Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called
Tempering
Hardening
Annealing
Normalising
- For efficient performance of a blast furnace, the extent of reduction of Wustite (FeO) should be
- Hydrogen in liquid steels is dissolved
- The materials which fracture even at small strains are termed as brittle, while those materials which…
- Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxyacetylene…
- Boiler tube size is specified by its thickness and __________ diameter.
- The most important consideration in value engineering is the
- Which of the following has the least value of ultimate tensile strength (UTS)?
- Thermal efficiency of an internal combustion engine is around __________ percent.
- Wrought iron is never shaped by
- Dryness fraction of dry steam is
- With increase in temperature, the surface tension of water
- On being hit with a hammer, __________ will readily fracture.
- Materials having __________ lattice structure are usually the most ductile.
- Reduction in the grain size reduces the __________ of the material.
- Boiling point of water gets lowered at high altitudes (e.g., hills), because
- Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic…
- Galvanic corrosion cannot be prevented by
- Ammonia leakage in the refrigeration system is detected by
- The malleability of a material is the property by virtue of which it can be rolled or hammered into…
- Wohler test is a destructive test to find out the __________ strength of a prepared metal specimen.
- Which of the following materials has the maximum shrinkage allowance?
- All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in…
- Triple point of water is
- The mechanism involved in the removal of metal in drilling operation is by
- The thickness of oxide film is y at time t. If are the temperature dependent constants, the parabolic…
- With increase in __________ Knocking tendency in a spark ignition petrol engine decreases.
- One ton of refrigeration is not equivalent to the heat removal rate of
- According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear…
- Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.
- Rankine cycle comprises of two isothermal and two __________ processes.