Q.1

The quenching of steel from the upper critical point results in a fine grained structure.

  • Agree
  • Disagree
Q.2

Nodular cast iron is produced by adding __________ to the molten cast iron.

  • nickel
  • chromium
  • copper
  • magnesium
Q.3

Normalising of steel is done to

  • refine the grain structure
  • remove strains caused by cold working
  • remove dislocations caused in the internal structuure due to hot working
  • all of the above
Q.4

Age hardening is related to

  • duralumin
  • brass
  • copper
  • silver
Q.5

The addition of which of the following improves machining of copper?

  • Sulphur
  • Vanadium
  • Tin
  • Zinc
Q.6

According to Indian standard specifications, SG 400/means

  • spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa
  • spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation
  • spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area
  • none of the above
Q.7

The acidic bessemer process is suitable for producing steel from pig iron containing large quantities of phosphorus.

  • Correct
  • Incorrect
Q.8

The charge of the blast furnace consists of

  • calcined ore (8 parts ), coke (4 parts) and limestone (1 part)
  • calcined ore (4 parts), coke (1 part) and limestone (8 parts)
  • calcined ore (1 part), coke (8 part) and limestone (4 parts)
  • calcined ore, coke and limestone all in equal parts
Q.9

Brass is an alloy of

  • copper and zinc
  • copper and tin
  • copper, tin and zinc
  • none of these
Q.10

Silicon when added to copper improves

  • machinability
  • hardness
  • hardness and strength
  • strength and ductility
Q.11

The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is

  • chromium
  • nickel
  • vanadium
  • cobalt
Q.12

The hardness of steel increases if it contains

  • pearlite
  • ferrite
  • cementite
  • martensite
Q.13

An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and

  • chromium
  • silicon
  • manganese
  • magnesium
Q.14

Cast iron is a

  • ductile material
  • malleable material
  • brittle material
  • tough material
Q.15

The coke in the charge of blast furnace

  • controls the grade of pig iron
  • acts as an iron-bearing mineral
  • supplies heat to reduce ore and melt the iron
  • forms a slag by combining with impurities
Q.16

A steel containingtochromium and 0.to 0.carbon is called martensitic stainless steel.

  • True
  • False
Q.17

When a steel containing __________ 0.carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.

  • equal to
  • less than
  • more than
Q.18

Dye penetrant method is generally used to locate

  • core defects
  • surface defects
  • superficial defects
  • temporary defects
Q.19

When a medium carbon steel is heated to coarsening temperature,

  • there is no change in grain size
  • the average grain size is a minimum
  • the grain size increases very rapidly
  • the grain size first increases and then decreases very rapidly
Q.20

White cast iron has

  • carbon in the form of carbide
  • low tensile strength
  • high compressive strength
  • all of these
Q.21

In low carbon steels, presence of small quantities of sulphur improves

  • weldability
  • formability
  • machinability
  • hardenability
Q.22

The ability of a material to resist fracture due to high impact loads, is called

  • strength
  • stiffness
  • toughness
  • brittleness
Q.23

A material is said to be allotropic, if it has

  • fixed structure at all temperatures
  • atoms distributed in random pattern
  • different crystal structures at different temperatures
  • any one of the above
Q.24

Cast iron is manufactured in

  • blast furnace
  • cupola
  • open hearth furnace
  • bessemer converter
Q.25

In full annealing, the hypo-eutectoid steel is heated fromC toC above the upper critical temperature and then cooled

  • in still air
  • slowly in the furnace
  • suddenly in a suitable cooling medium
  • any one of these
Q.26

Which of the following has a fine gold colour and is used for imitation jewellery?

  • Silicon bronze
  • Aluminium bronze
  • Gun metal
  • Babbit metal
Q.27

Haematite iron ore contains iron about

  • 30%
  • 45%
  • 55%
  • 70%
Q.28

The aluminium alloy, mainly used, for anodized utensil manufacture, is

  • duralumin
  • Y-alloy
  • magnalium
  • hindalium
Q.29

The property of a material essential for spring materials is

  • stiffness
  • ductility
  • resilience
  • plasticity
Q.30

The material widely used for making pendulums of clocks is

  • stainless steel
  • high speed steel
  • heat resisting steel
  • nickel steel
Q.31

The cupola is used to manufacture

  • pig iron
  • cast iron
  • wrought iron
  • steel
Q.32

The type of space lattice found in gamma-iron is

  • face centred cubic space lattice
  • body centred cubic space lattice
  • close packed hexagonal space lattice
  • none of these
Q.33

Which of the following display properties similar to that of steel?

  • Blackheart cast iron
  • Whiteheart cast iron
  • both (a) and (b)
  • none of these
Q.34

The hardness is the property of a material due to which it

  • can be drawn into wires
  • breaks with little permanent distortion
  • can cut another metal
  • can be rolled or hammered into thin sheets
Q.35

Nimonic contains __________ percentage of nickel as that of Inconel.

  • same
  • less
  • more
Q.36

The charge is fed into the blast furnace through the

  • stack
  • throat
  • bosh
  • tuyers
Q.37

Phosphorus is added in low carbon steels to raise its yield point.

  • True
  • False
Q.38

Iron-carbon alloys containing carbon __________ 4.are known as hyper-eutectic cast irons.

  • equal to
  • less than
  • more than
Q.39

Cast iron is used in those parts which are subjected to shocks.

  • Correct
  • Incorrect
Q.40

The purpose of heat treatment is to

  • relieve the stresses set up in the material after hot or cold working
  • modify the structure of the material
  • change grain size
  • any one of these
Q.41

Closed packed hexagonal space lattice is found in

  • zinc, magnesium, cobalt, cadmium, antimony and bismuth
  • gamma-iron, aluminium, copper, lead, silver and nickel
  • alpha-iron, tungsten, chromium and molybdenum
  • none of the above
Q.42

The lower critical point for all steels is

  • 600°C
  • 700°C
  • 723°C
  • 913°C
Q.43

Ferrite and pearlite makes the steel soft and ductile.

  • Agree
  • Disagree
Q.44

When the steel is normalised, its

  • yield point increases
  • ductility decreases
  • ultimate tensile strength increases
  • all of these
Q.45

The material in which the atoms are arranged regularly in some directions but not in others, is called

  • amorphous material
  • mesomorphous material
  • crystalline material
  • none of these
Q.46

The toughness of a material __________ when it is heated.

  • remains same
  • decreases
  • increases
Q.47

A steel with carbon above 0.is known as hyper-eutectoid steel.

  • Agree
  • Disagree
Q.48

The stiffness is the ability of a material to resist

  • deformation under stress
  • fracture due to high impact loads
  • externally applied forces with breakdown or yielding
  • none of the above
Q.49

The property of a material due to which it breaks with little permanent distortion, is called

  • brittleness
  • ductility
  • malleability
  • plasticity
Q.50

Hindalium is an alloy of aluminium and magnesium with a small quantity of chromium.

  • Agree
  • Disagree
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