Exam (elaborations)
RCDD Practice Test Questions and answers | Newest 2024/25
- Course
- Institution
RCDD Practice Test Questions and answers | Newest 2024/25
[Show more]
Content preview
RCDD Practice Test Questions andanswers | Newest 2024/25
C - If the input signal power to a communication system is 1 W and the output power is 1
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
mW, the system attenuation is:
ll ll ll ll ll
A. 3 dB ll ll
B. 20 dB ll ll
C. 30 dB ll ll
D. 40 dB ll ll
E. 1000 dB ll ll
B - The signal at the input to a balanced twisted pair cable is 10 mW. The cable is 1000
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
feet long and has an attenuation of 1 dB per 100 feet. This cable is connected to the input of
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
a receiver. The noise level at the input to the receiver is 1 microwatt. What is the signal-to-
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
noise ratio (SNR) (dB) at the receiver input?
ll ll ll ll ll ll ll ll
A. 10 dB ll ll
B. 30 dB ll ll
C. 40 dB ll ll
D. 60 dB ll ll
E. 100 dB ll ll
C - A SONET OC-1 channel can carry 672 voice signals and has a data rate of 51.84
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
Mbps. ASONET OC-48 channel can carry 32,256 voice channels. What MINIMUM data
ll ll ll ll ll ll ll ll ll ll ll ll
rate is required for the OC-48 channel?
ll ll ll ll ll ll ll
A. 155 Mbps ll ll
B. 622 Mbps ll ll
C. 2.5 Gbps ll ll
D. 5 Gbps ll ll
E. 10 Gbps ll ll
A - All of the following are nominal wavelengths for laser light sources EXCEPT:
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
A. 700 nm ll ll
B. 850 nm ll ll
C. 1300 nm ll ll
D. 1310 nm ll ll
E. 1550 nm ll ll
A - A video camera has a coaxial cable output. The video signal is to be distributed to
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
devices that have balanced twisted pair inputs. The transition between these two different
ll ll ll ll ll ll ll ll ll ll ll ll ll
transmission media can be accomplished by using a:
ll ll ll ll ll ll ll ll
A. Balun ll
B. Converter ll
C. Modulator ll
,D. Cross connect
ll ll
E. Transceiver
ll
C - The public telephone system is an example of a __________ system.
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
A. Simplex ll
B. Half-duplex
ll
C. Full-duplex
ll
D. Purely analog
ll ll
E. Purely digital
ll ll
D - Wave division multiplexing (WDM) is most similar to:
ll ll ll ll ll ll ll ll ll ll ll ll ll
A. Amplitude modulation
ll ll
B. Frequency modulation
ll ll
C. Time division multiplexing
ll ll ll
D. Frequency division multiplexing
ll ll ll
E. Carrier sense multiple access with collision detection (CSMA/CD)
ll ll ll ll ll ll ll ll
C - You must place CAT6 cable above a factory floor with automated welding machines
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
and hammer forges. Of the following, what type of shielding would be most effective?
ll ll ll ll ll ll ll ll ll ll ll ll ll ll
A. Multi-layer braid
ll ll
B. Foil and braid
ll ll ll
C. Solid metallic conduit
ll ll ll
D. Flex metallic conduit
ll ll ll
E. Sch. 40 PVC conduit
ll ll ll ll
D - You must place a cable between 2 equipment locations with separate grounds having
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
a potential difference between them of 2.1 V rms. Which one of the following cables
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
shouldNOT be used?
ll ll ll
A. Multimode ll
B. Singlemodell
C. UTP ll
D. STP ll
A - Two sinusoidal signals have the same amplitude (A) and the same frequency (f). They
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
differ in phase by 180 degrees. If these two signals are added together, the result is a
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
sinusoidal signal having an amplitude of:
ll ll ll ll ll ll
A. Zero ll
B. 0.707A and a frequency of f
ll ll ll ll ll ll
C. A and a frequency of 2f
ll ll ll ll ll ll
D. 2A and a frequency of f
ll ll ll ll ll ll
E. 2A and a frequency of 2f
ll ll ll ll ll ll
A - Composite conductors, although not generally recommended, may be used in special
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
circumstances because they provide all of the following advantages EXCEPT:
ll ll ll ll ll ll ll ll ll ll
A. Have good digital transmission characteristics
ll ll ll ll ll
B. Lightweight
ll
,C. Inexpensive
ll
D. Easy to produce
ll ll ll
E. Easily embedded into other materials
ll ll ll ll ll
D - Which is an advantage of stranded conductors over solid conductors?
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
A. Less costly
ll ll
B. Simpler terminations
ll ll
C. Better high frequency performance
ll ll ll ll
D. More flexible
ll ll
E - The conversion of an analog speech signal to a pulse code modulation (PCM) digital
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
signal involves all of the following steps EXCEPT:
ll ll ll ll ll ll ll ll
A. Low pass filtering
ll ll ll
B. Periodic sampling
ll ll
C. Quantizing
ll
D. Companding
ll
E. Amplitude modulation
ll ll
B - Assume that the optical power transmitted by a 62.5/125 multimode fiber is distributed
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
uniformly across its core. If this fiber is perfectly coupled (i.e., the two fibers are aligned and
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
abutted) to a 50/125 fiber, what is the percent of power that is lost?
ll ll ll ll ll ll ll ll ll ll ll ll ll ll
A. 0 percent
ll ll
B. 36 percent
ll ll
C. 50 percent
ll ll
D. 80 percent
ll ll
E. 100 percent
ll ll
A - Which of the following correctly lists the lowest frequency band to the highest
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
frequency band?
ll ll
A. MF, HF, VHF, UHF
ll ll ll ll
B. UHF, VHF, HF, MF
ll ll ll ll
C. HF, MF, UHF, VHF
ll ll ll ll
D. VHF, UHF, MF, HF
ll ll ll ll
E. HF, MF, UHF, VHF
ll ll ll ll
B - Time division multiplexing (TDM) systems are designed to transport ________
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
between end point systems.
ll ll ll ll
A. Only analog signals
ll ll ll
B. Only digital signals
ll ll ll
C. A mix of both analog and digital signals
ll ll ll ll ll ll ll ll
D. Both analog and digital signals, but only one type at a time
ll ll ll ll ll ll ll ll ll ll ll ll
C - A reasonable approximation for the signal speed in 100 ohm balanced twisted pair
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
cable is__________, where c is the velocity of light in free space.
ll ll ll ll ll ll ll ll ll ll ll ll
A. 0.2 cll ll
B. 0.4 cll ll
, C. 0.6 cll ll
D. 08 c ll ll
E. 0.9 cll ll
C - Which characteristic is an advantage of copper based media over optical fiber cable?
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
A. Weight
ll
B. Corrosion resistance
ll ll
C. Ability to handle analog signals
ll ll ll ll ll
D. Susceptibility to EMI
ll ll ll
E. Very high data rates
ll ll ll ll
A - Which electrical characteristic is displayed with the correct preferred value?
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
A. Dielectric constant - high value
ll ll ll ll ll
B. Dielectric strength - high value
ll ll ll ll ll
C. Dissipation factor - low value
ll ll ll ll ll
D. Insulation resistance - high value
ll ll ll ll ll
E - Optical transmitters are typically one of the following types EXCEPT:
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
A. Light-emitting diode (LED)
ll ll ll
B. Short wavelength laser compact disc (CD)
ll ll ll ll ll ll
C. Vertical cavity surface emitting laser (VCEL)
ll ll ll ll ll ll
D. Laser diode (LD)
ll ll ll
E. Overfilled launch (OFL)
ll ll ll
A - You are placing Category 6 unshielded twisted-pair (UTP) in cable tray down a
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
hallway past the elevator mechanical room. What action should you take to avoid effects of
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
electromagnetic interference (EMI)?
ll ll ll
A. Provide a minimum separation of 1194 mm (47 in)
ll ll ll ll ll ll ll ll ll
B. Provide a minimum separation of 2060 mm (81 in)
ll ll ll ll ll ll ll ll ll
C. Require the architect to install metallic foil shielding on the mechanical room walls
ll ll ll ll ll ll ll ll ll ll ll ll ll
D. Provide RMC/IMC (rigid metallic conduit/intermediate metal conduit) through all areas
ll ll ll ll ll ll ll ll ll ll
within 4.6 m (15 ft) of the mechanical room
ll ll ll ll ll ll ll ll ll
B - You have discovered a common mode current on the metallic cable sheaths of your
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
building riser cables. What is the MOST likely cause for you to investigate?
ll ll ll ll ll ll ll ll ll ll ll ll ll
A. Lack of cable protection
ll ll ll ll
B. Two separate and distinct ground references
ll ll ll ll ll ll
C. Improper secondary protection
ll ll ll
D. Improper physical protection of cable
ll ll ll ll ll
E. Improper placement and/or termination of cables
ll ll ll ll ll ll
B - What is the recommended MINIMUM separation of unshielded twisted-pair (UTP)
ll ll ll ll ll ll ll ll ll ll ll ll ll ll ll
cables from fluorescent light fixtures?
ll ll ll ll ll
A. 77 mm (3 in)
ll ll ll ll
B. 30 mm (5.12 in)
ll ll ll ll
C. 203 mm (8 in)
ll ll ll ll
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller ScholarSuccess. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
73091 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now