EMAR302: Basic Principles

A highly detailed and technical illustration of various engine components, including indicator diagrams, fuel injectors, and exhaust systems in a dynamic marine environment.

EMAR302: Basic Principles Quiz

Test your knowledge on the fundamental principles of marine engineering with this engaging quiz tailored for students and professionals alike. Challenge yourself with 10 multiple-choice questions that cover vital topics in engine performance, efficiency, and operation.

Assess your understanding of indicator diagrams
Explore the impact of fuel properties on engine performance
Gain insights into two-stroke vs. four-stroke engines

10 Questions2 MinutesCreated by EngagingEngineer481

Which of the indicator diagrams is used to check the timing of the opening and closing of the exhaust valve

The power card diagram

The compression diagram

The light spring diagram

The draw card diagram

A higher than usual PMax pressure on the indicator diagrams can represent:

Early ignition of the fuel

Late ignition of the fuel

The amount of air supplied is too much

The engine is starting to lose compression

If the cetane rating of the fuel is incorrect for the engine

The engine may suffer from afterburning

The engine may suffer from early firing

The fuel may not ignite at all

All the answers are correct

The crank angles of a two stroke engine are:

2 cylinder engine / 90 degrees

4 cylinder engine / 60 degrees

6 cylinder engine / 90 degrees

4 cylinder engine / 90 degrees

For a two stroke engine with exhaust ports:

The scavenge ports close before the exhaust ports

The exhaust ports close before the scavenge ports

The scavenge and exhaust ports close at the same time before BDC

The scavenge and exhaust ports close at the same time after BDC

A compression diagram is taken:

With the engine off and turning over with the use of the turning gear

With the fuel off to the particular unit in question

When the engine is new to ascertain the power developed

To see the timing of the fuel injection process

Why is scavenge air pressure more important in a two stroke engine in comparison to a four stroke engine?

There is no 'non-working' stroke in a two stroke engine

Two stroke engine turbochargers run slower when compared to four stoke engine turbochargers

There are double the number of cylinders on a four stroke engine

This is not true, the scavenge air pressure is equally important for both engine types.

With regards to an engines' heat balance, which of the following is not regarded as a efficiency saving?

Turbochargers

Fresh water generators

Turbogenerators

Superchargers

Why are power cards not usually taken on a medium speed engine?

We are only interested in the power developed from a two stroke engine

The engine is running too fast, the results are innacurate

We only test power outputs from two stroke main propulsion engines

Not true, we do take power cards on all four stroke engines

How would the use of 'cold' heavy fuel oil show up on an indicator card?

Through higher than usual pressures as seen from the diagrams

The draw card would show after-burning is taking place

The PMax value would be higher than usual

The temperature of the fuel has no impact to the burning of the fuel

EMAR302: Basic Principles

EMAR302: Basic Principles Quiz

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