In order to remove internal stresses produced by hardening the steel, the process usually adopted is

The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?

A

Cyaniding

B

Sheardising

C

Spherodising

D

None of these

The bending moment at a section tends to bend or deflect the beam and the internal stresses resist its bending. The resistance offered by the internal stresses, to the bending, is called

A

Compressive stress

B

Shear stress

C

Bending stress

D

Elastic modulus

Which is false statement about case hardening? Case hardening is done by

A

Electroplating

B

Cyaniding

C

Induction hardening

D

Nitriding

Which of the following steel making process is being adopted at Rourkela (in India) Steel Plant?

A

Bessemer process

B

Open hearth process

C

Electric process

D

LD process

In a hardening process, the hypo-eutectoid steel is

A

Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air

B

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

C

Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

D

Heated below or closes to the lower critical temperature and then cooled slowly

A steel mill produces 180 tons of steel per month Raw materials cost for each ton of production is Tk. 1200. Other expenses of that mill are Tk. 90,000 in each month what should be the selling price of each ton of steel in order to make 10% profit?

A

1870

B

1845

C

1842

D

18145

In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

A

The effect of curvature of the cylinder wall is neglected

B

The tensile stresses are uniformly distributed over the section of the walls

C

The effect of the restraining action of the heads at the end of the pressure vessel is neglected

D

All of the above

Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is __________ percent.

A

0.02

B

0.2

C

0.35

D

0.5

For hardening high alloy steel, it is to be heated slowly and uniformly to avoid

A

Local hardening

B

Scale formation

C

Segregation

D

Warpage

The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment.

A

0.2

B

0.4

C

0.6

D

0.8

In order to remove internal stresses produced by hardening the steel, the process usually adopted is

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