72) Benson boiler is a __________ water tube steam boiler using forced circulation of water.

73) Lancashire boiler has __________ internal flue tubes.

74) Locomotive boiler is a __________ boiler.

75) When steam after doing work in the cylinder passes into a condenser, the engine is said to be a

76) Water tube boilers produce steam at a __________ pressure than that of fire tube boilers.