Acetone (BP 329K) and CS₂ (BP 320K) are mixed in a definite composition so that the mixture of the two behave like pure liquid and boils at 312K, then it is

BP of pure acetone = 329K

BP of pure CS₂ = 320K

BP of Acetone - CS₂ azeotrope =312K

BP of the azeotrope is lesser than the BP of any of the components.

Such an azeotrope is Minimum boiling azeotrope

lesser BP indicates higher VP than expected

Such an azeotrope shows positive deviation