The phrase "a collection of questionnaires" is correct and usable in written English.
It can be used when referring to a group or set of questionnaires that are gathered for a specific purpose, such as research or data collection.
Example: "The researchers distributed a collection of questionnaires to gather data on consumer preferences."
Alternatives: "a set of questionnaires" or "a group of questionnaires".
The module 'Chemotherapy Convenience and Satisfaction Questionnaire' (CCSQ) of the Functional Assessment of Chronic Illness Therapy (FACIT) Measurement System, a collection of HRQoL questionnaires related to the management of chronic illnesses, measures the health-care satisfaction of patients (Webster et al, 2003; Yost et al, 2005a).
While working with the Missionary Research Library Archives at Burke Library I processed MRL12: Personnel Policies of Foreign Mission Boards Records, a collection of 500 completed questionnaires that had been distributed in 1950 to former missionaries.
The research is based on a collection of literature from research questionnaires and surveys and was initially conducted by sending 130 survey questionnaires to certain nominated consultant firms in Esfahan.
This collection of questionnaires provides a glimpse into what people were thinking almost immediately following the protest, and how viewpoints of faculty and students may have crossed or differed substantially.
Concurrent with the collection of questionnaires from patients, a second study was conducted of practice activity for back pain patients as recorded in practice computer databases.
Participants will undergo ADHD 'assessment as usual', which varies between clinics, clinicians and cases, but will typically involve an interview with the parent/young person and collection of questionnaires from the parent/young person and teacher.
Indeed, the collection of questionnaires prepared by the Geological Survey of India and sent through the government of Bihar and Orissa were a major source of information in terms of macroseismic effects (e.g., Dunn et al. 1939).
