### Civil Engineering - Structural Design Specifications MCQs Part 3

1. For design purpose, the moment at the support where two unequal spans or spans not equally loaded meet, is

A.
lesser value
B.
greater value
C.
average of two values
D.
none of these.

2. As per IS : 800-1982, the coefficient of expansion for steel per degree centigrade per unit length, is

A.
0.000011
B.
0.000012
C.
0.000013
D.
0.000014

3. When bending occurs about both axes of the member, the value of fbe in the formula |> 1 is taken

A.
higher value
B.
lower value
C.
sum of the two
D.
difference of the two.

4. The flat slab is a reinforced concrete slab with or without drops and is supported

A.
B.
C.
on beams
D.
None of these.

5. The ratio of the effective length to the least radius of gyration of a tie member of a roof truss, which gets subjected to reversal of stress shall not exceed

A.
180
B.
200
C.
240
D.
350

6. The value of E for allowable compressive stress for columns, in the formula is taken as

A. 2000000 kg/cm2
B. 2044000 kg/cm2
C. 2045000 kg/cm2
D. 2047000 kg/cm2

7. The structure which is subjected to an imposed load after 72 hours for a period of 24 hours, is deemed to be unacceptable if it fails to recover the net deflection less than

A. 90%
B. 85%
C. 80%
D. 75%

8. The pitch of transverse reinforcement of a column is taken as

A. least lateral diamension of the compression member
B. sixteen times the smallest diameter of the longitudinal reinforcement of the column
C. forty eight times the diameter of the transverse reinforcement
D. least value of the above.

9. The pH value of water to be used in concrete shall generally be

A. not more than 7
B. not less than 6
C. not less than 5
D. not more than 6

10. Pick up the correct statement applicable to cased columns.

A. Single I-beam or channels back with or without flange plates may be used
B. The overall dimensions of the steel section do not exceed 750 x 450 mm over plate if used
C. The column is unpainted and is solidly encased in ordinary dense concrete with 10 mm aggregates having a minimum of cube strength 160 kg/cm2 at 28 days
D. The surface and edges of the steel column should be provided a concrete cover not less than 50 mm
E. All the above.

11. M 30 grade concrete means, its compressive strength of 15-cm cube, is 30 N/mm2 after

A. 3 days
B. 7 days
C. 21 days
D. 28 days

12. If the ratio of effective span to overall depth of a simply supported beam is less than 1, the lever arm is

A. 0.3l
B. 0.4l
C. 0.5l
D. 0.6l

13. If the ends of the compression flanges of simply supported girders are fully restrained against lateral bending, the effective length is taken as

A. span
B. 0.85 x span
C. 0.7 x span
D. 0.5 x span

14. The individual part of the structures is subjected to a load test for 24 hours by applying a load equal to full dead load of the structure plus

15. The width of lacing bars in mm is kept

A. equal to nominal rivet diameter
B. twice the nominal rivet diameter
C. thrice the nominal rivet diameter
D. maximum of the above rounded to nearest 5 mm.

16. Pick up the correct statement from the following:

A. The cover of a longitudinal reinforcing bar in a column is kept not less than the diameter of the bar or 40 mm
B. The cover of a longitudinal reinforcing bar in beam is kept not less than the diameter of the bar or 25 mm
C. The end cover of a longitudinal reinforcing bar in a beam is kept not less than twice the diameter or 25 mm
D. The cover for tensile reinforcement in a slab is kept not less than diameter of the bar or 15 mm
E. All the above

17. The minimum thickness of the web plate for a crane gantry plate girder with a lifting load exceeding 15 tonnes, is

A. 4 mm
B. 5 mm
C. 6 mm
D. 8 mm

18. The greater clear dimension of web of thickness't' should not exceed

A. 180 t
B. 200 t
C. 240 t
D. 270 t

19. The thickness of the rectangular plate for the cap or base of a solid round steel columns, is calculated from the formula where d is

A. the reduced diameter of the column
B. the dimension of the base
C. the diameter of the base
D. the diameter of the top.

20. For under water concreting.

A. at least 10 percent more cement is required as compared to dry conditions
B. the volume of coarse aggregates shall not be less than one and half times and not more than twice that of fine aggregate
C. the slump should not be less than 100 mm and not more than 180 mm
D. dewatering by pumping is not done or until 24 hours thereafter
E. All the above

21. Creep of concrete is assumed proportional to the stress if the stress does not exceed .......of the characteristic compressive strength

A. 15%
B. 20%
C. 25%
D. 33%
E. 50%

22. The characteristic strength of concrete is the strength of material if its test result is not less than

A. 2%
B. 3%
C. 4%
D. 5%
E. 10%

23. Pick up the correct statement from the following:

A. Flange joints are preferably located at points of maximum stress
B. The area of splice plates should be 5% in excess of flange elements spliced
C. The C.G. of the flange splice should coincide with that of the element spliced
D. For welding flange splice, complete penetration butt welds should be used
E. None of these.

24. If a and b are the sides of a square column and its base, the thickness of the base may be calculated from the formula

A.
B.
C.
D.

25. The minimum length of the side or diameter of the column base shall not be less than (where d is the minimum diameter of the column).

A. (d + 75) mm
B. 1.2 (d - 75) mm
C. 1.5 (d + 75) mm
D. 1.6 (d + 75) mm

26. The thickness of flat double lacing, is taken (where l is the effective length of the bar).

A.
B.
C.
D.
E.

27. Minimum thickness of steel work directly exposed to weather but not accessible for cleaning and repainting, the thickness should be not less than

A. 4 mm
B. 6 mm
C. 7 mm
D. 8 mm

28. The side face reinforcement is provided if the depth of the web of a beam exceeds

A. 600 mm
B. 650 mm
C. 700 mm
D. 750 mm
E. 800 mm

29. The staggered pitch is the distance between two consecutive rivets measured

A. parallel to the direction of stress in the member
B. perpendicular to the direction of stress in the member
C. diagonally
D. none of these.

30. For nominal mix concrete M 20, the required quantity of water per 50 kg. of cement, is

A. 60 litres
B. 45 litres
C. 34 litres
D. 30 litres

31. The ratio of the lacing bars for compression members shall not exceed

A. 80
B. 120
C. 145
D. 200

32. Four reinforcing bars of 30 mm diameter each, are bundled in contact. The lower two bars extend up to end supports. The distance between the points of termination of the upper bars, is kept

A. zero
B. 1.2 m
C. 0.9 m
D. 0.75 m

33. If b is the width of a beam, x is the spacing of the stirrup and fc is the characteristic strength of stirrups, the minimum cross sectional area of stirrup legs, should be equal or greater than

A.
B.
C.
D.

34. The maximum spacing of shear reinforcement should not exceed 0.75 d subject to a minimum of

A. 300 mm
B. 350 mm
C. 400 mm
D. 450 mm
E. 500 mm

35. The development length of each bar of three bars bundled together is increased by

A. 10%
B. 20%
C. 33%
D. 50%

36. The actual length of a column provided with a cap and base, is the distance between

A. top of the base and underside of the cap
B. bottom of the base and underside of the cap
C. top of the base and top of the cap
D. bottom of the base and top of the cap.

37. The maximum bending moment in a purlin of length L when subjected to a distributed load ω, is assumed

A.
B.
C.
D.

38. A column of rectangular section is considered short, if both the slenderness ratios are less than

A. 8
B. 10
C. 12
D. 16

39. The tolerances for the form work of columns and beams range from

A. - 3 mm to + 6 mm
B. - 4 mm to + 8 mm
C. - 6 mm to + 12 mm
D. - 8 mm to + 12 mm

40. The effective length of lacing is the distance

A. between the inner end rivets of the bar for single lacing
B. 0.7 of the distance between the inner end rivets of the bar for double lacing
C. between the inner ends of effective lengths of welds connecting the members
D. 0.7 of the distance stated in (c)
E. all the above.

41. The total area of side face reinforcement, in case of a deep beam should not be less than

A. 0.1% of web area
B. 0.2% of web area
C. 0.3% of web area
D. 0.4% of web area.

42. As per IS : 1982, the permissible axial tension in rolled I-beams and channels, is

A. 1500 kg/cm2
B. 1800 kg/cm2
C. 1400 kg/cm2
D. 1420 kg/cm2

43. The thickness of flat single lacing is, taken (where l is effective length of the bar).

A.
B.
C.
D.
E.

44. The average 28 days compressive strength of at least three 15 cm concrete cubes prepared with available water as compared to the average strength of three similer concrete cubes prepared with distilled water, should be at least

A. 70%
B. 80%
C. 90%
D. 95%

45. In the formula

A. A and B are the dimensions of the column
B. A and B are the dimensions of the base plate
C. A is the greater projection of the plate beyond the column
D. B is the lesser projection of the plate beyond the column
E. Both (c) and (d) of above.

46. For deformed reinforcing bars, the permissible design bond stress may be increased by

A. 20%
B. 30%
C. 40%
D. 50%
E. 60%

47. The maximum pitch of rivets for compression and tension members should not exceed

A. 32 t
B. 200 mm
C. 40 t
D. 300 mm
E. both (a) and (d)

48. Minimum diameter of the lateral ties should not be less than

A. 4 mm
B. 5 mm
C. 6 mm
D. 10 mm

49. If fbt and fs are the numerical values of bending tension and shear stresses, the equivalent stress fe, is

A.
B.
C.
D.

50. The ratio of the effective lengths of two columns, one effectively held in position at one end and partially restrained at the other end, and the other effectively held in position at one end and free at the other end, is

A.
B.
C.
D.