RCDD Practice Test Questions And Answers Graded A+ 2024/25.

RCDD Practice Test Questions And Answers Graded A+ 2024/25. C - correct answer. 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 B - correct answer. 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 C - correct answer. 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 Gbps E. 10 Gbps A - correct answer. 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 - correct answer. 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 C - correct answer. The public telephone system is an example of a __________ system. A. Simplex B. Half-duplex C. Full-duplex D. Purely analog E. Purely digital D - correct answer. 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) C - correct answer. 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 D - correct answer. 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 shouldNOT be used? A. Multimode B. Singlemode C. UTP D. STP A - correct answer. 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. Zero B. 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 - correct answer. 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 D - correct answer. Which is an advantage of stranded conductors over solid conductors? A. Less costly B. Simpler terminations C. Better high frequency performance D. More flexible E - correct answer. The conversion of an analog speech signal to a pulse code modulation (PCM) digital signal involves all of the following steps EXCEPT: A. Low pass filtering B. Periodic sampling C. Quantizing D. Companding E. Amplitude modulation B - correct answer. Assume that the optical power transmitted by a 62.5/125 multimode fiber is distributed uniformly across its core. If this fiber is perfectly coupled (i.e., the two fibers are aligned and abutted) to a 50/125 fiber, what is the percent of power that is lost? A. 0 percent B. 36 percent C. 50 percent D. 80 percent E. 100 percent A - correct answer. Which of the following correctly lists the lowest frequency band to the highest frequency band? A. MF, HF, VHF, UHF B. UHF, VHF, HF, MF C. HF, MF, UHF, VHF D. VHF, UHF, MF, HF E. HF, MF, UHF, VHF B - correct answer. Time division multiplexing (TDM) systems are designed to transport ________ between end point systems. A. Only analog signals B. Only digital signals C. A mix of both analog and digital signals D. Both analog and digital signals, but only one type at a time C - correct answer. A reasonable approximation for the signal speed in 100 ohm balanced twisted pair cable is__________, where c is the velocity of light in free space. A. 0.2 c B. 0.4 c C. 0.6 c D. 08 c E. 0.9 c C - correct answer. Which characteristic is an advantage of copper based media over optical fiber cable? A. Weight B. Corrosion resistance C. Ability to handle analog signals D. Susceptibility to EMI E. Very high data rates A - correct answer. Which electrical characteristic is displayed with the correct preferred value? A. Dielectric constant - high value B. Dielectric strength - high value C. Dissipation factor - low value D. Insulation resistance - high value E - correct answer. Optical transmitters are typically one of the following types EXCEPT: A. Light-emitting diode (LED) B. Short wavelength laser compact disc (CD) C. Vertical cavity surface emitting laser (VCEL) D. Laser diode (LD) E. Overfilled launch (OFL) A - correct answer. You are placing Category 6 unshielded twisted-pair (UTP) in cable tray down a hallway past the elevator mechanical room. What action should you take to avoid effects of electromagnetic interference (EMI)?