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.

Afour cylinder four-stroke in-line engine has a stroke of 160mm, connecting rod length of 150mm, a reciprocating mass of 3kg and its firing order is 1-3-4-2. the spacing between cylinders is 100mm. i. show that the engine is in balance with regard to the primary inertia forces and primary 3. a and secondary inertia couples. li determine the out of balance secondary inertia force ii. propose ways of balancing this out of balance force and discuss the challenges that will arise