Quiz V6.0 Electronics and Radio. 10 Questions.Credits to: JimBAttempt All Questions.
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| Q1:The frequency of a radio signal is 152.5Mhz, what is the approximate wavelength? 200 metres 20 metres 2 metres 20 | |||||||||||||||||||||||||||
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| Q2: A 100Mhz sinewave is amplitude modulated (modulation depth is 50%) with a 15khz square wave.
If we look at the resulting signal with a spectrum analyser, we will see individual components at: 100Mhz only 100Mhz and 15khz only 100Mhz, 100.015Mhz, 100.045, 100.075, 99.985, 99.955, 99.925 and some other frequencies You cannot use AM at 100Mhz, only FM. | ||||||||||||||||||||||||
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| Q3: A superheterodyne radio receiver, with an intemediate frequency of 450khz is tuned to receive a signal on 2200khz.
It also receives an unwanted signal on 2.650Mhz.
This problem is due to: Harmonics Mixer overload Poor image rejection Local oscillator drift | |||||||||||||||||||||
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| Q4: The practical bandwidth required for a frequency modulated signal is given by the expression BW = 2 x (deviation + highest modulating frequency).
This is known as: Carsons Rule Blondies Rule Tucos Rule The expression is wrong | ||||||||||||||||||
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| Q5: A 50Mhz radio transmitter is designed to output 10 watts of RF into a 50 ohm load.
A single wire antenna 3metres long is connected directly to the antenna socket.
The transmitter will: Operate correctly Transmit a stronger signal because the antenna is longer than required Transmit a weaker signal because the antenna is shorter than required Operate in an undefined manner | |||||||||||||||
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| Q6: An amplifier has a gain of 20dB, the input and output impedances are the same,
What is the voltage gain of this amplifier: 10 20 33.33 5 | ||||||||||||
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| Q7: The Q of a coil refers to: The number of turns The resistance of the wire The reactance The ratio of resistance and reactance | |||||||||
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| Q8: A 20Mhz tuned circuit has a Q of 100.
The 3dB bandwidth will be: Dont know, depends if it is series or parallel tuned 1 Mhz 20khz 200khz | ||||||
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| Q9: The range of a 200mW 450Mhz handheld radio is: 500Meters 5kM 10km or more Depends on the height of the radios at each end of the link. | |||
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| Q10: In order to correctly receive a single sideband suppressed carrier signal, a receiver must have:
Good sensitivity A narrow IF filter A Beat Frequency Oscillator (BFO) or Carrier Insertion Oscillator (CIO) A low distortion audio amplifier | |
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