Communication Systems

JEE Main Physics · 24 questions · not in the 2024+ syllabus

All questions, latest first

• The height of transmitting antenna is 180 m and the height of the receiving antenna is 245 m. The maximum distance between them…202315 April, Shift 1 · Q42
• To radiate EM signal of wavelength λ with high efficiency, the antennas should have a minimum size equal to:202313 April, Shift 2 · Q50
• Match List - I with List - II Choose the correct answer from the options given below:202313 April, Shift 1 · Q48
• The amplitude of 15 sin (1000 π t) is modulated by 10 sin (4 π t) signal. The amplitude modulated signal contains frequencies of…202312 April, Shift 1 · Q34
• In satellite communication, the uplink frequency band used is:202311 April, Shift 2 · Q41
• A transmitting antenna is kept on the surface of the earth. The minimum height of receiving antenna required to receive the…202311 April, Shift 1 · Q31
• A message signal of frequency 3 kHz is used to modulate a carrier signal of frequency 1.5 MHz. The bandwidth of the amplitude…202310 April, Shift 2 · Q42
• A carrier wave of amplitude 15 V is modulated by a sinusoidal base band signal of amplitude 3 V. The ratio of maximum amplitude…202310 April, Shift 1 · Q42
• The power radiated from a linear antenna of length l is proportional to (Given, λ= Wavelength of wave):20238 April, Shift 2 · Q42
• A TV transmitting antenna is 98 m high and the receiving antenna is at the ground level. If the radius of the earth is 6400 km,…20238 April, Shift 1 · Q41
• For an amplitude modulated wave the minimum amplitude is 3 V, while the modulation index is 60 %. The maximum amplitude of the…20236 April, Shift 2 · Q41
• By what percentage will the transmission range of a TV tower be affected when the height of the tower is increased by 21\%?20236 April, Shift 1 · Q31
• In an amplitude modulation, a modulating signal having amplitude of X V is superimposed with a carrier signal of amplitude Y V in…20231 February, Shift 2 · Q20
• Which of the following frequencies does not belong to FM broadcast.20231 February, Shift 1 · Q2
• Given below are two statements: Statement I: For transmitting a signal, size of antenna ( l ) should be comparable to wavelength…202331 January, Shift 2 · Q19
• The amplitude of 15 sin (1000 π t) is modulated by 10 sin (4 π t) signal. The amplitude modulated signal contains frequency (ies)…202331 January, Shift 1 · Q3
• Match List I with List II: Choose the correct answer from the options given below:202330 January, Shift 2 · Q8
• A sinusoidal carrier voltage is amplitude modulated. The resultant amplitude modulated wave has maximum and minimum amplitude of…202330 January, Shift 1 · Q20
• The modulation index for an A.M. wave having maximum and minimum peak-to-peak voltages of 14 mV and 6 mV respectively is-202329 January, Shift 2 · Q20
• If the height of transmitting and receiving antennas are 80 m each, the maximum line of sight distance will be: Given: Earth's…202329 January, Shift 1 · Q17
• Match List I with List II Choose the correct answer from the options given below:202325 January, Shift 2 · Q5
• A message signal of frequency 5 kHz is used to modulate a carrier signal of frequency 2 MHz. The bandwidth for amplitude…202325 January, Shift 1 · Q20
• Match List I with List II Choose the correct answer from the options given below:202324 January, Shift 2 · Q10
• A modulating signal is a square wave, as shown in the figure. If the carrier wave is given as c(t)=2 sin (8 π t) volts, the…202324 January, Shift 1 · Q10