Internal Combustion Engines
The voltage required to produce a spark across the gap, between the sparking points is

10,000 to 12,000 volts
4000 to 6000 volts
6000 to 10,000 volts
2000 to 4000 volts

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

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