139) A __________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.

140) Willian's law holds good for throttle-governed engine, but not for cut-off governed engine.

141) Which of the following is required for a steam condensing plant ?

142) The missing quantity is mainly due to cylinder condensation and a small amount of steam leakage past the valves and piston.

143) There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called