Hot extrusion of aluminium is done in the temperature range of __________ °C.
550-600
450-500
350-400
250-300
- Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical…
- What is the percentage of chromium in 18-4-1 high speed steel?
- The material used for coating the welding electrode is termed as the
- For grinding of softer materials, the grinding wheel should have __________ grain size.
- Air-petrol ratio for maximum power generation in spark ignition engine is about
- Change in volume of metals from absolute zero temperature to their melting points is
- With increase in temperature, the surface tension of water
- Desalination of water
- The noble metals
- The most abundant metal present in the earth's crust is;
- Even though heat transfer co-efficient in boiling liquids is large, use of fins is advantageous, when…
- The product (s) of roasting of a sulphide ore is (are)
- The same volume of all gases is representative of their
- Pick out the correct statement about the condensation.
- Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at…
- Addition of __________ to steel does not impart hardness.
- Heating of ferromagnetic materials to a temperature above Curie temperature makes it
- While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous…
- Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10-2 atm, the partial…
- The difference between gross & net calorific values of fuel is due to the
- Triple point of water is
- Pick out the wrong statement.
- Wrought iron is never shaped by
- The only suitable method for hardening the low carbon steel is case hardening. Which of the following…
- Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling…
- Brazing is the joining of metals
- Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal &…
- Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed…
- Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxyacetylene…
- Out of the following, the alloy which has equal percentage of constituents, is