a. A full journal bearing of 50 mm diameter and 100 mm long has a bearing pressure of 1.4
N/mm2. The speed of the journal is 900 r.p.m. and the ratio of journal diameter to the
diametral clearance is 1000. The bearing is lubricated with oil whose absolute viscosity at
the operating temperature of 75°C may be taken as 0.011 kg/m-s. The room temperature is
35°C. (7 marks) Find:
1. The amount of artificial cooling required, and
2. The mass of the lubricating oil required, if the difference between the
outlet and inlet temperature of the oil is IO °C. Take specific heat of the
oil as 1850 J/kg/ °C.

b. What are hydrostatic thrust bearings? How are they classified? )5 marks)

a. Discuss the failure modes of rolling element bearings. (3 marks) b. Design a self-aligning
ball bearing for a radial load of 7000 N and a thrust load of 2100 N. The desired life of the
bearing is 160 millions of revolutions (6 marks) at 300 r.p.m. Assume uniform and steady
load.

c. Differentiate between pivoted and fixed shoe bearings. (3 marks)