Description : What are the three functions of the magnetic heads on a magnetic recording device?
Last Answer : a. Record the signal onto the recording medium. b. Reproduce the signal from the recording medium. c. Erase the signal from the recording medium.
Description : What three formats are used for digital magnetic tape recording?
Last Answer : 1) Serial, (2) parallel, and (3) serial-parallel.
Description : In digital magnetic tape recording, the series of recorded digital pulses can represent what three types of data?
Last Answer : a. Data used by digital computers. b. Pulsed squarewave signals. c. Digitized analog waveforms.
Description : What two preventive maintenance actions must you do regularly to increase magnetic head life and to ensure good tape recording and playback?
Last Answer : a. Keep the heads clean. b. Keep the heads demagnetized.
Description : What are four types of tape errors that can degrade a magnetic recording system’s performance?
Last Answer : Signal dropout, noise, skew, and level. Dropout is the most common.
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 : What is the meaning of the term recording medium as it pertains to magnetic recording?
Last Answer : A recording medium is any material that has the ability to become magnetized, in varying amounts, in small sections along its entire length.
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 determines the number of field poles required to establish a rotating magnetic field in a multiphase motor stator?
Last Answer : The number of phases in the applied voltage.
Description : Which digital data encoding method helps overcome a tape recorder’s low-frequency response problems by recording two logic levels for each incoming data bit?
Last Answer : Bi-phase level encoding.
Description : What format of digital tape recording is normally used to record instrumentation or telemetry data?
Last Answer : Serial digital magnetic tape recording.
Description : What format of digital tape recording takes a serial input stream of data pulses, breaks them up, and records them on more than one data track?
Last Answer : Serial-parallel digital magnetic tape recording.
Description : What format of digital tape recording is normally used to store computer data?
Last Answer : Parallel digital magnetic tape recording.
Description : J-K FFs used in counters are wired to perform what function?
Last Answer : Toggle.
Description : What type of flowchart is constructed by the programmer to represent the sequence of operations the computer is to perform to solve a specific problem?
Last Answer : A programming flowchart.
Description : In a general-purpose computer, the ability to perform a wide variety of operations is achieved at the expense of what capabilities?
Last Answer : Speed and efficiency.
Description : . How is a general-purpose computer able to perform different operations?
Last Answer : By storing different programs in its internal storage
Description : A computer that is designed to perform a specific operation and usually satisfies the needs of a particular type of problem, is said to be what type of computer?
Last Answer : Special-purpose.
Description : To perform microminiature component repair, a 2M technician must be currently certified in what area?
Last Answer : Microminiature component repair.
Description : What four basic functions must a receiver perform?
Last Answer : Reception, selection, detection, and reproduction.
Description : What purpose does a microphone perform in an AM transmitter?
Last Answer : It converts audio (sound) into electrical energy.
Description : What function does a receiver transfer switchboard perform?
Last Answer : Transfers receiver audio outputs to remote control stations.
Description : Why do end users perform fiber geometry measurements in the laboratory?
Last Answer : To reduce system attenuation and coupling loss resulting from poor fiber fabrication.
Description : Who should perform CPR?
Last Answer : Only trained, qualified personnel.
Description : The data recording format in most of the modern magnetic tape is A) 7-bit ASCII B) 7-bit EBCDIC C) 8-bit ASCII D) 8-bit EBCDIC
Last Answer : Answer : D
Description : The data recording format in most of the modern magnetic tape is a. 7-bit ASCII b. 7-bit EBCDIC c. 8-bit ASCII d. 8-bit EBCDIC
Last Answer : 8-bit EBCDIC
Last Answer : d. 8-bit EBCDIC
Last Answer : Magnetic recording tape is most commonly made from ferric oxide.
Description : ______ is most commonly used for making magnetic recording tape.
Last Answer : Ferric oxide is most commonly used for making magnetic recording tape.
Description : What the three basic components make up the typical magnetic amplifier?
Last Answer : Two saturable reactors and a transformer.
Description : The way a magnetic head will be used determines how it is constructed. Name three factors that determine the final construction of a magnetic head.
Last Answer : a. Type of head (record, reproduce, or erase). b. Frequencies it will record or reproduce. c. Whether it will be used on a single or multitrack recorder.
Description : Magnetic tape recorders can have up to three different heads installed. What are the three functions performed by a recorder's heads?
Last Answer : Record, reproduce, and erase.
Description : When magnetic tapes are ruined, what three factors are normally the cause?
Last Answer : Poor handling, improper storage, or shipping damage.
Description : If magnetic tape is stored in areas with temperature and humidity extremes, what are three types of tape damage that may occur?
Last Answer : Oxide shedding, layer-to-layer sticking, and tape deformation.
Description : Magnetic tape is made of what three basic materials?
Last Answer : a. Base material. b. Coating of magnetic oxide particles. c. Glue that bonds the particles to the base.
Description : What are the three most popular methods for encoding digital data onto magnetic disks?
Last Answer : a. Frequency modulation (FM). b. Modified frequency modulation (MFM). c. Run length limited (RLL).
Description : Digital magnetic tape recorders used to store and retrieve digital data fall into what three categories?
Last Answer : a. Computer-compatible digital tape recorders. b. Telemetry digital tape recorders. c. Instrumentation digital tape recorders
Description : The reactive power drawn by a motor from an AC generator is the power which is _____________. A. used to establish the magnetic field of the motor B. lost in overcoming friction in the ... by current flow through the windings D. transmitted directly through the rotor shaft to perform useful work
Last Answer : Answer: A
Description : What three things prevent a CT rotor from turning when voltages are applied to its stator windings?
Last Answer : The rotor is specially wound, it is never connected to an ac supply, and its output is always applied to a high-impedance load.
Description : . What primary condition must magnetic lines of force meet in order to exist?
Last Answer : Magnetic lines of force must form a continuous closed loop.
Description : When the magnetic field of the inductor is completely collapsed, where is the energy of the tank circuit stored?
Last Answer : . Capacitor.
Description : List two common usages of magnetic amplifiers
Last Answer : Servosystems, temperature recorders, or power supplies
Description : What is used to bias a magnetic amplifier so that the control winding remains free to accept control (input) signals?
Last Answer : A bias winding and associated circuitry.
Description : What is the purpose of the rectifier in a magnetic amplifier?
Last Answer : The rectifier eliminates hysteresis loss.
Description : At what portion of the magnetization curve should a magnetic amplifier be operated?
Last Answer : . The knee of the curve.
Description : What is the basic principle of a magnetic amplifier?
Last Answer : change in inductance in a series LR circuit causes a change in true power.
Description : What is the frequency classification of a magnetic amplifier
Last Answer : An audio (or low) frequency power amplifier.
Description : What two basic types of magnetic devices are used as error detectors?
Last Answer : E-transformer and control transformers.
Description : What is the effect on magnetron operation if the magnetic field strength is too high?
Last Answer : The magnetron will not oscillate.