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Stack #279898
TS132 Final - Chapter 3 Study Guide
| Question | Answer |
|---|---|
| Volts are a measure of what characteristic of electricity? | The potential difference in a circuit |
| What is the normal voltage of house electricity in the U.S.? | 110 volts to 120 volts |
| Hot wires in home wiring are normally colored ____ and ground wires in computers are normally colored _____. | black |
| What is the difference between a transformer and a rectifier? Which are found in a PC power supply? | A rectifier is a device that converts alternating current to direct current. A transformer is a device that changes the ratio of current to voltage. A computer power supply functions as both. |
| What are the five voltages produced by an ATX or BTX power supply? | +5, -5, +12, -12, and +3.3 |
| What is the purpose of the 4-pin auxiliary connector on a motherboard? | To provide extra voltage for a processor |
| How many pins does the main power connector on a BTX board have? | 24 pins |
| When taking a computer apart, why is it important to not stack boards on top of each other? | You could accidentally dislodge a chip. |
| Describe the purpose of the ground line in a house circuit. What is the electrical symbol for ground? | The ground line keeps the uncontrolled flow of electricity from continuing indefinitely. The symbol for ground is a vertical line with three horizontal lines underneath it. |
| What is the basic electronic building block of an integrated circuit? | The transistor |
| Why is a power supply dangerous even after the power is disconnected? | Capacitors inside a PC power supply create the even flow of current needed by the PC. Capacitors maintain their charge long after current is no longer present, which is why the inside of a power supply can be dangerous even when power is disconnected. |
| What is the symbol for a diode? | The symbol for a diode is a vertical and horizontal line with an arrow head at the point of intersection of the two lines. |
| What is a simple way to detect EMI? | On an inexpensive AM radio, turn the tuning dial away from a station into a low-frequency range. With the radio on, you can hear the static produced by EMI. Try putting the radio next to several electronic devices to detect the EMI they emit. |
| What is an unintended, high-current, closed connection between two points in a circuit called? | A short or short circuit |
| Which form factor uses a riser card on the edge of the motherboard? | NLX |
| List four types of computer case form factors. What is the most popular type of form factor for PCs today? | Possible answers: AT, ATX, BTX, LPX, NLX, and backplane form factors. The most popular is ATX. |
| List three advantages an ATX system has over a Baby AT system. | It makes it easier to add and remove components, provides greater support for I/O devices, and lowers costs. |
| List four computer symptoms that indicate a faulty power supply. | •The PC sometimes halts during booting. After several tries, it boots successfully. •Error codes or beep codes occur during booting, but the errors come and go. •The computer stops or hangs for no reason. Sometimes it might even reboot itself. |
| According to ACPI standards, the S1 mode causes what two devices to stop using power? | Hard drive and monitor |
| What is another name for the ACPI standard S4 mode? | Hibernation |
| What power management standard is older than ACPI and has mostly been replaced by ACPI? | APM |
| How can you easily tell if a computer is designed to comply with Green Standards? | See whether it displays the green Energy Star logo onscreen when the PC is booting. |
| What unit of measure is used to describe the amount of work a surge suppressor can do before it stops protecting the circuit from an electrical surge? | Joule |
| Why is it important to have an indicate light on a surge suppressor? | It is important so you can tell when the surge suppressor is no longer providing protection against a power surge. |
| What are the two main types of uninterruptible power supplies? | Standby and inline |
| How does a smart UPS differ from one that is not smart? | A smart UPS can be controlled by software from a computer to allow additional functionality. |
| If you are asked to identify the form factor of a motherboard, what are two criteria you can use to help you identify the board? | Look for how the expansion slots are oriented in reference to the CPU and look for the type of power connector the board is using. |
| What are three motherboard form factors that can be used with a compact case? | NLX, LPX, or mini-LPX |
| What is one thing you can regularly do to prevent a computer system from overheating? | Remove the dust from the inside of the case. |
| Which type of case form factor is best designed to keep a system cool? | BTX |
| How much power is consumed by a load drawing 5 A with 120 V across it? | 600 watts |
| You suspect that a power supply is faulty, but you use a multimeter to measure its voltage output and find it to be acceptable. Why is it still possible that the power supply may be faulty? | It is still possible because problems with power supplies are intermittent (they can come and go). |
| Someone asks you for help with a computer that hangs at odd times. You turn it on and work for about 15 minutes, and then the computer freezes and powers down. What do you do first? | •Replace the surge protector. •Replace the power supply. •Turn the PC back on, go into CMOS setup, and check the temperature reading. •Install an additional fan. =Turn the PC back on, go into CMOS setup, and check the temperature reading. |
| When working on a computer, which of the following best protects against ESD? Why? | •Always touch the computer case before touching a circuit board inside the case. •Always wear an antistatic bracelet clipped to the side of the case. •Always sit a computer on an antistatic mat when working on it. =Always wear an antistatic bracelet |
Created by:
venum209