AUGUST 2017 Sub. Code :2404
B.Sc. PROSTHETICS AND ORTHOTICS
FIRST YEAR
PAPER IV APPLIED MECHANICS AND STRENGTH OF MATERIALS
Q.P. Code: 802404
Time: Three Hours Maximum 100 Marks
Answer All questions
I. Elaborate on: x 10 30)
1. A mild steel rod of 20mm diameter and 300mm long is enclose centrally inside
a hollow copper tube of external diameter 30 mm and internal diameter 25 mm.
The ends of the rod and tube are brazed together and the composite bar is
subjected to an axial pull of 40 kN. If E for the steel and copper is 200 Gpa and
100 Gpa respectively find the stresses developed in the rod and tube. Also find
extension of steel rod.
2. Explain about torsion. Derive an expression for torsional stress and strain.
3. A cantilever beam AB 1.8 meter long carries a point load 2.5 kN at its free end
and uniformly distributed load of 1kN/m from A to B. Draw the sheer force
and bending moment diagram for the beam.
II. Write notes on: x 5 40)
1. Equilibrium and its equation.
2. Two like parallel forces 50N and 100N act at the ends of a rod 360mm.
Find the resultant force and the point at which it act.
3. Find the CG of T section 100mmx 150mmx30mm T section.
4. Define force and its effects. Find the force which can give a body of mass
100 kg accelerated at 3.5 m/sec ².
5. Polar moment of inertia.
6. Water pollution and its causes and preventive measures.
7. Control system in prosthetics with example.
8. Elastic limit and hooks law.
III. Short answers on: (10 x 3 30)
1. What do you understand by ultimate stress?
2. Find the unit vector of 3i+4j.
3. State Newton's second law.
4. What is volumetric Strain?
5. Explain about deflection of beam.
6. Write briefly on close loop and open loop in control system.
7. Tensile and compressive stress.
8. Angular velocity.
9. Conservation of Energy.
10. Man machine interaction.