Q.1
Which of the following metal is used in making electrical resistance wire for electric furnaces and heating elements?
Q.2
Which of the following element results in presence of free graphite in C.I.?
Q.3
The percentage carbon content in wrought iron is about
Q.4
In the lower part of the blast furnace (zone of fusion), the temperature is
Q.5
The heat treatment process used for softening hardened steel is
Q.6
Vanadium in high speed steels
Q.7
Age-hardening is related with
Q.8
Isotropic materials are those which have the same
Q.9
The material in which the atoms are arranged chaotically, is called
Q.10
Tungsten when added to steel __________ the critical temperature.
Q.11
Which of the following impurity in cast iron makes it hard and brittle?
Q.12
An engineer's hammer is made of
Q.13
Basic solution is one which has pH value
Q.14
Neutral solution is one which has pH value
Q.15
Acidic solution is one which has pH value
Q.16
Inconel contains
Q.17
The presence of sulphur in pig iron makes
Q.18
Which of the following represents the allotropic forms of iron?
Q.19
The addition of which of the following improves machining of copper?
Q.20
The toughness of a material __________ when it is heated.
Q.21
There are fourteen atoms in a unit cell of
Q.22
Which is false statement about properties of aluminium?
Q.23
Cartridge brass can be
Q.24
When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces
Q.25
Iron is
Q.26
Corundum contains more than 95%
Q.27
For a steel containing 0.8% carbon
Q.28
The machinability of steel is increased by
Q.29
The hardness is the property of a material due to which it
Q.30
Smelting is the process of
Q.31
Induction hardening is the process of
Q.32
Age hardening is related to
Q.33
White cast iron has
Q.34
When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.
Q.35
The ratio of the volume occupied by the atoms to the total volume of the unit cell is called
Q.36
Cyaniding is the process of
Q.37
Stress relaxation is the phenomenon
Q.38
In nodular iron, graphite is in the form of
Q.39
Malleable cast iron
Q.40
Bell metal contains
Q.41
Which is false statement about normalizing? Normalizing is done to
Q.42
The percentage of carbon in grey iron castings usually varies between
Q.43
Dye penetrant method is generally used to locate
Q.44
Chilled cast iron has
Q.45
The aluminium alloy, mainly used, for anodized utensil manufacture, is
Q.46
The material widely used for making pendulums of clocks is
Q.47
Taps dies and drills contain carbon
Q.48
Solder is an alloy consisting of
Q.49

Free carbon in iron makes the metal

  • soft and gives a coarse grained crystalline structure
  • soft and gives a fine grained crystalline structure
  • hard and gives a coarse grained crystalline structure
  • hard and gives a fine grained crystalline structure
Q.50

The cutting tools are made from

  • nickel steel
  • chrome steel
  • nickel-chrome steel
  • high speed steel
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