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6th Diploma Exam/Civil/5130/May 2018

**Duration: 3Hrs. M.Marks:75**

**Note: Use of IS: 800 and Steel Tables are permitted in examination.**

**SECTION-A**

**Q1. a) Fill in the blanks. 15×1=15**

- ISSQ means
__Indian Standard Square Bars.__ - ISLC standsfor
__Indian Standard Light Channels.__ - Rivets in double cover butt joints are in
**double.** - Lap, Tee or corner joints required
__fillet__ - Members subjected to direct tension are called
**T****ension**__member.__ - In compression members
**gross**area of section is used. - A truss is usually loadedatthe
**joint**of its member. - Bending stress at the neutral axis is
**Zero**. - The strength of beam is depends upon
**S****ection Modulus**. - Long columns fail due to
**Buckling.**

- Riveted butt joints have no coverplates.
**(False)** - Welding requires skilled labour.
**(True)** - In tension members, strength depends upon the grossarea.
**(False)** - Compression member of a crane is calledboom.
**(True)** - In design of beams clear span is used forcalculations.
**(False)**

- What are the type of failures occur in riveted joint?
- Explain the advantages and disadvantages of welded joint?
- What do you mean by structural steel? Explain its properties.
- What are the different cases by which we can find the net area of the tension members?
- Define i) Radius of gyration ii) slenderness ratio iii) effective length
- Draw a neat sketch showing various parts of roof truss.
- Differentiate between long and short columns.
- What are the assumptions made with theory of simple bending?
- Write a short note on precautions to be taken for the erection of steel structures.

- A double riveted cover butt joint is used for connecting two plates of 12 mm thickness. The diameter of the rivets is 22 mm. Calculate the necessary pitch and efficiency of the joint.Use PDSR. (τ
_{vf}=100 N/mm^{2},σ_{pf}=300N/mm^{2}.) - SA 75 X 50 X 10 mm is to be connected to a gusset plate by 6 mm fillet weld. The load tobe transmitted is 160 kN. Design the weld, Take τ
_{vf}=102.5N/mm - Design the double angle member if the angles are placed back to back with their longer legs connected on the same side of the gusset plate. The tension member is subjected to a pull of210 kN. Use 16mm PDSR,
^{.,}τ_{vf}=100 N/mm^{2}, σ_{pf}=300N/mm^{2}, σ_{at}=150N/mm^{2}.

- A simply supported beam carries a superimposed load of 3 kN/m on a clear span of 6.5 m. Design the beam section if the beam is laterally supported along its span.
- A single strut ISA 65X65X8mm ofaro of truss is1.36mlong.It is connected by one rivet a teach end. Calculate the safe load, the strut can carry. Refer steel table for stresses etc.

6th Diploma/Civil/5130/May 2019

According to IS 800:1984, Maximum Permissible tensile stress in Steel Sections is ______× fy.

According to IS 800:1984, Maximum Permissible tensile stress in Steel Sections is 0.6× fy.

In IS 800: 1984, Symbol fy represents ____________ stress in Steel.

In IS 800: 1984, Symbol fy represents__ minimum yield __stress in Steel.

For 28mm diameter rivet, the diameter of rivet hole will be ________

For 28mm diameter rivet, the diameter of rivet hole will be** 28+2=30mm**.

Sectional area of “ISLC 150 @ 141.3 N/m” is _______ mm²

Sectional area of “ISLC 150 @ 141.3 N/m” is **1836** mm².

For 75° Fusion Angle the Effective throat thickness of 6mm welds is ____ mm.

For 75° Fusion Angle the Effective throat thickness of 6mm welds is **2** mm.

Maximum pitch in rivets shall not exceed _______.

Maximum pitch in rivets shall not exceed **30t or 300mm.**

Increase in carbon content in steel cause _________.

Increase in carbon content in steel cause **decrease ductility**.

ΣV = 0, ΣH = 0 and ΣM = 0 are called ________.

ΣV = 0, ΣH = 0 and ΣM = 0 are called **equations of equilibrium.**

In plate girder Bearing stiffeners are provided at ________.

In plate girder Bearing stiffeners are provided at **the support**.

Zero bending stress occurs at _________ of Beam.

Zero bending stress occurs at **neutral axis** of Beam.

**(True)**

For Power Driven Shop Rivets (PDSR) allowable shear stress is 100N/mm².

**(True)**

Minimum Pitch Distance in Rivets shall be two times of rivet.

**(False)**

Brittle Failure is not possible in Welding.

**(False)**

Strut is a member subjected to an axial Pull.

**(False)**

6th Diploma Exam/Civil/5130/May 2019 PSBTE Diploma Solved Paper May 2019 .

6th Diploma /Civil/5130/May 2019

Lap Joint, Single Cover Butt Joint & Double cover Butt Joint with Riveted Connections.

Calculate minimum numbers of rivets required to connect a 14mm thick steel flat with a 12mm thick gusset plate to support an axial pull of 230kN for shop fabrication. Also Specify Diameter of Rivets.

What are purlins ?

Purlins

Differentiate between Clear Span, Effective Span & Total span of a beam with the help of sketches.

What are disadvantages of welding?

Disadvantages of welding

What are laterally restrained beams? Explain with Sketches ?

beams

How depth of Masonry wall foundation is decided?

6th Diploma/Civil/5130/May 2019 Click Here

6th Diploma/Civil/5130/May 2019

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6th Diploma/Civil/5130/May 2019

Design a simply supported beam of span 4.0 m to carry a superimposed load of 55 kN/m inclusive of its self-weight. The beam is laterally restrained throughout its length.(Assume missing Data)

Write about various components of Roof Trusses.

Various components of Roof Trusses.

Design a Single angle discontinue strut of 2.0 m length to carry an axial compressive load of 100 kN. With welded end connection using 10mm gusset plate

Design a 2.5m long Single angle section to act as tension member subjected to a tensile load of 160kN. With Shop Riveted (PDSR) Connections at end. Assume thickness of gusset.

Calculate the efficiency of Joint shown in Figure A. for shop Fabrication.

6th Diploma/Civil/5130/May 2019

**Duration: 3Hrs. M.Marks:75**

**Note: Use of IS: 800 and Steel Tables are permitted in examination.**

**SECTION-A**

**Q1. a) Fill in the blanks. 15×1=15**

- According to IS 800:1984, Maximum Permissible tensile stress in Steel Sections is
**0.**× fy.__6__ - In IS 800: 1984, Symbol fy represents
**minimum yield**stress in Steel. - For 28mm diameter rivet, the diameter of rivet hole will be
**28+2=30mm**. - Sectional area of “ISLC 150 @ 141.3 N/m” is
**1836**mm². - For 75° Fusion Angle the Effective throat thickness of 6mm welds is
**2**mm. - Maximum pitch in rivets shall not exceed
**30t or 300mm.** - Increase in carbon content in steel cause
**decrease ductility**. - ΣV = 0, ΣH = 0 and ΣM = 0 are called
**equations of equilibrium.** - In plate girder Bearing stiffeners are provided at
**the support**. - Zero bending stress occurs at
**neutral axis**of Beam.

##### b) State True or False.

- Beam is a flexural Member.
**(True)** - For Power Driven Shop Rivets (PDSR) allowable shear stress is 100N/mm².
**(True)** - Minimum Pitch Distance in Rivets shall be two times of rivet
**(False)** - Brittle Failure is not possible in Welding.
**(False)** - Strut is a member subjected to an axial Pull.
**(False)**

- Beam is a flexural Member.

- Draw neat and labeled sketches of Lap Joint, Single Cover Butt Joint & Double cover Butt Joint with Riveted Connections.
- Calculate minimum numbers of rivets required to connect a 14mm thick steel flat with a 12mm thick gusset plate to support an axial pull of 230kN for shop fabrication. Also Specify Diameter of Rivets.
- Write the steps to design an axially loaded Column.
- What are purlins?
- Differentiate between Clear Span, Effective Span & Total span of a beam with the help of sketches.
- What are disadvantages of welding?
- What are laterally restrained beams? Explain with Sketches ?
- How depth of Masonry wall foundation is decided?

- Design a simply supported beam of span 4.0 m to carry a superimposed load of 55 kN/m inclusive of its self-weight. The beam is laterally restrained throughout its length.(Assume missing Data)
- Write about various components of Roof Trusses (Minimum Ten).
- Design a Single angle discontinue strut of 2.0 m length to carry an axial compressive load of 100 kN. With welded end connection using 10mm gusset plate. (Assume missing Data)
- Design a 2.5m long Single angle section to act as tension member subjected to a tensile load of 160kN. With Shop Riveted (PDSR) Connections at end. Assume thickness of gusset.
- Calculate the efficiency of Joint shown in
**Figure A**. for shop Fabrication.