Q.1

Which of the following is a case hardening process?

  • Carburising
  • Cyaniding
  • Nitriding
  • all of these
Q.2

The process of inducing carbon to __________ carbon steels in order to give it a hard surface is known as carburising.

  • low
  • medium
  • high
Q.3

Which of the following solids are malleable and ductile?

  • Ionic solids
  • Covalent solids
  • Metallic solids
  • none of these
Q.4

The approximate height of a blast furnace is

  • 10 m
  • 20 m
  • 30 m
  • 40 m
Q.5

Inconel contains

  • 65% nickel, 15% chromium and 20% iron
  • 68% nickel, 29% copper and 3% other constituents
  • 80% nickel and 20% chromium
  • 80% nickel, 14% chromium and 6% iron
Q.6

The iron ore mostly used for the production of pig iron is

  • magnetite
  • haematite
  • limonite
  • siderite
Q.7

Babbit metal is a

  • lead-base alloy
  • copper-base alloy
  • tin-base alloy
  • cadmium-base alloy
Q.8

Pearlite is a combination offerrite andcementite.

  • Yes
  • No
Q.9

Eutectoid reaction occurs at

  • 600°C
  • 723°C
  • 1147°C
  • 1493°C
Q.10

Corrosion resistance of steel is increased by adding nickel and chromium.

  • Agree
  • Disagree
Q.11

Sulphur in cast iron

  • makes the iron soft and easily machinable
  • increases hardness and brittleness
  • makes the iron white and hard
  • aids fusibility and fluidity
Q.12

Gamma-iron occurs between the temperature range of

  • 400°C to 600°C
  • 600°C to 900°C
  • 900°C to 1400°C
  • 1400°C to 1530°C
Q.13

Body centred cubic space lattice is found in

  • zinc, magnesinm, cobalt, cadmium, antimony and bismuth
  • gamma-iron, aluminium, copper, lead, silver and nickel
  • alpha-iron, tungsten, chromium and molybdenum
  • none of the above
Q.14

German silver contains

  • 1% silver
  • 2% silver
  • 5% silver
  • no silver
Q.15

In a crystalline material, atoms are arranged in definite and orderly manner and form.

  • Agree
  • Disagree
Q.16

The delta-iron possesses a body centred cubic space lattice.

  • Correct
  • Incorrect
Q.17

A steel alloy containingnickel is called

  • stainless steel
  • high speed steel
  • invar
  • heat resisting steel
Q.18

In a hardening process, the hypo-eutectoid steel is

  • heated from 30° C to 50° C above the upper critical temperature and then cooled in still air
  • heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
  • heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace
  • heated below or close to the lower critical temperature and then cooled slowly
Q.19

A carbon steel having Brinell hardness numbershould have ultimate tensile strength closer to

  • 100 N/mm2
  • 200 N/mm2
  • 350 N/mm2
  • 1000 N/mm2
Q.20

The metal suitable for bearings subjected to heavy loads, is

  • silicon bronze
  • white metal
  • monel metal
  • phosphor bronze
Q.21

The percentage carbon content in wrought iron is about

  • 0.02
  • 0.1
  • 02
  • 0.4
Q.22

The addition of copper to aluminium possesses maximum strength after heat treatment and age-hardening

  • Correct
  • Incorrect
Q.23

The silicon steel is widely used for

  • connecting rods
  • cutting tools
  • generators and transformers in the form of laminated cores
  • motor car crankshafts
Q.24

Cementite consist of

  • 13% carbon and 87% ferrite
  • 13% cementite and 87% ferrite
  • 13% ferrite and 87% cementite
  • 6.67% carbon and 93.33% iron
Q.25

Connecting rod is, usually, made from

  • low carbon steel
  • high carbon steel
  • medium carbon steel
  • high speed steel
Q.26

The maximum solubility of carbon in austenite is 1.atC.

  • Yes
  • No
Q.27

The austenitic stainless steel contains

  • 18% chromium and 8% nickel
  • 8% chromium and 18% nickel
  • 14% chromium and 0.35% carbon
  • 14% nickel and 0.35% carbon
Q.28

Thermosetting plastics are those materials which

  • are formed into shape under heat and pressure and results in a permanently hard product
  • do not become hard with the application of heat and pressure and no chemical change occurs
  • are flexible and can withstand considerable wear under suitable conditions
  • are used as a friction lining for clutches and brakes
Q.29

The addition of manganese to aluminium improves corrosion resistance.

  • Correct
  • Incorrect
Q.30

The steel widely used for making precision measuring instruments is

  • nickel steel
  • nickel-chrome steel
  • high speed steel
  • chrome-vanadium steel
Q.31

Nickel when added to copper improves

  • machinability
  • hardness
  • hardness and strength
  • strength and ductility
Q.32

Ball bearings are, usually, made from

  • low carbon steel
  • high carbon steel
  • medium carbon steel
  • chrome steel
Q.33

Which of the following inpurity in cast iron makes it hard and brittle?

  • Silicon
  • Sulphur
  • Manganese
  • Phosphorus
Q.34

In a close packed hexagonal space lattice, there are

  • nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre
  • twelve atoms, all of which are located at the twelve corners of a hexagonal prism
  • fourteen atoms out of which eight atoms are located at the coners of the cube and six atoms at the centres of six faces
  • none of the above
Q.35

The process used for relieving the internal stresses previously set up in the Metal and for increasing the machinability of steel, is

  • normalising
  • full annealing
  • process annealing
  • spheroidising
Q.36

The temperature point at which the change ends on heating the steel is called

  • lower critical point
  • upper critical point
  • point of recalescence
  • point of decalescence
Q.37

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

  • can be drawn into wires
  • breaks with little permanent distortion
  • can be rolled or hammered into thin sheets
  • can resist fracture due to high impact loads
Q.38

Steel containing upto 0.carbon, is known as

  • mild steel
  • dead mild steel
  • medium carbon steel
  • high carbon steel
0 h : 0 m : 1 s