Tüylenme sınıflandırma sırasında kontrol edildi.

Tüylenme is a noun. It comes from tüylenmek, meaning to become hairy / fuzzy / covered in fibers, depending on context.

A useful breakdown is:

• tüy = hair, feather, fiber
• -len- = a verb-forming element that can give the sense to acquire / become covered with
• -me = a verbal noun / action noun ending

So tüylenme means something like:

• fuzzing
• hairiness
• fiber formation
• the process/result of becoming fuzzy

In technical contexts, it often refers to a surface defect or material property rather than literal body hair.

Because sırasında means during or in the course of.

Here is the structure:

• sınıflandırma = classification
• sırasında = during it / during the time of it

So together:

• sınıflandırma sırasında = during classification

This is a very common Turkish pattern:

• ders sırasında = during the lesson
• toplantı sırasında = during the meeting
• test sırasında = during the test

It functions a lot like English during + noun.

Sırasında is built from sıra plus endings, and in modern Turkish it works like a postposition-like time expression meaning during.

You can think of it roughly as:

• sıra = order, sequence, turn
• -sı = third-person possessive
• -nda = locative ending (in/on/at)

So literally it originally has the sense of in its course/order, but learners usually just need to remember:

• X sırasında = during X

Even though the internal structure is more complex, in practice you learn it as a fixed expression.

Because kontrol edildi is passive, while kontrol etti is active.

• kontrol etti = he/she/it checked
• kontrol edildi = it was checked

In your sentence, the focus is on tüylenme as the thing being checked, not on who did the checking. Turkish often uses the passive when the agent is unknown, unimportant, or obvious from context.

So:

• Tüylenme kontrol edildi. = The fuzzing/hairiness was checked.
• Bir görevli tüylenmeyi kontrol etti. = An official checked the fuzzing/hairiness.

It is made from the noun/verb-like item kontrol et- plus passive and past marking.

Breakdown:

• kontrol etmek = to check, to inspect
• edil- = passive form of et-
• -di = definite past tense

So:

• kontrol edildi = was checked

This is very common with many borrowed nouns used with etmek:

• analiz etmek → analiz edildi = was analyzed
• test etmek → test edildi = was tested
• kabul etmek → kabul edildi = was accepted

Because in this sentence tüylenme is the grammatical subject of a passive verb, not a direct object.

Compare:

• Görevli tüylenmeyi kontrol etti.
  = The official checked the fuzzing.
  Here tüylenmeyi is the direct object, so it takes accusative -yi.

• Tüylenme kontrol edildi.
  = The fuzzing was checked.
  Here tüylenme becomes the subject of the passive sentence, so there is no accusative ending.

This is one of the most useful things to notice in Turkish passives.

Yes. In this passive sentence, tüylenme is the subject.

The sentence structure is basically:

• Tüylenme = subject
• sınıflandırma sırasında = time expression
• kontrol edildi = predicate / verb phrase

Even though English learners may think of the thing checked as an object, in a passive sentence it becomes the subject:

• The hairiness was checked
• Tüylenme kontrol edildi

Because Turkish normally puts the main verb at the end, and information like time, place, and manner often comes before it.

So this order is very natural:

• Tüylenme sınıflandırma sırasında kontrol edildi.

A rough pattern is:

• subject + time/place/etc. + verb

Other possible orders can exist for emphasis, but the verb usually stays at the end.

For example:

• Numune laboratuvarda incelendi. = The sample was examined in the laboratory.
• Kusur üretim sırasında fark edildi. = The defect was noticed during production.

Yes, absolutely. That would also be natural.

Both of these are possible:

• Tüylenme sınıflandırma sırasında kontrol edildi.
• Sınıflandırma sırasında tüylenme kontrol edildi.

The difference is mainly one of emphasis or information flow.

• Starting with Tüylenme highlights the thing being checked.
• Starting with Sınıflandırma sırasında highlights the time/context first.

Turkish word order is flexible, but the verb still normally comes last.

It is a compound verb expression built from kontrol etmek.

In Turkish, many borrowed nouns combine with etmek to function like verbs. So:

• kontrol = control/check
• etmek = to do, to make

Together:

• kontrol etmek = to check

Then Turkish applies tense, voice, and other endings to the etmek part:

• kontrol ediyor = is checking
• kontrol etti = checked
• kontrol edildi = was checked
• kontrol edilecek = will be checked

So it behaves like a normal verb phrase.

Yes. Esnasında is often similar to sırasında, and both can mean during.

So you could say:

• Tüylenme sınıflandırma sırasında kontrol edildi.
• Tüylenme sınıflandırma esnasında kontrol edildi.

In many contexts, both are fine. Sırasında is very common and neutral. Esnasında can sound a bit more formal in some situations, though this depends on style and speaker preference.

Because Turkish does not have articles like English the and a/an.

So a noun like tüylenme can mean:

• hairiness
• the hairiness
• a case of hairiness

The exact interpretation comes from context.

In technical writing, bare nouns are very common, especially when talking about:

• defects
• processes
• categories
• measurements
• materials

So Tüylenme ... kontrol edildi is perfectly normal Turkish.

Yes, it sounds fairly formal and technical.

Reasons:

• tüylenme is a specialized or semi-specialized noun in many contexts
• sınıflandırma is formal vocabulary for classification
• kontrol edildi is a standard passive form often used in reports, procedures, and technical descriptions

This kind of sentence would fit well in:

• quality-control documentation
• laboratory reports
• textile/material inspection
• industrial procedures

It is less like casual everyday conversation and more like written procedural Turkish.