Which of the following has no effect on the carbide forming tendency in steels?

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

Which of the following has no effect on the carbide forming tendency in steels?

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