Subtopic: I.C. engine systems – fuel, cooling, lubrication, ignition, electrical, intake and exhaust
Question Statement:
Which of the following functions are performed by the engine lubrication system in a farm tractor?
Options:
(A) Reducing frictional wear between sliding metallic surfaces
(B) Acting as a cooling medium to carry away heat from piston crowns and bearings
(C) Acting as a hydraulic sealing agent between piston rings and cylinder walls
(D) Increasing the octane rating of the fuel
Answer Key:
A, B, C
Step-by-Step Solution & Explanation
- A: Lubricating oil separates moving surfaces with an oil hydrodynamic film.
- B: Oil circulates through the oil cooler and sump, removing heat from pistons and bearings.
- C: Viscous oil seals minute microscopic clearances between rings and cylinder liners, preventing blow-by.
- D: Lubricating oil has no role in increasing fuel octane rating.