RCDD Exam | Questions with 100% Correct
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Terms in this set (357)
If the input signal power to a C
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
,The signal at the input to a balanced B
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
A SONET OC-1 channel can carry 672 C
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
All of the following are nominal A
wavelengths for laser light sources
EXCEPT:
A. 700 nm
B. 850 nm
C. 1300 nm
D. 1310 nm
E. 1550 nm
,A video camera has a coaxial cable A
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
The public telephone system is an C
example of a __________ system.
A. Simplex
B. Half-duplex
C. Full-duplex
D. Purely analog
E. Purely digital
Wave division multiplexing (WDM) is D
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)
, You must place CAT6 cable above a C
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
You must place a cable between 2 D
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
Two sinusoidal signals have the same A
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
Answers | Verified | Latest Update 2026
Save
Terms in this set (357)
If the input signal power to a C
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
,The signal at the input to a balanced B
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
A SONET OC-1 channel can carry 672 C
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
All of the following are nominal A
wavelengths for laser light sources
EXCEPT:
A. 700 nm
B. 850 nm
C. 1300 nm
D. 1310 nm
E. 1550 nm
,A video camera has a coaxial cable A
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
The public telephone system is an C
example of a __________ system.
A. Simplex
B. Half-duplex
C. Full-duplex
D. Purely analog
E. Purely digital
Wave division multiplexing (WDM) is D
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)
, You must place CAT6 cable above a C
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
You must place a cable between 2 D
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
Two sinusoidal signals have the same A
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
