Communication Systems questions
74 published questions with worked solutions.
- A diode detector is used to detect an amplitude modulated wave of 60% modulation by using a condenser of capacity 250 pico farad...Not in JEE or NEET syllabus
- In amplitude modulation, sinusoidal carrier frequency used is denoted by _c and the signal frequency is denoted by _m. The...Not in JEE or NEET syllabus
- A carrier wave of peak voltage 14 V is used for transmitting a message signal. The peak voltage of modulating signal given to...Not in JEE or NEET syllabus
- In a line of sight radio communication, a distance of about 50 km is kept between the transmitting and receiving antennas. If the...Not in JEE or NEET syllabus
- A signal A cos ωt is transmitted using _0 _0t as carrier wave. The correct amplitude modulated (AM) signal is:Not in JEE or NEET syllabus
- The number of amplitude modulated broadcast stations that can be accommodated in a 300 kHz band width for the highest modulating...Not in JEE or NEET syllabus
- The carrier frequency of a transmitter is provided by a tank circuit of a coil of inductance 49 µH and a capacitance of 2.5 nF....Not in JEE or NEET syllabus
- A message signal of frequency 100 MHz and peak voltage 100 V is used to execute amplitude modulation on a carrier wave of...Not in JEE or NEET syllabus
- In a communication system operating at wavelength 800 nm, only one percent of source frequency is available as signal bandwidth....Not in JEE or NEET syllabus
- To double the covering range of a TV transmission tower, its height should be multiplied by:Not in JEE or NEET syllabus
- A 100 V carrier wave is made to vary between 160 V and 40 V by a modulating signal. What is the modulation index?Not in JEE or NEET syllabus
- The modulation frequency of an AM radio station is 250 kHz, which is 10% of the carrier wave. If another AM station approaches...Not in JEE or NEET syllabus
- A TV transmission tower has a height of 140 m and the height of the receiving antenna is 40 m. What is the maximum distance up to...Not in JEE or NEET syllabus
- In an amplitude modulator circuit, the carrier wave is given by, C(t) = 4 sin(20000πt) while modulating signal is given by, m(t)...Not in JEE or NEET syllabus
- An amplitude modulated wave is represented by the expression v_m=5(1+0.6 6280t) (211 10^4t) volts. The minimum and maximum...Not in JEE or NEET syllabus
- A carrier wave with amplitude of 250 V is amplitude modulated by a sinusoidal base band signal of amplitude 150 V. The ratio of...Not in JEE or NEET syllabus
- Two identical antennas mounted on identical towers are separated from each other by a distance of 45 km. What should nearly be...Not in JEE or NEET syllabus
- A carrier signal C(t) = 25 sin(2.512 10^ 10 t) is amplitude modulated by a message signal m(t) = 5 sin(1.57 10^8t) and...Not in JEE or NEET syllabus
- For VHF signal broadcasting, —— km ^2 of maximum service area will be covered by an antenna tower of height 30m if the receiving...Not in JEE or NEET syllabus
- A carrier wave VC(t) = 160 sin(2 10^6t) volts is made to vary between V_ max = 200 V and V_ min = 120 V by a message signal...Not in JEE or NEET syllabus
Page 1Next
Other chapters
Alcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAlternating CurrentAminesAnatomy of Flowering PlantsAncient Indian HistoryAnimal KingdomApplication of DerivativesArea Under CurveAromatic Compounds and Aryl HalidesAtomsBasic Mathematics and LogarithmBinomial TheoremBiodiversity and ConservationBiological ClassificationBiomoleculesBiotechnology and Its ApplicationsBiotechnology: Principles and ProcessesBody Fluids and CirculationBreathing and Exchange of GasesCell Cycle and Cell DivisionCell: The Unit of LifeChemical Bonding and Molecular StructureChemical Coordination and Integration