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7.5. Polarisation
A subsection of Physics, 9702, through 7. Waves
Listing 10 of 24 questions
A coaxial cable is frequently used to connect an aerial to a television receiver. Such a cable is illustrated in . insulator copper core copper braid plastic covering Suggest two functions of the copper braid. 1. 2. Suggest two reasons why a wire pair is not usually used to connect the aerial to the receiver. 1. 2. The coaxial cable connecting an aerial to a receiver has length 14 m. The cable has an attenuation per unit length of 190 dB km−1. Calculate the fractional loss in signal power during transmission of the signal along the cable. fractional loss =
9702_w17_qp_43
THEORY
2017
Paper 4, Variant 3
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A section of a coaxial cable is shown in . copper wire copper braid plastic covering insulation Suggest two functions of the copper braid. 1. 2. Suggest one application of a coaxial cable for the transmission of electrical signals. The constant noise power in a transmission cable is 7.6 μW. The minimum acceptable signal-to-noise ratio is 32 dB. Calculate the minimum acceptable signal power PMIN in the cable. PMIN = W The input power of the signal to the transmission cable is 2.6 W. The attenuation per unit length of the cable is 6.3 dB km–1. Use your answer in to determine the maximum uninterrupted length L of cable along which the signal may be transmitted. L = km
9702_w19_qp_41
THEORY
2019
Paper 4, Variant 1
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A section of a coaxial cable is shown in . copper wire copper braid plastic covering insulation Suggest two functions of the copper braid. 1. 2. Suggest one application of a coaxial cable for the transmission of electrical signals. The constant noise power in a transmission cable is 7.6 μW. The minimum acceptable signal-to-noise ratio is 32 dB. Calculate the minimum acceptable signal power PMIN in the cable. PMIN = W The input power of the signal to the transmission cable is 2.6 W. The attenuation per unit length of the cable is 6.3 dB km–1. Use your answer in to determine the maximum uninterrupted length L of cable along which the signal may be transmitted. L = km
9702_w19_qp_43
THEORY
2019
Paper 4, Variant 3
View
Questions Discovered
24