In a quadrophonic stereo system, 4 microphones labeled LF (left front), LR(left rear), RF(right front), and RR (right rear) are employed, and the receiver has 4 corresponding speakers positioned around the listener. It is possible to encode this information using the allowed 75 kHz composite baseband bandwidth so that a conventional FM stereo radio or television will behave properly, while a set equipped with 4 speakers will be able to direct the 4 microphone signals to the respective speakers. How can this be accomplished? (Note that this is a tricky question, and partial credit will flow freely.)

If the thermal strain developed in polyimide film during deposition is given as 0.0044. assume room temperature is kept at 17.3 c, and thermal coefficient of expansion for the film and the substrate are 54 x 10^-6c^-1 and 3.3 x 10^-6c^-1respectively. calculate the deposition temperature.

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?