The removal of exhaust is called _________.
Answer: Scavenging
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Power Engineering Chapter 72
- Explain how the exhaust gases are discharged from the cylinder of a two stroke cycle spark ignition engine.
- The cylinder walls of a four-stroke cycle internal combustion piston engine are often lubricated with oil splashed up from the _________. The oil is kept out of the combustion chamber by the _________.
- In a four stroke cycle gasoline engine, each cylinder is fitted with two or more ___________ valves, held closely by _________.
- Ignition of the fuel in a diesel engine is achieved by means of:
- Diesel engines require:
- Diesel engine governing is accomplished by:
- In a compression ignition engine the fuel is ignited by:
- Larger, heavier industrial engines run most efficiently with lower cooling water temps. In the absence of a specified temp these might be taken to be:
- In a diesel engine high cylinder exhaust temperature could indicate:
- In reference to a 2 stroke compression engine: when exhaust is carried out through the exhaust valve in the cylinder head it is giving a _______ type of action.
- The most common methods of air induction are (pick 2):
- In order to get a more complete clearance of the cylinder, it is common in larger engine sizes to provide inlet air by _________, because the engine cannot draw in the necessary air by itself.
- One difficulty experienced in 2 stoke engines is completely clearing the exhaust gases after one cycle before the next.
- The ______ Stroke: As the piston rises again in the cylinder the remaining exhaust gases are forced out through the open exhaust valve. Just before the piston reaches TDC the inlet valve is opened and the whole cycle is repeated.
- The ______ Stroke: hot gasses of combustion expand and force the piston down. Before it reached BDC the burning gases have expended their energy and the exhaust valve is opened to allow them to escape the cylinder.
- During the compression stroke in a diesel engine compression of the air will have raised it's temperature to _______ and pressure in the range of _________.
- The ______ Stroke: After the piston has passed BDC the air inlet valve is closed and compression begins as the piston rises. Shortly before TDC fuel injection begins. Under the high temp & pressure conditions the fuel will ignite almost as soon as it enters the cylinders & combines with the hot air.
- The _______ Stroke: The inlet valve is opened just before the piston reached TDC & the exhaust valve closes just after the piston reaches TDC. This action draws a charge of air into the cylinder as the piston descends.
- Fuel is injected at high pressure directly into the engine cylinder, finely atomized & that ignition takes place without the aid of a spark. This description is referring to:
- There is a camshaft in a Two-Stroke Cycle Engine.
- Since the intake & exhaust functions are performed simultaneously during only a part of one stroke the Two-Stroke Cycle Engine gives a __________ every crankshaft revolution.
- This engine functions by utilizing 3 openings/ports in the cylinder wall which are covered & uncovered by the piston.
- The _______ engine gives good fuel economy, good control at all speeds & high torque at low speeds.
- The ________ cycle engine is lubricated by thoroughly mixing a measured qty of special lube oil with the gasoline in the tank.