Question 1

A common mode (CM) signal can be converted to a differential mode (DM) signal as a result of a(n):

Accepted Answer

A common mode signal can be converted to a differential mode signal due to an unbalanced circuit. An unbalanced circuit refers to any circuit that has different signal paths for its line and neutral conductors, which can result in different impedance for each conductor leading to a common mode signal.

Question 2

You must extend a video systems backbone coax cable that was recently installed. Which of the following coaxial cable types would provide the best performance for both analog and digital video?

Accepted Answer

Series 11 coaxial cable is designed for high-performance video applications and provides excellent signal quality for both analog and digital video signals.

Question 3

Which of the following is NOT a design consideration for broadband video distribution?

Accepted Answer

The 90 meter (295 feet) rule for horizontal distribution is a design consideration for Ethernet cabling, not for broadband video distribution. Amplifier link budgets, amplifier cascade limitations, environmental factors, and drop length are all important considerations for efficient and effective broadband video distribution.

Question 4

Which of the following is NOT a source of electromagnetic interference (EMI)?

Accepted Answer

All other options, including copiers, transformers, fluorescent lights, and electrical power supply cables, can generate electromagnetic interference, which can disrupt the proper functioning of electronic devices. However, incandescent lights do not produce significant EMI, making them the exception in this list.

Question 5

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)?

Accepted Answer

Providing a minimum separation of 1194 mm (47 in) is a standard practice to reduce the effects of EMI on unshielded twisted-pair cables.

Question 6

The electromagnetic spectrum of visible light lies in the ___________ frequency range of the spectrum.

Accepted Answer

Visible light falls within the frequency range of approximately 400 THz to 800 THz, which is equivalent to 0.4 PHz to 0.8 PHz. Therefore, 1 PHz is within the range of visible light frequencies.

Question 7

What is the recommended MINIMUM separation of unshielded twisted-pair (UTP) cables from fluorescent light fixtures?

Accepted Answer

The answer of What is the recommended MINIMUM separation of...

Question 8

The ability of a device to withstand electromagnetic disturbances from another device is:

Accepted Answer

EMC (Electromagnetic Compatibility) is the ability of a device to work without any interference from other devices and to not cause any electromagnetic disturbances to other devices. It encompasses both EMI and RFI, as well as Fast Transients and ESD.

Question 9

What is the International Organization for Standardization/International Electrotechnical Commission ISO/IEC class rating for American National Standards Institute/Telecommunication Industry Association (ANSI/TIA) Category 5e cable?

Accepted Answer

Category 5e cable is rated as Class D according to the ISO/IEC standards, which supports data transmission up to 100 MHz.

Question 10

What is the frequency rating of an International Organization for Standardization/International Electrotechnical Commission (ISO/IEC) Category 7/Class F cable?

Accepted Answer

ISO/IEC Category 7/Class F cable has a frequency rating of 600 MHz.

Question 11

During a site survey you notice that several CRT displays in the vicinity of the engineering copy center have sporadic visual distortion. What is the MOST likely cause?

Accepted Answer

CRT displays are susceptible to electromagnetic interference (EMI) from other equipment in the vicinity, especially if the equipment emits strong magnetic fields. This can cause visual distortion on the screens. Radio frequency interference (RFI) and electromagnetic compatibility (EMC) can also cause similar issues, but given the location near the copy center, EMI is the most likely cause. Fast transients and electromagnetic discharge (ESD) are less likely to cause visual distortion on CRT displays.

Question 12

What is the connector of choice for Series 59, Series 6, and Series 11 applications?

Accepted Answer

The F-Style connector is commonly used for Series 59, Series 6, and Series 11 coaxial cable applications, typically in cable television and satellite television installations.

Question 13

Which of the following is an undesirable electromagnetic effect on a device(s)?

Accepted Answer

The answer of Which of the following is an undesirable...

Question 14

You are required by architectural design to place UTP cables in the same space as unshielded power lines. How should you proceed with the placement of your cables?

Accepted Answer

UTP cables should be separated from unshielded power lines by a minimum of 610 mm (24 inches) to prevent electromagnetic interference.

Question 15

The potential for ______ occurs when devices or systems share a common electromagnetic environment and their operational frequencies overlap.

Accepted Answer

The potential for electromagnetic interference (EMI) occurs when devices or systems share a common electromagnetic environment and their operational frequencies overlap. This can lead to disrupted or degraded performance in the affected devices, and is a major concern in the design and operation of electronic systems.

Question 16

What is the insertion loss guideline for a multimode mechanical splice?

Accepted Answer

The insertion loss guideline for a multimode mechanical splice is typically 0.3 dB or less. Choices A, B, D, and E all exceed this guideline. Therefore, C (0.3 dB) is the best choice.

Question 17

What type of optical fiber is used primarily for outside plant (OSP) applications?

Accepted Answer

Loose-tube fibers are preferred for outside plant (OSP) applications because they offer better protection against moisture, temperature, and physical stress.

Question 18

What is the testing frequency of a Category 6/Class E cable?

Accepted Answer

Category 6/Class E cables are designed to operate at a frequency of up to 250 MHz. Therefore, the testing frequency of a Category 6/Class E cable should also be 250 MHz to ensure proper functionality and performance. Choices A, B, D, and E all exceed the recommended testing frequency and are not appropriate for a Category 6/Class E cable.

Question 19

There are three buildings approximately 400 meters apart and the customer wants to use 10 Gig Ethernet. What fiber should be specified for this application?

Accepted Answer

10 Gig Ethernet requires singlemode fiber.

Question 20

You have discovered a common mode current on the metallic cable sheaths of your building riser cables. What is the MOST likely cause for you to investigate?

Accepted Answer

Common mode currents are created when two or more ground references are not at the same potential. Therefore, the most likely cause to investigate is two separate and distinct ground references.

Exam 1: BICSI Registered Communications Distribution Designer - RCDD

A common mode (CM) signal can be converted to a differential mode (DM) signal as a result of a(n) :