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63 Cards in this Set
- Front
- Back
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What is Voltage and what is it measured by? What are some Common voltages that are found? |
A Representation of potential energy. Sometimes it's more simply referred to as pressure; its unit of measurement is volts (V). 120 Volts AC - the voltage associated with many US homes 5 Volts DC - The voltage associated with some of the internal power connections in your PC |
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What is Wattage or Electric Power and what is it measured by? |
The rate of electric energy in a circuit, measured in watts (W) |
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What is Amperage or Electric Current and what is it measured by? |
The movement of electric charge, measured in amperes or amps (A) |
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What is Impedance and what is it measured by? |
The amount of resistance to electricity, measured in ohms (Ω) |
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What are AC and DC current? |
AC - Alternating Current - The flow of electrons alternate (used by the houses outlets) DC - Direct Current - The flow of electrons is one way (your computer) |
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How can you keep AC outlet's voltage steady? |
Use a UPS or line conditioner. |
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Which tool is used to test the amount of voltage that comes from an AC outlets? A) Multimeter B) Voltage detector C) Receptacle tester D) Impedance tester |
A) multimeter |
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Which of the following is a representation of potential energy? A) Wattage B) Voltage C) Impedance D) Amperage |
B) Voltage Voltage is the representation of potential energy; an analogy for voltage would be water pressure in a pipe |
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Which wire, when tested, should display zero volts on a multimeter? A) Black B) Hot C) Ground D) Red |
C) Ground |
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What is a power surge? |
Unexpected increase in the amount of voltage provided. This can be a small or a larger increase known as a spike |
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What is a power spike? |
it is a short transient in voltage that can be due to a short circuit, tripped circuit breaker, power outage, or lighting strike |
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What is a power sag? |
it is a unexpected decrease in the amount of voltage provided. Typically sags are limited in time and in the decrease in voltage. however, when voltage reduces further a brownout could ensue |
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What is a brownout? |
the voltage drops to such an extent that it typically causes the lights to dim and causes computers to shut off |
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What is a blackout? |
It is when a total loss of power for a prolonged period occurs. Another problem associated with blackouts is the spike that can occur when power is restored. |
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How can you protect against a surges and spikes? |
Use a surge protector or surge suppressor |
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What are surge protectors rated in? |
Joules. they are a way to measure energy. Essentially, the more joules, the better. usually 1,000 joules or more are recommended |
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What can you use to help protect your computer from a blackout? |
Use a UPS (uninterruptible power supply) or a battery backup. |
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What is something you do not want to connect to a UPS? |
A laser printer due to high current draw. |
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What device should be used to protect against a power outage? |
UPS (uninterruptible power supply) |
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You want a cost effective solution to the common surges that can affect your computer. Which device offers the best solution? A) UPS B) Surge suppressor C) Power strip D) Lin Conditioner |
B) Surge suppressor (AKA surge protector) |
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Which of the following is an unexpected increase in voltage? A) Sag B) Blackout C) Spike D) Whitout |
C) spike |
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You are fixing a computer for a customer when you notice a few of the fluorescent lights flickering every now and then. which of the following should be recommended to the customer to protect his equipment? A) To get an electrician B) To install a UPS C) To get an extra power supply D) to buy a generator |
B) To install a UPS |
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what do the original ATX power supplies use to connect to the motherboard VS the new ATX 12v 2.x power supplies? |
original ATX power supplies - 20 pin connector new ATX 12v 2.x power supplies - 24 pin connector |
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What is the propose of a "Dual-rail" PSU? |
the propose is to separate and limit the current through each wire to avoid overheating |
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What are the features of a desktop case? |
lies Horizontally; usually has one of two 5 1/4 inch drive bays |
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What are the features of a mini-tower case? |
stand vertically; usually has two or three drive bays |
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What are the features of a mid-tower case? |
usually has three or four bays |
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What are the features of a full tower case? |
usually has 6 bays |
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What are the features of a slim line case? |
usually stands vertically; small form factor. eg used with mini-ITX systems and microATX |
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What are the features of a all-in-one (AOC) case? |
the computer case and components are integrated into the monitor. This could be a monitor that is meant to sit on a desktop or a handheld device with touch screen. |
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What is the use case for the Molex connector? What are the pins and voltages associated with this connector? |
Case fans, IDE HD's, optical drives. Red (5 V), black (G), black (G), yellow (12 v). |
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What is the use case for the SATA connector? What are the pins and voltages associated with this connector? |
Serial ATA HD's & optical drives 15-pin, 3.3 V, 5 V, & 12 V. |
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What is the use case for the PCIe connector? What are the pins and voltages associated with this connector? |
PCI Express video cards 6-pin, 12 V (ATX 12V version 2.1) 8-pin, 12 V (ATX 12V Version 2.2 and higher) |
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What does IEC stand for? |
International Electrotechnical commission. |
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What is the power cable inlet known as? what are the inlets and cables that connect to them known as? |
C14 inlet is the power cable inlet IEC 60320 (previously IEC 320 spec) |
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If a power supply has failed what should you do? |
Replace it. Never open it and try to repair it. |
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Which device tests multiple wires of a power supply at the same time? A) multimeter B) Power supply tester C) Line Conditioner D) surge protector |
B) Power supply tester |
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Which power connector should be used to power an SATA HD? A) Molex B) 6-pin C) 24-pin D) 15-pin |
D) 15-pin |
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Which voltages are supplied by the Molex power connector? A) 12 V & 5V B) 5 V & 3.3 V C) 3.3 V & 1.5 V D) 24 V & 12 V |
A) 12 V & 5V |
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A company salesperson just returned to the US after 3 months in Europe. Now the salesperson tells you that her PC, which worked fine in Europe won't turn on. What is the best solution? A) install a new power supply B) the computer will not work in the US due to European licensing C) Install a power inverter to the power supply D) Change the voltage from 230 to 115 |
D) Change the voltage from 230 to 115 |
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You are troubleshooting a computer that won't power on. You have already check the AC outlet and the power cord, which appear to be functioning properly, what should you do next? A) Test the computer with A PSU tester B) Plug the computer into a different outlet C) check that the RAM is seated correctly D) Install a UPS |
A) Test the computer with A PSU tester |
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You suspect that incorrect voltage is provided to a power supply. what tool should you use to test this? A) PSU tester B) loopback adapter C) Multimeter D) Voltage Detector |
C) Multimeter |
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You just upgraded a motherboard in a computer and put the system back together. it boots, but the power LED on the front of the computer case doesn't light when the system is on. the rest of the computer seems to work fine. what should you do first? A) Check the power supply B) Check the power LED pinout C) Replace the LED D) replace the power button |
B) Check the power LED pinout |
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A computer you are troubleshooting shuts down w/o warning. after a few minutes, it boots back up fine, but after running for a short time, it shuts down again. which of the following components could be the cause? (Select two best answers) A) Power supply B) SATA HD C) CPU Fan E) Video Card |
A) Power supply C) CPU Fan |
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What does PSU and FRU stand for? |
Power Supply Unit Field Replaceable Unit |
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Power supplies come in many sizes, what is the standard size? |
150mm x 140mm x 86mm |
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What are Mini-ATX & micro-ATX power supplies used for? |
Smaller power supply form factors designed specifically for mini-ATX & micro-ATX cases, respectively |
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What are TFX12V power supply used for? |
A small power supply form factor optimized for low-profile ATX systems |
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What are SFX12V power supply used for? |
A small power supply form factor optimized for systems using FlexATX motherboards |
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What are CFX12V power supply used for? |
An L-shaped power supply optimized for microBTX systems |
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What are LFX12V power supply used for? |
A small power supply form factor optimized for lower profile BTX systems |
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What does Harmonics refer to when dealing with electrical power? |
Harmonics are created by electronic equipment with nonlinear loads drawing in current in abrupt short pulses. The short pulses cause distorted current waveforms, which in turn cause harmonic currents to flow back into other parts of the power system. |
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What is active PFC? |
Good power supplies come with active power factor correction that offers extra circuitry that smooths out power coming from the wall before passing it to the main power supply circuits. this process eliminates any harmonics. |
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Power supplies are typically graded for their efficiency under a voluntary standards program called _____ ______ |
80 Plus Power supplies under 80 plus are rated from 80% to 85%, Gold (90%), or Titanium (94%) |
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What isthe proper voltage for a U.S. electrical outlet? A. 120 V B. 60 V C. 0 V D. –120 V |
A. 120 V |
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Whatvoltages does an ATX12V P1 connector provide for the motherboard? A. 3.3 V, 5 V B. 3.3 V, 12 V C. 5 V, 12 V D. 3.3 V, 5 V, 12 V |
D. 3.3 V, 5 V, 12 V |
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1. What sortof power connector did a floppy disk drive typically use? A. Molex B. Mini C. Sub-mini D. Micro |
B. Mini |
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1. Joachimordered a new power supply but was surprised when it arrived because it had anextra 4-wire connector. What is that connector? A. P2 connectorfor plugging in auxiliary components B. P3connector for plugging in case fans C. P4connector for plugging into modern motherboards D. Auxconnector for plugging into a secondary power supply |
C. P4 connector for plugging into modern motherboards |
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Whatshould you keep in mind when testing DC connectors? A. DC has polarity. The red lead should alwaystouch the hot wire; the black lead should touch a ground wire. B. DC has polarity. The red lead should alwaystouch the ground wire; the black lead should always touch the hot wire. C. DC has no polarity, so you can touch the redlead to either hot or ground. D. DC has no polarity, so you can touch theblack lead to either hot or neutral but not ground. |
A. DC has polarity. The red lead should always touch the hot wire; the black lead should touch a ground wire. |
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Whatvoltages should the two hot wires on a Molex connector read? A. Red = 3.3 V; Yellow = 5 V B. Red = 5 V; Yellow = 12 V C. Red = 12 V; Yellow = 5 V D. Red = 5 V; Yellow = 3.3 V |
B. Red = 5 V; Yellow = 12 V |
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6.Why is ita good idea to ensure that the slot covers on your computer case are allcovered? A. To maintain good airflow insideyour case. B. To help keep dust and smoke outof your case. C. Both A and B are correct reasons. D. Trick question! Leaving a slot uncovered doesn’thurt anything. |
C. Both A and B are correct reasons. |
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A PC’spower supply provides DC power in what standard configuration? A. Two primary voltage rails, 12 volts and 5volts, and an auxiliary 3.3-volt connector B. Three primary voltage rails, one each for12-volt, 5-volt, and 3.3-volt connectors C. One primary DC voltage rail for 12-volt,5-volt, and 3.3-volt connectors D. One voltage rail with a 12-volt connector forthe motherboard, a second voltage rail with a 12-volt connector for the CPU,and a third voltage rail for the 5-volt and 3.3-volt connectors |
B. Three primary voltage rails, one each for 12-volt, 5-volt, and 3.3-volt connectors |
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Whatfeature of ATX systems prevents a user from turning off a system before theoperating system has been shut down? A. Motherboardpower connector B. CMOS setup C. Sleepmode D. Soft power |
D. Soft power |
