Engineering, 20.08.2020 21:01 cbbentonam72

4. The input impedance to a transmission with characteristic impedance Zo connected to a load ZL is given below tan tan L o in o o L Z jZ l Z Z Z jZ l            where 2    , l is the length of the transmission line(usually given in wavelengths) and λ is the wavelength. a) Sketch Zin vs l (in wavelengths) if ZL=0, (i. e. a short circuit). What is the range of values for Zin? b) Repeat part a if ZL =[infinity] (i. e. an open circuit). c) How do the short circuited and open circuited transmission lines compare? d) How would the input impedance vary with length is ZL=75Ω and Zo=50Ω? e) In general, how does the input impedance of a terminated transmission line vary with distance from the load?

Answers: 2

Show answers

Another question on Engineering

Engineering, 03.07.2019 14:10

Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.

Answers: 2

Answer

Engineering, 04.07.2019 18:10

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?

Answers: 1

Answer

Engineering, 04.07.2019 18:10

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2

Answers: 3

Answer

Engineering, 04.07.2019 18:10

Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux

Answers: 3

Answer

You know the right answer?

4. The input impedance to a transmission with characteristic impedance Zo connected to a load ZL is...

Questions