Free Registered Communications Distribution Designer (RCDD): Network Design Principles and Practice Questions and Answers

Question 1

If a communication system receives an input signal power of 1 watt and produces an output power of 1 milliwatt, what is the measure of system attenuation?

Accepted Answer

30 dB

Answer

Attenuation in decibels (dB) is calculated using the formula: dB = 10 * log10(Pout / Pin). Given an input power (Pin) of 1 watt and an output power (Pout) of 1 milliwatt (0.001 watt), the calculation is 10 * log10(0.001 W / 1 W) = 10 * log10(0.001). Since log10(0.001) is -3, the attenuation is 10 * (-3) = -30 dB. As attenuation represents a loss, it is expressed as a positive value of 30 dB.

Question 2

In a scenario where a video camera provides a video signal through a coaxial cable output and the intention is to transmit the signal to devices equipped with balanced twisted pair inputs, how can the conversion between these dissimilar transmission media be effectively achieved?

Accepted Answer

Balun

Answer

A balun (balanced-unbalanced) is a device specifically designed to convert electrical signals between a balanced line, such as a twisted pair cable, and an unbalanced line, like a coaxial cable. This conversion is essential for maintaining signal integrity and preventing noise when interfacing devices that use different transmission media, ensuring proper signal transmission from the camera to the receiving devices.

Question 3

In a situation where CAT6 cable installation is required above a factory floor housing automated welding machines and hammer forges, which among the following choices for shielding would offer the highest degree of effectiveness?

Accepted Answer

Solid metallic conduit

Answer

In an industrial environment with automated welding machines and hammer forges, significant electromagnetic interference (EMI) and radio frequency interference (RFI) are present. Solid metallic conduit provides the most robust and continuous shielding against these harsh noise sources. It acts as a Faraday cage, effectively containing and diverting external electromagnetic fields away from the sensitive CAT6 cables, thereby ensuring signal integrity.

Question 4

When considering slip sleeves or gutters, which of the following statements accurately reflects their characteristics or attributes?

Accepted Answer

Provides more space for pulling

Answer

Slip sleeves or gutters are components used in conduit systems, particularly at bends or where multiple conduits converge, to create a larger, smoother opening. This increased space significantly reduces friction and the likelihood of cable damage during pulling operations. Their primary function is to facilitate easier and safer installation of large bundles of cables or cables with delicate insulation.

Question 5

An illustration of which kind of system is found in the public telephone system?

Accepted Answer

Full-duplex

Answer

The public telephone system operates as a full-duplex communication system, meaning both parties can transmit and receive signals simultaneously. This capability allows for natural, real-time, two-way conversations without the need to take turns speaking. Unlike half-duplex systems, full-duplex enables continuous bidirectional communication.

RCDD - Registered Communications Distribution Designer Practice Test

RCDD - Registered Communications Distribution Designer Practice Test

Free Registered Communications Distribution Designer (RCDD): Network Design Principles and Practice Questions and Answers