Question 1 Two gas tanks are connected by a cylindrical tube, of length 20 cm and radius 1.5 mm. As shown in the diagram, a valve, which allows ideal gases to be exchanged between the two tanks, is positioned between the tanks and is initially closed. Both gases are initially at 25 °C. 0.002 m³ Valve 0.001 m³ 4/5 1/5 101 kPa 10 kPa The valve is now opened and gas is allowed to flow in the tube at constant temperature. What is the pressure in the 0.002 m³ tank when the valve is left open and equilibrium is reached? Give your answer to two significant figures and in kPa.

Q1// In a surface condenser, the vacuum maintained is 690 mm of mercury. The barometer reads 750 mm. iF the temperature of the condensate is 20°C , determine:- (a) Mass of air per kg of steam (b) Vacuum efficiency. Assume x=1 .Answer: (3.9 kg/kg) *************************************** *****************************

Design a hydrocooling unit to cool down fruits and vegetables from 30 °C to 5 °C in 20 minutes at a rate of 20,000 kg of fruit or vegetables/h.  The design must fulfill the following requirements: ​ The unit will be an immersion flooded system.  It must be able to cool down and transport the products in chill water. The tank has the following dimensions approximate. three meters wide and up to 90 cm hight. The water will circulate and be cooled through the evaporation section of a refrigeration system. The refrigerant temperature inside the coils will be -2 °C, and the water temperature must not drop below 1 °C and must not exceed 6 °C. Assuming reasonable values for the average density, specific heat, and porosity of the product (the fraction of the volume of air in a box), recommend reasonable values for: ​ The speed of the water through the canal,​ the capacity of the cooling system.​ the compressor power​.

A 5L rigid container contains Acetylene initially at gage pressure and temperature of 100 KPa and 300 K, respectively. Because of the leaks in the fittings of the vessel, the gage pressure dropped to 80KPaand the temperature decrease to 200K, determine the mass of the Acetylene that leaked out.