21⟩ In which year was MIDI(dress) introduced?
1983
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180 Information Technology Questions And Answers
22⟩ What does the term PLC stand for?
Programmable Logic Controller.
Used in manufacturing, engineering, and process operations.
23⟩ A given signal's second harmonic is twice the given signal's __________ frequency...?
Fundamental.
A given signal's second harmonic is twice the given signal's fundamental frequency. Harmonics are generated when there are non-linearities in an amplifier (there are always non-linearities). The worse the non-linearities, the more harmonics. A signal at 27.5 MHz (approximate frequency for US citizen's band) would have a second harmonic at 55.0 MHz (on US channel 2!). Can you see why there might be problems? A CB operator might do well to place a low-pass filter on his radio.
24⟩ What is the term to ask the computer to put information in order numerically or alphabetically?
Sort
25⟩ What is the relationship between resistivity r and conductivity s?
R = 1/s
26⟩ Voltage is sometimes referred to as EMF, or Electromotive?
Force.
The term EMF, or Electromotive Force, its use now in decline, is attributed to Italian physicist Alessandro Volta (1745-1827). Today we generally use the term "voltage" - can you guess why we call it that?
27⟩ What was the active medium used in the first working laser ever constructed?
A ruby rod.
Theodore Maiman built the first working laser using a ruby rod while working at Hughes Research Laboratories in Malibu, California. It lased for the first time on May 16, 1960.
28⟩ Larger buildings may be supplied with a medium voltage electricity supply, and will required a substation or mini-sub. What is the main item of equipment contained in these?
Transformer.
The transformer is used to transform a medium voltage supply to a low voltage supply, e.g. from 11 000 V to 400 V. A transformer is rated in kVA, kilo-Volt-Amps, which is a measurement of electrical power.
29⟩ '.BAK' extension refers usually to what kind of file?
Backup file
30⟩ Where is the headquarters of Intel located?
Santa Clara, California.
31⟩ Who co-created the UNIX operating system in 1969 with Dennis Richie?
Ken Thompson
32⟩ What does EPROM stand for?
Erasable Programmable Read Only Memory.
A chip found in alomst every microprocessor.
33⟩ 'CD' computer abbreviation usually means?
Compact Disc.
Compact disc (CD) is a digital optical disc data storage format. The format was originally developed to store and play only sound recordings but was later adapted for storage of data (CD-ROM).
34⟩ Who built the world's first binary digit computer Z1?
Konrad Zuse.
35⟩ Which motor is NOT suitable for use as a DC machine?
Squirrel cage motor.
The squirrel cage motor is the only one without any connection to the armature.
36⟩ What is part of a database that holds only one type of information?
Field.
37⟩ 'OS' computer abbreviation usually means?
Operating System.
38⟩ In which decade was the ARRL founded?
1910s.
On April 6, 1914, Hiram Percy Maxim proposed the formation of the American Radio Relay League.
39⟩ What is the first step to getting output from a laser is to excite an active medium. What is this process called?
Pumping.
A collection of atoms or molecules that can be excited to a higher energy state is called an active medium. Before lasing can occur, the active media is "pumped". The process of raising the atoms in the active media from a lower energy state to a higher state is like pumping water up from a well.
40⟩ What frequency range is the High Frequency band?
3 to 30 MHz.
The HF band is based on frequencies 3 to 30 Mhz. AM radio stations are in the HF band but normally are stated in kilohertz.
