Topic 6

Diesel engine combustion is the process of combusting _______________ to create an expanding gas that makes the engine operate.

Turbochargers are centrifugal compressors driven by the exhaust gas turbines.

Superchargers are:

(1) Compressors

(2) Driven mechanically by engine crankshaft

(3) Used for increasing the air pressure above atmospheric pressure

Which of the above are true?

Inadequate scavenging leads to low amount of oxygen availability which results in incomplete combustion leading to higher specific fuel combustion.

What is used in engines to reduce the noise at the exhaust?

The process of clearing the cylinder after the expansion stroke is called scavenging process.

If the temperature of charge intake air increases, then the engine's efficiency will:

Combustion process plays an important role in controlling and reducing the NOx emission.

The power developed by the turbocharger is not sufficient to drive the air compressor, and overcome its mechanical friction.

In a four stroke engine, the combustion process takes place every:

A piston compression ring seals best when pressure is max, i.e. during

Which ring will cause excessive oil consumption if it is installed upside down?

Valve overlap occurs during

To achieve effective combustion in a Diesel engine, three independent factors must take place. There must be an adequate supply of:

In a Diesel engine, the injected fuel is:

In a Diesel engine, the duration between the time of injection and ignition is:

. Ignition lag is:

Scavenging air in a Diesel engine mean:

A centrally located fuel injector in a diesel marine engine is most likely to have how many valves per cylinder? � � Two; � � Three; � � Four; � � Any number of valves