Module 4: Telecommunications

Sending, propagating and receiving an analog or digital information signal is called

• transmission

• demodulation

• multiplexing

• refraction

Digital signals consist of

• waveforms

• numbers only

• numbers and letters

• pulses of ON and OFF

The process of sending more than one signal is

• conductance

• channelling

• multiplexing

• transmission

The transmission of information by electromagnetic radiation depends on the process of

• refraction

• translation

• modulation

• digitisation

The name of the instrument used to determine the usable frequencies of the ionosphere

• radar

• ionosonde

• spectrometer

• galvanometer

Communication satellites orbit in

• low orbits

• high orbits

• stationary orbits

• geostationary orbits

The combination of a carrier wave and intelligence wave produces a

• sky wave

• sine wave

• direct wave

• modulated wave

The periodic amplification of optical fibre signals is required due to:

• reflection

• refraction

• dispersion

• digitisation

The alternative term for an analog signal is

• light wave

• radio wave

• direct wave

• continuous wave

Which of the following is arranged in increasing wavelength?

• infrared, radio, gamma rays

• AM, microwave, ultraviolet

• X-ray, infrared, AM radio

• FM, AM, mobile phone