20151. Purity of coke means that, it is high in carbon and low in
20152. Largest constituent of blast furnace gas is
20153. Out of the following, which is the most important parameter for the blast furnace grade coke ?
20154. Presence of nitrogen in combustion air does not reduce the
20155. The gasification reaction represented by, C + H2O = CO + H2, is
20156. Insitu theory and drift theory are related to the
20157. Biochemistry is an example of the mode of formation of subjects:
20158. Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr.
20159. Which of the following will generate maximum volume of product of complete combustion (Nm3/Nm3 of fuel) ?
20160. Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?
20161. Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of
20162. Pick out the wrong statement.:
20163. A good metallurgical coke should have very low
20164. Cannel coal
20165. Presence of force moisture in coal is most disadvantageous during its
20166. Tar is a better fuel than furnace oil, because of its
20167. With increase in moisture content of coal, its
20168. Main constituent of natural gas is
20169. For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will
20170. Ignition temperature decreases progressively from anthracite to lignite, because
20171. Which of the following fuel gases is heavier than air ?
20172. Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.
20173. Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt 'using theoretical amount of air in
20174. Use of preheated air for combustion of fuel in the furnace, increases the
20175. Which of the following has the highest flame velocity ?
20176. Which of the following constituents of a fuel does not contribute to its calorific value on combustion ?
20177. Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces
20178. For long flame and easy ignition, the coal used should have
20179. Which of the following has the highest calorific value (kcal/Nm3) ?
20180. In flue gas analysis by Orsat's apparatus, oxygen is absorbed by
20181. Natural draft created by the chimney depends upon
20182. Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the
20183. Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.
20184. The most matured coal out of the following is
20185. In UDC,equal to(=)sign is used to add:
20186. Which of the following has the highest gross calorific value ?
20187. A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the
20188. Efficient burning of anthracite coal requires
20189. C/H ratio is the minimum in case of
20190. Naphthalene is used for making
20191. The advantage of firing pulverised coal in the furnace lies in the fact, that it
20192. A coal having higher volatile matter content, has lower
20193. Weathering of coal during storage causes
20194. With increase in the temperature of carbonisation of coal
20195. The calorific value of natural gas is about __________ kcal/Nm3.
20196. Thrishna is a CDS/ISIS based software developed by:
20197. Critical Air Blast (CAB) value of coke is a direct measure of its
20198. The function of secondary combustion air is to
20199. The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always