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BCH 451 NEWEST UPDATE FINAL EXAM/ ACTUAL EXAM QUESTIONS WITH CORRECT VERIFIED ANSWERS/ GRADED A+
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BCH 451 NEWEST UPDATE FINAL EXAM/ ACTUAL EXAM QUESTIONS WITH CORRECT VERIFIED ANSWERS/ GRADED A+
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RCDD Practice TestStudy online at https://quizlet.com/_g1qjc8
1. If the input signal power to a communication system C
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
2. The signal at the input to a balanced twisted pair B
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
3. A SONET OC-1 channel can carry 672 voice signals C
and has a data rate of 51.84 Mbps. ASONET OC-48
channel can carry 32,256 voice channels. What MINI-
MUM 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
4. All of the following are nominal wavelengths for laser A
light sources EXCEPT:
A. 700 nm
B. 850 nm
C. 1300 nm
D. 1310 nm
E. 1550 nm
, RCDD Practice Test
Study online at https://quizlet.com/_g1qjc8
5. A video camera has a coaxial cable output. The video A
signal is to be distributed to devices that have bal-
anced twisted pair inputs. The transition between
these two different transmission media can be ac-
complished by using a:
A. Balun
B. Converter
C. Modulator
D. Cross connect
E. Transceiver
6. The public telephone system is an example of a C
__________ system.
A. Simplex
B. Half-duplex
C. Full-duplex
D. Purely analog
E. Purely digital
7. Wave division multiplexing (WDM) is most similar to: D
A. Amplitude modulation
B. Frequency modulation
C. Time division multiplexing
D. Frequency division multiplexing
E. Carrier sense multiple access with collision detec-
tion (CSMA/CD)
8. You must place CAT6 cable above a factory floor with C
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
9. You must place a cable between 2 equipment loca- D
tions with separate grounds having a potential dif-
ference between them of 2.1 V rms. Which one of the
, RCDD Practice Test
Study online at https://quizlet.com/_g1qjc8
following cables shouldNOT be used?
A. Multimode
B. Singlemode
C. UTP
D. STP
10. Two sinusoidal signals have the same amplitude (A) 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
11. Composite conductors, although not generally rec- A
ommended, 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
12. Which is an advantage of stranded conductors over D
solid conductors?
A. Less costly
B. Simpler terminations
C. Better high frequency performance
D. More flexible
13. The conversion of an analog speech signal to a pulse E
code modulation (PCM) digital signal involves all of
the following steps EXCEPT:
A. Low pass filtering
B. Periodic sampling
C. Quantizing
, RCDD Practice Test
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D. Companding
E. Amplitude modulation
14. Assume that the optical power transmitted by a B
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
15. Which of the following correctly lists the lowest fre- A
quency 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
16. Time division multiplexing (TDM) systems are de- B
signed to transport ________ between end point sys-
tems.
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
17. A reasonable approximation for the signal speed in C
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
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