RCDD Chapter 11
Chapter 11 review
- 1.
What is used to calculate the length of a cable by measuring the time it takes a pulse to travel down the cable and back.
- A.
FDR
- B.
TDR
- C.
ADR
- D.
FDT
Correct Answer
B. TDR -
- 2.
When testing balanced twisted pair, If a field test instrument uses the same nominal velocity of propogation (NVP) for all pairs, the reported length will be different for each pair. Standards require that the __________ be used as the basis for the pass/fail decision.
- A.
Average electrical length
- B.
Longest electrical length
- C.
Shortest electrical length
Correct Answer
C. Shortest electrical length -
- 3.
What is the measurement of the time required for a signal to travel from one end of the transmission path to the other end.
- A.
Delay skew
- B.
Wave length
- C.
Frequency delay
- D.
Propogation delay
Correct Answer
D. Propogation delay -
- 4.
What is a measurement of the power reflected from the cabling (in dB).
- A.
Insertion loss
- B.
Return loss
- C.
Delay skew
- D.
Propogation delay
Correct Answer
B. Return loss -
- 5.
What is used to determine the return loss
- A.
The ratio of the reflected voltage to the incident voltage
- B.
The ratio of the induced voltage to the reflected voltage
- C.
The ratio of NEXT loss to insertion loss
- D.
The difference of the reflected voltage to the induced voltage
Correct Answer
A. The ratio of the reflected voltage to the incident voltage -
- 6.
The field-testing acceptance parameters for balanced twisted-pair cabling are:
- A.
Wire map and length
- B.
Insertion loss and return loss
- C.
NEXT, ELFEXT, PSNEXT, and PSELFEXT
- D.
Propogation delay and delay skew
- E.
All of the above
Correct Answer
E. All of the above -
- 7.
What level of instrument accuracy for field testing is defined for measurements up to category 6 and class E cabling?
- A.
Level I
- B.
Level II
- C.
Level IIe
- D.
Level III
- E.
Level IIIe
Correct Answer
D. Level III -
- 8.
What level of instrument accuracy for field testing is defined for measurements up to category 5e and class D cabling?
- A.
Level I
- B.
Level II
- C.
Level IIe
- D.
Level III
- E.
Level IIIe
Correct Answer
C. Level IIe -
- 9.
A cable manufacturer's power sum measurement is required for multipair cables.
- A.
True
- B.
False
Correct Answer
A. True -
- 10.
Power sum measurements across all pairs are practical with field test instruments.
- A.
True
- B.
False
Correct Answer
B. False -
- 11.
Select the true statements about coaxial cabling:
- A.
Used in broadband applications
- B.
Low impedance media, 50 or 75 ohm
- C.
Used with single transmission path
- D.
In the past it was used on local area networks
- E.
All of the above
Correct Answer
E. All of the above -
- 12.
Which of the performance tests below are most often used on coaxial cabling.
- A.
Direct current (dc) loop resistance
- B.
NEXT
- C.
Impedance
- D.
SNR
- E.
Length
Correct Answer(s)
A. Direct current (dc) loop resistance
C. Impedance
E. Length -
- 13.
Which of the performance tests below are most often used on coaxial cabling.
- A.
Time domain reflectometer (TDR)
- B.
Frequency domain reflectometer (FDR)
- C.
Insertion loss
- D.
Attenuation
- E.
Noise
Correct Answer(s)
A. Time domain reflectometer (TDR)
D. Attenuation
E. Noise -
- 14.
When testing coaxial cable, the required tests or acceptance tests depend on what________.
- A.
The length of cable
- B.
The type of cable
- C.
The application
- D.
The installation technique
Correct Answer
C. The application -
- 15.
When testing cables, a Pass* is a passing test within the accuracy range (but at the accuracy limit) of the field test instruments pass/fail boundary. This indicates that the test result should be _________.
- A.
Retake
- B.
Considered a fail
- C.
Viewed with caution
- D.
Treated like all passing grades
Correct Answer
C. Viewed with caution -
- 16.
What provides the ability to identify a specific pair by generating a tone on one end of a pair of conductors.
- A.
Fluke
- B.
Tone generator
- C.
Wand
- D.
Cable tracer
Correct Answer(s)
B. Tone generator
D. Cable tracer -
- 17.
Study picture on page 11-30 know what a nonreflective splice or bend loss looks like and know what a reflective splice looks like.
- A.
Ok
- B.
No
Correct Answer
A. Ok -
- 18.
Telecommunications cabling in premises environments is divided into three basic segments:
- A.
Campus (interbuilding) backbone
- B.
Building (intrabuilding) backbone
- C.
Horizontal and centralized cabling
- D.
All of the above
Correct Answer
D. All of the above -
- 19.
Campus backbone cabling requires extensive testing.
- A.
True
- B.
False
Correct Answer
A. True -
- 20.
When field testing optical fibe cabling, the light source or OTDR must operate within the range of ____________ for multimode testing.
- A.
(800 +-25 nm) or (1310 +-15 nm)
- B.
(850 +-25 nm) or (1310 +-20 nm)
- C.
(850 +-30 nm) or (1300 +-20 nm)
- D.
(800 +-30 nm) or (1300 +-15 nm)
Correct Answer
C. (850 +-30 nm) or (1300 +-20 nm) -
- 21.
When field testing optical fibe cabling, the light source or OTDR must operate within the range of ____________ for singlemode testing.
- A.
(1310 +-10 nm) or (1550 +-20 nm)
- B.
(1300 +-15 nm) or (1500 +-20 nm)
- C.
(1310 +-15 nm) or (1550 +-10 nm)
- D.
(1310 +-5 nm) or (1550 +-5 nm)
Correct Answer
A. (1310 +-10 nm) or (1550 +-20 nm) -
- 22.
When testing multimode fiber for end to end attenuation, wrap the test jumper attached to the source with five non-consecutive turns around a specifically-sized _________.
- A.
Barrel
- B.
Cork
- C.
Mandrel
- D.
Wheel and Bob
Correct Answer
C. Mandrel -
- 23.
The mandrel diameters are based on nominal values of _____ and ______ reduced by the cable diameter and rounded up.
- A.
10 mm (0.4 in) and 12.5 mm (0.5 in)
- B.
20 mm (0.8 in) and 25 mm (1 in)
- C.
15 mm (0.6 in) and 18 mm (0.75 in)
- D.
25 mm (1 in) and 51 mm (2 in)
Correct Answer
B. 20 mm (0.8 in) and 25 mm (1 in) -
- 24.
Additional equipment used for optical fiber troubleshooting include a visual light source, also called what:
- A.
Optical fiber laser
- B.
Optical fiber light-emitting diode (LED)
- C.
Optical VCSEL
- D.
Optical flashlight
- E.
Optical beam diode
Correct Answer(s)
B. Optical fiber light-emitting diode (LED)
D. Optical flashlight -
- 25.
When wire mapping a cable, if the display shows 1--3, 2--6, 3--1, 4--4, 5--5, 6--2, then the wires are:
- A.
Reversed
- B.
Transposed
- C.
Split pair
Correct Answer
B. Transposed -
- 26.
What is used to calculate the length of a cable by measuring the time it takes to travel down the cable and back. (round trip delay)
- A.
FDR
- B.
TDR
- C.
DMM
- D.
ACR
Correct Answer
B. TDR -
- 27.
Insertion loss was formerly known as:
- A.
Resistance
- B.
Echo
- C.
Attenuation
- D.
Delay
Correct Answer
C. Attenuation -
- 28.
What is the measure of the power reflected from the cable. (in dB)
- A.
Delay skew
- B.
Echo
- C.
Signal to Noise ratio
- D.
Return loss
- E.
Insertion loss
Correct Answer
D. Return loss -
- 29.
The larger the value of return loss the better the performance.
- A.
True
- B.
False
Correct Answer
A. True -
- 30.
The larger the value of insertion loss the better the performance.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Smaller value is betterRate this question:
-
- 31.
The larger the value of NEXT loss in dB, the better performance.
- A.
True
- B.
False
Correct Answer
A. True -
- 32.
The larger the value of ELFEXT loss in dB, the better the performance.
- A.
True
- B.
False
Correct Answer
A. True -
- 33.
Which of the following is not a field testing acceptance parameters for balanced twisted-pair cabling.
- A.
Length
- B.
NEXT loss
- C.
Slice loss
- D.
Return loss
- E.
Insertion loss
Correct Answer
C. Slice loss -
- 34.
When field testing multipair or higher cabling, it is recommended that the cable be tested for the appropriate category (e.g. cat3 or cat 5e) in _________ pair increments as the pairs are configured in links.
- A.
2 pair
- B.
3 pair
- C.
4 pair
- D.
5 pair
- E.
6 pair
Correct Answer
C. 4 pair -
- 35.
Which of the below tests are not normally performed on coaxial cabling
- A.
Direct current loop resistance
- B.
Power sum
- C.
Length
- D.
Crosstalk
- E.
Noise
Correct Answer(s)
B. Power sum
D. Crosstalk -
- 36.
What is one of the most basic and widely used field test instruments available.
- A.
Time Domain Reflectometer (TDR)
- B.
Frequency Domain Reflectometer (FDR)
- C.
Digital Multimeter (DMM)
- D.
Wire Map Field Test Instruments (WMFTI)
Correct Answer
C. Digital Multimeter (DMM) -
- 37.
An Optical Time Domain Reflectometer (OTDR) requires access to _____ end(s) of the optical fiber, and sends pulses of light into an optical fiber and measures the strength of the power.
- A.
One end
- B.
Both ends
Correct Answer
A. One end -
- 38.
A visual fault locator operates in the visible light range.
- A.
True
- B.
False
Correct Answer
A. True -
- 39.
What is the visible light range.
- A.
200-500 nm
- B.
300-500 nm
- C.
400-700 nm
- D.
500-700 nm
Correct Answer
C. 400-700 nm -
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