Civil Engineering - Steel Structure Design MCQs Part 3

1. Diameter of a rivet hole is made larger than the diameter of the rivet by

A.
1.0 mm for rivet diameter upto 12 mm

B.
1.5 mm for rivet diameter exceeding 25 mm

C.
2.0 mm for rivet diameter over 25 mm

D.
none of these.

 Answer Option C

2. Number of rivets required in a joint, is

A.

B.

C.

D.

E.
none of these.

 Answer Option D

3. When a tension member consists of two channel sections, the allowance for rivet hole is made for two holes from

A.
each web

B.
each flange

C.
both webs

D.
each web or one hole from each flange whichever is more

E.
each web or one hole from each flange whichever is less.

 Answer Option E

4. If d is the distance between the flange angles, the vertical stiffeners in plate girders without horizontal stiffeners, are spaced at a distance not less than

A.
0.15 d

B.
0.22 d

C.
0.33 d

D.
0.44 d

 Answer Option C

5. A column splice is used to increase

A.
length of the column

B.
strength of the column

C.
cross-sectional area of the column

D.
none of these.

 Answer Option A

6. If W and L are the total superimposed load and the span of a plate girder in metres, the approximate self weight (W) of the girder, is taken as

A.

B.

C.

D.

E.

 Answer Option C

7. If d is the clear depth of a plate girder, t is the minimum required thickness of the web, C is the maximum clear distance between vertical stiffeners, the moment of inertia of a pair of stiffeners about the centre line of the web, is

A.

B.

C.

D.

 Answer Option A

8. The ratio of the span L of the filler joists to the depth d from the under side of the joist to the top of the structural concrete, should not exceed

A. 60

B. 45

C. 35

D. 25

E. 20

 Answer Option C

9. The maximum tensile and compressive bending stress in extreme fibres of rolled I-sections and channels on the effective section, is

A. 1500 kg/cm2

B. 1420 kg/cm2

C. 1650 kg/cm2

D. 2285 kg/cm2

 Answer Option C

10. Perforated cover plates are particularly suitable for built up sections consisting of

A. channels placed back to back

B. channels placed toe to toe

C. four angle box section

D. all the above.

 Answer Option C

11. The tensile strength of mild steel for bolts and nuts should not be less than

A. 32 kg/mm2

B. 36 kg/mm2

C. 40 kg/mm2

D. 44 kg/mm2

 Answer Option D

12. A riveted joint may experience

A. shear failure

B. shear failure of plates

C. bearing failure

D. bearing failure of rivets

E. all the above.

 Answer Option E

13. With a percentage increase of carbon in steel, decreases its

A. strength

B. hardness

C. brittleness

D. ductility.

 Answer Option D

14. In a built up beam actual bending compressive stress fbc is given by (when y1 is the distance of the edge of the beam from the neutral axis).

A.

B.

C.

D.

E.

 Answer Option A

15. In double lacing, the thickness t of flat lacing is

A. t < 1/40 th length between inner end rivets

B. t < 1/50 th length between inner end rivets

C. t < 1/60 th length between inner end rivets

D. t < 1/70 th length between inner end rivets

E. none of these.

 Answer Option C

16. When the length of a tension member is too long

A. a wire rope is used

B. a rod is used

C. a bar is used

D. a single angle is used.

 Answer Option C

17. An imaginary line along which rivets are placed, is known as

A. rivet line

B. scrieve line

C. back line

D. gauge line

E. all the above.

 Answer Option E

18. The allowable stress in axial tension is generally kept less if thickness of the member is more than

A. 10 mm

B. 12 mm

C. 15 mm

D. 20 mm

E. 22 mm

 Answer Option D

19. The maximum permissible slenderness ratio of compression member carrying dead and superimposed load, is

A. 180

B. 200

C. 250

D. 300

E. 350

 Answer Option A

20. The safe working pressure for a spherical vessel 1.5 m diameter and having 1.5 cm thick wall not to exceed tensile stress 50kg/cm2 , is

A. 16 kg/cm2

B. 18 kg/cm2

C. 20 kg/cm2

D. 22 kg/cm2

 Answer Option C

21. Lug angle is

A. used with single angle member

B. not used with double angle member

C. used with channel member

D. all the above.

 Answer Option D

22. Effective length of a column effectively 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

23. A riveted joint many experience

A. tearing failure of plates

B. bearing failure of plates

C. splitting failure of plates at the edges

D. bearing failure of rivets

E. all the above.

 Answer Option E

24. If a pair of angles placed back to back in tension are connected by one leg of each angle, the net effective area of the section, is

A.

B.

C.

D.

E. none of these.

 Answer Option D

25. IS : 800 - 1971 recommends that in a splice plate the number of rivets carrying calculated shear stress through a packing greater than 6 mm thick, is to be increased by 2.5% for every

A. 1.00 mm thickness of packing

B. 1.50 mm thickness of packing

C. 2.0 mm thickness of packing

D. 2.50 mm thickness of packing

E. 3.0 mm thickness of packing.

 Answer Option C

26. To keep the intensity of bearing pressure between the column base and concrete, compressive throughout the length of the column base, the ratio of the moment M to axial load P should be

A.

B.

C.

D.

E.

 Answer Option B

27. When the upper column does not provide full bearing area over lower column, the column splice is provided with the following assumption

A. bearing plate is assumed as a short beam to transmit the axial load to the lower column section

B. axial load is assumed to be taken by flanges

C. load transmitted from the flanges of upper column and reactions from the flanges of lower columns are equal and form a couple

D. all the above.

 Answer Option D

28. For a steel member of slenderness ratio 350, the allowable stress is 76 kg/cm2 if it is

A. HTW grade of thickness exceeding 32 mm

B. HT grade of thickness exceeding 45 mm

C. HT grade of thickness not exceeding 45 mm

D. All the above.

 Answer Option D

29. The permissible stress to which a structural member can be subjected to, is known as

A. bearing stress

B. working stress

C. tensile stress

D. compressive stress

E. all the above.

 Answer Option B

30. If M is the moment due to a couple in a bearing plate whose width is b and allowable bending stress is P, the thickness (t) of the bending plate of the column splice, is

A.

B.

C.

D.

E.

 Answer Option B

31. Tacking rivets in compression plates not exposed to the weather, have a pitch not exceeding 300 mm or

A. 16 times the thickness of outside plate

B. 24 times the thickness of outside plate

C. 32 times the thickness of outside plate

D. 36 times the thickness of outside plate.

 Answer Option C

32. Effective length of a column effectively held in position and restrained in direction at one end but neither held in position nor restrained in direction at the other end, is

A. L

B. 0.67 L

C. 0.85 L

D. 1.5 L

E. 2 L

 Answer Option E

33. For columns whose slenderness ratio is upto 160, the secant formula for the determination of allowable stress, is

A.

B.

C.

D.

 Answer Option A

34. The effective length of a double angle strut with angles placed back to back and connected to both the sides of a gusset plate, by not less than two rivets, is

A. 0.5 L

B. 0.67 L

C. 0.85 L

D. L

E. 2 L

 Answer Option C

35. According to the Unwin's formula, if t is thickness of the plate in cm, the nominal diameter of the rivet, is

A. d = 1.91 t

B. d = 1.91 t2

C. d = 1.91 t

D. d = 1.91 t

E. d = 2.3 t

 Answer Option C

36. A single angle in tension is connected by one leg only. If the areas of connecting and outstanding legs are respectively a and b, net effective area of the angle, is

A.

B.

C.

D.

E. none of these.

 Answer Option B

37. The central deflection of a simply supported steel beam of length L with a concentrated load W at the centre, is

A.

B.

C.

D.

 Answer Option C

38. If L is the overall length of a combined footing having A as its area, d being the distance between the centre of gravity of the base and centre of the base, the larger width b is

A.

B.

C.

D.

 Answer Option B

39. On eccentrically loaded columns, the equivalent axial load may be obtained by

A. adding the axial load, eccentric load, the product of the bending moment due to eccentric load and the appropriate bending factor

B. adding the axial load and eccentric load and subtracting the product of bending moment and appropriate bending factor

C. dividing the sum of axial load and eccentric load by the product of the bending moment and appropirate bending factor

D. none of these.

 Answer Option A

40. The distance between the outer faces of flanges of a plate girder, is known as

A. overall depth

B. clear depth

C. effective depth

D. none of these.

 Answer Option A

41. To the calculated area of cover plates of a built-up beam, an allowance for rivet holes to be added, is

A. 10%

B. 13%

C. 15%

D. 18%

E. 20%.

 Answer Option B

42. The connection of one beam to another beam by means of an angle at the bottom and an angle at the top, is known as

A. unstiffened seated connection

B. stiffened seated connection

C. seated connection

D. none of these.

 Answer Option C

43. Allowable working stress corresponding to the slenderness ratio of double angles placed back to back and connected to one side of a gusset plate, is reduced to

A. 50%

B. 60%

C. 70%

D. 80%

E. 40%

 Answer Option D

44. Bulb angles are used in

A. column building

B. bridge building

C. ship building

D. water tank building.

 Answer Option C

45. Effective sectional area of a compression member is :

A. gross sectional area - area of rivet hole

B. gross sectional ares + area of rivet hole

C. gross sectional ares x area of rivet hole

D. gross sectional ares + area of rivet hole.

 Answer Option A

46. A fillet weld whose axis is parallel to the direction of the applied load, is known as

A. diagonal filler weld

B. end fillet weld

C. side fillet weld

D. all the above.

 Answer Option C

47. Assuming the values of maximum deviation ΔP and ΔE to be 25% of the computed value of P and E respectively, the minimum value of the factor of safety is

A. 1.00

B. 0.67

C. 1.67

D. 2.67

E. none of these.

 Answer Option C

48. In case horizontal stiffeners are not used, the distance between vertical legs of flange angles at the top and bottom of a plate girder, is known as

A. overall depth

B. clear depth

C. effective depth

D. none of these.

 Answer Option B

49. Rolled steel angle sections are classified as

A. equal angles

B. unequal angles

C. bulb angles

D. all the above.

 Answer Option D

50. Factor of safety is the ratio of

A. yield stress to working stress

B. tensile stress to working stress

C. compressive stress to working stress

D. bearing stress to working stress

E. bearing stress to yield stress.

 Answer Option A