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Electronics and Communication Digital Electronics Difficulty: Medium

Which one of the following is a negative differential resistance diode? Consider the following statements regarding the effect of temperature on the dielectric constant of an insulator. 1. The dielectric constant increases due to thermal energy facilitating the alignment of the dipole with the applied field. 2. The dielectric constant decrease due to the randomizing effect of thermal energy. 3. The dielectric constant decreases due to an increase in the volume of the material. 4. The dielectric constant increases due to the creation of new dipoles. Of these statements The capacitance per unit length and the characteristic impedance of a lossless transmission line are C and Z 0 respectively. The velocity of a travelling wave on the transmission line is A satellite communication link has uplink C/N 0 of 50 dB-Hz and downlink C/N 0 of 47 dB-Hz. What would be overall link C/N 0 ? A signal transmitted from an Earth station bounces back from a geostationary satellite, with an altitude of 35864 km from the Earth surface. The range from the Earth station is 38200 km. The round trip time is about: (excluding processing delays and assuming c = 3 × 10 8 m/s)