and
pressure but thermosets cannot be
reshaped because they undergo
chemical changes as they harden.
Ceramics are often employed by
engineers when the materials which
can withstand high temperature are
needed.
ENGINEERING MATERIALS.pptx
ENGINEERING MATERIALS.pptx
ENGINEERING MATERIALS.pptx

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ENGINEERING MATERIALS.pptx

  • 1. Intensive reading Translate the paragraph and identify : •the sentence ; active or passive •the predicate / verb •the noun phrases •the part of speech in the text
  • 3. Engineers have to know the best and most economical materials to use. Engineers must understand the properties of these materials and how they can be worked. There are two kinds of material used in engineering – metals and non metals.
  • 4. We can divide metals into ferrous and non ferrous metals. The former contain iron and the letter do not contain iron. Cast iron and steel, which are both alloys, or mixture of iron and carbon, are the two most important ferrous metals. Steel contains a smaller proportion of carbon than cast iron contains.
  • 5. Certain elements can improve the properties of steel and are therefore added to it. For example, chromium may be included to resist corrosion and tungsten to increase hardness. Aluminum, copper, and the alloys, bronze and brass, are common non-ferrous metals.
  • 6. Plastics and ceramics are non metals, however, plastics may be machined like metals. Plastics are classified into two types – thermoplastics and thermosets. Thermoplastics can be shaped and reshaped by heat and pressure but thermosets cannot be reshaped because they undergo chemical changes as they harden. Ceramics are often employed by engineers when the materials which can withstand high temperature are needed.