The slab is designed as one way if the ratio of long span to short span is

An R.C.C. roof slab is designed as a two way slab if

A

It supports live loads in both directions

B

The ratio of spans in two directions is less than 2

C

The slab is continuous over two supports

D

The slab is discontinuous at edges

কাগজের ভার হিসাবে ব্যবহৃত একটি পুরু কাচ (প্রতিসরাঙ্ক 1.5) খন্ডের উপর থেকে খাড়া নীচের দিকে তাকালে কাগজের উপর একটি দাগ কাচের উপর প্রান্ত থেকে 6 cm নীচে দেখা যায়। কাচ খন্ডতির পুরুত্ব কত? (When you look downward from the top of a thick glass (refractive index 1.5) slab used as a paper weight, a mark on the paper is seen 6 cm below from the top of the slab. What is the thickness of the glass slab?)

A

4 cm

B

6 cm

C

9 cm

D

12 cm

কাগজের ভার হিসাবে ব্যবহৃত একটি পুরু কাচ (প্রতিসরাঙ্ক 1.5) খণ্ডের উপর থেকে খাড়া নীচের দিকে তাকালে কাগজের উপর একটি দাগ কাচের উপর প্রান্ত থেকে 6 cm নীচে দেখা যায়। কাচ খন্ডটির পুরুত্ব কত? (When you look downward from the top of a thick glass (refractive index 1.5) slab used as a paper weight, a mark on the paper is seen 6 cm below from the top of the slab. What is the thickness of the glass slab?)

A

4 cm

B

6 cm

C

9 cm

D

12 cm

If the main reinforcement of the slab is parallel to a T-beam, the transverse reinforcement at mid span of the slab is provided at least __________ of main reinforcement.

A

40%

B

50%

C

60%

D

70%

For a continuous floor slab supported on beams, the ratio of end span length and intermediate span length, is

A

0.6

B

0.7

C

0.8

D

0.9

If the ratio of long and short spans of a two way slab with corners held down is r, the actual reduction of B.M. is given by

A

$$\frac{5}{6}\left( {\frac{{\text{r}}}{{1 + {{\text{r}}^2}}}} \right){\text{M}}$$

B

$$\frac{5}{6}\left( {\frac{{{{\text{r}}^2}}}{{1 + {{\text{r}}^2}}}} \right){\text{M}}$$

C

$$\frac{5}{6}\left( {\frac{{{{\text{r}}^2}}}{{1 + {{\text{r}}^3}}}} \right){\text{M}}$$

D

$$\frac{5}{6}\left( {\frac{{{{\text{r}}^2}}}{{1 + {{\text{r}}^4}}}} \right){\text{M}}$$

If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span of a square flat slab, should not be less than

A

$$\frac{{{\text{WL}}}}{{12}}{\left( {{\text{L}} - \frac{{2{\text{D}}}}{3}} \right)^2}$$

B

$$\frac{{{\text{WL}}}}{{10}}{\left( {{\text{L}} + \frac{{2{\text{D}}}}{3}} \right)^2}$$

C

$$\frac{{{\text{WL}}}}{{10}}{\left( {{\text{L}} - \frac{{2{\text{D}}}}{3}} \right)^2}$$

D

$$\frac{{{\text{WL}}}}{{12}}{\left( {{\text{L}} - \frac{{\text{D}}}{3}} \right)^2}$$

If ‘W’ is the load on a circular slab of radius ‘R’, the maximum radial moment at the centre of the slab, is

A

$$\frac{{{\text{W}}{{\text{R}}^2}}}{{16}}$$

B

$$\frac{{2{\text{W}}{{\text{R}}^2}}}{{16}}$$

C

$$\frac{{3{\text{W}}{{\text{R}}^2}}}{{16}}$$

D

$$\frac{{5{\text{W}}{{\text{R}}^2}}}{{16}}$$

If W is the load on a circular slab of radius R, the maximum circumferential moment at the centre of the slab, is

A

$$\frac{{{\text{W}}{{\text{R}}^2}}}{{16}}$$

B

$$\frac{{2{\text{W}}{{\text{R}}^2}}}{{16}}$$

C

$$\frac{{3{\text{W}}{{\text{R}}^2}}}{{16}}$$

D

Zero

If the maximum bending moment of a simply supported slab is M Kg.cm, the effective depth of the slab is (where Q is M.R. factor)

A

$$\frac{{\text{M}}}{{100{\text{Q}}}}$$

B

$$\frac{{\text{M}}}{{10\sqrt {\text{Q}} }}$$

C

$$\sqrt {\frac{{\text{M}}}{{\text{Q}}}} $$

D

$$\sqrt {\frac{{\text{M}}}{{100{\text{Q}}}}} $$

The slab is designed as one way if the ratio of long span to short span is

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