Civil Engineering - Steel Structure Design MCQs Part 4

1. Cold driven rivets range from

A.
6 to 10 mm in diameter

B.
10 to 16 mm in diameter

C.
12 to 22 mm in diameter

D.
22 to 32 mm in diameter

E.
none of these.

 Answer Option C

2. The main type of butt joints, is a double cover

A.
shear riveted joint

B.
chain riveted joint

C.
zig-zag riveted joint

D.
all the above.

 Answer Option D

3. Outstanding length of a compression member consisting of a channel, is measured as

A.
half of the nominal width

B.
nominal width of the section

C.
from the edge to the first row of rivets

D.
none of these.

 Answer Option B

4. The equivalent axial load may be defined as the load which produces a stress equal to

A.
maximum stress produced by the eccentric load

B.
maximum stressed fibre

C.
bending stress

D.
none of these.

 Answer Option A

5. If d is the distance between the flange angles of a plate girder, vertical stiffeners are provided at a distance not greater than

A.
d but not less than 0.20 d

B.
1.25 d but not less than 0.33 d

C.
1.5 d but not less than 0.33 d

D.
2.0 d but not less than 0.50 d

E.
2.5 d but not less than 0.50 d

 Answer Option C

6. The beam outside a wall upto floor level above it, is known as

A. rafter

B. purlin

C. spandrel beam

D. lintel

E. none of these.

 Answer Option C

7. A structural member subjected to tensile force in a direction parallel to its logitudinal axis, is generally known as

A. a tie

B. a tie member

C. a tension member

D. all the above.

 Answer Option D

8. For the economical design of a combined footing to support two equal column loads, the projections of beams in lower tier are kept such that bending moment under column is equal to

A. bending moment at the centre of the beam

B. half the bending moment at the centre of the beam

C. twice the bending moment at the centre of the beam

D. none of these.

 Answer Option A

9. In rolled steel beams, shear force is mostly resisted by

A. web only

B. flanges only

C. web and flanges together

D. none of these.

 Answer Option A

10. When plates are exposed to weather, tacking rivets are provided at a pitch in line not exceeding (where t is the thickness of the outside plate).

A. 8 t

B. 16 t

C. 24 t

D. 32 t

E. 48 t

 Answer Option B

11. The greatest gauge of long rivets should not exceed (where d is the diameter of the holes).

A. 2 d

B. 4 d

C. 6 d

D. 8 d

E. 10 d

 Answer Option D

12. Maximum permissible slenderness ratio of a member normally acting as a tie in a roof truss, is

A. 180

B. 200

C. 250

D. 300

E. 350

 Answer Option E

13. If d is the distance between the flange angles,

A. vertical stiffeners are provided in steel plate girders if the web is less than d/85

B. vertical stiffeners are provided in high tensile steel plate girders if the web is less than d/175

C. horizontal stiffeners are provided in high tensile girder steel plate if the web is less than d/180

D. horizontal stiffeners are provided in steel plate girders if the web is less than d/200

E. All the above.

 Answer Option E

14. The side thrust T on the tie rods provided at the end beam of jack arch of rise R, is calculated from the formula

A.

B.

C.

D.

 Answer Option C

15. When the depth of a plate girder is at least n times the depth of vertical leg of the flange angles, the girder is known as deep plate girder, if n is

A. 2

B. 4

C. 6

D. 8

E. 10

 Answer Option D

16. Stiffeners are used in a plate girder

A. to reduce the compressive stress

B. to reduce the shear stress

C. to take the bearing stress

D. to avoid buckling of web plate.

 Answer Option D

17. The channels get twisted symmetrically with regard to its axis

A. parallel to flanges

B. parallel to web

C. perpendicular to flanges

D. perpendicular to web.

 Answer Option B

18. The stiff portion of a bearing stiffener is taken equal to

A. depth of the beam

B. th depth of the beam

C. depth of the beam

D. depth of the beam.

 Answer Option D

19. Effective length of a column effectively held in position at both ends and restrained in direction at one end, is

A. L

B. 0.67 L

C. 0.85 L

D. 1.5 L

E. 2 L

 Answer Option C

20. The strength of ISA 125 = 75 x 10 mm used as a tie member with its longer leg connected at the ends by 27 mm diameter rivets, is

A. 26,000 kg

B. 26,025 kg

C. 26,050 kg

D. 26,075 kg

E. 27,000 kg

 Answer Option D

21. The gross section of the web of a beam is defined as

A. depth of the beam multiplied by its web thickness

B. width of the flange multiplied by its web thickness

C. sum of the flange width and depth of the beam multiplied by the web thickness

D. none of these.

 Answer Option A

22. If fbt and fc are the co-existent bending tensile stress and shear stress in a member, the equivalent stress fc is

A.

B.

C.

D.

 Answer Option C

23. For simply supported beams, the maximum permitted deflection, is

A. 1/325 of the span

B. 1/350 of the span

C. 1/375 of the span

D. 1/400 of the span

E. none of these.

 Answer Option A

24. In a truss girder of a bridge, a diagonal consists of mild steel flat 4001.S.F. and carries a pull of 80 tonnes. If the grossdiameter of the rivet is 26 mm, the number of rivets required in the splice, is

A. 6

B. 7

C. 8

D. 9

E. 12

 Answer Option C

25. Design of a riveted joint, is based on the assumption:

A. Load is uniformly distributed among all the rivets

B. Shear stress on a rivet is uniformly distributed over its gross area

C. Bearing stress is uniform between the contact surfaces of the plate and the rivet

D. Bearing stress in the rivet is neglected

E. All the above.

 Answer Option E

26. Pick up the correct statement from the following:

A. The steel beams placed in plain cement concrete, are known as reinforced beams

B. The filler joists are generally continuous over three-supports only

C. Continuous fillers are connected to main beams by means of cleat angles

D. Continuous fillers are supported by main steel beams

E. All the above.

 Answer Option D

27. When a column is subjected to eccentric load having eccentricity ex, with respect to x-axis and eccentricity ey with respect to y-axis the column is subjected to moment in two directions and the equivalent axial load, is

A.

B.

C.

D.

E. none of these.

 Answer Option A

28. The value of f.o.s 'm' in the formula for safe compressive stress for a column is taken as

A. 1.5

B. 1.6

C. 1.68

D. 1.88

 Answer Option C

29. Maximum permissible slenderness ratio of compression members which carry dead and superimposed load, is

A. 350

B. 250

C. 180

D. 80

E. 75

 Answer Option C

30. If the area of cross-section of a single angle discontinuous strut is 30 cm2 and allowable working stress corresponding to its slenderness ratio is 625 kg/cm2, the safe load carrying capacity of the member, is

A. 10 tonnes

B. 12 tonnes

C. 15 tonnes

D. 18 tonnes

E. 20 tonnes

 Answer Option C

31. According to I.S. : 800 - 1871, lacing bars resist transverse shear equal to

A. 1.0% of the axial load

B. 2.0% of the axial load

C. 2.5% of the axial load

D. 3.0% of the axial load

E. 4.0% of the axial load.

 Answer Option C

32. The greatest permissible clear dimension of the web of thickness t in the panel of a plate girder, is restricted to

A. 180 t

B. 220 t

C. 230 t

D. 260 t

E. 270 t

 Answer Option E

33. As per ISI, rolled steel beam sections are classified into

A. two series

B. three series

C. four series

D. five series.

 Answer Option D

34. Water pressure in a 80 cm water main is 10 kg/cm2. The minimum thickness of the metal required for the water main, not to be stressed more than 200 kg/cm2, is

A. 1 cm

B. 1.5 cm

C. 2 cm

D. 2.5 cm

E. 3 cm

 Answer Option C

35. In a tension member if one or more than one rivet holes are off the line, the failure of the member depends upon :

A. pitch

B. gauge

C. diameter of the rivet holes

D. all the above.

 Answer Option D

36. The size of a butt weld is specified by the effective throat thickness which in the case of incomplete penetration, is taken as

A. of the thickness of thicker part

B. of the thickness of thicker part

C. of the thickness of thinner part

D. of the thickness of thinner part

E. none of these.

 Answer Option D

37. The thickness of the web of a mild steel plate girder is less than d/200. If only one horizontal stiffener is used, it is placed at

A. the neutral axis of the section

B. 2/3rd of the depth of the neutral axis from the compression flange

C. 2/5th of the depth of the neutral axis from the compression flange

D. 2/5th of the height of the neutral axis from tension flange

E. none of these.

 Answer Option C

38. The load on a lintel is assumed as uniformly distributed if the height of the masonry above it, is upto a height of

A. the effective span

B. 1.25 times the effective span

C. 1.50 times the effective span

D. 2.0 times the effective span

E. 2.5 times the effective span.

 Answer Option B

39. Working shear stress on the gross area of a rivet as recommended by Indian Standards, is

A. 785 kg/cm2

B. 1025 kg/cm2

C. 2360 kg/cm2

D. none of these.

 Answer Option B

40. Pick up the correct statement from the following:

A. Loaded columns are supported on column bases

B. Column bases transmit the column load to the concrete foundation

C. Column load is spread over a large area on concrete

D. In column bases, intensity of pressure on concrete block is assumed to be uniform

E. All the above.

 Answer Option E

41. The ratio of hydrostatic stress to the volumetric strain within the elastic range, is called

A. modulus of elasticity

B. shear modulus of elasticity

C. bulk modulus of elasticity

D. tangent modulus of elasticity

E. all the above.

 Answer Option E

42. The deflection of beams may be decreased by

A. increasing the depth of beam

B. increasing the span

C. decreasing the depth of beam

D. increasing the width of beam

E. none of these.

 Answer Option A

43. For a cantilever beam of length L built-in at the support and restrained against torsion at the free end, the effective projecting length l is

A. l = 0.7L

B. l = 0.75L

C. l = 0.85L

D. l = 0.5L

E. l = L

 Answer Option B

44. In a built up section carrying a tensile force, the flanges of two channels are turned outward

A. to simplify the transverse connections

B. to minimise lacing

C. to have greater lateral rigidity

D. all the above

E. none of the above.

 Answer Option C

45. If P is the wind pressure in kg/cm2, v is the velocity in km/hour and K is a constant of proportionality, then

A. P = K/v2

B. v = K/P2

C. P = Kv2

D. P = Kv

 Answer Option C

46. Length of an outstanding leg of a vertical stiffener, may be taken equal to

A. th of clear depth of the girder plus 15 mm

B. th of clear depth of the girder plus 20 mm

C. th of clear depth of the girder plus 25 mm

D. th of clear depth of the girder plus 50 mm

E. th of clear depth of the girder plus 50 mm.

 Answer Option C

47. Efficiency of a riveted joint is defined as the ratio of

A. least strength of a riveted joint to the strength of solid plate

B. greatest strength of a riveted joint to the strength of solid plate

C. least strength of a riveted plate to the greatest strength of the riveted joint

D. all the above.

 Answer Option D

48. The stress in the wall of a thin cylinder subjected to internal pressure, is

A. hoop compression

B. shear

C. torsional shear

D. hoop tension.

 Answer Option D

49. The diameter of a bolt hole is taken as the nominal diameter of the bolt plus

A. 1.0 mm

B. 1.2 mm

C. 1.4 mm

D. 1.6 mm

E. 1.5 mm

 Answer Option D

50. Pick up the correct statement from the following:

A. Tacking rivets are used if the minimum distance between centres of two adjacent rivets exceeds 12 t or 200 mm, whichever is less

B. Tacking rivets are not considered to calculate stress

C. Tacking rivets are provided throughout the length of a compression member composed of two components back to back

D. All the above.

 Answer Option D