Abrasion resistance
Toughness
Red hardness
Cutting speed
B. Toughness
Outside
Inside
Mean
None of these
Carbon dioxide
Carbon monoxide
Oxygen
Air
Intensifies deterioration
Changes the composition of the metal
Inhibits further deterioration
None of these
Cast iron
Soft brass
Round specimen of ductile metal
Flat tensile specimen of ductile metal
Speed of the extruded material is same as that of ram speed
Redundant work is a function of the die angle
Relative motion between the billet surface and the container wall is always present
Hollow ram is used for indirect extrusion
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
Softens it to facilitate machining
Decreases the free carbon
Increases the strength
None of these
Pressure falls below the vapour pressure
Pressure becomes very high
Temperature becomes low
All 'a', 'b' & 'c'
Alumina
Alkali oxide
Lime & Magnesia
None of these
Elastic
Ultimate
Yielding
Breaking
Visco-elastic
Isotropic
Elastic
Plastic
High temperature heating medium (a petroleum product)
Product of coal tar distillation
Very heat sensitive material
None of these
Are magnetised by eddy currents only
Are non-magnetic and cannot be magnetised
Are magnetised in direction opposite to the magnetic field
Can be magnetised in one direction only
Brass
Aluminium
Copper
Lead
Tin
Copper
Zinc
Aluminium
Seam welding, projection welding & spot welding are the classification of electrical resistance welding
Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t = plate thickness to be welded)
In spot welding, two pieces to be joined are overlapped and placed between two electrodes
Mild steel sheet cannot be spot welded
273.15
225.65
100.03
373.15
1 stoke = 1 cm2/sec
1 N.sec/m2 = 10 paise
1 stoke = 1 m2/sec
1 m2/sec = 104 stokes
Partial condensation of steam
Vibration of the pipeline
High degree of superheat of steam
Its exposure to torrential rain
1.5
3
5
7
Hot metal
Flue gases
Slag
Refractory lining
Mechanical
Overall
Volumetric
Impeller
Evaporative capacity
Evaporation efficiency
Thermal efficiency
Steam load
The better insulation material should be put just next to pipe (i.e., inside)
The better insulating material should be put outside
Either of the insulating material could be put on either side
Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)
Air
Oxygen
Liquid medium
Gaseous medium
2300 J
4600 J
230 J
2.3 × 106 J
Bolt
Stud
Set screw
Split nut
14 : 1
22 : 1
25 : 1
4 : 1
Authored by Kirk Othmer
Edited by Perry and Chilton
Edited by Kirk Othmer
Authored by Perry and Chilton
Cementite
Pearlite
Martensite
Ferrite