Astream of air at 35 degree c and a gauge pressure of 0.5 atm (stream 1) flows into a pipe passing through a heater, emerges at 87 degree c and 0.2 atm (gauge), and splits into two streams. stream 2 passes out of the system, and stream 3 goes through another heater and emerges at 180 degree c and 0.1 atm (gauge). flowmeters mounted in all three streams show readings of 3120 l/min (stream 1), 1940 l/min (stream 2), and 3420 l/min (stream 3). (a) show that the system is not functioning properly. (b) speculate on several possible causes of the malfunction, and state how you would check each one.

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

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?

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false