Important Questions on Design of Steel Structures - Set 12 - ObjectiveBooks

# Practice Test: Question Set - 12

1. If fbt and fc are the co-existent bending tensile stress and shear stress in a member, the equivalent stress fc is
(A) √(fbt2 + fc2)
(B) √(fbt2 + ½fc2)
(C) √(fbt2 + 3fc2)
(D) √(fbt2 - 3fc2)

2. According to IS: 800, in the Merchant Rankine formula the value of imperfection index (n) is
(A) 1.0
(B) 1.4
(C) 1.8
(D) 2.0

3. 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

4. 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) All the above

5. Minimum thickness of web in a plate girder, when the plate is accessible and also exposed to weather, is
(A) 5 mm
(B) 6 mm
(C) 8 mm
(D) 10 mm

6. 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

7. Long column is one
(A) Which is more than 3 m long
(B) Whose lateral dimension is less than 25 cm
(C) Which is free at its top
(D) Which has a ratio of effective length and least lateral dimension more than 15

8. To minimize the total cost of a roof truss, the ratio of the cost of truss to the cost of purlins shall be
(A) 1
(B) 2
(C) 3
(D) 4

9. 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

10. In factory buildings, the horizontal beams spanning between the wall columns supporting a wall covering, are called
(A) Stringers
(B) Trimmers
(C) Girts
(D) Lintels

11. The minimum thickness of plates in a steel stack should be
(A) 4 mm
(B) 5 mm
(C) 6 mm
(D) 8 mm

12. 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) < L/3
(B) < L/6
(C) > L/3
(D) > L/6

13. A structural member subjected to tensile force in a direction parallel to its longitudinal axis, is generally known as
(A) A tie
(B) A tie member
(C) A tension member
(D) All the above

14. Compression force in two end posts, the pin of a rocker bearing in a bridge is designed for
(A) Bearing and shear
(B) Bending and shear
(C) Bearing and bending
(D) Bearing, shear and bending

15. According to the Unwin's formula, if ‘t’ is thickness of the plate in mm, 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

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