RCDD TEST QUESTIONS | 100% Correct Answers | Verified | Latest 2024 Version

If the input signal power to a communication system is 1 W and the output power is 1 mW, the system attenuation is: A. 3 dB B. 20 dB C. 30 dB D. 40 dB E. 1000 dB - C. 30 dB The signal at the input to a balanced twisted pair cable is 10 mW. The cable is 1000 feet long and has an attenuation of 1 dB per 100 feet. This cable is connected to the input of a receiver. The noise level at the input to the receiver is 1 microwatt. What is the signal-to- noise ratio (SNR) (dB) at the receiver input? A. 10 dB B. 30 dB C. 40 dB D. 60 dB E. 100 dB - B. 30 dB A SONET OC-1 channel can carry 672 voice signals and has a data rate of 51.84 Mbps. ASONET OC-48 channel can carry 32,256 voice channels. What MINIMUM data rate is required for the OC-48 channel? A. 155 Mbps B. 622 Mbps C. 2.5 Gbps D. 5 GbpsE. 10 Gbps - C. 2.5 Gbps All of the following are nominal wavelengths for laser light sources EXCEPT: A. 700 nm B. 850 nm C. 1300 nm D. 1310 nm E. 1550 nm - A. 700 nm A video camera has a coaxial cable output. The video signal is to be distributed to devices that have balanced twisted pair inputs. The transition between these two different transmission media can be accomplished by using a: A. Balun B. Converter C. Modulator D. Cross connect E. Transceiver - A. Balun The public telephone system is an example of a __________ system. A. Simplex B. Half-duplex C. Full-duplex D. Purely analog E. Purely digital - C. Full-duplex Wave division multiplexing (WDM) is most similar to:A. Amplitude modulation B. Frequency modulation C. Time division multiplexing D. Frequency division multiplexing E. Carrier sense multiple access with collision detection (CSMA/CD) - D. Frequency division multiplexing You must place CAT6 cable above a factory floor with automated welding machines and hammer forges. Of the following, what type of shielding would be most effective? A. Multi-layer braid B. Foil and braid C. Solid metallic conduit D. Flex metallic conduit E. Sch. 40 PVC conduit - C. Solid metallic conduit You must place a cable between 2 equipment locations with separate grounds having a potential difference between them of 2.1 V rms. Which one of the following cables should NOT be used? A. Multimode B. Singlemode C. UTP D. STP - D. STP Two sinusoidal signals have the same amplitude (A) and the same frequency (f). They differ in phase by 180 degrees. If these two signals are added together, the result is a sinusoidal signal having an amplitude of: A. ZeroB. 0.707A and a frequency of f C. A and a frequency of 2f D. 2A and a frequency of f E. 2A and a frequency of 2f - A. Zero Composite conductors, although not generally recommended, may be used in special circumstances because they provide all of the following advantages EXCEPT: A. Have good digital transmission characteristics B. Lightweight C. Inexpensive D. Easy to produce E. Easily embedded into other materials - A. Have good digital tran