ECE Board Reviewer - Circuits

Which of the following best describes the function of a transmission line?

• To guide electromagnetic waves from one point to another

• To amplify signals during transmission

• To convert analog signals to digital

• To modulate carrier waves

What is the characteristic impedance of a typical coaxial cable used in RF transmission?

• 50 ohms

• 75 ohms

• 100 ohms

• 25 ohms

Which phenomenon causes signal distortion due to different frequency components traveling at different speeds?

• Dispersion

• Reflection

• Attenuation

• Impedance mismatch

A standing wave ratio (SWR) of 1:1 indicates what condition on a transmission line?

• Perfect impedance matching

• Open circuit

• Short circuit

• Maximum power loss

The loss of signal strength during transmission is known as:

• Attenuation

• Reflection

• Dispersion

• Radiation

Velocity factor of a transmission line is defined as:

• Ratio of the signal speed in the line to the speed of light

• Signal speed times the dielectric constant

• Speed of light divided by signal frequency

• Impedance of the line divided by resistance

Quarter-wave transformers are used for:

• Impedance matching

• Signal amplification

• Noise suppression

• Voltage regulation

In a transmission line, reflection occurs due to:

• Impedance mismatch

• High frequency

• Low power

• Proper matching

Which type of transmission line is best suited for high-frequency signals?

• Coaxial cable

• Twisted pair

• Fiber optics

• Waveguide

The Smith Chart is used for:

• Solving transmission line problems

• Drawing modulation schemes

• Plotting amplifier responses

• Designing oscillators