Question

In forced feed system of lubrication, the oil pressure should be almost ___________

(a) 30 kg/cm^2

(b) 20 kg/cm^2

(c) 10 kg/cm^2

(d) 3 kg/cm^2

This question was addressed to me during an online interview.

The question is from Principles of Forced Feed System topic in section Lubrication System and Tractor’s Classification of Farm Machinery

Answer 1

The correct choice is (d) 3 kg/cm^2

Explanation: Oil pressure is an important factor in the durability of most internal combustion engines and with a forced lubrication system, oil is picked up by a positive displacement oil pump and is then forced into the oil galleries into bearings, such as the main bearings, big end bearings and camshaft bearings or balance shaft bearings.