When the steel is subjected to normalising, its __________ decreases.

Normalising of steel is done to

A

Refine the grain structure

B

Remove strains caused by cold working

C

Remove dislocations caused in the internal structure due to hot working

D

All of the above

Normalising does not __________ of a metal.

A

Improve machinability & tensile strength

B

Remove internal stresses

C

Refine the structure

D

Remove strains caused by cold working

Normalising of a casting does not

A

Induce stresses in it

B

Refine its grain structure

C

Reduce seggregation

D

Improve its mechanical properties

Normalising of an object does not

A

Refine coarse grain structure obtained during hot working

B

Improve ductility

C

Improve yield strength

D

Improve machanical properties

Whitworth compressed steel is obtained when molten steel is subjected to a pressure of

A

5 kg/mm²

B

9 kg/mm²

C

13 kg/mm²

D

15 kg/mm²

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

10 cm লম্বা ও 0.5 cm ব্যাসার্ধ বিশিষ্ট একটি তামা ও একটি লোহার তারকে জোড়া লাগিয়ে দৈর্ঘ্য 20 cm করা হল। জোড়া লাগানো তারটিকে বল প্রয়োগ করে লম্বা করা হল। লোহার ইয়ংয়ের গুণাঙ্ক তামার ইয়ংয়ের গুণাঙ্কের দুইগুণ হলে লোহার দৈর্ঘ্য বৃদ্ধি ও তামার দৈর্ঘ্য বৃদ্ধির অনুপাত কত? ( A steel and a brass wire, both having 10 cm length and 0.5 cm radius, are joined together making the total length of the combined wire 20 cm. The combined wire is stretched by applying a force. If the Young's modulus of steel is twice as much as that of brass, what will be the ratio of the extension of steel to the extension of brass?)

A

1 :8

B

1 : 6

C

1 : 4

D

1 : 2

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

10 cm লম্বা ও 0.5 cm ব্যাসার্ধ বিশিষ্ট একটি তামা ও একটি লোহার তারকে জোড়া লাগিয়ে দৈর্ঘ্য 20 cm করা হল। জোড়া লাগানো তারটিকে বল প্রয়োগ করে লম্বা করা হল। লোহার ইয়ংকের গুণাস্ক তামার ইয়ংকের গুণাস্কের দুইগুন হলে লোহার দৈর্ঘ্য বৃধি ও তামার দৈর্ঘ্য বৃদ্ধির অনুপাত কত? (A steel and a brass wire, both having 10 cm length and 0.5 cm radius, are joined together making the total length of the combined wire 20 cm. The combined wire is stretched by applying a force. If the Young‘s modulus of steel is twice as much as that of brass, what will be the ratio of the extension of steel to the extension of brass?)

A

1:8

B

1:6

C

1:4

D

1:2

If the side of a square decreases by 30%, then the area of the square decreases by :

A

14%

B

21%

C

49%

D

51%

When the steel is subjected to normalising, its __________ decreases.

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