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QUESTION :With amplifiers, both the desired signal and unwanted noise are amplified. This differs from the repeater, which repeats the digital signal without the noise.

True False

QUESTION Given the following information, determine the SNR in decibels at the receiver: transmitted power [Pt]=100 dBW, free space loss [FSL]=80 dB, noise [N]= -10 dBW, power received [Pr]=[Pt]-[FSL], [SNR]=[Pr]-[N] a. [SNR]= 170 dB b. [SNR]= 10 dB c. [SNR]= 190 dB d. [SNR]= 30 dB

QUESTION : What makes a fiber optic (FO) cable work?

a. total internal reflection (TIR) is achieved provided the core and cladding have the same refractive indices

b. FO light propagation only occurs when there is line-of-sight (LOS) between the source and detector

c. light propagation occurs when the refractive index of the core differs from the refractive index of the cladding

d. none of the above

QUESTION Select the correct statement(s) regarding SMF and MMF fiber optic cables

a. since MMF cables support multiple modes of light, it has greater capacity and supports greater distances compared to SMF

b. Both MMF and SMF can be designed with step index or graded cores c. SMF propagates a single mode of light, thus reducing signal distortion d. all of the statements are correct

QUESTION Select the correct statement(s) regarding antenna and RF wave polarization.

a. a vertically polarized RF wave cannot be collected by a horizontally polarized antenna

b. right-hand circular polarization is said to be orthogonal to left-hand circular polarization

c. signals of the same frequency can be transmitted together in an non-interfering manner as long as their polarizations are orthogonal to one another

d. all statements are correct

QUESTION Select the correct statement(s) regarding the Shannon-Hartley Capacity Theorem.

a. the theorem identifies the theoretical maximum bit rate that is achievable based upon signal bandwidth and SNR

b. according to the theorem, an increase in signal bandwidth accompanies an increase in bit rate capacity

c. by increasing signal power, the theorem states that an increase in bit rate can be achieved

d. all of the above are correct statements