The phrase "are generally set by" is correct and usable in written English.
It can be used when discussing rules, standards, or guidelines that are typically established by a specific authority or group.
Example: "The regulations for the competition are generally set by the organizing committee to ensure fairness and consistency."
Alternatives: "are typically established by" or "are usually determined by".
International air fares for any two destinations are generally set by consensus between their governments.
China does not allow formal labor unions (apart from the government's own union), and labor laws are generally set by prefecture rather than at the federal level.
Milk prices are generally set by the Federal Government, under a Depression-era system intended to insure even distribution and fair pricing of the perishable product.
And while whoever is in the White House sets the overall tone and philosophy, antitrust policies are generally set by the top officials appointed to the Federal Trade Commission and the Justice Department.
For example, although vacation days and the number of scientific meetings you get to attend per year are generally set by institutional policy (because they affect everyone), your supervisor may have some flexibility on those, because he or she manages their implementation.
The price of milk is generally set by the Federal Government under a Depression-era system established to insure even distribution and fair pricing for this perishable product.
This is generally set by the ability of the eye to discern detail, as well as by the basic physics of image formation.
His stories are generally set in Abkhazia and are linked by recurring characters and incidents; often based on his experiences in Abkhazia during the 1930s and '40s, they are also partly autobiographical.
While OPEC sets oil prices largely by supply and demand, natural gas prices are generally set relative to crude prices.
The threshold line is generally set automatically by the qPCR analysis software to a value several standard deviations above the background fluorescence, to a point at which the PCR reaction is in the log linear phase of amplification.
His ruddy face was generally set in seriousness, an appearance accentuated by his eyeglasses.
