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The phrase 'questionnaires were collected' is correct and usable in written English.
You can use it when referring to the process of collecting information from a group of people using a questionnaire. For example: "After distributing the survey, questionnaires were collected from a total of 500 respondents."
Exact(60)
One hundred and seventeen questionnaires were collected from schoolteachers.
Completed questionnaires were collected and data were analyzed.
Seven hundred fifty-four valid questionnaires were collected for analysis.
479 printed questionnaires were collected from Marmara Region.
Some environmental parameters were measured together with subjective investigation, and totally 1747 valid questionnaires were collected.
At total 692 questionnaires were collected and analyzed during rainy and dry seasons.
In total, 288 fully completed questionnaires were collected and used in the analysis.
181 qualified questionnaires were collected.
A total of 202 questionnaires were collected.
The questionnaires were collected at the end of the term.
Completed questionnaires were collected a few days later.
More suggestions(16)
answers were collected
interviews were collected
questionnaires were selected
questionnaires were constructed
queries were collected
surveys were collected
questionnaires were detected
papers were collected
sheets were collected
questionnaires were located
questionnaires were completed
issues were collected
matters were collected
cards were collected
questionnaires were collated
questionnaires were gathered
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com