Question 1

Which of the following refers to the increase in the nominal voltage for a duration of 3600 cycles?

Accepted Answer

Overvoltage refers to any increase in nominal voltage that lasts for longer than a cycle, but typically less than a minute. A swell refers to a voltage increase that lasts longer than a few minutes, a transient refers to a sudden brief spike in voltage, and a sag refers to a brief decrease in voltage. The specific timeframe of 3600 cycles (or one hour) aligns with the definition of overvoltage.

Question 2

The MINIMUM dimensions of the telecommunications main grounding busbar is ________ and variable in length.

Accepted Answer

According to industry standards, the minimum dimensions of the telecommunications main grounding busbar should be 6.3 mm (0.25 in) x 100 mm (4 in).

Question 3

Which of the following covers lightning protection systems and defines as exposed anything above ground and outside the zone of protection?

Accepted Answer

NFPA 780 covers lightning protection systems and defines as exposed anything above ground and outside the zone of protection.

Question 4

Electrical power cables are usually routed above aerial cable in order to:

Accepted Answer

The answer of Electrical power cables are usually routed above...

Question 5

Based on documentation contained within the Insulated Cable Engineers Association (ICEA) standard P32-382, Short Circuit Characteristics of Insulated Cable, a copper conductor is capable of safely carrying one ampere for ________ second(s) for every 42.25 circular mils.

Accepted Answer

According to the ICEA standard P32-382, a copper conductor can safely carry one ampere for five seconds for every 42.25 circular mils.

Question 6

Which of the following is NOT provided by the ac grounding electrode system?

Accepted Answer

The ac grounding electrode system does provide adequate electrical protection for people and equipment by providing a path for electrical current to flow in the event of a fault or surge.

Question 7

The impedance of the equipment grounding conductor can only be accurately measured with an instrument known as a(n):

Accepted Answer

The impedance of the equipment grounding conductor can only be accurately measured by using a specialized instrument such as the ground impedance tester. Volt ohm meters can measure resistance, but not impedance. Power distribution units, exothermic weld connections, and amp calculators are not suitable for measuring grounding conductor impedance.

Question 8

Often associated with raised flooring, a(n) ________ may consist of copper straps taped to the concrete floor, or it may be the floor itself with the stringers that support the tiles acting as the bonding conductor across the gradient of the floor.

Accepted Answer

The description provided in the question is referring to a signal reference grid (SRG), which is often used in conjunction with raised flooring in order to provide a low impedance path to ground for sensitive electronic equipment. The other options listed are not typically associated with this type of setup.

Question 9

Using Ohms law, a circuit of 120 volts and a resistance of 15 ohms will have a current of ________ amps.

Accepted Answer

The answer of Using Ohms law, a circuit of 120...

Question 10

The formula for calculating BTUs from electrical power is:

Accepted Answer

The formula for calculating BTUs from electrical power is W x 3.413. This is because one watt is equal to 3.413 BTUs per hour. Therefore, multiplying the power in watts by 3.413 gives the equivalent amount of heat in BTUs per hour.

Question 11

Phase difference is the relationship in time between two waveforms of the same:

Accepted Answer

Phase difference is the relationship in time between two waveforms of the same frequency.

Question 12

Certain systems must exist relative to bonding and grounding at every site. Which of the following is NOT one such system?

Accepted Answer

The lightning protection system is not primarily a bonding and grounding system for electrical safety or telecommunications, but rather a system to protect structures from lightning strikes.

Question 13

A rapid increase in voltage with a duration of half a cycle best describes a(n):

Accepted Answer

A rapid increase in voltage with a duration of half a cycle is a Transient, which refers to a temporary fluctuation in an electrical system's voltage, current, or frequency that can cause damage to equipment or affect its operation. Swells refer to a longer duration of high voltage, while overvoltage refers to a sustained voltage above the standard level. Frequency variation refers to a change in the frequency of the electrical system.

Question 14

If you have a circuit with 120 volts, 12 amps, and 10 ohms, it has a peak power of ________ watts.

Accepted Answer

The peak power can be calculated using the formula P = I^2R, where P is power in watts, I is current in amps, and R is resistance in ohms.

P = (12)^2(10) = 1440 watts

Therefore, the answer is choice C.

Question 15

You are designing a telecommunications grounding system for a telecommunications room (TR). The TMGB is located 15 m (50 ft) from the telecommunications rack. What is the MINIMUM AWG of the ground conductor required?

Accepted Answer

The answer of You are designing a telecommunications grounding system...

Question 16

The average power consumption in a telecommunications room (TR) is 2260 watts per hour. What is the heat dissipation in BTUs?

Accepted Answer

To convert watts to BTUs per hour, multiply by 3.412. So, 2260 watts * 3.412 = 7713.32 BTU/hr, which rounds to 7713 BTU.

Question 17

The recommended MAXIMUM value for the bonding resistance between the nearest available grounding electrode and the busbar in an entrance facility (EF) is ________ ohms.

Accepted Answer

The recommended maximum value for the bonding resistance between the nearest available grounding electrode and the busbar in an entrance facility (EF) is 0.1 ohms.

Question 18

As a guide, the MAXIMUM recommended DC current value on any bonded conductor should be less than:

Accepted Answer

The answer of As a guide, the MAXIMUM recommended DC...

Question 19

You have been asked what the estimated power cost will be per month (30 days) for the new equipment room you are designing. The power load you have calculated to be an average of 1850 watts per hour. What is the monthly cost assuming the cost of electricity is 7.5 cents (U.S.) per kilowatt hour?

Accepted Answer

Step 1: Convert the power load from watts to kilowatts by dividing by 1000:
1850 watts ÷ 1000 = 1.85 kW

Step 2: Calculate the total kilowatt hours (kWh) used in a month:
1.85 kW × 24 hours/day × 30 days/month = 1332 kWh/month

Step 3: Multiply the total kWh by the cost per kWh:
1332 kWh/month × $0.075/kWh = $99.90/month

Therefore, the estimated power cost per month is $99.90. Option C is the best choice.

Question 20

As a guide, the recommended maximum AC current value on any bonding conductor should be less than ________ amperes.

Accepted Answer

According to the National Electrical Code (NEC), the recommended maximum AC current value on any bonding conductor should be less than 1 amperes. Therefore, choice B is the best answer as it matches this recommendation.

Exam 1: BICSI Registered Communications Distribution Designer - RCDD