Internal Combustion Engines
In a four stroke cycle engine, the sequence of operations is

Suction, compression, expansion and exhaust
Suction, expansion, compression and exhaust
Expansion, compression, suction and exhaust
Compression, expansion, suction and exhaust

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

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