Not sure if you have in mind entrance exams or something that's not set by professors (he mentions mid-terms). Or perhaps you have your local example in mind.
This however is absolutely the case in my country, exam questions are set by the teachers, and are graded by them (well, often also by postgraduates given this task by the teacher so they can slack).
As for the US, I did a quick search now, and found this: "Unlike final exams, which are scheduled by the university’s Registrar, midterm exams are typically scheduled during class time by the professor. Some classes may have two midterm exams, in which case they are spread further throughout the semester. Professors outline these exams in the course syllabus, so they will not come as a surprise. The weight of each midterm exam on the final grade is also usually provided in the course syllabus. Many instructors are open to telling students about the format of the midterm exam, as well as the topics or themes that the exam will cover."
So looks like it's on the instructors, as the grandparent says there too.
This however is absolutely the case in my country, exam questions are set by the teachers, and are graded by them (well, often also by postgraduates given this task by the teacher so they can slack).
As for the US, I did a quick search now, and found this: "Unlike final exams, which are scheduled by the university’s Registrar, midterm exams are typically scheduled during class time by the professor. Some classes may have two midterm exams, in which case they are spread further throughout the semester. Professors outline these exams in the course syllabus, so they will not come as a surprise. The weight of each midterm exam on the final grade is also usually provided in the course syllabus. Many instructors are open to telling students about the format of the midterm exam, as well as the topics or themes that the exam will cover."
So looks like it's on the instructors, as the grandparent says there too.