two isothermals and two isentropics

two isentropics and two constant volumes

two isentropics, one constant volume and one constant pressure

two isentropics and two constant pres-sures

Carnot

Ericsson

Stirling

none of the above.

Dual combustion cycle

Diesel cycle

Atkinson cycle

Rankine cycle

increases

decreases

remains unaffected

first increases and then decreases

Rankine

Stirling

Carnot

Brayton