Q.1

The material of construction of pressure mills used for squeezing out the juice from sugar cane is

  • stainless steel
  • cast iron
  • mild steel
  • monel
Q.2

__________ is used for examining the macro-structure of a material.

  • Metallurgical microscope
  • Optical microscope
  • X-rays
  • Visual inspection by naked eye
Q.3

Out of the following, copper vessels are the most suitable for the storage of

  • bromine.
  • dry chlorine & dry fluorine.
  • nitric acid (95% and fuming).
  • phosphoric acid (95%) & sulphuric acid (95% and fuming).
Q.4

Pick out the wrong statement.

  • Metal/alloys having hexagonal crystal lattice structure are less malleable than those having cubic crystal lattice structure.
  • Metal/alloys having body centred cubic (bcc) crystal lattice structure is stronger & less ductile than those having face centred cubic (fcc) crystal lattice structure.
  • Tungsten has a body centred cubic (bcc) crystal lattice structure.
  • Both ferritic & austenitic stainless steel has a face centred cubic (fcc) crystal structure.
Q.5

Ability of a material to absorb energy in deformation in the plastic range is characterised as its

  • ductility
  • toughness
  • creep
  • resilience
Q.6

Silicon percentage in iron castings to have maximum hardness should be about

  • 0.3
  • 0.5
  • 0.8
  • 2.5
Q.7

Corrosion resisting properties of cast iron are significantly improved by the addition of-of

  • tungsten
  • vanadium
  • silicon
  • all (a), (b) & (c)
Q.8

Muntz metal is a/an alloys of

  • magnesium & tin
  • ferrous material
  • lead & tin
  • copper & zinc
Q.9

Which of the following is a low melting point metal ?

  • Stainless steel
  • Wrought iron
  • Tin
  • Copper
Q.10

Monel alloy is

  • the costliest of all the alloys of nickel.
  • not suitable for making kitchen utensils.
  • used for making steam valves and turbine blades as it resists steam attack at high temperature.
  • not used in cast and wrought forms.
Q.11

Nickel as a material of construction

  • is used as an alloying element for both ferrous & non-ferrous alloys.
  • is paramagnetic below 415° C (its Curie temperature).
  • dimagnetic.
  • has a body centred cubic (bcc) crystal lattice structure.
Q.12

Pick out the wrong statement

  • Hardening makes the steel more brittle.
  • High alloy steels contain more than 50% alloying element.
  • 18/8 stainless steel is a magnetic steel.
  • both (b) and (c)
Q.13

Rotary kilns in cement industry are lined with____bricks.

  • fireclay
  • silica
  • lead
  • high alumina & high magnesia
Q.14

Trough of an apron conveyor is made of

  • lead lined concrete vessel
  • wood
  • metal
  • either (b) or (c)
Q.15

Pick out the wrong statement.

  • The toughness of a material decreases, when it is heated.
  • Crane hooks are normally made of wrought iron.
  • Cold working of a metal decreases its fatigue strength.
  • The temperature at which new grains are formed in a metal is known as the recrystallisation temperature.
Q.16

Tin coating on metals is not done by

  • spraying
  • powder metallurgy
  • hot dipping
  • electro-deposition
Q.17

Amount of energy that a material can absorb before its fracture is a measure of its

  • toughness
  • resilience
  • malleability
  • ductility
Q.18

Molybdenum steels containing 0.to 0.molybdenum

  • are prone to temper brittleness.
  • are used for automobile parts like gears, axle, shaft, bearings etc.
  • have very poor fatigue resistance.
  • do not contain nickel or chromium or both.
Q.19

Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the __________ stress.

  • ultimate
  • yield point
  • proof
  • none of these
Q.20

Carbon is present in the combined form (carbide) in case of

  • pig iron
  • steel
  • ferroalloys
  • all (a), (b) & (c)
Q.21

__________ moulding process can not be used for thermoplastic plastics.

  • Compression
  • Extrusion
  • Injection
  • None of these
Q.22

Duriron is

  • acid resistant, brittle and very hard.
  • high silicon iron.
  • prone to breakage due to thermal expansion because of its very high co-efficient of thermal expansion.
  • all (a), (b) and (c).
Q.23

Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is __________ percent.

  • 0.02
  • 0.2
  • 0.35
  • 0.5
Q.24

Which of the following finds the least commercial use ?

  • Pure iron
  • High silicon iron
  • Low carbon steel
  • High carbon steel
Q.25

Which of the following is the most widely used insulating material for steam carray-ing pipelines ?

  • Ceramic fibre blanket
  • Glass wool and 85% magnesia
  • Vermiculite
  • Slag wool
Q.26

Gun metal is an alloy of

  • nickel, tin and copper
  • copper, tin and zinc
  • copper, phosphorus and nickel
  • manganese, phosphorus and nickel
Q.27

The softest material just next to talc in the Mho's scale is

  • quartz
  • gypsum
  • feldspar
  • fluorite
Q.28

18/8 stainless steel means, that it contains

  • 18% chromium and 8% nickel.
  • 18% chromium and 8% molybdenum.
  • 18% nickel and 8% chromium.
  • 18% molybdenum and 8% chromium.
Q.29

Anodic material used for the cathodic protection of underground buried steel pipeline is

  • nickel or copper
  • zinc or magnesium
  • bronze
  • brass
Q.30

Bush bearings are made of

  • mild steel
  • phosphorous bronze
  • white metal alloys
  • none of these
Q.31

Kel-F is a material, which is

  • chemically known as polychlorotrifluor-oethylene (PTFE).
  • having excellent chemical & high temperature resistance (upto 200°C).
  • having elastomeric properties.
  • all (a), (b) and (c).
Q.32

Which of the following is the hardest material ?

  • Topaz
  • Quartz
  • Corrundum
  • Flourite
Q.33

Chilled iron castings are

  • easily machinable
  • soft on surface
  • highly wear resistant
  • none of these
Q.34

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

  • Face centred cubic
  • Body centred cubic
  • Simple hexagonal
  • None of these
Q.35

'Semi steel' is

  • produced by adding 10-20% steel to the cupola charge.
  • stronger than cast iron.
  • both (a) and (b).
  • neither (a) nor (b).
Q.36

Pick out the correct statement.

  • Stainless steel is nothing but chromium coated steel.
  • Hardening of a soft metal can be done by alloying it with another metal or non-metal.
  • Plastic deformation of a material is its temporary distortion under the action of applied stress.
  • Rusting of iron is not electrochemical in nature.
Q.37

Which of the following will have the highest melting point ?

  • Pig iron
  • Mild steel
  • Wrought iron
  • High carbon steel
Q.38

Graphite is a good

  • thermal & electrical insulator.
  • conductor of heat.
  • conductor of electricity.
  • both (b) & (c).
Q.39

Phenol is not shipped in

  • nickel lined steel tank cars.
  • galvanised or tin lined drums.
  • boxed glass carboys.
  • cast iron containers.
Q.40

Carbon content in steel is __________ percent.

  • 0.1-2
  • 4-6
  • 2-4
  • 0.001-0.01
Q.41

Aqueous nitric acid is stored in

  • steel drum
  • stainless steel vessel
  • cast iron vessel lined with acid-proof masonry brick
  • cast iron vessel
Q.42

Glass is corroded by

  • fluorine (dry or wet)
  • sulphuric acid
  • phosphoric acid
  • none of these
Q.43

Alinco, which is a aluminium-cobalt-nickel steel, is used for making

  • surgical instruments
  • powerful magnets
  • chemical equipments
  • boiler tubes
Q.44

Slow plastic deformation of metals under a constant stress is termed as __________ failure.

  • fatigue
  • endurance
  • creep
  • none of these
Q.45

Which of the following material of construction may be recommended by a chemical engineer for handling a gaseous chlorine (dry or wet) stream in a fluid flow system ?

  • High silicon iron, silicon rubber, Kel-F and teflon.
  • Mild steel and stainless steel.
  • Cast iron, tin and aluminium.
  • Copper, nickel and monel.
Q.46

Biological shield in a nuclear power reactor is made of

  • concrete
  • steel
  • cadmium
  • zircalloy
Q.47

A hardness depth of about 3 mm can be achieved by induction hardness in __________ seconds.

  • 5
  • 100
  • 250
  • 500
Q.48

Presence of nitrogen in steel

  • makes it brittle.
  • increases its strength.
  • increases its hardness.
  • is desirable.
Q.49

Ceramic materials

  • are exemplified by clay and mica.
  • are poor electrical conductors due to lack of free electrons.
  • never exhibit polymorphism.
  • all (a), (b) and (c).
Q.50

Which of the following is the easiest to bend?

  • Steel
  • Stainless steel
  • Cast iron
  • Wrought iron
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