Oxide layer formed on the non-ferrous metal surface after its annealing is
Removed by acid pickling
Hammered into the surface
Removed with coarse emery cloth
Left as such to protect the surface
- The units of the rate constant for a second order reaction are
- A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation…
- While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous…
- Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C.
- Pick out the wrong statement.
- For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other…
- Magnetic permeability of iron is increased by its
- Babbitt lining is used on brass/bronze bearings to increase the
- Solute atoms which cause yield point phenomenon in mild steel are/is
- Dislocations are __________ defects.
- When an isolated thermodynamic system executes a process,
- The excess air required for the combustion of pulverised coal is of the order of about __________ percent.
- Addition of silicon to cast iron
- Matte smelting is used in the extraction of
- Encyclopaedia of Chemical Technology has been
- Lap joints are preferred over butt joints in soldering/brazing, because these joints are
- Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.
- Dry saturated steam can be converted into superheated steam by
- Vibration upto 100 kilo hertz can be most accurately measured by a __________ type accelerometer.
- Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure.
- __________ is not a case hardening process.
- The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400°D & 100°D…
- Electrometallurgical methods of metal extraction is normally used for those metals
- In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________…
- Lead pencil contains
- In a good rimming steel
- A highly elastic material is deformed least on loading and retains its original form on removal of the…
- Which of the following metals is the most prone to work hardening?
- Which of the following is not a characteristic observed in material failure by fatigue fracture?
- Magnesium is present in