An asphalt concrete mixture includes 94% aggregate by total weight. The aggregates consist material passing the 3/8” sieve (94.7%) while materials passing the No. 200 sieve is to be used as the filler (5.3%). The specific gravities of aggregate, filler and asphalt are 2.635, 2.784 and 1.088 respectively if the bulk density of the mix is 147 pcf, determine: 1. Percentage voids in total mix
2. Percentage voids in mineral aggregate
3. Percentage voids with asphalt

When using the ohmmeter function of a digital multimeter, the leads are placed in what position relative to the component being tested? a. parallel b. control c. series d. line

Acompressor receives the shaft work to decrease the pressure of the fluid. 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?