You are given a 4-bit Serial-In-Parallel-Out register composed of D-flip-flops (positive-edge triggered) and the bits shift from left to right (LSB to MSB). Assume that all FFs are in state 0, initially. Given an input stream, 11010110, answer the following questions: a. Draw the timing diagram for the first 4 clock pulses (time steps), representing the clock signal and the FF states. b. What are the output values between the 6th and 7th clock pulses (ie, the positive edge of the 6th clock pulse has happened, and the positive edge of the 7th clock is yet to happen)?

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?