Steel Design Sheet 21

1) Question.

When the load line conincides with the centre of gravity of the rivet group, then the rivets are subjected to
Answer.
- 1
  
  shear only
- 2
  
  tension only
- 3
  
  vending only
- 4
  
  both shear and tension
Answer: 1

Explanation:
2) Question.

A structural member carrying a pull of 700 kN is connected to a gusset plate using rivets. If the pulls required to shear the rivets, to crush the rivet and to tear the plate per pitch length are respectively 60 kN, 35 kN, and 70 kN, then the number of rivets required will be
Answer.
- 1
  
  12
- 2
  
  18
- 3
  
  20
- 4
  
  22
Answer: 3

Explanation:
3) Question.

Number of rivets required in a riveted joint is equal to
Answer.
- 1
  
  Force / Rivet value
- 2
  
  Force / Strength of rivet in shearing
- 3
  
  Force / Strength of rivet in bearing
- 4
  
  Force / Strength of plate in tearing
Answer: 1

Explanation:
4) Question.

If the thickness of plate is t mm and the nominal diameter of rivet is d mm, then accordig to Unwin's formula
Answer.
- 1
  
  $d = t \sqrt{6}$
- 2
  
  $d = 6 \sqrt{t}$
- 3
  
  $d = \sqrt{6 t}$
- 4
  
  d=6t
Answer: 2

Explanation:
5) Question.

If the thickness of thinnest plate is t, gross diameter of rivet is d, and the maximum permissible stress in bearing for the rivet is $σ_{b}$ , then the strength of a riveted joint against bearing of rivets per pitch length is equal to

[ Where n= Number of rivets per pitch length]
Answer.
- 1
  
  $n \times \frac{π d^{2}}{4} \times t \times σ_{b}$
- 2
  
  $n \times \frac{π d^{2}}{2} \times t \times σ_{b}$
- 3
  
  $n \times d \times t \times σ_{b}$
- 4
  
  $2 n \times d \times t \times σ_{b}$
Answer: 3

Explanation:
6) Question.

The strength of plate in tearing per pitch length is equal to

[ Where p= Pitch of the rivets, and $σ_{1}$ = Maximum permissible stress in tearing for the plate]
Answer.
- 1
  
  $p . t . σ_{1}$
- 2
  
  $p . d . σ_{1}$
- 3
  
  $(p - d) t . σ_{1}$
- 4
  
  $(p + d) t . σ_{1}$
Answer: 3

Explanation:
7) Question.

When the line of rivets does not lie in the direction of stress, the maximum pitch in a riveted joint should not exceed
Answer.
- 1
  
  12 t or 200 mm whichever is less
- 2
  
  16 t or 200 mm whichever is less
- 3
  
  24 t or 300 mm whichever is less
- 4
  
  32 t or 300 mm whichever is less
Answer: 4

Explanation:
8) Question.

Minimum pitch in a riveted joint should not be
Answer.
- 1
  
  less than 200 mm
- 2
  
  more than 200 mm
- 3
  
  greater than 2.5 times the gross diameter of the rivet
- 4
  
  less than 2.5 times the gross diameter of the rivet
Answer: 4

Explanation:
9) Question.

In designing a riveted joint, it is assumed that
Answer.
- 1
  
  load is uniformly distributed among all the rivets
- 2
  
  rivet hole is completely filled by the rivet
- 3
  
  friction between plates is neglected
- 4
  
  all of the above
Answer: 4

Explanation:
10) Question.

Rivet value is equal to
Answer.
- 1
  
  strength of a rivet in shearing
- 2
  
  strength of a rivet in bearing
- 3
  
  minimum of the value obtained in (a) and (b)
- 4
  
  maximum of the value obtained in (a) and (b)
Answer: 3

Explanation:

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