F04 - Frequencies used in power, audio and radio systems.

The unit if frequency is:
1. The Volt
2. The Hertz
3. The Ohm
4. The Amp
The abbreviation DC stands for
1. Double current
2. Dual Current
3. Dangerous current
4. Direct current
AF stand for
1. Allocated Frequency
2. All Farads
3. Audio Frequency
4. Angular Frequency
The circuit that produces a sine wave is called a(n)
1. oscillator
2. modulator
3. detector
4. audio amplifier
What is the frequency of the mains in the UK?
1. 10 Hz
2. 50 Hz
3. 60 Hz
4. 100 Hz
The range of adult hearing is
1. 0 to 100 Hz
2. 5 Hz to 150 Hz
3. 100 Hz to 15 kHz
4. 10 kHz to 150 kHz
The range of frequencies for radio speech communication is
1. 0 Hz to 300 Hz
2. 300Hz to 3kHz
3. 3 kHz to 13kHz
4. 10kHz to 30 kHz
The VHF frequency range goes from
1. 0MHz -30MHz
2. 30MHz to 300MHz
3. 300MHz to 3000MHz
4. 3000MHz to 10000MHz
Frequency bands are allocated to
1. Different countries (e.g. France, England etc)
2. Different continents (e.g. Asia, N America)
3. Different Time Zones
4. Different services (e.g. marine, aeronautical etc)
Using the above graph, what would be the wavelength in metres of a 25MHz signal?
1. 12m
2. 14m
3. 16m
4. 18m