Introduction to Communication Systems

The theory of radio waves was originated by:

• Marconi

• Bell

• Maxwell

• Hertz

The person who sent the first radio signal across the Atlantic ocean was:

• Marconi

• Bell

• Maxwell

• Hertz

The transmission of radio waves was first done by:

• Marconi

• Bell

• Maxwell

• Hertz

A complete communication system must include:

• a transmitter and receiver

• a transmitter, a receiver, and a channel

• a transmitter, a receiver, and a spectrum analyzer

• a multiplexer, a demultiplexer, and a channel

Radians per second is equal to:

• $2\pi f$

• $2\pi T$

• the phase angle

• none of the above

When two noise voltages,  $V_1$   and $V_2$  are combined, the total voltage  $V_T$  is: 

Signal-to-Noise ratio is calculated as:

• signal voltage divided by noise voltage

• signal power divided by noise power

• first add the signal power to the noise power, then divide by noise power

• none of the above