Basic Communication III

通報

問題一覧

It is referred as Hectometric Wave.

It is referred as Short Waves.

What is minimum frequency range is used in two way communication?

At what frequency range does FM broadcasting is?

VHF

TV Broadcasting belong to what frequency range?

VHF and UHF

At what frequency ranges does cellular telephones belong?

UHF

At what frequency range does Bluetooth and WLAN belong?

SHF

It is referred as Milimetric Waves

EHF

EHF ranges from _____

30 GigaHertz to 300 GigaHertz

It is right above millimeter wave region.

Optical Spectrum

These are electromagnetic signals produced primarily by heat sources

Infrared Waves

Infrared range from ______ to _____

700 nanometer to 10 micrometer

What electromagnetic wave is used in missile guiding and object detection?

Infrared

Infrared range from ____ to _____

300 GHz to 300 THz

Visible light wavelength is _____ to _____.

400 nanometer to 800 nanometer

Visible Light range from ____ to _____.

900 THz to 3 PHz

There is more spectrum space available at the ____

higher frequencies

It regulates the use of the spectrum, and most forms of electronic communications.

FCC

Specifications and guidelines that companies and individuals follow, to ensure compatibility between transmitting and receiving equipment in communication systems

Standards

It describe the ability of equipment from one manufacturer to work compatibly with that of another equipment.

Interoperability

Tuned Circuit is made of _____ and _____ resonating at ____ frequency.

Capacitor, Inductor, Specific

It refers to capacitor having resistance, inductance, and dielectric leakage.

Residuals

Low series resistance, and inductance, and high leakage resistance can be ignored at ___ frequencies.

low

Low series resistance, and inductance, and high leakage resistance can be solved by:

having short leads.

What occurs between two conductors close to each other?

Any of these

It refers to tendency of electrons flowing on the conductor surface rather than at center due to high current frequencies.

Skin Effect

It refers to ratio of power to the power dissipated by coil resistance.

Q Factor

In series circuit, if resistance increases, bandwidth ________

increases

What does high Q Factor indicates?

Selectivity

In most communication system, the Q Factor is at least ____

It is used to eliminate mixer output.

Filters

Active Filters does not need _____

inductor

What is true about Band Pass Filters?

Band Pass Filter pass frequencies below upper cutoff frequency and pass frequencies above lower cutoff frequency.

How to construct a Low Pass Filter?

It has resistor parallel to output and inductor series to output.

_____ is the signal attenuation in the passband of the filter.

Insertion Loss

_____ is the ratio of the stop bandwidth to the pass bandwidth of a bandpass filter

Shape Factor

It is the time it takes for a specific point on an input waveform to pass through the filter.

Envelope Delay

It is the rate of change of amplitude with frequency in a filter.

Roll Off

It is LC filter with maximum flatness in response in the pass band and a uniform attenuation with frequency.

Butterworth Filter

The attenuation rate of Butterworth just outside the passband is ______ as can be achieved with other types of filters.

not as great

It has extremely good selectivity, high attenuation rate or roll-off, much higher than that of the Butterworth filter.

Chebyshev

It produce an even greater attenuation or roll-off rate than do Chebyshev filters and greater attenuation out of the passband.

Cauer

Filters used in most communication receivers and transmitters because they are relatively small and inexpensive

Ceramic

It is a type of crystal filter designed to provide the exact selectivity required by a given application.

SAW

It is response of the filter.

Comb Response

How to improve receiver selectivity?

High Q Filters

What must be considered in designing audio filter using Op Amp?

Bandwidth Characteristics

What can be prevented using multisection Op Amp RC audio filter?

Any of these

A receiver has noise figure of 3.505 dB and gain of 50 dB. If it has bandwidth of 20 MHz, what is the noise equivalent temperature?

360 K

The 600 Ohm transmitter sends out 40 Watt carrier signal. Provided that the receiver has 600 MHz Bandwidth, what is the Signal to Noise Ratio if the temperature of the transmitter reaches up to 200 degrees Celsius?

150 dB

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