Question

If magnitude of contact pressure between sealing lip and rotating shaft is very high then

(a) There is excessive friction

(b) High temperature

(c) Rapid wear

(d) All of the listed

This question stumped me by my college director while I was bunking the class.

Question is taken from the Unfired Pressure Vessels,Oil Seals & Wire Ropes unit in section Miscellaneous Machine Elements of Machine Design

Answer 1

The optimal answer is (d) All of the listed

The explanation is: With high pressure, friction increases leading to high temperatures and increasing wear.