Technician a says that the back of all engine bearings should be lubricated during assembly. technician b says that the face of the main and rod bearings should be lubricated before final assembly. which technician is correct?

Technician B is correct.

Explanation:

Friction is an oppositional force that tends to oppose the relative motion of two surfaces in contact. The two types are; static and dynamic friction. Because it generates heat and reduces the efficiency of a machine, it has to be reduced in machines.

Friction can be reduced either by; lubrication, polishing or smoothing, streamlining and the use of bearings. A bearing is a device that can be used to reduce friction between two moving parts. There is a need for the lubrication of the bearing during assembling to ensure its smooth running. Lubrication is a process of reducing friction between moving parts by the use of oil or grease.

The face of the main and rod bearings should be lubricated before final assembly because after the assembly, the rod is found to rotate within the main bearing. Thus, friction between these moving parts has to be reduced.

Engine bearings are used to reduce friction between the rotating part of the engine and the stationary part. Lubrication is important to avoid unnecessary noise, the disruption of the bearings and complete damage of the engine. Its internal part has to be lubricated and not the back, to increase the gripping at the back due to friction.

In both cases, lubrication is very important.      

this isn't the answer but they're the graphs

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.