TLMCQ - ESAT

1. Transmission media are usually categorized as

• Fixed or unfixed

• Determinate or indeterminate

• 1. guided or unguided

• 1. metallic or non-metallic

Both twisted pair cable and coaxial cable transmit data in the form of

• Light

• electric current

• induction

• heat

It is the input impedance of a transmission line either infinitely long or terminated in a pure resistance equal to the line impedance

• Characteristic impedance

• 1. source impedance

• Load impedance

• 1.  Iterative Impedance

1. The characteristic impedance of a transmission line does not depend on its

• Length

• conductor spacing

• conductor diameter

• 1. dielectric constant

How many 600kHz waves can be on a 5-mile transmission line simultaneously?

• 16.13

• 18

• 20.25

• 1. 15.25

The transmission lines that permit most efficient transfer of microwave energy are

• Cavity resonators

•  faraday screen

• waveguide

• 1.  coaxial cable

Determine the characteristic impedance of a coaxial cable with an inductance of 0.2uH/ft and capacitance of 16pF/ft.

• 50 ohms

• 60 ohms

• 81.2 ohms

• 111.8 ohms

1. If the 2 towers of a 2MHz antenna are separated by 120 electrical degrees, what is the tower separation in feet?

• 150

• 250

•  500

• 1. 650

1. Which of the following is a major source of loss in a transmission line?

• Dielectric heating

• radiation

•  conductor heating

• 1. all of these

1. The tendency of electrons to confine their travel near the surface of the solid conductor as the frequency of operation increases.

• Capture effect

• Doppler effect

• skin effect

• 1.  flywheel effect