Internal Combustion Engines
Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads

The friction is unpredictable
The friction is high
The small difference in cooling water temperature or in internal friction has a disproportionate effect
The engine is rarely operated

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Internal Combustion Engines
Which one of the following engines will have heavier flywheel than the remaining ones?

30 kW two-stroke diesel engine running at 750 r.p.m.
30 kW four-stroke diesel engine running at 750 r.p.m.
30 kW two-stroke petrol engine running at 1500 r.p.m.
30 kW four-stroke petrol engine running at 1500 r.p.m.

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