B.TECH - Semester 6 design of machine elements i Question Paper 2020 (sep)
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- A simply supported beam has a concentrated load at the centre which fluctuates from a value of P to 4 P . The span of the beam is 500 mm and its cross-section is circular with a diameter of 60 mm . Taking for the beam material an ultimate stress of 700 MPa , a yield stress of 500 MPa , endurance lim...
- Which plane is subjected to maximum shear stress in case of parallel fillet weld?
- List out methods for reducing stress concentration in machine parts.
- Define the term surge in springs. ( $\mathbf{1 0} \boldsymbol{\times} \mathbf{4} \boldsymbol{=} \mathbf{4 0}$ Marks) PART - B Module - I
- Design a helical compression spring for a spring loaded safety valve for the following data Operating pressure $=1.5 \mathrm{MPa}$ Maximum pressure when the valve blows off freely $=1.1 \mathrm{MPa}$ Maximum lift of the valve when the pressure is $1.1 . \mathrm{Mpa}=6 \mathrm{~mm}$ Diameter of the ...
- The load on a bolt consists of an axial pull of 10 kN together with a transverse shear force of 5 kN . Find the diameter of bolt required according to (a) Maximum principal stress theory;
- The load on a bolt consists of an axial pull of 10 kN together with a transverse shear force of 5 kN . Find the diameter of bolt required according to (b) Maximum shear stress theory. Take permissible tensile stress at elastic limit $=100 \mathrm{MPa}$. OR
- Enumerate the various factors that affect selection of materials in machine design.
- Differentiate between ductile and brittle failure in engineering materials.
- List out commonly used types of keys and its application.
- Explain dilation of pressure vessels.
- What are the causes of residual stresses in welded joints? How they are relieved?
- State the advantages of hollow shaft over solids shafts in power transmission.
- For the welded bracket shown in the figure, find the load carrying capacity if the weld size is 10 mm and allowable stress in the weld are 96 MPa in tension and 72 MPa in shear OR
- Design and draw a cast iron flange coupling for a mild steel shaft transmitting 90 kW at $250 \mathrm{r} . \mathrm{p} . \mathrm{m}$. The allowable shear stress in the shaft is 40 MPa and the angle of twist is not to exceed $1^{\circ}$ in a length of 20 diameters. The allowable shear stress in the co...
- A shaft supported at the ends in ball bearings carries a straight tooth spur gear at its mid span and is to transmit 7.5 kW at $300 \mathrm{r} . \mathrm{p} . \mathrm{m}$. The pitch circle diameter ofthe gear is 150 mm . The distances between the centre line of bearings and gear are 100 mm each. If t...
- Define Endurance limit of a material.
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