ONGC civil engineering questions

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1. A rectangular beam of length I supported at its two ends carries a central concentrated load W at its centre. The maximum deflection occurs

at the ends

at 1/3 from both ends

at the mid span-Answer

at 1/4 from both ends


2. If the depth is kept constant for beam of uniform strength then its width will vary proportional to

M-Answer


Sqrt(M)

M^2

M^3


3. When a beam deflects into a uniform strength then its width will vary proportional to

I/2R

I/8R

I^2 /8R-Answer

I^2 /2d


4. The longitudinal stress in a thin cylindrical shell is

Pd/4t-Answer

Pd/2t

Pt/4d

Pt/2d


5. The ratio of maximum shear stress and average shear stress for a rectangular section is

1.5-Answer


2

2.5

3


6. A fixed beam of span L carries a central point load W. The maximum sagging bending moment in the beam is

WL/2

WL/4-Answer

WL/8

WL/16


7. Air entrainment in the concrete increases

workability

strength-Answer


the effects of temperature

the unit weight


8. The relation between modulus of rupture Fcr and characteristic strength of concrete Fck is given by

Fcr = 0.35 S Fck-Answer

Fcr = 0.5 S Fck

Fcr = 0.7 S Fck

Fcr = 1.2 S Fck


9. The compressive strength of 100 mm cube as compared to 150 mm cube is always

less

more

equal-Answer

may be any of the above


10. For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine's theory

is always less than 1

is always greater than 1-Answer


can be more than 1

can be less than 1
11. For bars in tension a standard hook has an anchorage value equivalent to a strength length of

8

12

16-Answer

24

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

350 Kg/cm^2 and 420 Kg/cm^2

420 Kg/cm^2 and 530 Kg/cm^2-Answer


420 Kg/cm^2 and 350 Kg/cm^2

530 Kg/cm^2 and 420 Kg/cm^2


13. The creep strains are

caused due to dead loads only-Answer

caused due to live loads only

caused due to both dead and live load

independent of loads


14. Ratio of compressive strength to tensile strength of concrete

increases with age-Answer

decreases with age

remains constant



15. In limit state design of concrete for flexure, the area of stress block is taken as

0.36 Fck Xu-Answer


0.42 Fck Xu

0.446 Fck Xu

0.53 Fck Xu


16. The fitness modulus of the fine aggregate is in the range of

2.0 to 3.5-Answer

3.5 to 5.0

5.0 to 7.0

6.0 to 8.5


17. According to IS:456-1978, the maximum reinforcement in a column is

2%

4%

6%-Answer

8%


18. The minimum cover in a slab should neither be less than the diameter of bar nor less than

10 mm

15 mm-Answer

20 mm

13 mm


19. If the permissible stress in steel in tension is 140 N/mm^2, Permissible stress in concrete in bending compression is 5N / mm^2. Then the depth of neutral axis for a singly reinforced rectangular balanced section will be

0.35 d

0.40 d-Answer

0.45 d

dependent on grade of concrete also


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

less than 1

between 1 and 1.5

between 1.5 and 1.2

greater than 2-Answer



21. In any beam when the moment of inertia about the neutral axis is doubled, its deflection is

doubled

tripled

halved-Answer

minimum


22. The limits of percentage of the longitudinal reinforcement in a column is given by

0.15% to 2%

0.8% to 4%

0.8% to 6%-Answer

0.8% to 8%


23. A rigid prop provided for a beam

brings the bending for a beam

brings the deflection at the prop to zero-Answer

brings the slopes at the section to zero

brings the shear force at the section to zero


24. In a simply supported beam AB with a concentrated load W at a distance 'a' from support A and 'b' from support B, the deflection under the load is

wa^2 b^2 / 3EIL-Answer

wa^2 / 3EI

wa^2 b^2 /3EI

wa^2 b + 2/EIL


25. For the design of retaining walls the minimum factor of safety against over-turning is taken as

1.5

2.0-Answer

2.5

3.0


26. A cantilever beam is loaded by a point load at the free end. It is likely to fail by B.M.

under the load

at mid span

at support-Answer

none


27. The distance between centre lines of a broad gauge is 1.686m. The most economic length of sleeper for efficient distribution of B.M. is

1.866 m

2.866 m-Answer

3.866 m

0.866 m

28. In a simply supported beam of span L carrying an eccentric couple M acting at a distance A from the left support, the reaction included at the support is

M/L-Answer

L/M

ML

1/ML

29. Area of shear force diagram between two sections is

70 KNm

140 KNm-Answer

280 KNm



30. The section modulus of square section of side A is

a^2 /6

a^3 /6-Answer


a^4 /12

a^3 /12

31. The minimum percentage of mild steel reinforcement in walls of RCC water tanks of 450 mm thick is about

0.20-Answer

0.30

0.24

0.16