Some companies/industries have standard supplier questionnaires because they require suppliers to become approved and be added to a formal company list. In my experience they ask a lot of basic questions but by going through the process the answer becomes clear.
Some questions I've seen:
Quality Systems to which the company is registered?
Individual responsible for the Quality Assurance function?
Total number of company personnel:
Total number of production personnel:
Total number of QA inspection personnel?
Do you have a procedure for the control of new and existing customer drawings, specifications, and/or other PO requirements?
Are there procedures in place for purchasing and handling of customer orders?
Do you have a procedure for stock control including items with shelf life requirements?
Do you have a procedure for environment controls?
Do you have a procedure for Statistical Process Control?
Do you have procedures for measuring equipment and is all equipment is calibrated to traceable standards?
Do you have procedures and records for preventive and corrective maintenance of equipment?
Do you have procedures for packaging, marking, labeling and shipping, including shipping requirements, final inspection?
Do you have a procedure to notify customers of changes to product prior to shipment?
Do you have a procedure for customer complaints and feedback with records of effective resolution?
Mechanical design engineer