20101. Which of the following is a poisonous fuel gas?
20102. In low temperature carbonisation (as compared to high temperature carbonisation) of coal
20103. Washing of coal does not reduce its
20104. Coke having higher porosity has
20105. A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having
20106. Combustion of pulverised fuel
20107. Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.
20108. Low temperature oxidation of coal during storage does not decrease its
20109. With increase in the oxygen content of the coal, its __________ decreases.
20110. The shift conversion reaction taking place during water gas manufacture is given by
20111. Which of the following is unsuitable fuel for producer gas manufacture ?
20112. A good metallurgical coke
20113. The main advantage of forced draft over natural draft is that
20114. Benzene is used
20115. The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal.
20116. Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C.
20117. A ‘Classification and Subject Index for Cataloguing and arranging the books and pamphlets of a library’was the title of the first edition of:
20118. The optimum percentage of excess air for combustion depends upon the __________ of the fuel.
20119. Fuel for a nuclear reactor (thermal) is
20120. "Micum Index" of a coke is a measure of its
20121. 'Wind loss' resulting from unscientific storage of coal may be the order of about __________ percent.
20122. Volatile matter content in coking coal may be about __________ percent.
20123. The main function of primary air in pulverised coal fired burner is to
20124. __________ is used as jet engine fuel.
20125. Fischer-Tropsch method aims at the
20126. To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in
20127. Artificial draught produced by a fan can be controlled by the
20128. Water gas constitutes mainly of
20129. Coke made in narrower by-product coke ovens (as compared to wider ovens) is
20130. Main constituent of the gas produced from a gobar gas plant is
20131. Steam is intermittently admitted into the fuel bed during the production of producer gas to
20132. In general, the limit of inflammability/explosion limit of fuel gases is widened by the
20133. Caking coal is desirable for
20134. Blast furnace gas compared to coke oven gas has
20135. Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature ?
20136. Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the
20137. Washing of coal is done to reduce the
20138. Volumetric ratio of N2 to O2 in dry atmospheric air is
20139. Coke oven gas burns with an yellowish flame, because of the presence of
20140. Calorific value of
20141. Which of the following would require least amount of secondary air for combustion ?
20142. 'Fat coals' are those coals which have very high
20143. Highly reactive coke have lower
20144. A coal with high ash content
20145. Coals used for the generation of producer gas should have
20146. A coal having higher volatile matter content will necessarily have lower
20147. An ordinal number which fixes the position of a document relative to the other documents having the same class is called:
20148. Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.
20149. With increases in carbonisation temperature