No, but it can be either a verb or an adjective(e.g. lowered gaze, lowered levels).
It is the past tense and past participle of the verb to lower.
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No, the word 'lowered' is the past participle, past tense of the verb 'to lower' (lowers, lowering, lowered); for example: They lowered the bridge after the ship had passed.
The past participle of the verb is also an adjective; for example lowered prices; lowered expectations.
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lowered
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If it is a raido it can be lowered However sounds like a
consturction site cannot be lowered There are many things that can
be lowered or not lowered