ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2020
For the following questions answer them individually
A bag house is to be designed to handle 1000 m$$^3$$/min of air. The filtration takes place at constant pressure so that the air velocity through each bag decreases during the time between cleaning according to the relation $$u = \frac{1}{0.267 + 0.08t}$$ where,u is in m/min of cloth and t is the time in min. The bags are shaken in sequence row by row on a 30 mincycle. Each bag is 20 cm in diameter and 3 m height. The bag house is to be square in cross-section with 30 cm spacing between bags and 30 cm clearance from the walls. Calculate the minimum number of bags required
A jib crane of a rigid beam BC supported by an elastic rod AB and hinged at C. Determine the deflection of the point B when a load of 16 kN is applied. Take E = 200 GPa. Area of cross section $$(A_c)$$ of elastic rod AB is $$300 mm^2$$.
The power consumption of Vapour Compression Refrigeration System (VCRS) with air cooled condenser compared to VCRS with water cooled system will be higher due to
During turning a metallic rod at a given condition, the tool life was found to increase from 25 min to 50 min, when Cutting velocity $$V_c$$ alone was reduced from 141.4 m/min to 100 m/min. How much will be the life of that tool if machined at 353.5 m/min ?
Estimate the machining time that will be required to finish a vertical flat surface of length 100 mm and depth 20 mm byan 8 teeth HSS (High speed steel) end mill cutter of 32 mm diameter and 60 mm length in a milling machine. Assume cutting velocity $$(V_c) = 30 m/min$$ and feed $$(s_0) = 0.12$$ mm/tooth. Take approach and run over both 2 mm
