Twin-lead transmission lines (tls) are commonly used to connect tv sets and fm radios to their receiving antennas. for the twin-lead, the geometrical factor is gf = π cosh−1 d 2a , where 2a is the diameter of each wire (cylindrical conductor) of the twin lead, and d is the distance between the centers of the wires. assuming = o, µ = µo, and 2a = 1 mm, calculate d for twin lead tl's having: (a) zo = 50 ω and (b) zo = 300 ω.

answer: 500 wph.

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A Carnot heat engine receives heat from a reservoir at 900$^\circ{}$C at a rate of 800 kJ/min and rejects the waste heat to the ambient air at 27$^\circ{}$C. The entire work output of the heat engine is used to drive a refrigerator that removes heat from the refrigerated space at -5$^\circ{}$C and transfers it to the same ambient air at 27$^\circ{}$C. Determine (a) the maximum rate of heat removal from the refrigerated space and (b) the total rate of heat rejection to the ambient air. Answers: (a) 4982 kJ/min, (b) 5782 kJ/min