**EC8651 Important Questions Transmission Lines and RF Systems**

EC8651 Important Questions Transmission Lines and RF Systems Regulation 2017 Anna University free download. Transmission Lines and RF Systems Important Questions EC8651 pdf free download.

**Sample EC8651 Important Questions Transmission Lines and RF Systems**

8.

(i)

The characteristic impedance of a certain transmission line is 682.5-j195.7 ohm. The frequency of operation is 1 KHz. At this frequency, the attenuation constant in the line was observed to be 0.01 neper/km and phase constant 0.035 radians /km. Prepare the line constants R, L, G and C per km of the line.

**EC8651 Important Questions Transmission Lines and RF Systems**

Draw and explain the reflection loss due to mismatch between source and load impedances.

(5)

9.

(i)

An open wire line having R=10.15 ohm/km, L = 3.93 mH/km, G=0.29 μmho/km and C=0.00797 μF/km is 100 km long and terminated in Z0. Solve Z0, α, β and γ.

(7)

BTL 3

Applying

(ii)

Illustrate the Zo and in terms of primary constants.

(6)

10.

(i)

Connect the value of attenuation constant ‘α’ as R/2

+ G/2

, when the series resistance R and shunt resistance G of the transmission line are small but not negligible.

**EC8651 Important Questions Transmission Lines and RF Systems**

Demonstrate the concept of attenuation and phase constant of an infinite line.

(6)

11.

(i)

Analyze the expressions for short circuited and open circuited impedance.

**EC8651 Important Questions Transmission Lines and RF Systems**

Point out the propagation constant of continuously loaded cable.

(7)

12.

(i)

A 2 meter long transmission line with characteristic impedance of 60+j40 is operating at =106 rad/sec has attenuation constant of 0.921 Np/m and phase shift constant of 0 rad/miff the line is terminated by a load of 20+j50,find the input impedance of this line.

**EC8651 Important Questions Transmission Lines and RF Systems**

Simplify the expression for input impedance and transfer impedance of transmission lines.

(6)

13.

(i)

Summarize how an infinite line equal to finite line terminated in its characteristic impedance.

Subject name | Transmission Lines and RF Systems |

Short Name | TLRFS |

Semester | 6 |

Subject Code | EC8651 |

Regulation | 2017 regulation |

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