Related Questions

Which of the following has a very high carbide forming tendency in steels?
A Silicon
B Chromium
C Nickel
D Vanadium
For hardening alloy steels and high speed steels, they are heated to
A 1100 to 1300°C
B 1300 to 1500°C
C 500 to 600°C
D 700 to 900°C
'Killed steels' are those steels
A Which are destroyed by burning
B Which after their destruction are recycled to produce fresh steel
C Which are deoxidized in the ladle with silicon and aluminium
D In which carbon is completely burnt
Steels with high carbon equivalent have poor weldability, because in these steels during welding
A Carbon and other alloying elements get oxidised from the weld pool
B Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld
C Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld
D Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld
Ferric stainless steels compared to austenitic stainless steels
A Have lower corrosion resistance
B Are harder to fabricate
C Are less ductile and hence less suitable for cold pressing
D All of the above
Which of the following has the highest gum forming tendency in gosoline?
A Paraffins
B Diolefins
C Aromatics
D Naphthenes
Which of the following pairs regarding the effect of alloying elements in steels are not matched correctly?
A Cobalt: It contributes to rerl hardness by hardening ferrite
B Molybdenum: It forms abrasion resisting particles
C Phosphorous: It improves machinability in free cutting steels
D Silicon: It reduces oxidation resistance
আদ্র বাতাসের সংস্পর্শে ক্যালশিয়াম কার্বাইড নিম্নের কোন যৌগটি উৎপন্ন করে? (Which of the following compound is produced when calcium carbide gets contact with moist air?)
A Ethene
B Ethane
C Ethyne
D Ethanal
আর্দ্র বাতাসের সংস্পর্শে ক্যালশিয়াম কার্বাইড নিম্নের কোন যৌগটি উৎপন্ন করে? (Which of the following compound is produced when calcium carbide gets contact with moist air?)
A Ethene
B Ethane
C Ethyne
D Ethanal
In which of the following activities silicon carbide is used?
A Making cement and glass
B Disinfecting water of ponds
C Cutting very hard substances
D Making casts for statues

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