Related Questions

Heat treatment of steel is done to mainly change its __________ properties.
A Physical
B Chemical
C Mechanical
D Surface
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
Sub zero treatment of steel is done to
A Suppress martensite transformation
B Enhance its working performance in sub zero atmosphere
C Reduce the retained austenite in hardened steel
D Induce temper brittleness after its hardening
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
The heat treatment process applied to cold formed steel parts is
A Normalising
B Tempering
C Artificial ageing
D Solution annealing
The heat treatment process used for softening hardened steel is
A Carburising
B Normalizing
C Annealing
D Tempering
The heat treatment process to which castings and the steel balls produced by cold heading are subjected is
A Tempering
B Normalising
C Annealing
D None of these

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