274) Duplex feed pumps are used in small steam boilers. These operate on the principle of

Answer is:

reciprocating pump.

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275) The best suited coal for chain or travelling grate stoker boiler is

Answer is:

non coking or free burning coal

276) In natural circulation type boiler,

heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

water is supplied in durm and through down-comers located in atmospheric conditon it passes to the water wall and rises to drum in the form of mixture of water and steam

feed pump is employed to supplement natural circulation in water wall type furnace

water is converted into steam in one . pass without any recirculation

Answer is:

heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

277) Hard coke is produced by carborisation of coal at

Answer is:

95O-1100°C

278) Hard coke is used in

Answer is:

blast furnace

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