Q. According to the surface renewal theory, the unit of fractional rate of surface renewal is (A) m2 s-2                   (B) m2 s-1                   (C) m s-1                    (D) s-1 Ans: s-1

Q. The reactant (M) is converted into product (N) in the presence of catalyst in a fixed bed reactor. All the flow rates (F, G, H, P and R) in mol/s, and mole fraction of reactant (M) in these streams (xF, xG, xH, xP and xR) are shown in the diagram. The overall fractional conversion is ...

Q. Liquid phase isomerization of o-xylene to p-xylene using a zeolite catalyst was carried out in a CSTR. Three sets of kinetic data at different temperatures and stirring speeds were obtained as shown below. The operating condition at which the reaction rate is not controlled by external ...

Q. Two packed towers are designed for the same mass velocity of the gas. The first has liquid and gas flow rates of 30 kg/s and 1.2 kg/s, respectively, while the corresponding flow rates in the second tower are 67.5 kg/s and 1.8 kg/s. The ratio of the design diameter of the wider tower to that of ...

Q. The molecular formula of the predominant chemical compound in commercial sugar is (A) C12H22O11               (B) C12H24O12                (C) C6H10O5                    (D) C6H12O6 Ans: C12H22O11

Q. Polyvinyl chloride is produced by A. co-polymerization B. addition-type kinetics C. reacting chlorine with polyethylene D. reacting hydrochloric acid with polyethylene Ans: addition-type kinetics

Q. In connection with petroleum refining, identify the incorrect statement among the following options. A. Desalting of crude oil is done before processing it in atmospheric distillation unit B. A stream of hydrogen is produced in catalytic reforming of naphtha C. Asphalt used for paving ...

Q. Segmental baffles in a 2-4 shell and tube heat exchanger A. change the flow pattern of the tube side fluid and increase the overall heat transfer co- efficient B. increase the heat transfer coefficient in the shell side and support the tubes C. help to reduce the  thermal expansion of ...

Q. Critical speed of a ball mill depends on A. the radius of the mill (shell) and the radius of the particles B. the radius of the mill (shell) and the density of the particles C. the radius of the balls and the radius of the particles D. the radius of the balls and the radius of the ...

Q. The terminal velocity of a spherical particle in gravitational settling under Stokes’ regime varies A. linearly with the particle diameter B. linearly with the viscosity of the liquid C. directly with the square of particle diameter D. inversely with the density of particle Ans: ...

Q. A watch uses two electronic circuits (ECs). Each EC has a failure probability of 0.1 in one year of operation. Both ECs are required for functioning of the watch. The probability of the watch functioning for one year without failure is (A) 0.99                      (B) ...

Q. An aerial photograph of a terrain having an average elevation of 1400 m is taken at a scale of 1:7500. The focal length of the camera is 15 cm. The altitude of the flight above mean sea level (in m, up to one decimal place) is _ Ans: 2520 - 2530 Sol: Average elevation (h) =1400 m, ...