GATE CH case studies
GATE CH · Put your knowledge to work in context.
GATE (Graduate Aptitude Test in Engineering) is a national-level examination that primarily tests the comprehensive understanding of various undergraduate subjects in Engineering/Technology/Architecture/Science/Commerce/Arts/Humanities. The CH test paper is the Chemical Engineering paper within this family of 30 test papers, which comprise full papers and sectional papers. The GATE CH case studies are 5 cases and about 2,918 words.
1Sieve-Tray Column Flooding After a Purity Excursion
A 1.6 m diameter sieve-tray column with 24 trays at 0.45 m spacing separates methanol from water near atmospheric pressure. At the design case, boilup is 3.0 kg/s of vapor (density 1.15 kg/m3) and reflux ratio is 1.8; the column runs at about 70% of flood and meets 99.5% distillate purity.
599 words, about 3 min2Batch Reactor Cooling Failure and Emergency Quench Decision
A 5 m3 jacketed batch reactor is charged with 4.0 m3 of solution containing 1.5 kmol/m3 of a limiting reactant in an organic solvent (density 850 kg/m3, cp 2.2 kJ/kg K). The reaction has delta H = -180,000 kJ/kmol.
585 words, about 3 min3Crude Preheat Exchanger Fouling and Cleaning Economics
A crude preheat exchanger is designed to heat 20 kg/s of crude oil (cp = 2.0 kJ/kg K) from 30°C to 110°C using 20 kg/s of hot residue (cp = 2.4 kJ/kg K) entering at 200°C. The unit is a single shell-and-tube exchanger with 100 m2 of area.
547 words, about 3 min4Centrifugal Pump Cavitation in Vacuum Column Service
A centrifugal pump takes 120 m3/h of a toluene-like liquid (density 830 kg/m3, vapor pressure 18 kPa abs at 60°C) from the bottom of a vacuum column operating at 30 kPa abs. The pump is located 3.5 m below the column liquid level.
589 words, about 3 min5Reflux Drum Level Cycling Caused by Valve Stiction
A reflux drum level controller on a distillation column uses a PID with gain 2, integral time 10 min, and derivative 0. The level has cycled with a period of 22 min and a peak-to-peak amplitude of 0.35 m for three days.
598 words, about 3 min