2.6.3 Practice Questions

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Electrical Engineering

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Jan 9, 2024

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Question 1: Correct You are an IT technician for your company. One of the employees has a computer that continually reboots when it's powered on. He has asked you to fix it. You suspect that the power supply may be failing. Which of the following is the BEST initial step to determine whether the power supply is causing the reboots? Correct Answer: Use a multimeter to test the power supply. Explanation A failing power supply can cause the computer to continuously reboot. For example, pin 8 on the power supply connector connects to the power wire on the motherboard. If power disappears from that wire, the motherboard shuts down. If power quickly reappears on that wire, the system may attempt to come back on by itself, which causes the symptom of continual reboots. Using a multimeter allows you to verify the amount of voltage supplied by the power supply. You could replace the power supply, but it is best to test the original power supply first, as other issues may be causing the reboots. A running fan is not a good indication of a properly functioning power supply since the fan may be running, but the power supply may not be supplying the correct voltage for other components to run properly. Some BIOSs may have a POST beep code that can give you a clue about a failing power supply, but this is not a reliable method for determining that the power supply is bad and needs to be replaced, and you may not have spare power supplies on hand to use. Question 2: Correct You are removing screws within a computer, but several have fallen into places you can't reach. Which tool would help retrieve the small screws? Correct Answer: Extension magnet Explanation An extension magnet is a small magnet on a collapsible rod that's used to retrieve screws that have fallen into a computer case or other areas you cannot reach. A punch down tool is used to secure cable wiring to a punch-down block or a patch panel, not to retrieve screws that have fallen into a computer case or other areas you cannot reach. Unless the lost parts are in an easily accessible location, a combination ratchet/screwdriver would be unlikely to help you retrieve the screws.
A network tap is used to collect data on traffic traveling across a network, not for retrieval of hardware parts. Question 3: Correct Which tool would be the BEST choice for securing cable wiring to a patch panel? Answer Extension magnet Combination ratchet/screwdriver Correct Answer: Punch down tool Network tap Explanation A punch down tool is used to secure cable wiring to a punch-down block or a patch panel, not to retrieve screws that have fallen into a computer case or other areas you cannot reach. An extension magnet is a small magnet on a collapsible rod that's used to retrieve screws that have fallen into a computer case or other areas you cannot reach. A combination ratchet/screwdriver is not designed to secure cable wiring to a patch panel. A network tap is used to collect data on traffic traveling across a network, not for retrieval of hardware parts. References 2.1.2 Safety Measures 2.1.5 ESD Facts 2.6.2 PC and Networking Tools Facts q_tool_fct_ic_extractor_pp7.question.fex Question 4: Incorrect You work in the computer repair department of a large retail outlet. A customer comes in with a workstation that randomly shuts down. You suspect that the power supply is failing. What should you do first to troubleshoot the issue? Answer Use a cable tester to check the power supply's connections.
Correct Answer: Use a known good spare to swap with the existing power supply. Incorrect answer: Use a power supply tester on the power supply. Use a multimeter to test the power supply's electrical properties. Explanation Known good spares are sets of components that you know are in proper functioning order. If you suspect a problem with a component, first try to swap it with a known good component. If the problem is not resolved, you can then continue troubleshooting other possible issues. A power supply tester is a custom multimeter used to test output from a PC power supply. The power supply tester has multiple connectors to test the output for each connector type. However, in this case, intermittent shutdowns are a common symptom of a failing power supply. While using a multimeter can test various electrical properties of the power supply, the first step should be to simply swap the current power supply with a known good spare to verify that the existing power supply is the cause of intermittent shutdowns. A cable tester verifies that a network can carry a signal from one end to the other and that all wires within the connector are in the correct positions. This tool is not used to test power supply connections. References 2.6.2 PC and Networking Tools Facts 3.4.1 Motherboard Troubleshooting 3.4.2 Motherboard Troubleshooting Facts 3.10.2 Processor Troubleshooting Facts 3.14.2 Power Supply Facts q_tool_fct_known_good_spare_pp7.question.fex Question 5: Correct A printer is behaving erratically; you suspect a faulty parallel port. Which tool can you use to test the parallel port? Answer Multimeter Ammeter Correct Answer: Loopback plug
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Cable tester Explanation A loopback plug allows an output signal to be returned as input. Loopback plugs are used to test serial and parallel ports. A cable tester verifies that a network can carry a signal from one end to the other and that all wires within the connector are in their correct positions. A multimeter measures electrical properties, such as voltage, amps, and resistance. An ammeter is an instrument that measures the flow of electric current in a circuit. References 2.6.1 PC and Networking Tools 2.6.2 PC and Networking Tools Facts q_tool_fct_loopback_plugs_test_pp7.question.fex Question 6: Correct You suspect that the power supply in your desktop PC is failing. You want to use a multimeter to test the power supply. Which multimeter setting should you use? Answer AC volts Ohms Watts Correct Answer: DC volts Explanation To measure a power supply's output, use DC voltage. A power supply converts AC voltage to DC voltage and supplies the DC power to computer components. An ohm is a measure of resistance used to check the properties of a resistor. AC is the voltage input for a power supply. To measure the input, measure the power from the wall socket. Multimeters can measure amps but do not measure watts. References 2.6.2 PC and Networking Tools Facts 3.4.1 Motherboard Troubleshooting 3.4.2 Motherboard Troubleshooting Facts
3.10.2 Processor Troubleshooting Facts 3.14.2 Power Supply Facts q_tool_fct_multimeter_setting_pp7.question.fex Question 7: Correct A technician is troubleshooting a computer that doesn't start up correctly. Which of the following could the technician use to troubleshoot the computer? Answer Correct Answer: Known good spares Tone generator and probe 3-prong parts retriever Loopback plug Explanation Known good spares are sets of components that you know are in proper functioning order, such as a power supply or an expansion card. In this scenario, swapping the current power supply with a known good part would be a good method for troubleshooting the computer. A 3-prong parts retriever is used to grasp and retrieve small parts that have fallen into areas that are difficult to reach. A tone generator and probe are used to trace a wire from one location to another, especially through the walls of a building. A loopback plug is used to test network communications by redirecting a signal from the transmit port on a device to the receive port on the same device. References 2.6.2 PC and Networking Tools Facts 3.4.1 Motherboard Troubleshooting 3.4.2 Motherboard Troubleshooting Facts 3.10.2 Processor Troubleshooting Facts 3.14.2 Power Supply Facts q_tool_fct_network_tools_trblshoot_pp7.question.fex Question 8: Correct A maintenance worker accidently nicks a bundle of network cables routed to multiple wall jacks in a conference room. Only one of the cable's wires are severed. A technician is tasked with replacing the cable.
Which of the following tools would the technician MOST likely use to identify which wall jack connects to the severed cable? Answer Multimeter Loopback plug Cable stripper Correct Answer: Tone generator and probe Explanation A tone generator and probe can be used to identify the wall jack connected to the severed wire. The tone generator can be attached to the severed wire, and the probe will sound when it is brought close to the connected wall jack. A multimeter measures voltage, current, and resistance on a wire. A loopback plug can be plugged into a network adapter to test whether the NIC can send and receive properly. A cable stripper is used to cut away the plastic jacket or coating from a network cable. References 2.6.1 PC and Networking Tools 2.6.2 PC and Networking Tools Facts q_tool_fct_network_tools_wall_jack_pp7.question.fex Question 9: Incorrect You need to trace the route that a Cat 6 UTP cable takes through the ceiling and walls of your building. Which tool should you use? Answer Incorrect answer: Cable tester Correct Answer: Tone generator Multimeter Loopback plug Explanation
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Use a tone generator to trace a UTP cable through walls and ceilings. A tone generator is attached to one end of the cable and the probe audibly traces the wire. A cable tester tests UTP cables for continuity and resistance. A multimeter is used to measure electrical voltage and resistance. A loopback plug is used to test network communications by redirecting a signal from the transmit port on a device to the receive port on the same device. References 2.6.1 PC and Networking Tools 2.6.2 PC and Networking Tools Facts q_tool_fct_tone_probe_pp7.question.fex Question 10: Incorrect Your workstation is unable to communicate with any other computer on the network. Which of the following tools should you use to test the network card's abilities to send and receive signals? Answer Incorrect answer: ping command Correct Answer: Loopback plug Multimeter Cable tester Explanation Use a loopback plug to test the network card's ability to send and receive signals. A cable tester tests the continuity of all the wires in a cable and ensures that wires are connected appropriately in the plugs. Pinging the local host (ping 127.0.0.1) tests the TCP/IP protocol stack but does not actually send signals out the network card. Use a multimeter and an ohmmeter to test the electrical properties of cables and signals.