Use Norton’s Theorem to find the followings for the circuit having the load resistor (6 kΩ) (i) Find RN. (ii) Find Isc to compute IN. (iii)Find VTh and RTh to compute IN. (iv)Draw the Norton’s equivalent circuit. (v) Find out the voltage across the load resistor (6 kΩ).

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?