7.

8.

PART C

a. Explain the terms eccentricity, attitude and attitude angle with the help of neat
sketches. (3 marks)

b. Derive the load carrying capacity of a hydrostatic thrust bearing. (7 marks)

c. The role of restrictors in hydrostatic bearings. (2 marks)

a. Derive the relation between the life, load and strength for a rolling element
bearing. (3 marks) b. A 45 BC 03 single row deep groove ball bearing which
is to operate at 2000rpm is acted by a 10KN radial load and an 810! thrust load.
The bearing is subjected to a light shock and the outer ring is rotating.
Determine the rating life of the bearing. (6 marks) c. What are the different
failure modes of rolling element bearings. (3 marks)

a. Explain the terms Reynold's boundary condition, full Sommerfeld boundary
condition and half Sommerfeld boundary condition. (3 marks) b. In a journal
bearing, diameter of the shaft is 75mm, |/= |, radial clearance is 0.05 mnt,
ho—O.02mm, speed of journal=400rpm, radial load=3.5kN, specific gravity of
oil=0.9 and specific heat of oil=l.75kJ/kg/ °C. Calculate the viscosity of a suitable
oil, power lost in friction and the resultant temperature rise. (7 marks) c.
Advantages of pivoted shoe bearing. (2 marks)