B.TECH - Semester 6 design of machine elements i Question Paper 2020 (jan)
Practice authentic previous year university questions for better exam preparation.
- 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...
- Explain surge in springs. How this call be avoided? ( $\mathbf{5} \boldsymbol{\times} \mathbf{4} \boldsymbol{=} \mathbf{2 0}$ Marks) Answer any one question from each Module, each carries 20 marks.
- Design a helical spring for a spring loaded safety valve for the following conditions. Diameter of valve seat $=65 \mathrm{~mm}$, Operating pressure $=0.7 \mathrm{~N} / \mathrm{mm}^{2}$, Maximum pressure when the valve blows off freely $=0.75 \mathrm{~N} / \mathrm{mm}^{2}$, Maximum lift of the valv...
- Write short note on distortion energy theory
- Explain the factors to be considered while designing machine parts to avoid fatigue failure.
- Explain the method of determining the size of the bolt when the bracket carries an eccentric load perpendicular to the axis of the bolt.
- What is an eccentric riveted joint? Explain the method adopted for designing such a Joint?
- A cylindrical shaft made of steel of yield strength 700 MPa is subjected to static loads consisting of bending moment $10 \mathrm{kN}-\mathrm{m}$ and a torsional moment $30 \mathrm{kN}-\mathrm{m}$. Determine the diameter of the shaft using maximum shear stress theory and maximum strain energy theory...
- A mild steel shaft transmits 20 kW at 200 rpm . It carries a central load of 900 N and is simply supported between the bearings 2.5 metres apart. Determine the size of the shaft, if the allowable shear stress is 42 MPa and the maximum tensile or compressive stress is not to exceed 56 MPa . What size...
- Design and draw a protective type of cast iron flange coupling for a steel shaft transmitting 15 kW at 200 rpm and having an allowable shear stress of 40 MPa . The working stress in the bolts should not exceed 30 MPa . Assume that the same material is used for shaft and key and that the crushing str...
- Design the longitudinal joint for a 1.25 m diameter steam boiler to carry a steam pressure of $2.5 \mathrm{~N} / \mathrm{mm}^{2}$. The ultimate strength of the boiler plate may be assumed as 420 MPa , crushing strength as 650 MPa and shear strength as 300 MPa . Take the joint efficiency as $80 \%$. ...
- A rectangular cross-section bar is welded to a support by means of fillet welds as shown in Fig.1. Determine the size of the welds, if the permissible shear stress in the weld is limited to 75 MPa . Fig. 1
- A locomotive semi-elliptical laminated spring has an overall length of 1 m and sustains a load of 70 kN at its centre. The spring has 3 full length leaves and 15 graduated leaves with a central band of 100 mm width. All the leaves are to be stressed to 400 MPa , when fully loaded. The ratio of the t...
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