Which condenser type is not used in steam power plants?

• A. Barometric condenser
• B. Contact condenser
• C. Surface condenser
• D. Vacuum condenser

Answer: (D)

In steam power plants, condensers are designed to turn exhaust steam back into water while keeping back pressure as low as possible. The common configurations are surface condensers (shell-and-tube where cooling water flows inside the tubes and the steam condenses on the outside), direct-contact condensers (cooling water directly mixes with the exhaust steam to condense it), and barometric condensers (a type of surface condenser that uses a barometric leg to create a low pressure and separate condensate). A dedicated “vacuum condenser” isn’t used as a separate condenser type because the vacuum condition is simply the operating pressure inside the condenser, achieved by the plant’s vacuum system, not a distinct condenser design. So a vacuum condenser isn’t a separate, used type in steam power plants.