CompTIA A+ Practice Tests. Docter Quentin
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D. The power supply fan is used to cool the power supply. In addition, this fan draws air from inside the case into vents in the power supply. This pulls hot air through the power supply so that it can be blown out of the case.
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A. A solid-state drive (SSD) is the best choice for a hard drive, when access speed is the most important characteristic. A conventional magnetic hard disk drive (HDD) is slower. Secure Digital (SD) is a memory card format, not a hard drive type. BD-R is a Blu-ray Disc format.
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B. The Northbridge is responsible for managing high-speed peripheral communications. The Southbridge manages slower onboard peripherals such as PS/2, parallel, serial, and Serial ATA and Parallel ATA.
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B. USB 1.0 supports 12Mbps, USB 2.0 supports 480Mbps, and USB 3.0 supports 5Gbps.
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B. RAID 5 arrays require a minimum of three hard drives. Since the computer already has one, he therefore needs two more.
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C. Any device that measures one or more physical or behavioral features of an organism is considered a biometric device. Biometric devices include fingerprint scanners, retinal and iris scanners, voice recognition devices, facial recognition devices, and others.
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A. A processor that exhibits a multicore architecture has multiple completely separate processor dies in the same package. The operating system and applications see multiple processors in the same way that they see multiple processors in separate sockets.
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B. All are digital video disc (DVD) technologies. A single-sided, single-layer (SS, SL) DVD provides about 4.7GB of storage. A dual-sided (DS) disc will double that capacity to 9.4GB. Adding a second layer, or dual-layer (DL), adds more capacity, but the technology does not double the capacity of a single layer. A single-sided, dual-layer (SS, DL) disc has capacity of about 8.5GB.
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D. Many power supplies have a two-position slider switch called a dual voltage switch. It can be set for 110–120V or 220–240V, depending on what local power specifications are.
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D. MicroATX motherboards are a 9.6″ square, and mini-ITX motherboards are a 6.7″ square. Pico-ITX motherboards are 3.9″ × 2.8″, and mobile-ITX motherboards are 2.4″ square.
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B, C. Daisy-wheel and dot-matrix printers use print heads that strike an ink ribbon, which presses up against the paper to make an image. Therefore, they are impact printers. Laser printers use a drum to create the image, and thermal printers use heat.
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B. OLEDs create the image in an OLED display and supply the light source, so there is no need for a backlight with its additional power and space requirements, unlike in the case of LCD or plasma panels.
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A. Although serial might sound slower than parallel, modern technology has made the serial bus much faster than parallel bus systems.
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D. Only the most recently used data and code or that which is expected to be used next is stored in cache. Cache is much smaller and faster than RAM.
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A, B. Sockets that support Intel processors are currently named starting with the letters LGA, such as LGA1156 and LGA2011. Socket names that start with AM or FM will support AMD processors and not Intel processors.
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B. A standard hard disk drive (HDD) will provide her with the highest capacity of the four options and also give her immediate access. A solid-state drive (SSD) is fast but does not have as much capacity. Secure Digital (SD) is a memory card format and does not offer the capacity or immediacy she needs. BD-R is a Blu-ray Disc format. It has good storage capabilities, but not the immediacy for editing.
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A, C. A home theater PC (HTPC) needs to maximize the audio and video experience. It won’t do a lot of processing or data management, so an upgraded processor or RAM is unneeded. Install a great sound card, a video card with multiple HDMI outputs, and a TV tuner card. (HDMI is capable of supporting 7.1 surround sound, so you may choose to buy one expansion card capable of handling both functions.) Some HTPCs come in a compact form factor, which is just a small case.
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B, C. Digital monitors will have a digital interface, such as DVI-D, HDMI, or miniHDMI. Composite connectors are rarely used on monitors, and VGA is analog, not digital.
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D. There is no need for laptops with LED displays to convert the DC power coming into the laptop to the AC needed to power traditional fluorescent backlights because LEDs operate on DC power just like the rest of the laptop. Therefore, systems with LED backlights have no inverter board.
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A, B, D. The four virtual printing options are print to file, print to PDF, print to XPS, and print to image.
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B. There are four major versions of PCIe currently specified: 1.x, 2.x, 3.0, and 4.0. For the four versions, a single omnidirectional lane operates at a data rate of 250MBps, 500MBps, approximately 1GBps, and roughly 2GBps, respectively. A bidirectional slot doubles the data rate.
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D. Laser printers incorporate a fuser assembly, which uses two rollers that apply pressure and heat to fuse the plastic toner particles to the paper.
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A. During the charging step, the charging corona uses a high voltage to apply a strong, uniform negative charge (around –600VDC) to the surface of the imaging drum.
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A. When installing dual-channel RAM, be sure that the RAM modules both have the same parameters. In some cases, you might even need to make sure they come from the same manufacturer.
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D. Carriage motors are components in inkjet printers. Laser printer components include a fuser assembly, imaging drum, transfer belt, transfer roller, pickup roller, separator pads, and a duplexing assembly.
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A. Laser printer uses various high-voltage biases inside the case, and high voltages can create ozone.
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D. The purpose of a KVM switch is to allow you to have multiple systems attached to the same keyboard, monitor, and mouse. You can use these three devices with only one system at a time, and the device will have a dial or buttons to allow you to switch between systems.
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B. It sounds like this printer needs to manage its own print jobs; therefore, it probably needs to be its own print server. Installing an integrated print server with a network connection will probably do the trick.
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B. Clean pickup rollers (and other rubber rollers) with mild soap and water and not alcohol. Alcohol can dry out the rollers, making them brittle and ineffective. A dry cloth will not remove the dirt or debris, and compressed air would just blow the debris into other internal printer components.
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D. During the developing step, toner is attracted to areas of the drum where an image has been written by the laser. Those areas have a slight negative charge (–100VDC) as opposed to unexposed areas of the drum and the developing roller (which the toner is stuck to), which each have a charge of –600VDC.
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C. The primary factor in determining data throughput for a magnetic hard drive is the spin rate. Higher spin rates will result in faster data reads and writes and increase data throughput.
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B. LoJack, made by Absolute Software, allows you to remotely lock a computer if it has been stolen or compromised. It will also allow security teams to locate stolen laptops.
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D. The white connector is a 20-pin ATX power connector. You will also see 24-pin versions, which have two rows of 12 pins each.
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B. Motherboards support memory based on the speed of the frontside bus (or the CPU’s QPI) and the memory’s form factor. For example, if the motherboard’s FSB is rated at a maximum speed of 1333MHz, you should install memory that is rated at 1333MHz.
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C. To make information