Exam Details
| Subject | Theory of Structures- I | |
| Paper | ||
| Exam / Course | Diploma in Civil Engineering (DCLE) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2015 | |
| City, State | new delhi, |
Question Paper
1. Choose the most appropriate answer from the following alternatives in each case:
The maximum permissible longitudinal pitch in a riveted joint in tension is
16 tor 200 mm whichever is less
4 100 mm
12 t or 200 m whichever is less
2·5 d
The efficiency of a riveted joint is the ratio of
Least strength of a riveted joint to the strength of the solid plate.
Least strength of a riveted joint to the greatest strength of the joint.
Greatest strength of the joint to the strength of the solid plate.
None of the above
The cross-section of a standard fillet weld is a triangle with base angles of
30° and 60°
40° and 50°
45° and 45°
35° and 45°
The weakest section in the computation of strength of a fillet weld is
Side perpendicular to the load axis
Side parallel to the load axis
Throat of the fillet weld
None of the above
The minimum thickness of steel members exposed to weather and accessible for painting shall not be less than
3 mm
5 mm
6 mm
8 mm
The maximum permissible slenderness ratio of steel tension members is
180
250
350
400
The effective length of a compression member of length effectively held in position at both' ends and restrained against rotation at one end is
0·65L
0·80L
1·2L
2·0L
A beam AB of span L is simply supported. Draw the influence line diagrams for the reactions RA, RB, maximum positive and negative shear force and bending moment for a section X which is at a distance of Z from the left hand support A.
Calculate the maximum positive and negative shear force at X of the beam mentioned above in question when a udl of4 kN/m and of length 3 m crosses the beam from left to right. Consider L as 12m and Z as 4 m.
Define a statically determinate and statically indeterminate structure.
Mention which of the structures shown below is statically determinate and which one is statically indeterminate and calculate the degree of redundancy in each case.
<img src='./qimages/15260-3b.jpg'>
State the moment area theorems.
4. Find the fixed end moments and the vertical support reaction for the beam shown below. Draw the B.M. and S.F. diagrams.
<img src='./qimages/15260-4.jpg'>
Determine the strength of a single riveted joint of 6 mm thick plates having 20 mm nominal dia. rivets at a pitch of 6 cm. Hand driven shop rivets are used and the yield stress of plates is 250 MPa. Permissible stresses in shearing and bearing for rivets are 80 MPa and 250 MPa respectively. Sketch the joint.
A single U-butt weld joins two plates of size 150 x 20 thick and 150 x 16 thick. Find the strength of the joint in tension assuming pennissible stress in the weld as 142 N/mm^2. Size of the plates is in mm.
6. Find the net effective area of an ISA 150 x 75 x 10 connected by its longer leg to a 12 mm gusset plate
by means of 5 mm fillet weld,
by means of 20 mm dia rivets (single hole)
7. Write short notes on any four of the following:
Types of riveted joint
Degree of redundancy
Distribution factors
Slenderness ratio of compression members
Loads on roof trusses
Stability of masonry dams
The maximum permissible longitudinal pitch in a riveted joint in tension is
16 tor 200 mm whichever is less
4 100 mm
12 t or 200 m whichever is less
2·5 d
The efficiency of a riveted joint is the ratio of
Least strength of a riveted joint to the strength of the solid plate.
Least strength of a riveted joint to the greatest strength of the joint.
Greatest strength of the joint to the strength of the solid plate.
None of the above
The cross-section of a standard fillet weld is a triangle with base angles of
30° and 60°
40° and 50°
45° and 45°
35° and 45°
The weakest section in the computation of strength of a fillet weld is
Side perpendicular to the load axis
Side parallel to the load axis
Throat of the fillet weld
None of the above
The minimum thickness of steel members exposed to weather and accessible for painting shall not be less than
3 mm
5 mm
6 mm
8 mm
The maximum permissible slenderness ratio of steel tension members is
180
250
350
400
The effective length of a compression member of length effectively held in position at both' ends and restrained against rotation at one end is
0·65L
0·80L
1·2L
2·0L
A beam AB of span L is simply supported. Draw the influence line diagrams for the reactions RA, RB, maximum positive and negative shear force and bending moment for a section X which is at a distance of Z from the left hand support A.
Calculate the maximum positive and negative shear force at X of the beam mentioned above in question when a udl of4 kN/m and of length 3 m crosses the beam from left to right. Consider L as 12m and Z as 4 m.
Define a statically determinate and statically indeterminate structure.
Mention which of the structures shown below is statically determinate and which one is statically indeterminate and calculate the degree of redundancy in each case.
<img src='./qimages/15260-3b.jpg'>
State the moment area theorems.
4. Find the fixed end moments and the vertical support reaction for the beam shown below. Draw the B.M. and S.F. diagrams.
<img src='./qimages/15260-4.jpg'>
Determine the strength of a single riveted joint of 6 mm thick plates having 20 mm nominal dia. rivets at a pitch of 6 cm. Hand driven shop rivets are used and the yield stress of plates is 250 MPa. Permissible stresses in shearing and bearing for rivets are 80 MPa and 250 MPa respectively. Sketch the joint.
A single U-butt weld joins two plates of size 150 x 20 thick and 150 x 16 thick. Find the strength of the joint in tension assuming pennissible stress in the weld as 142 N/mm^2. Size of the plates is in mm.
6. Find the net effective area of an ISA 150 x 75 x 10 connected by its longer leg to a 12 mm gusset plate
by means of 5 mm fillet weld,
by means of 20 mm dia rivets (single hole)
7. Write short notes on any four of the following:
Types of riveted joint
Degree of redundancy
Distribution factors
Slenderness ratio of compression members
Loads on roof trusses
Stability of masonry dams
Other Question Papers
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