Phosphate coating is used as an excellent base for paints & enamels
Phosphate coating is less corrosion resistant than chromate coating
The base metal to be electroplated is normally made the cathode of the electrolytic cell and coating metal is made the anode
Calorising is the process of coating steel with chromium
D. Calorising is the process of coating steel with chromium
H2SO3
HF
HNO3
K2Cr2O7
Precedence relationship
Resource idleness
Resource restriction
Necessary time delay
Season cracking of brass
Caustic embrittlement of steel
Both (A) & (B)
Neither (A) nor (B)
Cast iron
Soft brass
Round specimen of ductile metal
Flat tensile specimen of ductile metal
Grease
Solid lubricant
Animal oils
Mineral oils
Retained austenite
Martensite formation
Relatively high sulphur content in the base metal
Sufficient hydrogen present in the welding arc
ΔQ = 0, ΔS=0
ΔQ = 0, ΔS = +ve
ΔQ = 0, ΔS = -ve
ΔQ = +ve, ΔS= +ve
10-3
103
10-15
1015
Electrical resistance welding
Die casting
Semi-centrifugal casting
Continuous casting
Can be determined only experimentally
Can be determined from the stoichiometry of the reaction
Cannot be zero
Can be fractional
Spheroidising
Tempering
Normalising
Annealing
Is always less than 1
Is always greater than 1
Can be 5
Depends on the choice of the standard state
Inversely with thermal conductivity
Directly with heat transfer co-efficient
Directly with thermal conductivity
Inversely with the dimension of the solid
1.5
3
5
7
Flatness
Angle
Rotor balancing
Roughness
Septic tank
Oxidation well
Digestor
Lagoon
High vacuum
Zero pressure
0°K
Earth's centre
Soluble in solid state
Insoluble in liquid state
Insoluble in both solid & liquid state
Soluble in liquid state
Free electrons
Ions
Conduction electrons
Holes
Manganese
Magnesium
Vanadium
Copper
A
l
A2
Both 'a' & 'b'
Easily available
Not soluble in blood at high pressure
Lighter than nitrogen
Completely miscible with oxygen
Casting
Cold working
Forging
Welding
Hot worked materials are subjected to annealing to remove internal stresses
Annealing of steel hardens it slightly
Normalising of a material induces stresses
Tempering of a material improves ductility & toughness but reduces hardness & brittleness
Base and strong acid
Base and weak acid
Acid and weak base
None of these
Molybdenum
Chromium
Tungsten
Vanadium
180°
212°
32°
273°
Hot rolled mild
Cold rolled mild
Forged
Machinable stainless
Adiabatic
Isothermal
Isentropic
Isochoric
Sequence of operation to be performed
Progress of work performed
Authorisation of work to be performed
Balancing of load on machines