Is Maschinenraum der, die or das?

The correct German article for Maschinenraum is der. The noun Maschinenraum is Masculine. So you always say: der Maschinenraum. Learn the article together with the noun — German nouns don't follow predictable gender rules most of the time.

The plural of Maschinenraum is: die Maschinenräume. In the plural, every German noun takes the article "die". So: die Maschinenräume. Example: ein Maschinenraum → zwei Maschinenräume.

Correct: die Maschinenräume. The form "die Maschinenraums" is wrong. The plural of der Maschinenraum is die Maschinenräume. In the nominative plural, you always use the article "die".

der Maschinenraum follows the four German cases. Nominative: der Maschinenraum, Accusative: den Maschinenraum, Dative: dem Maschinenraum, Genitive: des Maschinenraums. In plural: die Maschinenräume / den Maschinenräumen. Learn these forms together with the noun.

The genitive singular of der Maschinenraum is: des Maschinenraums. The genitive plural is der Maschinenräume. German uses the genitive to express possession or belonging. Example: die Farbe des Maschinenraums.

The dative plural of Maschinenraum is: den Maschinenräumen. In German, dative plural nouns usually end in "-n". So you say: "mit den Maschinenräumen". Use this case after prepositions like mit, von, bei, zu.

Maschinenraum is a noun and must be capitalized in German. You'll find example sentences above for each case. The article der stays the same in nominative singular but changes in other cases. Practice declension in your own sentences.

Yes, Maschinenraum is a noun (also called a substantive). German nouns are always capitalized. The article for Maschinenraum is der. Every German noun has a fixed article you must memorize.