20
200
500
2000
B. 200
Aluminium
Tin
Lead
Both (B) & (C)
Exchange between two liquid phases
Exchange between a gaseous phase and a liquid phase
Exchange between a liquid phase and an organic resin phase
Exchange between a solid phase and a gas phase
Partial pressure of water vapour is less than the total pressure
Humidity is < 100% & dew point temperature of air has not reached
Dew point temperature of air has not reached & air is not saturated fully
Air is fully saturated
Cotton, silk and paper
Asbestos, glass, porcelain and mica
Rubber and polymeric resins
All refractory materials
Tempering
Annealing
Normalising
Carburising
0.015
0.71
1.2
3.5
Are good conductor of heat & electricity
Act as electron donors with metals & as electron acceptor with non-metals
Are not necessarily solids at room temperature
Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron
Motion of dislocations
Stretching of atomic bonds
Breakage of atomic bonds
None of the above
9.5 : 1
12.5 : 1
15.5 : 1
18.5 : 1
1.0
1.3
2.3
3.3
Concentration
Velocity
Temperature
None of these
Grain refining
Grain coarsening
Surface hardening
Shot peening
Temperature is low
Atmospheric pressure is low
Atmospheric pressure is high
None of these
Admiralty brass
Stainless steel
Aluminium brass
Titanium
Processing of thermosetting plastics is ideally done by injection moulding
Processing of thermoplastics is ideally done by compression moulding
Mass production of seamless pipes are done by electrical resistance welding (ERW)
Stretch forming is a process of cold drawing
2.5
3.75
4.75
5.25
Tempering
Rapid heating
Rapid cooling
Slow cooling
Deviation
Derivative time
Error ratio
Differential gap
Occurs higher in the electro-chemical series of metals
Is exemplified by magnesium plate
Is much cheaper than the cathodic base material to be guarded against corrosion
All (A), (B) & (C)
Blow off cock
Feed check valve
Feed water pump
Stop valve
5-10
1000-1500
120-500
1500-3000
I.D. & O.D. of the shaft
Thickness of parts
Depth of holes
Clearance between two mating surfaces
Metal changes from liquid state to solid state at freezing temperature
Solid phase temperature drops from freezing temperature to the room temperature
Liquid metal temperature drops from pouring temperature to room temperature
Liquid metal temperature drops from pouring temperature to freezing temperature
Stainless steel
Mild steel
High speed steel
High carbon steel
Decrease gradually
Increase gradually
Increase rapidly
Remain constant
Drain out water and sludge from the boiler during repair
Put off fire in the furnace when water level in the boiler falls to unsafe limit
Guard the boiler in case of abnormal rise in steam pressure
All (A), (B) & (C)
0
0.33
0.44
0.25
Babbitt metal
Gun metal
Stainless steel
Duralumin
5
10
20
35
60 - 100
400 - 700
1200 -1500
2000 - 2300