__________ is added in stainless steel to prevent inter crystal corrosion.

Ingrannular corrosion occurs __________ stainless steel.

A

In all types of steels except

B

At the surface of

C

Along grain boundaries of

D

In the core of

Which of the following crystal structures characterises the austenitic stainless steel?

A

Simple hexagonal

B

Body centred cubic

C

Face centred cubic

D

None of these

Which of the following crystal structures characterises the ferritic stainless steel?

A

Face centred cubic

B

Body centred cubic

C

Simple hexagonal

D

None of these

Stainless steel resists corrosion due to

A

Carbon

B

Sulphur

C

Vanadium

D

Chromium

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

Stainless steel is usually made by alloying the steel with

A

Copper and nickel

B

Copper and chromium

C

Chromium and nickel

D

Manganese and copper

Stainless steel এ steel ছাড়া আর কী থাকে?

A

chromium

B

vanadium

C

manganese

D

nickel

The alloy, mainly used for corrosion resistance in stainless steels is

A

Silicon

B

Manganese

C

Carbon

D

Chromium

When the temperature of air leaving the inter-cooler, in a two stage compression with inter-cooler, is ________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.

A

Equal to

B

Less than

C

More than

D

None of these

Corrosion involves exchange of electrons in __________ corrosion.

A

Chemical

B

Electrochemical

C

Both A & B

D

Neither A nor B

__________ is added in stainless steel to prevent inter crystal corrosion.

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