In this type of concrete, the steel is pre-tensioned before the superimposed load is applied:

Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than

A

35 MPa and 42 MPa

B

42 MPa and 35 MPa

C

42 MPa and 53 MPa

D

53 MPa and 42 MPa

The maximum slenderness ratio of a compression member carrying both dead and superimposed load is

A

180

B

200

C

250

D

350

Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal

A

Tensile strength

B

Compressive strength

C

Young's modulus

D

Thermal co-efficient of expansion

The ratio of the stresses produced by a suddenly applied load and by a gradually applied load on a bar, is

A

$$\frac{1}{4}$$

B

$$\frac{1}{2}$$

C

1

D

2

For the supply of materials for concrete, form work reinforcing and placing of concrete, removal of form work and curing of concrete, number of bar(s) required on bar chart, is

A

1

B

2

C

3

D

4

When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which (where, Fa is the load shared by each rivet due to axial load and Fm is the shearing load due to moment in any rivet.)

A

Is at the maximum distance from CG of the rivet group

B

Is at the minimum distance from CG of the rivet group

C

Gives the maximum angle between the two forces Fa and Fm

D

Gives the minimum angle between the two forces Fa and Fm

In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed

A

10 mm

B

15 mm

C

20 mm

D

25 mm

In which beam tension capacity of steel is greater than combined compression capacity of steel and concrete?

A

Over-reinforced

B

Under-reinforced

C

Singly reinforced

D

Doubly reinforced

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

In this type of concrete, the steel is pre-tensioned before the superimposed load is applied:

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