B.TECH - Semester 6 design of machine elements i Question Paper 2020 (jan)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- 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?
- 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.
- 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 7...
- 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 sh...
- 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 comp...
- 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 i...
- 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 a...
- 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
- 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 \mathr...
- 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 ...