EMAR302: Basic Principles
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
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
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