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# Kennedy: MCQ in Transmission Lines

This is the Multiple Choice Questions in Chapter 7: Transmission Lines from the book Electronic Communication Systems by George Kennedy. If you are looking for a reviewer in Communications Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

#### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. Indicate the false statement. The SWR on a transmission line is infinity; the line is terminated in

a. a short circuit

b. a complex impedance

c. an open circuit

d. a pure reactance

Solution:

2. A (75 โ j50)-โฆ is connected to a coaxial transmission line of ZO = 75 โฆ, at 10 GHz. The best method of matching consists in connecting

a. a short-circuited stub at the load

b. an inductance at the load

c. a capacitance at some specific distance

d. a short-circuited stub at some specific distance from the load

Solution:

3. The velocity factor of a transmission line

a. depends on the dielectric constant of the material used

b. increases the velocity along the transmission line

c. is govern by the skin effect

d. is higher for a solid dielectric than for air

Solution:

4. Impedance inversion may be obtained with

a. a short-circuited stub

b. an open-circuited stub

c. a quarter-wave line

d. a half-wave line

Solution:

5. Short-circuited stubs are preferred to open-circuited stubs because the latter are

a. more difficult to make and connect

b. made of a transmission line with a different characteristic impedance

d. incapable of giving a full range of reactances

Solution:

6. For transmission-line load matching over a range of frequencies, it is best to use a

a. balun

c. double stub

d. single stub of adjustable position

Solution:

7. The main disadvantage of the two-hole directional coupler is

a. low directional coupling

b. poor directivity

c. high SWR

d. narrow bandwidth

Solution:

8. To couple a coaxial line to a parallel-wire line, it is best to use a

a. slotted line

b. balun

c. directional coupler

d. quarter-wave transformer

Solution:

9. Indicate the three types of transmission line energy losses.

a. I2R, R, and temperature L

b. Radiation, I2R, and dielectric heating

c. Dielectric separation, insulation breakdown, and radiation

d. Conductor heating, dielectric heating, and radiation resistance.

Solution:

10. Indicate the true statement below. The directional coupler is

a. a device used to connect a transmitter to a directional antenna

b. a coupling device for matching impedance

c. a device used to measure transmission line power

d. an SWR measuring instrument

Solution:

### Complete List of MCQ in Electronic Communication Systems by Kennedy

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