Rough riders inc. manufactures jeans in the cutting and sewing process. jeans are manufactured in 50-jean batch sizes. the cutting time is 6 minutes per jean. the sewing time is 15 minutes per jean. it takes 5 minutes to move a batch of jeans from cutting to sewing.

a. compute the value-added, non-value-added, and total lead time of this process.

b. compute the value-added ratio. round to one decimal place.

On a average work day more than work place firs are reorted

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

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?