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Diesel engine
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===Stationary diesel engines=== [[File:The National Archives UK - CO 1069-182-9.jpg|thumb|Three English Electric 7SRL diesel-alternator sets being installed at the Saateni Power Station; [[Zanzibar]], 1955]] Stationary diesel engines are commonly used for electricity generation, but also for powering refrigerator compressors, or other types of compressors or pumps. Usually, these engines either run continuously with partial load, or intermittently with full load. Stationary diesel engines powering electric generators that put out an alternating current, usually operate with alternating load, but fixed rotational frequency. This is due to the mains' fixed frequency of either 50 Hz (Europe), or 60 Hz (United States). The engine's [[crankshaft]] rotational frequency is chosen so that the mains' frequency is a multiple of it. For practical reasons, this results in [[crankshaft]] rotational frequencies of either 25 Hz (1500 per minute) or 30 Hz (1800 per minute).<ref name="Tschöke_2018_1066" />
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