The phrase "ascertain what type" is correct and usable in written English.
You can use it when you want to determine or find out the specific category or classification of something.
Example: "Before proceeding with the project, we need to ascertain what type of materials will be required."
Alternatives: "determine what kind" or "identify what type".
"I am still trying to ascertain what type of documents they were," Mr. Sawyer said yesterday afternoon.
In fact, he says, he only writes because, to his chagrin, 'I never got an instrument under control.' Had he succeeded it is hard to ascertain what type of music the 44-year-old would have made.
Manufactured in Germany today, each DroneTracker includes cameras, acoustic and radio frequency sensors that can detect the presence of a drone and ascertain what type of drone it is.
It's crucial to ascertain what type of content works for your customer base.
Named the Apgar Score, this 0-10 metris is determined at one minute and five minutes after birth to ascertain what type of medical attention the newborn might require and today is used worldwide.
It will also be important to ascertain what types of online activities have benefits as well as the nature of these benefits (e.g., the impact of social support on NSSI behaviour).
As has been noted, [c]urrently, little information is available to ascertain what types of research are actually being undertaken in developing countries, how much work is being done, the benefits that studies presently offer communities, and whether research addresses the needs of developing countries, developed countries, or both [ 15].
This condition is again anecdotally recognised in horses but no research has been carried out to ascertain what level of exercise and type of training brings it about within the different equestrian disciplines and whether it is possible to predict individual predisposition in this respect.
By studying MLS Matchmaker data, we were able to ascertain what drives decisions and the types of things we're drawn to when given comparisons.
This limitation must be acknowledged in order to enable us to ascertain what determines an abusive situation within adolescent relationships and what types of situations are acceptable.
We will continue to speak to the victims to ascertain what this ascertained.
