Test Level 2
A 1 dB increase in signal level is equal to a _____ power increase?
25.89%
There are three essential requirements for current to flow in a circuit: power source, load, and what?
Connecting conductors
Which of the following best describes current?
Excessive flow for a specific conductor size can cause the conductor to become too hot and melt or burn the conductor's insulating cover.
Which technique can be useful in helping others understand your emotional state and in providing them with direction around how to help you restore balance?
Feel, Felt, Found technique
You are at a customer's home, and you are asking the customer whether the problem is intermittent or constant. Which steps are you using from the six-step troubleshooting process?
Identify the problem
When dBs are added to dBmVs, the voltage is _________ by the corresponding dB ratio?
Multiplied
What best describes fusion splices when repairing and splicing fiber-optic cable?
Permanent fix
Which of the following best describes one-tenth bel or 1 dB?
The 10th root of the 1 bel ratio.
hich of the following best describes the relationship between an mpere and a coulomb?
The number of amperes is equivalent to the number of coulombs passing a given point during one second.
What happens between two closely spaced parallel wires that are conducting current?
The two wires interact with each other in the same way field of permanent magnets interact.
Why do values expressed in dBmV progress nonlinearly compared to a linear mV?
They are based on the logarithms of power ratios.
is the rate at which work is done
power
Which term best describes the opposition a material or device offers to the current flow?
resistance
Which condition produces insufficient current flow?
© A large load or an inadequate power source.
Which formula is used to calculate the typical attenuation of a certain length of coaxial drop cable?
(Cable length in feet/100) x Cable attenuation in decibels (per 100 feet) at frequency (f).
What are 20 mA equivalent to?
0.02 amperes.
Analog signals less than and including 54 MHz, and over 216 MHz has a signal leakage limit of uV/m at 30 meters?
20
What determines the strength of an electromagnetic field?
An electromagnetic field is determined by the magnitude of the mmf.
Which category of RJ45 wire is best suited for data centers with runs of 30 meters or less?
Cat-8
When a signal going through a drop amplifier is not being amplified, what is the first step to take if the drop amplifier indicator light is not on?
Make sure the amplifier is not plugged into a switched power outlet that might be off.
Across which resistor is the greatest voltage drop in a DC series circuit where R = 25 ohms, R2 = 50 ohms, R3 = 75 ohms, and R4 = 10 ohms?
R3
Which of the following metals has the greatest conductance?
Silver
You are at a customer's home, and you believe you have solved the problem. When you check to ensure the resolution did not introduce any new problems, which step are you using from the six-step troubleshooting process?
Verify the solution
Which is the best amplifier to use when the digital STB, cable modem, or EMTA cannot consistently and reliably transmit information back to the headend because of a long cable drop run?
© A return path (reverse or upstream) amplifier.
How many ohms of resistance is required for a circuit with an applied voltage of 30 volts and a circuit current of 1.3 amperes?
• 23.077
How do you convert a fraction to a percent?
• Dividing the numerator by the denominator and multiplying by 100.
Seven and 3/8s divided by 7 and 1/4
1 and 1/58
Tight buffered fiber-optic cable is used for what purpose?
It is used for cross-connects in the headend or hub or building-to-building campus-type applications in the broadband industry.