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Quiz 5
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Q.1
Hardened steel is softened by
Normalising
Tempering
Annealing
Carburising
Q.2
Which of the following has the poorest wel-dability?
Low carbon steel
Mild steel
Wrought iron
High-carbon steel
Q.3
Photographic plates are coated with
Silver nitrate
Silver halide
Calcium silicate
Metallic silver
Q.4
Graphite is a good
Thermal & electrical insulator
Conductor of heat
Conductor of electricity
Both B & C
Q.5
Gun metal is an alloy of
Nickel, tin and copper
Copper, tin and zinc
Copper, phosphorus and nickel
Manganese, phosphorus and nickel
Q.6
Which is the purest form of iron?
Wrought iron
Pig iron
Bessemer iron
Grey iron
Q.7
Galvanised iron is
Harder
Protected from rusting
Alumina coated iron
None of these
Q.8
Age hardening is concerned with
Copper
Brass
Duralumin
Silver
Q.9
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.10
Graphite is corroded by
Sulphuric acid (10%)
Sea water
Hydrochloric acid
None of these
Q.11
Pick out the wrong statement.
Pure rubber is as useless as pure gold as a material of construction
Thermal conductivity of aluminium is higher than that of copper; hence it is increasingly used for utensil making
Copper has poor weldability
Reinforced plastics are made from both thermoplastic as well as thermosetting plastics
Q.12
Aluminium storage vessel can be used to store
Aqua regia
Ferrous sulphate
Hydrochloric acid (10%)
None of these
Q.13
A material no longer behaves elastically beyond
Plastic limit
Limiting load
Elastic limit
Breaking load
Q.14
German silver in an alloy of
Copper, nickel and zinc
Copper, aluminium and silver
Silver, zinc and aluminium
Silver, nickel and zinc
Q.15
The largest consumption of zinc for alloys is in the making of
Bearing metal
Brasses
Brazing solder
Die casting alloys
Q.16
Which of the following is a non-magnetic material?
Cobalt
Zinc
Nickel
None of these
Q.17
Which of the following is not a non-ferrous alloy?
Meehanite
Magnalium
Gun metal
Muntz metal
Q.18
Pick out the wrong statement.
Wrought iron contains about 0.02% carbon
Wrought iron can not be easily forged and welded
The chilled cast iron does not contain graphite
Spheroidal grey cast iron contains graphite flakes
Q.19
Softening of hardned steel is done by its
Normalising
Tempering
Annealing
Carburising
Q.20
__________ possesses viscoelastic properties.
Cork
Glass
Graphite
Rubber
Q.21
Fatigue failure of a material results from __________ stress.
Tensile
Compressive
Fluctuating
None of these
Q.22
Trough of an apron conveyor is made of
Lead lined concrete vessel
Wood
Metal
Either B or C
Q.23
Presence of cobalt in steel improves its
Cutting ability
Corrosion resistance
Tensile strength
None of these
Q.24
Which has the maximum melting point out of the following?
Steel
Cast iron
Stainless steel
Wrought iron
Q.25
The crystal structure of most of the common metals is
Orthorhombic
Cubic
Hexagonal
None of these
Q.26
Presence of nickel in steel improves its
Corrosion resistance
Cutting ability
Wear resistance
All of the above
Q.27
Ceramic materials fabrication can not be done by
Welding
Slip casting
Extrusion
Plastic pressing
Q.28
__________ is added in stainless steel to prevent inter crystal corrosion.
Vanadium
Niobium
Chromium
Nickel
Q.29
__________ is never shipped in glass carboys.
Ammonia
Acetic acid
Phenol
Formaldehyde
Q.30
Neutraliser tank used for reacting nitric acid with ammonia for the production of ammonium nitrate is made of
Aluminium
Stainles steel
High silicon (14%) iron
Copper
Q.31
Most suitable material of construction for the storage of concentrated nitric acid is
Cast iron
Monel
Karbate
Aluminium or chromium alloys (Cr > 18% for cold acid)
Q.32
Which of the following pairs of elements may form an alloy?
Iron & carbon
Iron & mercury
Platinum & mercury
None of these
Q.33
The damage/deterioration of metals by the __________ action of fluids is called 'erosion'.
Abrasive
Corrosive
Both A & B
Neither A nor B
Q.34
Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of
Rubber lined mild steel
Lead lined mild steel
Aluminium
Cast iron
Q.35
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.36
In order to be called steel, an alloy should have iron percentage greater than
80
70
90
50
Q.37
Which of the following crystal structures characterises the austenitic stainless steel?
Simple hexagonal
Body centred cubic
Face centred cubic
None of these
Q.38
Which of the following is a light alloy?
Monel metal
Dow metal
German silver
Babbit metal
Q.39
A material capable of undergoing large permanent deformation, when subjected to tension is termed as
Friable
Ductile
Brittle
None of these
Q.40
Which one occupies the lowermost position in the electromotive series of metals?
Aluminium
Noble metals (Ag, Pt, Au)
Zinc
Alkali metals (K, Na, Li)
Q.41
Carbon percentage is the same in cast iron and
Wrought iron
Pig iron
Mild steel
High silicon (14%) iron
Q.42
Which one contains the least percentage of carbon?
Wrought iron
High speed steel
Cast iron
Pig iron
Q.43
Which of the following has no effect on the carbide forming tendency in steels?
Molybdenum
Phosphorus
Chromium
Vanadium
Q.44
Which of the following has a very high carbide forming tendency in steels?
Silicon
Chromium
Nickel
Vanadium
Q.45
Cast irons are generally specified by their
Carbon content
Tensile strength
Hardness
Manufacturing proces
Q.46
Galvanising is not a zinc diffusion process. A zinc diffusion process is termed as
Sheradising
Parkerising
Anodising
None of these
Q.47
Nitriding of steel is a process for
Case hardening
Spheroidising
Normalising
Annealing
Q.48
The ability of a material to offer resistance to scratching or indentation is a measure of its
Brittleness
Toughness
Hardness
Resilience
Q.49
Cast iron has
High ductility
High malleability
Very high tensile strength
Its elastic limit very close to ultimate breaking strength
Q.50
Carbon is present in the uncombined (graphitic) form in case of
Cast iron
Steel
Ferroalloy
None of these
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