1. Weldments in fabricated steel beams are designed for
(a) Bending stresses at the flange
(b) Shear stresses in transverse plane
(c) Combination of bending and shear
(d) None of these because in fabricated beams welds not to get stressed
(1 Mark, 1987)

Ans: c
2. If the ratio of the diameter of rivet hole to the pitch of rivets is 0.25, then the tearing efficiency of the joint is
(a) 0.50
(b) 0.75
(c) 0.25
(d) 0.87
(1 Mark, 1996)

Ans: b
3. The bolts in a rigid flanged coupling connecting two shafts transmitting power are subjected to
(a) Shear force and bending moment
(b) Axial force
(c) Torsion
(d) Torsion and bending moment
(1 Mark, 1996)

Ans: a
4. Bolts in the flanged end of pressure vessel are usually pretensioned. Indicate which of the following statements in NOT TRUE.
(a) Pretensioning helps to seal the pressure vessel.
(b) Pretensioning increases the fatigue life of the bolts.
(c) Pretensioning reduces the maximum tensile stress in the bolts.
(d) Pretensioning helps to reduce the effect of pressure pulsations in the pressure vessel.
(1 Mark, 1999)

Ans: c
5. In a bolted joint two members are connected with an axial tightening force of 2200 N. If the bolt used has metric threads of 4 mm pitch, the torque required for achieving the tightening force is
(a) 0.7 Nm
(b) 1.0 Nm
(c) 1.4 Nm
(d) 2.8 Nm
(2 Mark, 2004)

Ans: c
Torque = Tightening force \times \frac { Pitch }{ 2\pi }
=> T = F \times \frac { 0.004 }{ 2\pi } = 1.4 Nm
6. A 60 mm long and 6 mm thick fillet weld carries a steady load of 15 kN along the weld. The shear strength of the weld material is equal to 200 MPa. The factor of safety is
(a) 2.4
(b) 3.4
(c) 4.8
(d) 6.8
(2 Mark, 2006)

Ans: b
7. A bolted joint is shown below. The maximum shear stress, in MPa in the bolts at A and B, respectively are
(a) 242.6, 42.5
(b) 42.5, 242.6
(c) 42.5, 42.5
(d) 18.75, 343.64
(2 Mark, 2007)

Ans: a
Statement for Linked Answer Questions 8 and 9:
A steel bar of 10 × 50 mm is cantilevered with two M 12 bolts (P and Q) to support a static load of 4 kN as shown in the figure.
8. The primary and secondary shear loads on bolt P, respectively, are
(a) 2kN, 20kN
(b) 20kN, 2 kN,
(c) 20 kN, 0kN
(d) 0kN, 20 kN
(2 Mark, 2008)

Ans: a
9. The resultant shear stress on bolt P is closest to
(a) 132MPa
(b) 159 MPa
(c) 178 MPa
(d) 195 MPa
(2 Mark, 2008)

Ans: b
10. A bracket (shown in figure) is rigidly mounted on wall using four rivets. Each rivet is 6mm in diameter and has an effective length of 12mm. Direct shear stress (in MPa) in the most heavily loaded rivet is
(a) 4.4
(b) 8.8
(c) 17.6
(d) 35.2
(2 Mark, 2010)

Ans: b
Direct shear force \left( { F }_{ s } \right) =\frac { 1000 }{ 4 } = 250 N
Direct shear stress \left( \tau \right) =\frac { { F }_{ s } }{ A }
=> \tau =\frac { 250 }{ \pi { \left( 3\times { 10 }^{ 3 } \right) }^{ 2 } } = 8.8 MPa
11. A fillet welded joint is subjected to transverse loading F as shown in the figure. Both legs of the fillets are of 10 mm size and the weld length is 30 mm. If the allowable shear stress of the weld is 94 MPa, considering the minimum throat area of the weld, the maximum allowable transverse load in kN is
(a) 14.44
(b) 17.92
(c) 19.93
(d) 22.16
(2 Mark, 2012)

Ans: c
Common Data for Questions 12 and 13:
A single riveted lap joint of two similar plates as shown in the figure below has the following geometrical and material details.
Width of the plate w = 200 mm, thickness of the plate t = 5 mm, number of rivets n = 3, diameter of the rivet d_{r} = 10 mm, diameter of the rivet hole d_{h} = 11 mm, allowable tensile stress of the plate σ_{p} = 200 MPa, allowable shear stress of the rivet σ_{s} = 100 MPa and allowable bearing stress of the rivet σ_{c} = 150 MPa.
12. If the rivets are to be designed to avoid crushing failure, the maximum permissible load P in kN is
(a) 7.50
(b) 15.00
(c) 22.50
(d) 30.00
(2 Mark, 2013)

Ans: c
13. If the plates are to be designed to avoid tearing failure, the maximum permissible load P in kN is
(a) 83
(b) 125
(c) 167
(d) 501
(2 Mark, 2013)

Ans: c
14. For the three bolt system shown in the figure, the bolt material has shear yield strength of 200 MPa. For a factor of safety of 2, the minimum metric specification required for the bolt is
(a) M8
(b) M10
(c) M12
(d) M16
(2 Mark, 2014[2])

Ans: b
15. A bolt of major diameter 12 mm is required to clamp two steel plates. Cross sectional area of the threaded portion of the bolt is 84.3 mm^{2}. The length of the threaded portion in grip is 30 mm, while the length of the unthreaded portion in grip is 8 mm. Young’s modulus of material is 200 GPa. The effective stiffness (in MN/m) of the bolt in the clamped zone is _______.
(2 Mark, 2014[4])

Ans: 469
Stiffness of threaded portion:
{ k }_{ 1 } = \frac { { A }_{ 1 }E }{ { L }_{ 1 } }
= \frac { 84.3\times 200\times { 10 }^{ 3 } }{ 0.03 } = 562 MN/m
Stiffness of unthreaded portion:
{ k }_{ 2 } = \frac { { A }_{ 2 }E }{ { L }_{ 2 } }
= \frac { \pi \times { 6 }^{ 2 }\times 200\times { 10 }^{ 3 } }{ 0.08 } = 2826 MN/m
Effective stiffness:
\frac { 1 }{ k } = \frac { 1 }{ { k }_{ 1 } } +\frac { 1 }{ { k }_{ 2 } }
=> \frac { 1 }{ k } =\frac { 1 }{ 562 } +\frac { 1 }{ 2826 }
=> k \simeq 469 MN/m
16. A butt weld joint is developed on steel plates having yield and ultimate tensile strength of 500 MPa and 700 MPa, respectively. The thickness of the plates is 8 mm and width is 20 mm. Improper selection of welding parameters caused an undercut of 3 mm depth along the weld. The maximum transverse tensile load (in kN) carrying capacity of the developed weld joint is ___.
(2 Mark, 2014[4])

Ans: 70
17. A horizontal plate has been joined to a vertical post using four rivets arranged as shown in the figure. The magnitude of the load on the worst loaded rivet (in N) is _______.
(2 Mark, 2015[1])

Ans: 1839.83 N
18. A cantilever bracket is bolted to a column using three M12×1.75 bolts P, Q and R. The value of maximum shear stress developed in the bolt P (in MPa) is _____.
(2 Mark, 2015[3])

Ans: 332.6
19. A bolted joint has four bolts arranged as shown in figure. The cross sectional area of each bolt is 25 mm^{2}. A torque T = 200 Nm is acting on the joint. Neglecting friction due to clamping force, maximum shear stress in a bolt is ______ MPa.
(2 Mark, 2016[3])

Ans: 40
20. Consider a schematic of a riveted lap joint subjected to tensile load F, as shown below. Let d be the diameter of the rivets, and S_{f} be the maximum permissible tensile stress in the plates. What should be the minimum value for the thickness of the plates to guard against tensile failure of the plates? Assume the plates to be identical.
(a) \frac { F }{ { S }_{ f }\left( w2d \right) }
(b) \frac { F }{ { S }_{ f }w }
(c) \frac { F }{ { S }_{ f }\left( wd \right) }
(d) \frac { 2F }{ { S }_{ f }w }
(1 Mark, 2017[1]

Ans: a
We know, { S }_{ f }=\frac { F }{ A } =\frac { F }{ t\left( w2d \right) }
=> t=\frac { F }{ { S }_{ f }\left( w2d \right) }
21. A steel plate, connected to a fixed channel using three identical bolts A, B and C carries a load of 6 kN as shown in the figure. Considering the effect of direct load and moment, the magnitude of resultant shear force (in kN) on bolt C is
(a) 13
(b) 15
(c) 17
(d) 30
(2 Mark, 2017[2])

Ans: c
22. Pretensioning of a bolted joint is used to
(a) Strain harden the bolt head
(b) Decrease stiffness of the bolted joint
(c) Increase stiffness of the bolted joint
(d) Prevent yielding of the thread root
(1 Mark, 2018[2])

Ans: c