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- Question
A given signal's second harmonic is twice the given signal's __________ frequency...?
Options- A. Fourier
- B. Foundation
- C. Fundamental
- D. Field
- Correct Answer
- Fundamental
ExplanationA 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. - 1. What is the relationship between resistivity r and conductivity s?
Options- A. R = s2
- B. R = s
- C. R > s
- D. R = 1/s Discuss
- 2. Which is a type of Electrically-Erasable Programmable Read-Only Memory?
Options- A. Flash
- B. Flange
- C. Fury
- D. FRAM Discuss
- 3. 'DTP' computer abbreviation usually means?
Options- A. Digital Transmission Protocol
- B. DeskTop Publishing
- C. Data Type Programming
- D. Document Type Processing Discuss
- 4. '.TXT' extension refers usually to what kind of file?
Options- A. Text File
- B. Image file
- C. Audio file
- D. Adobe Acrobat file Discuss
- 5. Once the active medium is excited, the first photons of light are produced by which physical process?
Options- A. Blackbody radiation
- B. Spontaneous emission
- C. Synchrotron radiation
- D. Planck?s oscillation Discuss
- 6. '.BAK' extension refers usually to what kind of file?
Options- A. Backup file
- B. Audio file
- C. Animation/movie file
- D. MS Encarta document Discuss
- 7. What does VVVF stand for?
Options- A. Variant Voltage Vile Frequency
- B. Variable Velocity Variable Fun
- C. Very Very Vicious Frequency
- D. Variable Voltage Variable Frequency Discuss
- 8. '.MPG' extension refers usually to what kind of file?
Options- A. WordPerfect Document file
- B. MS Office document
- C. Animation/movie file
- D. Image file Discuss
- 9. The NTSC (National Television Standards Committee) is also used in the country of...?
Options- A. Japan
- B. France
- C. Germany
- D. England Discuss
- 10. 'DB' computer abbreviation usually means?
Options- A. Database
- B. Double Byte
- C. Data Block
- D. Driver Boot Discuss
Technology problems
Search Results
Correct Answer: R = 1/s
Correct Answer: Flash
Explanation:
It's commonly used for MP3 players, computer BIOS code and "thumb" drives. Originally developed in Japan by Toshiba, it has become quite popular for products requiring non-volatile erasable memory. Flash devices have a limited number of erase cycles (typically 10,000 to 1,000,000 cycles) so they're not as good a choice for applications in which the data changes constantly. However, since it has no moving parts (unlike a hard disk) it is an excellent choice for storing the operating code for small personal electronics like PDAs, cell phones, digital cameras, and the data in items like MP3 players.
Correct Answer: DeskTop Publishing
Correct Answer: Text File
Correct Answer: Spontaneous emission
Explanation:
Spontaneous emission is what you see with most "glow in the dark" toys. You excite the toy by exposing it to bright light, then the toy glows in the dark by spontaneously emitting photons as the excited atoms relax back down to their normal state.
Correct Answer: Backup file
Correct Answer: Variable Voltage Variable Frequency
Explanation:
It is a method of controlling the speed of an AC induction motor, whereby speed, current and torque can all be accurately controlled.
Correct Answer: Animation/movie file
Correct Answer: Japan
Correct Answer: Database
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