thermal resistance

Observations indicate that in system involving flow of fluid , heat & electercity, the flow quantity is directly proportional to the driving potential & inversaly proportional to the flow resistance. In a hydroullic circuit , the preassure along the path is the driving potential & the voltage potential & electric resistance of the materia. Likewise, temprature diffrence constitutes the driving force for heat conduction through a medium. From ohm's law:- Current(i)= voltage potentia(dV)/electrical resistance(Re) & from fourier's law:- Heat flow rate =temprature potential/thermal resistance Q=dt/(dx/kA) Note:- »Electric current is analogous to thermal heat flow rate (kj/hr.) »volts corresponds to thermal temprature diffrence(°k) »electric resistance(ohms) is analogus to quantity dx/kA this quantity calledTHERMAL RESISTANCE.

stability & hounting related to governer

stability: a governor is said to be stable if there is only one radious of rotation for all equilibrium speeds of the walls withwithinthe working range. hunting:when speed of the governor fluctuates above & below the mean speed is called hunting.

engine runs but backfires

Backfires is a pop or bang in the exhaust manifold it can be coused by the several conditions in ignition system. If the ignition timming is considerably offer if position cross fire occurs ignition may occur result before intake valve closed.

troubleshooting of ignition system

Engine works but fails to start-due to failure in fuel system engine backfire but fails to start:- due to ignition lag & valve timming. Engine runs but misses.:- couse could be defective spark or high voltage cable. Engine runs but backfires:- backfires is a pop or bang in the exhaust manifold. It can be coused by several conditions in ignition system. If the ignition timing is considerably pffer if position crossfire occurs ignition may occur result before intake valve closed