Description : hard disks should be stored in an environment that stays within what relative humidity and temperature range?
Last Answer : electronics onto the disk. 30-60 percent relative humidity. b. 70-80 degrees Fahrenheit.
Description : For AM transmissions, the carrier is normally modulated within what range?
Last Answer : 60% to 95%.
Description : If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle (a) more (b) less (c) equal (d) depends on other factors (e) none of the above.
Last Answer : Answer : c
Description : Tabular bowl centrifuges as compared to disk bowl centrifuges (A) Operate at higher speed (B) Employ bowl of larger diameter (C) Can’t be operated under pressure/vacuum (D) Can’t be used for separation of fine suspended solids from a liquid
Last Answer : (A) Operate at higher speed
Description : If the fuse shown on the schematic (figure 3-10) opens, what lights will operate?
Last Answer : Only the brake lights.
Description : If the ignition switch is placed in the ON position and all the engine instruments operate properly except the gas gauge, where would the fault probably be?
Last Answer : Between point (3) and the gas gauge tank unit ground.
Description : A station is known to operate at 60-meters. What is the frequency of the unknown station?
Last Answer : 5 megahertz.
Description : Is it possible for a transmission line to operate improperly at certain frequencies and properly at others?
Last Answer : Yes, it is quite common.
Description : Which type of optical source tends to operate at higher drive currents to produce light?
Last Answer : Laser.
Description : Why can multimode graded-index fiber 1300-nm systems using LEDs operate over longer distances and at higher bandwidths than 850-nm systems?
Last Answer : Longer distances and higher bandwidths are possible because fiber material losses and dispersion are significantly reduced at the 1300-nm region.
Description : A two-cavity klystron without a feedback path will operate as what type of circuit?
Last Answer : Amplifier.
Description : Vacuum tubes are designed to operate in what portion of the Ep - Ip
Last Answer : The linear portion.
Description : Most Navy tty sets operate at what speeds?
Last Answer : 60, 75, or 100 wpm.
Description : What meters operate from their own power sources?
Last Answer : Self-excited.
Description : Other than disk, what is another media used for backup files?
Last Answer : Magnetic tape.
Description : What can exposure to a magnetic field do to the data on a disk?
Last Answer : Destroy some or all of it.
Description : What type of hard disk drive interface has all of the controller card electronics included in the disk drive itself?
Last Answer : Integrated drive electronics (IDE).
Description : What type of disk drive interface has most of the electronics on a controller card mounted in the host computer?
Last Answer : ST-506/412 interface.
Description : The control electronics component of a floppy or hard disk drive performs what three main functions?
Last Answer : a. Spins the disk at the correct speed. b. Moves the heads across the recording surface. c. Tells the write/read heads when to write data and when to read it.
Description : Cartridge hard disk drives with 14" disk packs may require what additional types of preventive maintenance?
Last Answer : a. Cleaning with a special cleaning disk. b. Cleaning air filters. c. Cleaning spindles, rails, and slides. d. Cleaning and buffing read/write heads.
Description : Approximately how often should you clean a floppy disk drive that gets heavy use?
Last Answer : Once a month
Description : A kit for cleaning floppy disk drives contains what two items?
Last Answer : . a. A cloth or fiber cleaning disk. b. A bottle of cleaning solution.
Description : Why do floppy disk drives require more preventive maintenance than hard disk drives?
Last Answer : They are not sealed units, and they use flimsy plastic disks with an oxide coating that wears off and sticks to the heads
Description : In the actuator arm assembly of a hard disk drive transport, what device can position the magnetic heads to the correct track of a hard disk more accurately than a dc stepper motor?
Last Answer : Voice coil servo.
Description : Hard disk drive transports contain the electromechanical parts that perform what three functions?
Last Answer : a. Rotates the hard disk platters. b. Writes data to and reads data from the disk platters
Description : What part of a floppy disk drive transport contains the circuitry which controls the electromechanical parts of the transport?
Last Answer : Drive electronics circuit board.
Description : What part of a floppy disk drive transport uses a dc stepper motor to position the magnetic heads over the recording surface of a floppy disk?
Last Answer : Actuator arm assembly.
Description : The head arm assembly of a floppy disk drive transport has how many read heads and how many write heads?
Last Answer : Two read heads and two write heads.
Description : The drive motor of a 3-1/2", 1.44-MB floppy disk drive spins the disk at what RPM?
Last Answer : 600 RPM.
Description : What are the four most important parts of a floppy disk drive transport?
Last Answer : a. Drive motor/spindle assembly. b. Head arm assembly. c. Actuator arm assembly. d. Drive electronics circuit board.
Description : What method for encoding digital data enables you to store more data in less space by limiting the distance between pulses on a hard disk?
Last Answer : Run length-limited (RLL) encoding.
Description : Older, single-sided, single-density floppy disk drives would probably use what method for encoding digital data onto the floppy disk?
Last Answer : Frequency-modulation encoding.
Description : What is the most common method for erasing a hard disk?
Last Answer : Reformat the disk.
Description : What is the most common type of hard disk failure?
Last Answer : Head-crash.
Description : When computers use the cylinder method to store data on a hard disk pack, what three items make up the address that tells the computer where on a specific disk to store the data?
Last Answer : . a. Cylinder number. b. Recording surface number.
Description : What are the three most common sizes of hard disk platters?
Last Answer : 3-1/2 inches, 5-1/4 inches, and 14 inches.
Description : What three components determine the address that locates where on a floppy disk the computer will store the data?
Last Answer : a. disk side number, b. track number, and c. sector number.
Description : The process of formatting a floppy disk is called what type of sectoring?
Last Answer : Soft sectoring.
Description : What is the storage capacity of a 5-1/4" double-sided, high density floppy disk?
Last Answer : 1,200,000 bytes or 1.2 megabytes.
Description : What are the three levels of floppy disk density?
Last Answer : a. Single-density, b. double-density, and c. high-density.
Description : What type of floppy disk is made to store data on both sides of the disk
Last Answer : Double-sided.
Description : What is a floppy disk?
Last Answer : A thin, flexible platter coated with magnetic material so characters can be recorded.
Description : How does a magnetic drum differ from a magnetic disk?
Last Answer : The tracks in which the data is stored are assigned to channels that form circular bands around the drum.
Description : What two ways can data be physically organized on a disk pack?
Last Answer : By cylinder or sector.
Description : What precedes each record on a disk?
Last Answer : A disk address
Description : Why are disk storage devices popular?
Last Answer : Largely because of their direct access capabilities.
Last Answer : Largely because of their direct access capabilities
Description : What is less expensive to operate, a gas or electric range?
Last Answer : The cost to operate a gas or electric range will depend on utility cost in your area.
Description : What is antenna bandwidth? A. Antenna length divided by the number of elements B. The angle between the half-power radiation points C. The angle formed between two imaginary lines drawn through D. The frequency range over which an antenna can be expected to operate satisfactorily
Last Answer : D. The frequency range over which an antenna can be expected to operate satisfactorily