Atmospheric air having dry-bulb and wet-bulb temperatures of 33 and 29 degree c, respectively, enters a well-insulated chamber operating at steady slate and mixes with air entering with dry-bulb and wet-bulb temperatures of 16 and 12 degree c, respectively. the volumetric flow rate of the lower temperature stream is twice that of the other stream. a single mixed stream exits. determine for the exiting stream.
(a) the relative humidity.
(b) the temperature, in degreec.
pressure is uniform throughout at 1 atm. neglect kinetic and potential energy effects.

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

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?

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.