Related Questions

The addition of lead, sulphur and phosphorus to low carbon steels, help to
A Reduce built up edge
B Break up chips
C Improve machinability
D All of these
Presence of small quantity of sulphur in low carbon steel improves its
A Formability
B Machinability
C Weldability
D Hardenarality
Addition of __________ to steel does not help in improving its machinability.
A Sulphur
B Silicon
C Lead
D Phosphorous
Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.
A Chromium
B Nickel
C Tungsten
D Cobalt
Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes
A Paralysis of muscles & loss of appetite
B Nervous depression
C Gastritis & diarrhea
D All of the above
The most reactive allotropic form of phosphorus is __________ phosphorus.
A Red
B Yellow
C Violet
D Black
Maximum sulphur percentage in low sulphur heavy stock (LSHS) furnace oil is about
A 0.1
B 1
C 2.5
D 3.5
The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is _________ cutting speed for drilling mild steel with high speed steel drills.
A Equal to
B Less than
C More than
D None of these
Pig iron made from haematite ores free from sulphur, phosphorus and copper, is known as
A Bessemer pig
B Grey or foundry pig
C White or forge pig
D Mottled pig
The process of improving the quality of rubber by heating it with sulphur is called
A Vulcanization
B Acceleration
C Sulphonation
D Galvanization

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