Q.1

A suitable material of construction to use with fuming sulphuric acid is

  • carbon steel
  • stainless steel type 304
  • nickel
  • monel
Q.2

Which of the following stainless steels is non-magnetic ?

  • Ferritic
  • Martensitic
  • Austenitic
  • None of these
Q.3

Galvanised iron is

  • harder
  • protected from rusting
  • alumina coated iron
  • none of these
Q.4

Cast iron has very high

  • compressive strength
  • ductility
  • shock resistance
  • resistance to brittleness
Q.5

Liquid ammonia is shipped in __________ containers.

  • steel
  • aluminium
  • glass
  • lead lined
Q.6

Presence of nickel in steel improves its

  • corrosion resistance.
  • cutting ability.
  • wear resistance.
  • all (a), (b) and (c).
Q.7

Cementite is

  • Fe3C chemically.
  • a compound of carbon and iron.
  • characterised by an orthorhombic crystal structure.
  • all (a), (b) and (c).
Q.8

__________ is never shipped in glass carboys.

  • Ammonia
  • Acetic acid
  • Phenol
  • Formaldehyde
Q.9

Which of the following alloys does not contain nickel ?

  • Chlorinet - 2 alloy
  • Monel
  • Inconel
  • Babbit metal
Q.10

The fermentor used for the production of ethyl alcohol from molasses is made of

  • wood
  • concrete
  • copper bearing steel
  • procelain
Q.11

Which one contains the least percentage of carbon ?

  • Wrought iron
  • High speed steel
  • Cast iron
  • Pig iron
Q.12

The range of Mho's scale of hardness is from

  • l to l5
  • l to 8
  • l to10
  • 0 to 10
Q.13

Percentage elongation of a material is a measure of its

  • ductility
  • brittleness
  • toughness
  • malleability
Q.14

The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.

  • 0.2
  • 2
  • 4
  • 8
Q.15

Hammers and railway rails are normally made of

  • mild steel
  • dead mild steel
  • medium carbon steel
  • high carbon steel
Q.16

Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.

  • chromium
  • nickel
  • tungsten
  • cobalt
Q.17

Constantan is an alloy of

  • Cu (55%) & Sn (45%).
  • Cu (55%) & Ni (45%).
  • Pt (95%) & Rh (10%).
  • Fe (80%) & Ni (20%).
Q.18

Coke oven regenerators are made of __________ bricks.

  • fire clay
  • silica
  • low thermal conductivity
  • high electrical conductivity
Q.19

Which of the following crystal structures characterises the austenitic stainless steel?

  • Simple hexagonal
  • Body centred cubic
  • Face centred cubic
  • None of these
Q.20

Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and

  • moving mercury and graphite.
  • graphite and moving mercury.
  • moving mercury and carbon.
  • moving mercury and crimped steel wire.
Q.21

18-4-1 high speed steel contains 18%,andrespectively of

  • tungsten, vanadium and chromium
  • tungsten, chromium and vanadium
  • vanadium, chromium and tungsten
  • chromium, tungsten and vanadium
Q.22

Aluminium as a material of construction suffers from the disadvantage of

  • very high cost.
  • rather low tensile strength.
  • very low strength to weight ratio.
  • scarce availability.
Q.23

German silver used for decorative purposes contains maximum percentage of

  • silver
  • copper
  • zinc
  • nickel
Q.24

The metals occuring at the lower most position in the electromotive series

  • do not resist corrosion.
  • resist corrosion very strongly.
  • are very brittle.
  • are heat insulators.
Q.25

Cermets are __________ materials.

  • refractory
  • reinforced
  • abrasive
  • fully metallic
Q.26

Acetylene gas holder is made of

  • copper
  • cast iron
  • steel
  • monel metal
Q.27

Lead is

  • not resistant to corrosion.
  • used as a cathodic material.
  • not used as pigment (in its compound forms) for paints.
  • used as a shock absorber (in mattress form) between the foundation and steel framework of skyscrapper buildings.
Q.28

Nitriding of steel is done (in electric furnace) at __________ °C.

  • 510
  • 1720
  • 2210
  • 910
Q.29

An elastic behaviour of materials is expressed in terms of

  • hysterisis loop area
  • stress-strain curve
  • relaxation time
  • none of these
Q.30

Super conductors are those substances, which

  • offer no resistance to current flow.
  • conduct electricity at low temperature.
  • offer high resistance to current flow.
  • conduct electricity at high temperature.
Q.31

Thermal shield used in high powered nuclear reactor to protect the walls of the reactor from radiation damage is made of

  • concrete
  • steel
  • zircalloy
  • graphite
Q.32

All materials obey Hooke's law within elastic limit. When elastic limit is reached, the tensile strain

  • increases very quickly.
  • decreases very quickly.
  • increases in proportion to stress.
  • decreases in proportion to stress.
Q.33

Which of the following pairs of elements may form an alloy ?

  • Iron & carbon
  • Iron & mercury
  • Platinum & mercury
  • None of these
Q.34

Chlorination of benzene is done to produce benzene hexachloride (a pesticide) in a photochemical reactor lined with

  • karbate
  • lead or glass
  • fireclay bricks
  • PVC
Q.35

Invar used in thermocouples is an alloy of nickel and

  • iron
  • copper
  • chromium
  • lead
Q.36

Nickel (56%) and molybdenum (17%) alloys are called

  • monel
  • hastealloy C
  • inconel
  • bronzes
Q.37

Softness of silver can be converted into hardness by alloying it with small quantity of

  • copper & nickel
  • zinc
  • aluminium
  • tin
Q.38

Fatigue strength of a material increases by

  • having notches in the specimen
  • rise in temperature
  • under stressing the specimen
  • having scratches on the surface
Q.39

Which of the following heat treatment processes is used for softening the hardened material ?

  • Normalising
  • Tempering
  • Annealing
  • None of these
Q.40

Steel tower used for the storage of oleum

  • is lined with lead.
  • need not be lined.
  • is lined with rubber.
  • is lined with acid-proof bricks.
Q.41

Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containingnickel and has very low co-efficient of expansion (l/20th of ordinary metals) ?

  • Invar
  • Constantan
  • Chromel
  • Alumel
Q.42

Addition of __________ in steel can help in increasing the depth of hardness.

  • nickel
  • chromium
  • vanadium
  • tungsten
Q.43

Babbit metal used for bearings is a____base alloy.

  • tin
  • lead
  • aluminium
  • copper
Q.44

Cast irons are generally specified by their

  • carbon content
  • tensile strength
  • hardness
  • manufacturing proces
Q.45

Addition ofnickel in steel makes it suitable for making

  • electronic valves
  • boiler plates, rivets etc.
  • turbine blades
  • connecting rod
Q.46

Pure nickel is

  • ferromagnetic above its curie point (i.e., 415°C).
  • having h.c.p. crystal lattice.
  • ferromagnetic at room temperature.
  • not resistant to oxidation at high temperature.
Q.47

Cermets are used for making

  • cutting tools
  • abrasives
  • both (a) & (b)
  • neither (a) nor (b)
Q.48

Silico-manganese steels (containing 0.Mn, 0.C andSi)

  • do not require heat treatment for any of its applications.
  • are used for leaf and coiled springs.
  • do not have good resilience properties.
  • is tempered at 850°C.
Q.49

Babbit metals used for making bearings are

  • tin or lead based alloys.
  • short of antifrictional properties.
  • having homogenous microstructure.
  • yellow metals.
Q.50

For storing water and acid free benzol, use a __________ vessel.

  • steel
  • karbate
  • stainless steel
  • none of these
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