Q.1

Bronze is an alloy of copper and

  • lead
  • tin
  • nickel
  • zinc
Q.2

Brinell Hardness Number (BHN) for talc is approximately in the range of

  • 1-5
  • 20-30
  • 100 -150
  • 200 - 250
Q.3

Water gas generator is made of

  • carbon steel-brick lined
  • stainless steel-lead lined
  • cast iron
  • high carbon steel-procelain lined
Q.4

The digester of a Gobar gas plant is a

  • mild steel drum
  • stainless steel vessel
  • masonry well
  • cast iron vessel
Q.5

For handling sulphuric acid ofstrength, the suitable material of construction for pipes is

  • stainless steel
  • cast iron
  • aluminium
  • nickel
Q.6

__________ alloys have the highest specific strength of all the structural materials out of the following.

  • Magnetic steel
  • Titanium
  • Chromium
  • Magnesium
Q.7

Caustic soda can be stored in __________ drums.

  • steel
  • cast iron
  • brass
  • gun metal
Q.8

Thermosetting resins are those polymers, which

  • do not increase in plasticity with rise in temperature.
  • allow slip to occur between molecules.
  • do not take on a permanent set.
  • none of these.
Q.9

Cold worked steel parts are normally subjected to

  • normalising
  • hardening
  • annealing
  • shot peening
Q.10

A material no longer behaves elastically beyond

  • plastic limit
  • limiting load
  • elastic limit
  • breaking load
Q.11

Constantan used in thermocouples is an alloy of

  • iron & copper
  • copper & aluminium
  • lead & tin
  • none of these
Q.12

Which of the following is not a nickel based alloy ?

  • Inconel
  • Hastelloys
  • Nimonics
  • Babbit metal
Q.13

Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its

  • high strength to weight ratio.
  • low temperature strength properties.
  • its ability to be cast, rolled, forged & stamped.
  • high strength and corrosion & oxidation-resistance at elevated temperature.
Q.14

Concentrated HCl at 30°C can be stored in a vessel made of

  • PTFE and porcelain.
  • cast iron and aluminium.
  • stainless steel and high silicon cast iron.
  • none of these.
Q.15

Which of the following stainless steels is non-magnetic ?

  • Ferritic
  • Martensitic
  • Austenitic
  • None of these
Q.16

Acid proof stoneware

  • has very low strength.
  • cannot be heated.
  • is broken by small temperature changes.
  • all (a), (b) and (c).
Q.17

Which of the following has the poorest wel-dability ?

  • Low carbon steel
  • Mild steel
  • Wrought iron
  • High-carbon steel
Q.18

Steel balls for ball bearings are generally made of __________ steel.

  • cast
  • stainless
  • free carbon
  • carbon chrome
Q.19

Which of the following exercises most powerful influence on the mechanical properties of steel ?

  • Manganese
  • Carbon
  • Phosphorous
  • Silicon
Q.20

Dies for wire drawing are generally made of

  • mild steel
  • stainless steel
  • carbides
  • high carbon steel
Q.21

The ability of a material to offer resistance to scratching or indentation is a measure of its

  • brittleness
  • toughness
  • hardness
  • resilience
Q.22

Cast iron has

  • high ductility.
  • high malleability.
  • very high tensile strength.
  • its elastic limit very close to ultimate breaking strength.
Q.23

H2SO4 at 30°C can't be stored in a vessel made/lined with

  • cast iron and high silicon iron.
  • mild steel and stainless steel.
  • aluminium, tin and rubber.
  • teflon, glass and porcelain.
Q.24

Work hardening of a material

  • decreases its tensile strength.
  • decreases its ductility.
  • increases its ductility.
  • does not affect its ductility.
Q.25

When the steel is subjected to normalising, its __________ decreases.

  • yield point
  • ductility
  • ultimate tensile strength (UTS)
  • none of these
Q.26

Babbit metal (used for making bearings) comprises of

  • mainly tin (85%) and lead.
  • saw dust and iron dust mixture.
  • zinc and aluminium.
  • copper and aluminium.
Q.27

Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about

  • half
  • one third
  • one fifth
  • one twelfth
Q.28

Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower

  • price.
  • corrosion resistance.
  • thermal conductivity.
  • abundant availability.
Q.29

A material is able to retain the deformation permanently by virtue of its

  • elasticity
  • plasticity
  • ductility
  • malleability
Q.30

__________ steel is widely used for the manufacture of motor car crankshafts.

  • Silicon
  • Nickel
  • Chrome
  • High speed
Q.31

Visco-elastic behaviour of materials which is time dependent is common in

  • plastics
  • crystalline solid
  • non-crystalline solids
  • non-crystalline organic polymer
Q.32

Coke oven walls are lined with __________ bricks.

  • silica
  • tar-dolomite
  • low thermal conductivity
  • fire clay
Q.33

Babbit metal used for making bearings should have

  • high-co-efficient of friction between journal and bearing.
  • ability to retain lubricant on its surface.
  • low co-efficient of friction between journal and bearing.
  • both(b) & (c).
Q.34

A magnetic material becomes __________ above the Curie temperature.

  • ferromagnetic
  • diamagnetic
  • paramagnetic
  • none of these
Q.35

Diamagnetic materials are magnetised

  • strongly.
  • only slightly.
  • with eddy currents only.
  • in a direction opposite to that of the applied field.
Q.36

Creep is not exhibited at low temperature by

  • rubber
  • acrylics
  • lead
  • plastics
Q.37

Nickel and molybdenum are the basic constituents of

  • hastealloy
  • German silver
  • inconel
  • solder
Q.38

Beehive coke ovens are made of __________ bricks.

  • silica
  • fireclay
  • silicon carbide
  • corundum
Q.39

Percentage of silver in German silver is

  • 5
  • 10
  • 20
  • 0
Q.40

Balls in a ball mill are usually made of

  • steel
  • cast iron
  • stainless steel
  • bronze
Q.41

Dip stick used for measuring the level of petro fuels (e.g. petrol, diesel, fuel oil etc.) in the storage tank is usually made of

  • brass
  • copper
  • high carbon steel
  • aluminium
Q.42

Brine (concentration) can be stored in a vessel made of

  • monel
  • karbate
  • cast iron
  • none of these
Q.43

Which of the following is not an alloy of tin?

  • White-bearing metal
  • Pewter type metal
  • Soft solder
  • German silver
Q.44

Carbon content in plain carbon steel is __________ percent.

  • 0.1 to 0.15
  • 0.35 to 0.45
  • 0.65 to 0.80
  • 0.85 to 1.2
Q.45

Duralumin is an alloy of

  • aluminium, copper and manganese.
  • aluminium, nickel and silicon.
  • aluminium and nickel.
  • none of these.
Q.46

The most commonly used resin for making reinforced plastic is

  • unsaturated polyester
  • polypropylene
  • polyurathane
  • nylon-6
Q.47

Most suitable material for high pressure vessel operating atatm. andC is

  • molybdenum stainless steel.
  • 18/8 stainless steel.
  • mild steel.
  • high silicon iron (14% Si).
Q.48

Hydrochloric acid is stored in a __________ steel vessel.

  • lead lined
  • rubber lined
  • glass lined
  • stainless
Q.49

Chrome vanadium steels usually contain 0.8 to 1.Cr, 0.to 0.C and < 0.V. It is

  • used for making axle & shafts of aeroplanes, automobiles and locomotives.
  • having poor fatigue resistance.
  • having poor toughness.
  • not helpful in producing cleaner steel due to oxidising action of vanadium.
Q.50

Ball bearings are generally made of

  • plain carbon steel
  • chrome carbon steel
  • stainless steel
  • malleable cast iron
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