18101. For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of
18102. Space time in flow reactor is
18103. For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the
18104. Cold shot cooling is only practical when the feed temperature is __________ than the reaction temperature.
18105. Rajendra Chola’s greatest achieveement was in the field of?
18106. The preferred reacting system for oxidation of o-xylene to phthalic anhydride is
18107. The effectiveness factor for large value of Thiele modulus (LK/D1 ) of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second)
18108. A first order reaction A B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by
18109. Following isothermal kinetic data are obtained in a basket type of mixed flow reactor for a porous catalyst. Determine the role of pore diffusion and external mass transfer processes.
18110. Which of the following will give maximum gas conversion ?
18111. __________ explains the mechanism of catalysis.
18112. From among the following, choose one which is not an exothermic process.
18113. The fractional volume change of the system for the isothermal gas phase reaction, A 3B , between no conversion and complete conversion is
18114. Which item appears in liability side of a Balance Sheet?
18115. Maximum allowable concentration of CO2 in air for safe working is __________ ppm (parts per million).
18116. Tolerable limit of nitrogen oxides in air is __________ ppm.
18117. Iron & manganese present as pollutant in water can not be removed by
18118. In water chemical treatment plant, use of chloramines ensures
18119. Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ?
18120. During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum ?
18121. H2S present in gaseous stream can be removed by adsorption on
18122. Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes
18123. Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by
18124. Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to
18125. Smoke is produced due to
18126. Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.
18127. Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO2 in air is __________ ppm.
18128. Main pollutants released from iron & steel industry is
18129. Exposure to chemicals having carcinogenic properties cause
18130. Scale formation in boiler is controlled by
18131. Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.
18132. TLV of mercury in potable (drinking) water is about __________ ppm.
18133. Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?
18134. Which is a secondary air pollutant ?
18135. Which of the following is the most detrimental for water used in high pressure boiler ?
18136. Turbidity of water is an indication of the presence of
18137. Presence of excess flourine in water causes
18138. Siderosis is a disease caused by the inhalation of __________ dust.
18139. Which of the following pollutants is not emitted during volcanic eruptions ?
18140. The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
18141. Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by
18142. Which of the following dust collection equipments is the least efficient (for sub-micronic particles) ?
18143. Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is
18144. Dust collection efficiency of a cyclone separator depends upon its
18145. Ionisation potential employed in the industrial electrostatic precipitator is of the order of
18146. The widest explosive limit is of __________ , thereby making it the most explosive gas.
18147. Aerobic biological oxidation ponds used for the purification of polluted water
18148. Polluted water having low BOD are most economically treated in
18149. Tri-sodium phosphate is used in boiler water treatment to reduce
18150. The commonest form of iron & manganese found in ground water as pollutant is in the form of their