The heat treatment to which the steel wire containing > 0.25% carbon is subjected to is
Full annealing
Bright annealing
Patenting
None of these
Correct Answer :
C. Patenting
Related Questions
Electrochemical corrosion can occur, only if __________ is present in contact with metal.
Air
Oxygen
Liquid medium
Gaseous medium
__________ is the trade name assigned to a nonferrous cast alloy composed of cobalt, chromium & tungsten.
Stellite
High speed steel
Cermet
Alnico
Water-tube boiler is the one, in which
Water passes through tubes and flue gases around it
Tube carrying hot flue gases are immersed in a pool of water
Tubes are placed in vertical position
None of these
The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.
60 - 100
400 - 700
1200 -1500
2000 - 2300
Which of the following gases cause global warming?
Carbon monoxide
Carbon dioxide
Nitrogen
Ozone
Pick out the correct statement
Jet engine can work, where there is no atmosphere
Rocket engines cannot work, where there is no atmosphere
Rocket engines carry oxygen required for the combustion in the form of oxidiser
Jet engines also carry oxidiser
Air intake for an air compressor should be preferably taken from
A site, where cooling towers are located nearby
A site, where open coal yard in located nearby
An air conditioned room maintained at a temperature of 18°C
An outside atmosphere at 10°C
Globular form of cementite is formed during the __________ process.
Spheroidising
Hardening
Annealing
Normalising
Cold cracking in the heat affected zone of a high strength steel weld can take place because of the
Retained austenite
Martensite formation
Relatively high sulphur content in the base metal
Sufficient hydrogen present in the welding arc
Oxyacetylene reducing flame is used while carrying out welding on
Alloy steel
Grey cast iron
Mild steel
High carbon steel
Routing in production, planning & control is concerned with the
Sequence of operation to be performed
Progress of work performed
Authorisation of work to be performed
Balancing of load on machines
On being hit with a hammer, __________ will readily fracture.
Brass
Mild steel
Cast iron
Lead
Density in the solid state is slightly less than that in its liquid state, in case of
Carbon dioxide
Water
Mercury
None of these
Thermal efficiency of an internal combustion engine is around __________ percent.
8
35
65
80
Sudden fall of atmospheric pressure by a large amount is an indication of the
Rain
Cold wave
Storm
Fair weather
Which one of the following is incombustible?
H2
CCl4
C2H2
S
The majority charge carriers in p-type silicon are
Free electrons
Ions
Conduction electrons
Holes
__________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C.
Veneering
Galvanising
Electroplating
Calorising
Pick out the wrong statement about nucleate boiling.
Bubble generation is by expansion of entrapped gas/vapour at small cavities in the surface
Surface temperature is greater than the saturation temperature of the liquid
Heat transfer from the surface of the liquid is less than that in film boiling
The temperature is less than that of film boiling
Alloy powder manufactured by the following process have spherical shapes.
Electrochemical deposition
Gaseous reduction
Atomisation
Mechanical attrition
Cold working of a material results in increase in hardness, which is termed as the __________ hardening.
Cold
Work
Age
Induction
While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the
Low impact strength
High flexibility
Better finish and surface appearance
High plastic deformation
In connection with corrosion of metals, passivation is the process that
Intensifies deterioration
Changes the composition of the metal
Inhibits further deterioration
None of these
Maximum hardenability of steel depends upon its
Chemical composition
Carbon content
Grain size
Alloying elements content
Which of the following heat treatment processes is usually applied to castings?
Tempering
Annealing
Normalising
Carburising
Dry saturated steam can be converted into superheated steam by
Increasing its cross-sectional area of flow
Passing it through a pressure reducing valve
Forcing it downwards through a vertical tube
None of these
Breakeven point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost
Only
Plus variable cost
Plus overhead cost
Plus selling expenses
__________ stress cannot be sustained by a fluid in equilibrium.
Shear
Tensile
Compressive
None of these
Secondary hardening in steels arises out of the
Precipitation of fine alloy carbides at high temperatures
Refinement of ferrite grain size by working
Decomposition of retained austenite upon heat treatment
Precipitation of complex inter-metallic upon heat treatment
Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are __________ respectively.
70 & 30
30 & 70
50 & 50
90 & 10