PRACTICE TEST--CABLE TECHNICIAN EXAM 1 WITH VERIFIED ANSWERS

Which transmission modes are used to send data between secondary hubs and the headend? - correct answermicrowave, coax, and fiber After the RF signals are combined into one broadband signal and amplified to the proper level, what must happen to the signal before it can be transmitted over fiber-optic cable? - correct answerThe signal must be converted into light frequencies In a coaxial-only plant, which of the following is true? - correct answerBridger filters are used to block the signal from the feeder system In a hybrid fiber/coax system - correct answerThe trunk is fiber and the feeder and drop systems are coax The primary function of line extenders is to extend signals farther down the feeder line into the service area. As they do this, what do line extenders add to cable signal? - correct answerNoise and distortion Insertion loss - correct answerThe signal loss between the tap's input port and its output port Which of the following receives power from a power distributing tap? - correct answerNetwork interface unit (NIU) A broadband signal whose voltage varies continually over time is? - correct answerAn analog signal When a customer makes a phone call using a CBR network, which of the following is true? - correct answerthe call is carried to the PSTN by the cable system Reverse path signals go from the customer premises to the headend. How are reverse path signals sent to the headend - correct answerreverse path signals travel to the headend on sub-band RF carriers on the coaxial cable, which are converted into digital light signals to travel on the fiber-optic cable Which of the following represents 1,000,000,000 cycles per second - correct answerOne gigahertz The RF spectrum is made up of several bands of frequencies. What is the name of the band located between 216 MHz and 300 MHz? - correct answerSuper-band What happens when a carrier is modulated? - correct answerthe baseband signal changes the carrier signal so it can carry information What is the process of recovering the information from a modulated carrier called? - correct answerDemodulation What is "a measurement of the force or pressure that causes electrons to move"? - correct answerVoltage What is the difference between two carriers, one measure at +3 dBmV and one measured at -8 dBmV? - correct answer11 dB What unit of measure is used to express the difference between two carrier measurements? - correct answerDecibel (dB) According to the Federal Communications Commission (FCC) , what is the minimum signal level for an analog video carrier? - correct answer0 decibel-millivolts (dBmV) Why is it important that the carriers be maintained at proper levels - correct answerto maintain proper carrier-to-noise ratios (C/N) and to limit distortion Which of the following is caused by egress? - correct answerInterference with aeronautical freqencies