You are selecting a bearing to support a radial load of 2 kN where the shaft will rotate at a speed of 520 rev/min. Consider a journal bearing: The bearing diameter is 2.0024 in and the journal diameter is 2 in. The bearing length is 1 in. If the Sommerfeld number is S=0.06, what is the friction coefficient if you assume the bearing is concentric? What if the bearing cannot be assumed to be concentric?

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

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

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?