175) The draught may be produced by a

176) The rate of flow of steam is __________ in case of fire tube boilers.

177) The number of water level indicators in a boiler are generally __________ in number.

178) The fire tubes in a Locomotive boiler has __________ diameter.

179) A throttle governed steam engine develops 15 kW with 280 kg per hour of steam and 35 kW with 520 kg per hour of steam. The steam consumption in kg per hour when developing 20 kW will be nearly