Civil Engineering - Steel Structure Design MCQs Part 2

1. The effective length L of a simply supported beam with ends restrained against torsion, and also the ends of compression flange partially restrained against lateral bending, is given by

A.
L = span

B.
L = 0.85 span

C.
L = 0.75 span

D.
L = 0.7 span

E.
L = 1.25 span

 Answer Option B

2. Rolled steel beams are designated by Indian Standard series and its

A.
weight per metre and depth of its section

B.
depth of section and weight per metre

C.
width of flange and weight per metre

D.
weight per metre and flange width.

 Answer Option B

3. The spans are considered approximately equal if the longest span does not exceed the shortest span by more than

A.
5%

B.
10%

C.
15%

D.
20%

 Answer Option C

4. If the depth of the section of an upper column is smaller than the lower column

A.
filler plates are provided with column splice

B.
bearing plates are provided with column splice

C.
neither filler plates nor bearing plates are provided with column splice

D.
filler plates and bearing plates are provided with column splice

E.
none of these.

 Answer Option D

5. A tension member, if subjected to possible reversal of stress due to wind, the slenderness ratio of the member should not exceed

A.
180

B.
200

C.
250

D.
300

E.
350

 Answer Option E

6. An axial loaded column is supported on a slab base whose projection is 8 cm. If the intensity of pressure from concrete is 40 kg/cm2 and allowable bending stress in slab base is 1890 kg/cm2, the thickness (t) of the slab base, is

A.

B.

C.

D.

 Answer Option B

7. If P is the load applied to a bracket with an eccentricity e, the resisting moment F exerted by a rivet at a distance rn from the centre of gravity, is

A.

B.

C.

D.

E.

 Answer Option B

8. The effective length of a weld, is taken as the actual length

A. minus the size of weld

B. minus twice the size of weld

C. plus the size of weld

D. plus twice the size of weld

E. none of these.

 Answer Option B

9. The permissible bearing stress in steel, is

A. 1500 kg/cm2

B. 1890 kg/cm2

C. 2025 kg/cm2

D. 2340 kg/cm2

E. 2250 kg/cm2

 Answer Option B

10. The main assumption of the method of simple design of steel frame work, is :

A. beams are simply supported

B. all connections of beams, girders and trusses are virtually flexible

C. members in compression are subjected to forces applied at appropriate eccentricities

D. all the above.

 Answer Option D

11. Strengths of a rivet in single shearing, in bearing and in tearing are 3425 kg, 4575 kg and 5025 kg respectively. If the load in the member is 35 tonnes, the number of rivets required, is

A. 10

B. 11

C. 12

D. 13

E. 15

 Answer Option D

12. In a fillet weld placed on the sides of the base, the metal experiences

A. shear

B. tension

C. compression

D. bending

E. all the above.

 Answer Option E

13. The bending moment for filler joists at the middle of at intermediate span, is

A.

B.

C.

D.

E.

 Answer Option D

14. The Indian standard code which deals with steel structures, is

A. IS : 875

B. IS : 800

C. IS : 456

D. IS : 1893

 Answer Option B

15. When two plates are placed end to end and are joined by two cover plates, the joint is known as

A. lap joint

B. butt joint

C. chain riveted lap joint

D. zig-zag riveted lap joint

E. double cover butt joint.

 Answer Option E

16. The moment of the couple set up in a section of a beam by the logitudinal compressive and tensile force, is known as

A. bending moment

B. moment of resistance

C. flexural stress moment

D. none of these.

 Answer Option B

17. Pick up the correct statement from the following:

A. The minimum pitch should not be less than 2.5 times the gross diameter of the river

B. The minimum pitch should not be less than 12 times the gross diameter of the rivet

C. The maximum pitch should not exceed 10 times the thickness or 150 mm whichever is less in compression

D. All the above.

 Answer Option A

18. In a member subjected to an axial tensile force and bending moment, the maximum allowable stress in axial tension is ft and the maximum allowable bending stress in tension is fht. If ft and fht are their corresponding actual axial tensile and bending stresses, the relationship which holds goods is

A.

B.

C.

D.

 Answer Option B

19. A major beam in a building structure, is known as

A. a girder

B. a floor beam

C. a main beam

D. all the above.

 Answer Option D

20. Rolled steel Tee-sections are used

A. as columns

B. with flat strips to connect plates in steel rectangular tanks

C. as built up sections to resist axial tension

D. none of these.

 Answer Option B

21. A compression member consisting of angle sections may be a

A. continuous member

B. discontinuous single angle strut

C. discontinuous double angle strut

D. all the above.

 Answer Option D

22. The equivalent axial load is obtained from the fomula

A.

B.

C.

D.

E. none of these.

 Answer Option A

23. According to IS : 800-1962 the permissible bending stress in steel slab plates, is

A. 1500 kg/cm2

B. 1420 kg/cm2

C. 2125 kg/cm2

D. 1890 kg/cm2

 Answer Option D

24. A simply supported beam carrying a central load, will be safe in deflection if the ratio of its span to depth, is

A. < 19

B. < 24

C. > 19

D. > 24

E. > 37

 Answer Option B

25. For double angles carrying tension, placed back to back and connected to either side of the gusset plate, the sectional area of the section, is equal to cross sectional area of

A. the section

B. the section plus area of rivet holes

C. the section minus area of rivet holes

D. tthe section multiplied by the area of the rivet hole.

 Answer Option C

26. When a load is transferred through one surface to another surface in contact, the stress is known as

A. tensile stress

B. compressive stress

C. shearing stress

D. working stress

E. none of these.

 Answer Option E

27. The most commonly used sections in lateral system to carry shear force in built up columns, are

A. rolled steel flats

B. rolled angles

C. rolled channels

D. all the above.

 Answer Option D

28. If p and d are pitch and gross diameter of rivets, the efficiency (η) of the riveted joint, is given by

A.

B.

C.

D.

E.

 Answer Option C

29. For steel members not exposed to weather, the thickness of steel should not be less than

A. 4.5 mm

B. 6 mm

C. 8 mm

D. 10 mm

 Answer Option B

30. The minimum pitch of rivet holes of diameter d should not be less than

A. d

B. 1.25 d

C. 1.5 d

D. 2 d

E. 2.5 d

 Answer Option E

31. A long plate girder is subjected to a maximum bending moment M in which permitted allowable bending stress is fb. The economical depth de and the thickness of the web tw, is given by

A.

B.

C.

D.

E. none of these.

 Answer Option B

32. The beams supporting the steps of a stair are generally known as

A. headers

B. trimmers

C. stringers

D. spandrel beams.

 Answer Option C

33. In a grillage column footing maximum bending moment M occurs at the centre of grillage beams. Its value is (where P, L and a are axial load, length of the beam and length of the column base respectively).

A. M = P(L - a)

B.

C.

D.

E.

 Answer Option C

34. For a steel grillage footing to support two unequal column loads

A. line of action of the resultant of two column loads, is made to coincide with the centre of gravity of the base of the footing

B. trapezoidal shape is used for the base footing

C. projections of beams on either side in lower tier are such that bending moments under columns are equal

D. bending moment under the columns are kept equal to the bending moment between to two columns

E. all the above.

 Answer Option E

35. In case of cantilever fillers, the ratio of the span L to depth d, should not exceed

A. 4

B. 8

C. 12

D. 16

E. 20

 Answer Option C

36. The rivets which are heated and then driven in the field, are known

A. power driven shop rivets

B. power driven field rivets

C. hand driven rivets

D. cold driven rivets

E. field rivets.

 Answer Option B

37. The strength of a riveted lap joint is equal to its

A. shearing strength

B. bearing strength

C. tearing strength

D. least of (a), (b) and (c)

E. greatest of (a) (b) and (c).

 Answer Option D

38. The slenderness ratio of a column is zero when its length

A. is zero

B. is equal to its radius of gyration

C. is supported on all sides throughout its length

D. is between the points of zero moments.

 Answer Option C

39. If f is the maximum allowable bending stress in a tension member whose radius of gyration is r and depth is 2y, the required cross sectional area A is given by

A.

B.

C.

D.

E.

 Answer Option A

40. The main advantage of a steel member, is :

A. its high strength

B. its gas and water tightness

C. its long service life

D. all the above.

 Answer Option D

41. A 20 mm dia steel bar which is subjected to an axial tension of 2300 kg/cm2 produces a strain of 0.004 cm. If Young's modulus of steel is 2.1 x 106 kg/cm2, the bar is

A. in the elastic range

B. in the plastic range

C. at yield point

D. none of these.

 Answer Option A

42. Poisson's ratio for steel within elastic limit, ranges from

A. 0.15 to 0.20

B. 0.25 to 0.24

C. 0.25 to 0.33

D. 0.33 to 0.35

E. 0.45 to 0.50

 Answer Option C

43. For eccentrically loaded columns, the bending factor is

A.

B.

C.

D.

 Answer Option C

44. When a large value of radius of gyration is not required

A. channels are placed back to back

B. channel flanges are kept inward

C. channel flanges are kept outward

D. none of these.

 Answer Option B

45. The maximum axial load which is just sufficient to keep a column in a small deflected shape, is called

A. crippling load

B. buckling load

C. critical load

D. all the above.

 Answer Option D

46. If the slenderness ratio is greater than 160, the allowable stress in axial compression is multiplied by a factor (1.2 - (l/xy) where x is

A. 200

B. 400

C. 600

D. 800

E. 1000

 Answer Option D

47. The effective length of a compression member of length L, held in position and restrained in direction at both ends, is

A. L

B. 0.67 L

C. 0.85 L

D. 1.5 L

E. 2 L

 Answer Option B

48. Spans of continuous fillers are considered approximately equal if the longest span does not exceed the shortest span by more than

A. 5%

B. 10%

C. 15%

D. 20%

E. 25%

 Answer Option C

49. The gross diameter of a rivet is the diameter of

A. cold rivet before driving

B. rivet after driving

C. rivet hole

D. none of these.

 Answer Option B