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Principle of Communication Engineering: Basics of Communication System
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Principle of Communication Engineering: Basics of Communication System
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25 Questions

1. Which of the following correctly lists electromagnetic waves in order from longest to shortest wavelength?
2. An electromagnetic wave is traveling to the east.  At one instant at a given point itsE vector points straight up.  What is the direction of its B vector?
3. Thermal noise is a wide sense stationary process.
4. Find the power received by the receiving antenna if it is placed at a distance of 20m from the transmitting antenna which is radiating 50W power at a frequency 900MHz and are made-up of half-wave dipoles.
5. Shot noise is
6. Expression for noise of a two port network considering the noise due to transmission line and other lossy components is:
7. Noise figure can be defined for any microwave network irrespective of any other constraints.
8. Which has the same power spectral density?
9. What is the amount of Electric field present at a distance of 10km for an isotropic radiator with radiating power 3kW?
10. Let’s assume a transmitting antenna having gain 10dB is placed at a distance of 100m from the receiving antenna and radiates a power of 5W. Find the gain of the receiving antenna in dB when the received power is 150?W and transmitter frequency 500MHz?
11. For a Wilkinson power divider of insertion loss L and the coupler is matched to the external circuitry, and then the gain of the coupler in terms of insertion loss is:
12. In Isotropic radiation, which of the following vector component is absent in pointing vector?
13. Thermal noise is
14. What is the wavelength of a 92.9 MHz radio wave?
15. If the distance between the transmitting and receiving antenna is decreased by a factor 2 while other factors remain same, then the new power received by the antenna ___
16. Shot noise is avoidable when current is
17. TheE and B fields in electromagnetic waves are oriented
18. Find the effective length of a receiving antenna with open circuit voltage 1V and incident electric field 200mV/m?
19. If the noise figures of the first stage of a two stage cascade network is 8 dB and the noise figure of the second stage is 7 dB and the gain of the first stage is 10, then the noise figure of the cascade is:
20. What should be the orientation of a straight wire receiving antenna?  It should be placed
21. SQNR can be improved by _______ sampling rate.
22. Which noise is useful for dithering?
23. Noise equivalent temperature of a transmission line that adds noise to the noise of a device is:
24. Which occurs due to equilibrium fluctuations?
25. An ideal source in which the power is radiated equally in all directions is called as __ radiator.

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