Steam enters a turbine with a pressure of 3.0 MPa and temperature of 400°C. Saturated vapor at 100°C leaves the turbine. At steady state, the turbine develops work in the amount of 540 kJ/kg of steam flowing through the turbine. Ignore the heat loss from the turbine to its surroundings. Determine the rate of heat transfer per kg of steam flowing. a. - 17.8 kJ/kg b. - 14.8 kJ/kg c. - 20.8 kJ/kg d. - 1094.8 kJ/kg

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

What is a monomer? how do they form a ploymer from the view point of chemical bonding?

A)-explain briefly the importance of standards in engineering design. b)- what is patent? c)-explain the relationship between these standards: b. s. and b. s.en d)- in engineering design concepts, types of loads and how they act are important factors. explain.