Related Questions

The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the __________ stress.
ক Working
খ Damaging
গ Allowable
ঘ None of these
The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or
ক 12 bar diameters
খ 18 bar diameters
গ 24 bar diameters
ঘ 30 bar diameters
The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be
ক Same in both cases
খ 2 times more
গ 3 times more
ঘ 4 times more
Which one among the following would expand the most on being heated?
ক Air
খ Water
গ Alcohol
ঘ Glass
When heated an iron bar expands 0.2% . If the increased length is 1cm , what is the original length of the bar ?
ক 500cm
খ 5cm
গ 0.97cm
ঘ 1.97cm
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?)
ক 1 :8
খ 1 : 6
গ 1 : 4
ঘ 1 : 2
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?)
ক 1:8
খ 1:6
গ 1:4
ঘ 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.
ক Equal to
খ Less than
গ More than
ঘ None of these
When a bar of length '$$l$$' and diameter 'd' is rigidly fixed at the upper end and hanging freely, then the total elongation produced in the bar due to its own weight is (where w = Weight per unit volume of the bar)
ক $$\frac{{{\text{w}}l}}{{2{\text{E}}}}$$
খ $$\frac{{{\text{w}}{l^2}}}{{2{\text{E}}}}$$
গ $$\frac{{{\text{w}}{l^3}}}{{2{\text{E}}}}$$
ঘ $$\frac{{{\text{w}}{l^4}}}{{2{\text{E}}}}$$
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?
ক 1870
খ 1845
গ 1842
ঘ 18145

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