SRM University 2007 B.Tech Electronics and Communications Engineering BANK : TRANSMSSION LINES AND WAVES GUIDES - Question Paper

PART - B
1. A transmission line of characteristic impedance Zo is terminated by ZR, derive the expression for the position of attachment and length of a short circuited stub.
2. Explain about the features and applications of Smith Chart.
3. (i) provide detail explanation about the quarter wave transformer
(ii) discuss about single stub matching in detail.
4. A low loss line with Zo = 70 ohms is terminated in an impedance ZR=115-j80 ohms. The wavelength of the transmission is 2.5 meters; using smith chart obtain the following:
i. Standing wave ratio
ii. Maximum and Minimum line impedance
iii. Distance ranging from the load and 1st voltage minimum

5. Determine the length and location of the stub to produce an impedance match on a line of Ro = 600ohms terminated in 200 / 0o ohms. The stub is short circuited at the other end. Verify outcome using Smith chart.
6. A transmission line 52 cm long has a characteristic impedance of 50 ohms. It is terminated in a load of ZR. The VSWR is 2.5. The 1st voltage minima occur at 18cm and second voltage minima 38cm from the load end. Using smith chart, determine ZR and input impedance of the line.
7. A generator having an internal impedance of 50 ohms is connected to a load of 250 ohms by means of a transmission line of characteristic impedance of 50 ohms. For a signal of wavelength 20cm, obtain the location and length of a short circuited stub for maximum transfer of energy to load, use smith chart for solving the issue.
8. An R.F. transmission line with a characteristic impedance of 300 0o is terminated in an impedance of 100 45o ohms. This load is to be matched to the transmission line by using a short circuited stub. With the help of a Smith chart determine the length of the stub and its distance from the load.
9. A transmission line has a characteristics impedance of 300 ? and terminated in a load 150 +j150? . obtain the subsequent using Smith Chart. a) VSWR b) Reflection coefficient
c) Impedance at a distance of 0.1? from the load. d) Position of 1st voltage minimum from the
load.
10. For a load 25 + J50 design a double stub tuner making the distance ranging from stubs ?/8. The distance ranging from the first stub and load is ?/4. presume Z0=50?

UNIT – IV

PART – A

1. Distinguish ranging from transverse electric and transverse magnetic waves
2. Distinguish ranging from phase velocity and group velocity

Earning:   Approval pending.