Thrust bearings:
1. are used on reaction turbines
2. prevent the turbine rotor moving axially
3. are always installed on both ends of the rotor shaft
4. are lubricated with the same oil as the main bearings
a) 1, 2, 4
b) 2, 3, 4
c) 1, 2, 3
d) 1, 3, 4
e) 1, 2, 3, 4
Answer: A