32031-STRENGTH OF MATERIALS (SOM) Questions paper 2018

32031-STRENGTH OF MATERIALS

Date :                                                                                                                  session: AN
Time :                                                                                                                  Max Mark : 50

PART A (4*2=8)

(Answer all the Questions)

1. Define Centre of gravity.
2. Define Radius of gyration.
3. Define THIN Cylinders.
4. List Out types of springs.

PART B (4*3=12)

                                                           (Answer all the Questions)

1. Stare arallel Axis theorem.
2. Define hoop stress & longitudinal stress.
3. A boiler 2.8m diameter is subjected to a steam pressur of 0.68N/mm^2. Find the hoop stress and longitudinal stress.if the thickness of the boiler plate id 10mm.
4. Difterence between open and closely springs.

PART C (3*10=30)

(Answer all the Questions)

1. An I-section has the top flane 120mm x 20mm thick. web 180mm x 20mm thick and the bottom flange 200mm x 40mm thick. Calculate the values of Ixx Iyy Kxx and Kyy for this section.
2. Acylindrical shell 3m long has 1m in diameter and 10mm thickness.Calculate the circumferemial and longitudinal stresses induced. Also calculate char, ges in diamether,lenth and volume of the shell if it is subjected to an internal pressure of 1.5N/mm^2 . Take E=2x10^5 N/mm^2 and Poisson's ratio =0.3
3. A truck weighing 30KN and moving at 5Km/hr has to be brought to rest by buffer. Find how many springs, each of 18 coils will be required to the energy of motion during a com;ression of 200mm. The spring is made out of 25mm diameter steel rod coiled to a mean diameter of 240mm.Take N=0.84x10^5 N/mm^2.

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