186) A condenser where circulating water flows through tubes which are surrounded by steam, in known as

187) Combustuion of fuel takes place __________ the engine cylinder of a steam engine.

188) The forced circulation of water does not take place in

189) A device used to heat feed water by utilising the heat in me exhaust flue gases before leaving through the chimny, is known as

190) The factor of evaporation for all boilers is always