A 15 MW, 132 kV, 80% pf three phase load is to be serve by a transmission line having conductors whose resistance is 0.5 ohm/km. If the losses on the line shall not exceed 4.5%, how long must this line be?

(a)  

A 10-km, three-phase transmission line delivers power to a load rated 200 kW 6.9 kV and at 80% lagging power factor. The resistance and reactance of each line are 0.8 and 1.2 ohms, respectively. What percentage of the power generated is lost in the transmission line?

(a)  

What is the approximate line impedance of a parallel-strip line spaced 1 cm apart with the length of 50 cm?

(a)  

A quarter wave transformer is connected to a parallel wire line in order to match the line to a load of 1000 ohms. The transformer has a characteristic impedance of 316.23 ohms. The distance between centers is 4 inches. What is the percentage reduction in the diameter of the line?

(a)  

What is the diameter of a copper wire to be used in a 16 km loop with a dc loop resistance of 100 ohms/km?

(a)  

A radio transmission line of 300 ohms impedance is to be connected to an antenna having an input impedance of 150 ohms. What is the impedance of a quarter-wave matching line?

(a)  

If a 6 GHz signal is applied to a rectangular waveguide and the reflection angle is 200, what is the value of the guide wavelength?

(a)  

A short line has a resistance of 4 ohms and a reactance of 12 ohms per wire and transmits power to a concentrated load of 1000 kVA, 13,200 volts, 3-phase, 60 Hz, 0.8 pf inductive load. Find its efficiency.

(a)  

A short 3-phase, 3-wire transmission line has an impedance of 2 + j6 ohms per wire, at the receiving end are connected a 3-phase inductive load drawing 5,000 kw at 0.8 pf, line to line voltage of 13,800 V and a capacitor bank drawing 200 A line current. Solve for the power at the sending end.

(a)