Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to a 760 mm mercury barometer). 250 750 450 650 TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following types of reactors is the safest from operation point of view? A liquid phase catalytic reactor Pot type reactor A vapor phase reactor A liquid phase reactor TRUE ANSWER : ? YOUR ANSWER : ?
The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles? To provide support to the tube bundle To reduce the induced vibration in the tubes To increase the residence time of shell side fluid To increase the tube side heat transfer co-efficient by inducing turbulence TRUE ANSWER : ? YOUR ANSWER : ?
In case of a continuous distillation column, increase in reflux ratio may result in the Greater cost for the condenser coolant Lower fixed charges for the column Greater cost for the reboiler heat supply All of these TRUE ANSWER : ? YOUR ANSWER : ?
Cooling water fouling factors vary in the range of 0.001 to 0.003 (BTU/hr.ft² . °F)⁻¹ (kcal/hr.m² .°C)⁻¹ (W/m².°K)⁻¹ (kcal/hr. m. °C)⁻¹ TRUE ANSWER : ? YOUR ANSWER : ?
A cylindrical storage tank can have a self supported conical roof, Irrespective of its diameter If its diameter is less than 15-20metres If its diameter is more than 50 meters If the thickness of the roof is more than that of the cylindrical shell TRUE ANSWER : ? YOUR ANSWER : ?
What is the slope of the operating line in the stripping section of a distillation column? ? > 1 < 1 TRUE ANSWER : ? YOUR ANSWER : ?
In packed absorption tower, onset of flooding usually occurs at a pressure drop of about __________ mm of water column per metre height of packing. 200-250 50-75 25-50 750-1000 TRUE ANSWER : ? YOUR ANSWER : ?
The ratio of down take area to cross-sectional area of the tube, for calendria type evaporator ranges from 2 to 2.5 1.5 to 2 1 to 1.5 0.5 to 1 TRUE ANSWER : ? YOUR ANSWER : ?
Pick out the wrong statement about distillation operation In flash (equilibrium) distillation, a definite fraction of liquid is vaporised in such a way that the evolved vapour & residual liquids are in equilibrium with each other Distillation under vacuum is a substitute for steam distillation In differential (simple) distillation, the vapour is removed as soon as it is formed without appreciable condensation Flash distillation, differential distillation & steam distillation are all continuous distillation processes TRUE ANSWER : ? YOUR ANSWER : ?