Polyvinyl chloride is produced by
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
September 2023
In connection with petroleum refining, identify the incorrect statement among the following options
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 is a petroleum product D. Cetane number indicates the quality
Segmental baffles in a 2-4 shell and tube heat exchanger
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 the tubes and increase
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Critical speed of a ball mill depends on
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
The terminal velocity of a spherical particle in gravitational settling under Stokes’ regime varies
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: directly with the square of particle diameter
A watch uses two electronic circuits (ECs). Each EC has a failure probability of 0.1 in one year of operation
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) 0.90 (C) 0.81 (D) 0.80 Ans: 0.81
An aerial photograph of a terrain having an average elevation of 1400 m is taken at a scale of 1:7500
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
A 7.5 m wide two-lane road on a plain terrain is to be laid along a horizontal curve of radius 510 m
Q. A 7.5 m wide two-lane road on a plain terrain is to be laid along a horizontal curve of radius 510 m. For a design speed of 100 kmph, super-elevation is provided as per IRC: 73- 1980. Consider acceleration due to gravity as 9.81 m/s2. The level difference between the inner and outer edges
The space mean speed (kmph) and density (vehicles/km) of a traffic stream are linearly related
Q. The space mean speed (kmph) and density (vehicles/km) of a traffic stream are linearly related. The free flow speed and jam density are 80 kmph and 100 vehicles/km respectively. The traffic flow (in vehicles/h, up to one decimal place) corresponding to a speed of 40 kmph is Ans: 2000 Sol:
A schematic flow diagram of a completely mixed biological reactor with provision for recycling of solids
Q. A schematic flow diagram of a completely mixed biological reactor with provision for recycling of solids is shown in the figure. S0, S = readily biodegradable soluble BOD, mg/L Q, Qr, Qw = flow rates, m3/d X0, X, Xe, Xu = microorganism concentrations (mixed-liquor volatile suspended solids or MLVSS), mg/L The mean cell residence