4th Class Power Engineering Unit A12: Elements of Boiler Systems Questions and Answers 100% Pass

4th Class Power Engineering Unit A12: Elements of Boiler Systems Questions and Answers 100% Pass In falling shot cleaning, iron shot or pellets, _________ mm in diameter fall by gravity: Select one: a. 6 b. 9 c. 3 d. 12 a With this system, not electrical power is required to feed make-up water to the boiler: Select one: a. gravity return system b. pump return system c. low flow return system d. high side return system a Combustion air provide din addition to primary and secondary air used to completer the combustion processes in some burner designs is called: Select one: a. tertiary air b. theoretical air c. terreria air d. third air a The channel through which fuel is fed in an underfeed stoker arrangement is called a: Select one: a. retort b. repose c. ram block d. tuyeres a The amount of air delivered for combustion above the theoretical air is called: Select one: a. free air b. tertiary air c. secondary air d. excess air d This type of measurement is often used to determine the dissolved solids concentration in boiler water: Select one: a. iron test b. pH test c. conductivity test d. silica test c Oil leaves the end of the rotating cup on a rotary cup oil burner at or near a _________, as it enters the air stream: Select one: a. 45o angle b. 25o angle