## Technology Questions and Answers Part-7

1. What frequency range is the High Frequency band?
a) 100 kHz
b) 1 GHz
c) 30 to 300 MHz
d) 3 to 30 MHz

Explanation: 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.

2. The first step to getting output from a laser is to excite an active medium. What is this process called?
a) Pumping
b) Exciting
c) Priming
d) Raising

Explanation: 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.

3. What is the relationship between resistivity r and conductivity s?
a) R = s2
b) R = s
c) R > s
d) R = 1/s

Explanation: No explanation is given for this question

4. Which motor is NOT suitable for use as a DC machine?
a) Permanent magnet motor
b) Series motor
c) Squirrel cage motor
d) Synchronous motor

Explanation: The squirrel cage motor is the only one without any connection to the armature.

5. A given signal's second harmonic is twice the given signal's __________ frequency?
a) Fourier
b) Foundation
c) Fundamental
d) Field

Explanation: 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.

6. In which decade was the ARRL founded?
a) 1940s
b) 1930s
c) 1920s
d) 1910s

Explanation: On April 6, 1914, Hiram Percy Maxim proposed the formation of the American Radio Relay League.

7. 'CD' computer abbreviation usually means ?
a) Command Description
b) Change Data
c) Copy Density
d) Compact Disc

Explanation: No explanation is given for this question

8. '.BAK' extension refers usually to what kind of file?
a) Backup file
b) Audio file
c) Animation/movie file
d) MS Encarta document

Explanation: No explanation is given for this question

9. Where is the headquarters of Intel located?
a) Redmond, Washington
b) Tucson, Arizona
c) Santa Clara, California
d) Richmond, Virginia