Q.1
All materials obey Hooke's law within elastic limit. When elastic limit is reached, the tensile strain
Q.2
Acetaldehyde is shipped in __________ drums.
Q.3
Aqueous nitric acid is stored in __________ vessel.
Q.4

Hydrochloric acid is stored in a__vessel.

  • lead lined steel
  • rubber lined steel
  • stainless steel
  • cast iron
Q.5

Lead pipe is

  • especially resistant to solutions containing H2SO4.
  • usually joined by burning (e.g. by melting to adjacent pieces with a torch).
  • having very low elastic limit resulting in permanent deformation from either mechanical or thermal strain.
  • all (a), (b) and (c).
Q.6

Hydrochloric acid is __________ corrosive to common metals.

  • least
  • not
  • mildly
  • highly
Q.7

Thermoplastic resins are those polymers, which

  • has decreased plasticity at increasing temperature.
  • can not be moulded.
  • easily deform under pressure at high temperature.
  • none of these.
Q.8

Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its

  • high co-efficient of thermal expansion.
  • low thermal conductivity.
  • high corrosion resistance.
  • all (a), (b) and (c).
Q.9

Presence of high amount of silicon in cast iron

  • suppresses the decomposition of Fe3 C.
  • increases the formation of graphite.
  • increases the contraction of the metal.
  • reduces its fluidity.
Q.10

Wrought iron is

  • high carbon iron.
  • highly resistance to acid corrosion.
  • malleable & ductile; and hence is used for chain links, hooks & couplings.
  • an alloy of iron, chromium & carbon.
Q.11

Inconel is an alloy of

  • tin, zinc and nickel
  • iron, nickel and chromium
  • copper and nickel
  • copper and tin
Q.12

Tempering of steel is done to make it

  • brittle
  • hard
  • rollable
  • soft
Q.13

Sheardising process is used for

  • surface coating.
  • heat treatment of high speed steel.
  • cold working on metals.
  • none of these.
Q.14

Rotary driers are generally made of

  • cast iron
  • mild steel
  • high silicon iron (14% Si)
  • tin lined with refractory bricks
Q.15

Tank furnace used for melting of glass is made of

  • mild steel
  • cast iron
  • refractory blocks
  • stainless steel
Q.16

Hardest materials so far found is

  • diamond
  • graphite
  • carborundum
  • pumice stone
Q.17

The temperature at which new grains are formed in the metal is called the __________ temperature.

  • eutectic
  • recrystallisation
  • upper critical
  • lower critical
Q.18

Pick out the wrong statement.

  • Alloys are harder than their component elements.
  • Presence of silicon in steel decreases its electrical resistance.
  • Karbate is an acid resistant material of construction.
  • Nichrome, a steel alloyed with 10% Ni and 20% Cr can be used upto a temperature of 1100°C.
Q.19

Rubber lined pumps can be used to pump

  • caustic soda
  • chlorinated brine
  • hypochlorous acid
  • all (a), (b) and (c)
Q.20

Perspex is nothing but

  • acrylic sheet
  • an elastomer
  • an alloy of lead and tin
  • aluminium foil clad with bakelite
Q.21

A measure of toughness of a material is its

  • percentage elongation
  • yield strength
  • ultimate strength
  • area under stress-strain diagram
Q.22

Concrete tank can be used to store

  • alum
  • ferrous sulphate
  • sulphuric acid
  • saturated brine
Q.23

The maximum percentage of chromium that can be added to steel is about

  • 12
  • 18
  • 24
  • 30
Q.24

Presence of high phosphorous in cast iron increases its

  • fluidity
  • melting point
  • shrinkage
  • tensile strength
Q.25

Spray dryer for evaporating milk to produce milk powder is made of

  • lead lined steel
  • stainless steel
  • aluminium
  • cast iron
Q.26

Galvanising is not a zinc diffusion process. A zinc diffusion process is termed as

  • sheradising
  • parkerising
  • anodising
  • none of these
Q.27

Molten phthalic anhydride is stored in a/an __________ vessel.

  • aluminium
  • nickel clad steel
  • lead lined steel
  • glass lined steel.
Q.28

Ferric stainless steels compared to austenitic stainless steels

  • have lower corrosion resistance.
  • are harder to fabricate.
  • are less ductile and hence less suitable for cold pressing.
  • all (a), (b) and (c).
Q.29

Titanium metal

  • exists in three allotropic forms.
  • can not be welded.
  • is used in oceanographic and space exploration applications.
  • none of these.
Q.30

Centrifugal pump made of pyrex or glass can't be used to pump

  • milk and fruit juices.
  • alkaline solutions.
  • dilute H2SO4 at room temperature.
  • brine.
Q.31

Polymerisation reactor used for the production of styrene butadiene rubber (SBR) is made of

  • cast iron
  • stainless steel or glass lined vessel
  • karbate
  • wrought iron
Q.32

Zinc is highly __________ at room temperature.

  • ductile
  • resistant to atmospheric corrosion
  • malleable
  • brittle
Q.33

Which of the following is a non-magnetic material ?

  • Cobalt
  • Zinc
  • Nickel
  • None of these
Q.34

The phenomenon in which slow extension of material takes place with the time at constant load is called

  • plasticity
  • creep
  • elasticity
  • ductility
Q.35

Chromel (Nichrome) is an alloy of

  • chromium and molybdenum.
  • nickel and chromium.
  • molybdenum and nickel.
  • chromium and aluminium.
Q.36

Which of the following commercial metals is most abundantly found in India ?

  • Copper
  • Aluminium
  • Nickel
  • Zinc
Q.37

Fatigue failure of a material results from __________ stress.

  • tensile
  • compressive
  • fluctuating
  • none of these.
Q.38

Liners of a ball mill are never made of

  • lead
  • alloy steel
  • rubber or ceramic material
  • cast iron
Q.39

Purity of electrical grade aluminium should be ≥ __________ percent.

  • 95
  • 99.5
  • 85
  • 90
Q.40

Ability of a material to __________ is indicated by its damping capacity.

  • withstand compression
  • absorb vibration
  • absorb shock
  • none of these
Q.41

Cast iron is having very high

  • proximity between its elastic limit and ultimate breaking strength.
  • ductility.
  • tensile strength.
  • all (a), (b) and (c).
Q.42

Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property ?

  • Silicon
  • Phosphorus
  • Sulphur
  • None of these
Q.43

An alloy used as thermocouple material comprises ofnickel andcopper. It is called

  • constantan
  • kanthal
  • chromel
  • German silver
Q.44

A material capable of undergoing large permanent deformation, when subjected to compression is termed as

  • malleable
  • ductile
  • brittle
  • none of these
Q.45

Which of the following is not an alloy of nickel and chromium ?

  • Inconel
  • Hastealloy
  • Nimonic alloys
  • Duralumin
Q.46

Tin vessels are corroded by

  • anhydrous ammonia
  • aromatic solvents
  • synthetic detergent solution
  • none of these
Q.47

Fermenter used in the production of pen-cillin by deep fermentation proces is a __________ lined steel vessel

  • rubber
  • monel
  • glass
  • nickel
Q.48

Maximum consumption of zinc is in

  • alloying
  • galvanising
  • utensil manufacture
  • electrical industry
Q.49

Corrosion resistance of steel is increased by the addition of

  • phosphorous and tungsten.
  • nickel and chromium.
  • lead and vanadium.
  • molybdenum and tungsten.
Q.50

Most common stainless steel typewhich is highly resistant to corrosion contains

  • 16-13% Cr 10-14% Ni and 2-3% Mo.
  • 20-22% Cr, and 8-10% Ni.
  • 2-4% Cr, 22% NI and 2-4% Mo.
  • none of these.
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