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A 1kW signal is transmitted using a comm...

A 1kW signal is transmitted using a communication channel which provides attrenuation at the rate of -2 d B per km. if the communication channel has a total length of 5 km, the power of the signal received is gain in `dB=10 "log"((P_(0))/(P_(i))) `

A

900 W

B

100 W

C

990 W

D

1010 W

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The correct Answer is:
B
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A 1 KW signal is transmitted using a communication channel which provides attenuatiom at the rate of - 2 dB per km . If the communication channel has a total length of 5 km , the power of the signal received is [ gain in dB = 10 log ((P_(0))/(P_(i)))]

A 1 KW signal is transmitted using a communication channel which provides attenuatiom at the rate of - 2 dB per km . If the communication channel has a total length of 5 km , the power of the signal received is [ gain in dB = 10 log ((P_(0))/(P_(i)))]

Figure (EP) shows a communication system. What is the output power when input signals is of 1.01 mW? [ gain in dB = 10 log_10(P_0//P_t)] .

Figure (EP) shows a communication system. What is the output power when input signals is of 1.01 mW? [ gain in dB = 10 log_10(P_0//P_t)] .

Perhaps, the most commonly used mode of communication involves use of free space as a communication channel between transmitter and receiver. The various possible modes of using of free space have been described below Ground wave communication : This mode is used for low frequency as at high frequency, losses become large. This is useful for distance of the order of 1 km. Space wave communication: The signals are transmitted directly from transmitter to receiver. There is no limit to upper frequency, but its range is limited to few hundred kilometers. The range depends on the height of transmitting antenna Sky wave communication : The signals are sent towards sky They are reflected back towards earth by ionosphere. Its range can be above 500 km. But, very high frequencies (above 10 MHz) are not reflected back. Satellite communication: The signals that cannot be reflected back by ionosphere are reflected back by satellite. Moon is a passive satellite of earth. The frequency range allotted to FM radio broadcast is 88 MHz to 108 MHz. Which of the following communication channels can be used for its transmission? A. Sky wave communication only B. Space wave communication only C. Satellite communication only D. Either space wave communication or satellite communication

(i) The intensity of a light pulse travelling along a communication channel decreases exponentially with distance x according to the relation I = I_0 e^(-alphax) , where I_0 is the intensity at x = 0 and alpha is the attenuation constant. Show that the intensity reduces by 75 percent after a distance of (ln 4)/(alpha) (ii) Attenuation of a signal can be expressed in decibel (dB) according to the relation dB = 10log_10 (I//I_0). What is the attenuation in dB//km for an optical fibre in which the intensity falls by 50 percent over a distance of 50 km?

The reaction 2AX(g)+2B_(2)(g)rarr A_(2)(g)+2B_(2)X(g) has been studied kinetically and on the baiss of the rate law following mechanism has been proposed. I. 2A X hArr A_(2)X_(2) " " ("fast and reverse") II. A_(2)X_(2)+B_(2)rarrA_(2)X+B_(2)X III. A_(2)X+B_(2)rarrA_(2)+B_(2)X where all the reaction intermediates are gases under ordinary condition. form the above mechanism in which the steps (elementary) differ conisderably in their rates, the rate law is derived uisng the principle that the slowest step is the rate-determining step (RDS) and the rate of any step varies as the Product of the molar concentrations of each reacting speacting species raised to the power equal to their respective stoichiometric coefficients (law of mass action). If a reacting species is solid or pure liquid, its active mass, i.e., molar concentration is taken to be unity, the standard state. In qrder to find out the final rate law of the reaction, the concentration of any intermediate appearing in the rate law of the RDS is substituted in terms of the concentration of the reactant(s) by means of the law of mass action applied on equilibrium step. Let the equilibrium constant of Step I be 2xx10^(-3) mol^(-1) L and the rate constants for the formation of A_(2)X and A_(2) in Step II and III are 3.0xx10^(-2) mol^(-1) L min^(-1) and 1xx10^(3) mol^(-1) L min^(-1) (all data at 25^(@)C) , then what is the overall rate constant (mol^(-2) L^(2) min^(-1)) of the consumption of B_(2) ?

A uniform magnetic field B exists in a direction perpendicular to the plane of a square frame made of copper wire. The wire has a diameter of 2 mm and a total length of 40cm. The magntic field changes with time at a steady rate dB/dt = 0.02 T s ^(-1). Find the current induced in the frame. Resistivity of copper =1.7 X 10 ^(-8) Wm .

AAKASH SERIES-COMMUNICATION SYSTEM -LECTURE SHEET (LEVEL - I) (MAIN) (EXERCISE - III) (Straight Objective & More than one Correct Answer Type Questions)
  1. In AM wave, carrier power is given by-

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  2. In AM wave total power of side bands is given by :

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  3. Fraction of total power carried by side bands is given by-

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  4. Modulation factor determines-

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  5. if the maximum and minimum voltage of AM wave are V(max) and V(min), r...

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  6. When m=1 ,power carried by side bands is:

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  7. Which of the following is/are the limitations of amplitude modulation?

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  8. Degree of modulation-

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  9. A signal wave of frequency 12KHz is modulated with a carrier wave of f...

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  10. The antenna current of an AM transmitter is 8A when only the carrier i...

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  11. A 1kW signal is transmitted using a communication channel which provid...

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  12. A speech signal of 3 KHz is used to modulate a carrier signal of frequ...

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  13. A message signal of frequency omega(m) is superposed on a carrier wave...

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  14. 1-V characteristics of four devices are shown in figure. Identif...

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  15. A male voice after modulation transmission sounds like that of a femal...

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  16. Identify the mathematical expression for amplitude modulated wave.

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  17. Audio sine waves of 3 kHz frequency are used to amplitude modulate a c...

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  18. The frequency response curve (figure) for the filter circuit used for ...

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  19. In amplitude modulation, the modulation index m, is kept less than or ...

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  20. An amplitude modulated wave is as shown in Fig. Which of the foll...

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