ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2020

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

The thermostatic expansion valve operates based on

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 heat rejection factor in vapour compression refrigeration system will be

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 ?

Reciprocating motion of the cutting tool in shaping machines is accomplished by

The job reciprocates in which type of machine

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

Which of the following is not generally machined by Ultra Sonic Machining (USM)?