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Chapter 20: Problem 2700
In which frequency range, space waves are normally propagated ? (A) HF (B) VHF (C) UHF (D) SHF
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If \(\mathrm{M}_{1} \& \mathrm{M}_{2}\) are the refractive indices of the material of core and cladding of an optical fiber, than the loss of light due to its leakage can be minimized by having (A) \(\mathrm{M}_{1}>\mathrm{M}_{2}\) (B) \(\mathrm{M}_{1}<\mathrm{M}_{2}\) (C) \(\mathrm{M}_{1}=\mathrm{M}_{2}\) (D) None of these
If the band width is \(1.6 \times 10^{12} \mathrm{~Hz}\), how many communication channels can be obtained with \(16 \mathrm{KHz}\) band width radio signal ? (A) \(10^{15}\) (B) \(10^{11}\) (C) \(10^{10}\) (D) \(10^{8}\)
A radio can tune to any station in the 7. \(5 \mathrm{MHz}\) to $12 \mathrm{MHz}$ band. What is the corresponding wave length band? (A) \(400 \mathrm{~m}-250 \mathrm{~m}\) (B) \(40 \mathrm{~m}-25 \mathrm{~m}\) (C) \(4 \mathrm{~m}-2.5 \mathrm{~m}\) (D) None of these
Modulation is used to (A) reduce the band width used (B) separate the transmission of different areas (C) ensure that information may be transmitted to long distance (D) allow the use of practical antennas
The band width of Audio signal is (A) \(20 \mathrm{HZ}\) (B) \(20 \mathrm{KHZ}\) (C) \(20 \mathrm{MHZ}\) (D) \(20 \mathrm{GHZ}\)
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