The boiler efficiency is given by (where m = Total mass of water evaporated into steam in kg/h, m_f = Mass of fuel in kg/h, C = Calorific valve of fuel in kJ/kg of fuel, h = Total heat of steam in kJ/kg, and h_f1 = Sensible heat of feed water in kJ /kg)

Clearance ratio is the ratio of

A device used to empty the boiler whenever required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler, is called blow off cock.

In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of

The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called