Which of the following noise must be considered at high frequencies (microwave frequencies)?

Which of the following noise must be considered at high frequencies (microwave frequencies)? (1) Shot noise (2) Random noise (3) Impulse noise (4) Transit time noise
by

1 Answer

Answer :

Which of the following noise must be considered at high frequencies (microwave frequencies)? (1) Shot noise (2) Random noise (3) Impulse noise (4) Transit time noise

by

Related questions

Which of the following low noise transistors is commonly used at microwave frequencies? A. MOSFET B. GASFET C. MESFET D. JFET

Description : Which of the following low noise transistors is commonly used at microwave frequencies? A. MOSFET B. GASFET C. MESFET D. JFET

Last Answer : C. MESFET

One of the potential health effects of exposure to high levels of noise is called tinnitus (pron: ti - NI - tes), which means: w) a permanent loss of hearing. x) a persistent ringing or hissing in the ears after exposure. y) a temporary loss of hearing, especially of upper frequencies. z) abdominal discomfort from low frequency noise.

Description : One of the potential health effects of exposure to high levels of noise is called tinnitus (pron: ti - NI - tes), which means: w) a permanent loss of hearing. x) a persistent ringing ... ) a temporary loss of hearing, especially of upper frequencies. z) abdominal discomfort from low frequency noise.

Last Answer : ANSWER: X -- A PERSISTENT RINGING OR HISSING IN THE EARS AFTER EXPOSURE.

. Why are coaxial lines more efficient at microwave frequencies than two-wire transmission lines?

Description : . Why are coaxial lines more efficient at microwave frequencies than two-wire transmission lines?

Last Answer : The electromagnetic fields are completely confined

Which of the following types of noise becomes of great importance at frequencies? A. Shot noise B. Random noise C. Impulse noise D. Transit-time noise

Description : Which of the following types of noise becomes of great importance at frequencies? A. Shot noise B. Random noise C. Impulse noise D. Transit-time noise

Last Answer : D. Transit-time noise

Atmospheric noise becomes less severe at frequencies A. above 30 MHz B. below 30 MHz C. above 3000 kHz D. below 3000kHz

Description : Atmospheric noise becomes less severe at frequencies A. above 30 MHz B. below 30 MHz C. above 3000 kHz D. below 3000kHz

Last Answer : A. above 30 MHz

Atmospheric noise or static is not a great problem A. at frequencies below 20 MHz B. at frequencies below 5 MHz C. at frequencies above 30 MHz D. at frequencies above 1 MHz

Description : Atmospheric noise or static is not a great problem A. at frequencies below 20 MHz B. at frequencies below 5 MHz C. at frequencies above 30 MHz D. at frequencies above 1 MHz

Last Answer : C. at frequencies above 30 MHz

What noise is observable at frequencies in the range from about 8 MHz to somewhat 1.5 GHz? A. Industrial noise B. Atmospheric noise C. Space noise D. Shot noise

Description : What noise is observable at frequencies in the range from about 8 MHz to somewhat 1.5 GHz? A. Industrial noise B. Atmospheric noise C. Space noise D. Shot noise

Last Answer : C. Space noise

When no signal is being received, the loudspeaker is not entirely silent as a result of the presence of A. parasitic oscillations in some of the receiver stages. B. negative feedback in each stage. C. spurious frequencies as a result of improper neutralization. D. internal receiver noise.

Description : When no signal is being received, the loudspeaker is not entirely silent as a result of the presence of A. parasitic oscillations in some of the receiver stages. B. negative feedback in each stage. C. spurious frequencies as a result of improper neutralization. D. internal receiver noise.

Last Answer : D. internal receiver noise.

The band of frequencies least susceptible to atmospheric noise and interference is: A. 30 – 300 kHz B. 300 – 3000 kHz C. 3 – 30 MHz D. 300 – 3000 MHz

Description : The band of frequencies least susceptible to atmospheric noise and interference is: A. 30 – 300 kHz B. 300 – 3000 kHz C. 3 – 30 MHz D. 300 – 3000 MHz

Last Answer : D. 300 – 3000 MHz

What is the mixing process? A. Distortion caused by auroral propagation B. The combination of two signals to produce sum and difference frequencies. C. The elimination of noise in wideband receiver by phase differentiation D. The elimination of noise in a wideband receiver by phase comparison

Description : What is the mixing process? A. Distortion caused by auroral propagation B. The combination of two signals to produce sum and difference frequencies. C. The elimination of noise in wideband receiver by phase differentiation D. The elimination of noise in a wideband receiver by phase comparison

Last Answer : B. The combination of two signals to produce sum and difference frequencies.

Atmospheric noise is less at severe frequencies above A. Audio level B. 30 MHz C. 10 GHz D. 1 GHz

Description : Atmospheric noise is less at severe frequencies above A. Audio level B. 30 MHz C. 10 GHz D. 1 GHz

Last Answer : B. 30 MHz

Emission on a frequency or frequencies immediately outside the necessary bandwidth which result from the modulation process except spurious emission. A. Radiation B. Noise C. Out of the band D. Interference

Description : Emission on a frequency or frequencies immediately outside the necessary bandwidth which result from the modulation process except spurious emission. A. Radiation B. Noise C. Out of the band D. Interference

Last Answer : C. Out of the band

Extra-terrestrial noise is observable at frequencies from A. 0 to 20 KHz B. Above 2 GHz C. 8 to 1.43 GHz D. 5 to 8 GHz

Description : Extra-terrestrial noise is observable at frequencies from A. 0 to 20 KHz B. Above 2 GHz C. 8 to 1.43 GHz D. 5 to 8 GHz

Last Answer : C. 8 to 1.43 GHz

One of the reasons why FDM is being replaced by TDM is A. noise is amplified with voice when an FDM system is used B. it is difficult to place channels side by side C. there is more time than frequency D. Most available frequencies has been used

Description : One of the reasons why FDM is being replaced by TDM is A. noise is amplified with voice when an FDM system is used B. it is difficult to place channels side by side C. there is more time than frequency D. Most available frequencies has been used

Last Answer : A. noise is amplified with voice when an FDM system is used

What does the noise weighting curve shows? A. Noise signals measured with a 144 handset B. Power levels of noise found in carrier systems C. The interfering effect of other frequencies in a voice channel compared with a reference frequency of one kilohertz D. Interfering effects of signals compared with a 3-kHz tone

Description : What does the noise weighting curve shows? A. Noise signals measured with a 144 handset B. Power levels of noise found in carrier systems C. The interfering effect of other frequencies in a voice ... a reference frequency of one kilohertz D. Interfering effects of signals compared with a 3-kHz tone

Last Answer : C. The interfering effect of other frequencies in a voice channel compared with a reference frequency of one kilohertz

What does it mean when a microwave makes a whistling noise every time it is being used?

Description : What does it mean when a microwave makes a whistling noise every time it is being used?

Last Answer : Could be a leak in the seal of the door. I think I’d call a microwave store or department and ask what to do about it, if that is what it is.

The transistor with the lowest noise figure in the microwave region is a A. MOSFET B. Dual-gate MOSFET C. JFET D. MESFET

Description : The transistor with the lowest noise figure in the microwave region is a A. MOSFET B. Dual-gate MOSFET C. JFET D. MESFET

Last Answer : D. MESFET

To avoid objectionable noise in a microwave TV link, the SNR should be about:

Description : To avoid objectionable noise in a microwave TV link, the SNR should be about:

Last Answer : 25 or more

Which of the following device is used for coupling microwave energy?

Description : Which of the following device is used for coupling microwave energy?  A) Resonator B) Waveguide C) Loop D) Antenna

Last Answer : A

Which of the following is a negative-resistance microwave device for oscillator applications?

Description :  Which of the following is a negative-resistance microwave device for oscillator applications? A) IMPATT Diode B) Gunn Diode C) Snap diode D) Schottky Diode 

Last Answer :  Which of the following is a negative-resistance microwave device for oscillator applications? A) IMPATT Diode B) Gunn Diode C) Snap diode D) Schottky Diode 

In a microwave magic-T, E plane and H plane are

Description : In a microwave magic-T, E plane and H plane are  a) In phase b) Out of phase c) Isolated d) 90o out of phase

Last Answer : In a microwave magic-T, E plane and H plane are Isolated 

In a microwave test bench, why is the microwave signal amplitude modulated at 1 kHz?

Description : In a microwave test bench, why is the microwave signal amplitude modulated at 1 kHz?  (1) To increase the sensitivity of measurement (2) To transmit the signal to a far-off place (3) To study amplitude modulation (4) Because crystal detector fails at microwave frequencies

Last Answer : In a microwave test bench, why is the microwave signal amplitude modulated at 1 kHz?  Because crystal detector fails at microwave frequencies

Sometimes microwave signals follow the earth’s curvature. This due to

Last Answer : Sometimes microwave signals follow the earth’s curvature. This due to Ducting.

Waveguide are used mainly for microwave signals because

Last Answer : Waveguide are used mainly for microwave signals because They would be too bulky at lower frequencies.

Microwave links are preferred for TV transmission because?

Last Answer : Microwave links are preferred for TV transmission because They produce less phase distortion

Antenna commonly used for microwave links are

Last Answer : Antenna commonly used for microwave links are Paraboloidal dishes.

A disadvantage of using a trap antenna. A. It will radiate harmonics B. It can only be used for single-bad operation C. It is too sharply directional at lower frequencies D. It must be neutralized

Description : A disadvantage of using a trap antenna. A. It will radiate harmonics B. It can only be used for single-bad operation C. It is too sharply directional at lower frequencies D. It must be neutralized

Last Answer : A. It will radiate harmonics

In communication systems, noise due to quantization error is

Description : In communication systems, noise due to quantization error is a) Linear and signal dependent b) Non-linear and signal dependent c) Linear and signal independent at low frequencies only d) non -linear and signal dependent at low frequencies only

Last Answer : In communication systems, noise due to quantization error is Linear and signal dependent

The term “white noise” refers to the following:

Description : The term “white noise” refers to the following: (1) A random signal with flat power spectral density (2) A random signal generated by beat signal (3) A random signal with long range correlation (4) All of the above are true 

Last Answer : The term “white noise” refers to the following: A random signal with flat power spectral density

The modulation system inherently most noise resistant is:

Description : The modulation system inherently most noise resistant is:  (1) Frequency modulation (2) Pulse width modulation (3) Pulse code modulation (4) Phase modulation

Last Answer : The modulation system inherently most noise resistant is: Pulse code modulation.

In a PCM system of telemetry, the quantization noise depends on:

Description : In a PCM system of telemetry, the quantization noise depends on:  (1) The sampling rate and quantization level (2) The sampling rate only (3) The number of quantization level (4) Information provided is not sufficient

Last Answer : In a PCM system of telemetry, the quantization noise depends on: The number of quantization level.

The input to a coherent detector is DSB-SC signal plus noise. The noise at the detector output is: ...

Description : The input to a coherent detector is DSB-SC signal plus noise. The noise at the detector output is:  (1) The in-phase component (2) The quadrature-component (3) Zero (4) The envelope

Last Answer : The input to a coherent detector is DSB-SC signal plus noise. The noise at the detector output is: Zero.

The noise is more dominant in which of the following:

Description : The noise is more dominant in which of the following:  (1) PAM (2) PWM (3) PPM (4) FSK

Last Answer : The noise is more dominant in PAM.

Frequency modulation gives - - - noise

Last Answer : Frequency modulation gives Less noise

Quantising noise can be reduced by increasing

Last Answer : Quantising noise can be reduced by increasing Number of standard quantum levels.

The thermal noise is due to random

Last Answer : The thermal noise is due to random Motion of free electrons.

What illumination factor is normally considered in computing parabolic antenna gain in microwave communications? A. 0.54 B. 0.65 C. 0.75 D. 0.85

Description : What illumination factor is normally considered in computing parabolic antenna gain in microwave communications? A. 0.54 B. 0.65 C. 0.75 D. 0.85

Last Answer : A. 0.54

Which of hte following is considered a broad band communication channel? a. coaxial cable b. fiber optics cable c. microwave circuits d. all of above

Description : Which of hte following is considered a broad band communication channel? a. coaxial cable b. fiber optics cable c. microwave circuits d. all of above

Last Answer : all of above

In a NOR gate all inputs must be - - - to get high output

Last Answer :  In a NOR gate all inputs must be Low to get high output

Sounds above what level are considered hazardous noise pollution?

Description : Sounds above what level are considered hazardous noise pollution?

Last Answer : Sounds above what level are considered hazardous noise pollution? A. 180 dB B. 140 dB C. 100 dB D. 80 dB

Sounds above what level are considered hazardous noise pollution?

Description : Sounds above what level are considered hazardous noise pollution?

Last Answer : Sounds above what level are considered hazardous noise pollution? A. Above 30 dB B. Above 80 dB C. Above 100 dB D. Above 120 dB

What is considered the most obvious conveyor of information? A. Sound B. Speech C. Music D. Noise

Description : What is considered the most obvious conveyor of information? A. Sound B. Speech C. Music D. Noise

Last Answer : B. Speech

Considered as the main source of an internal noise. A. Device imperfection B. Thermal agitation C. Temperature change D. Flicker

Description : Considered as the main source of an internal noise. A. Device imperfection B. Thermal agitation C. Temperature change D. Flicker

Last Answer : B. Thermal agitation

Sounds above what level are considered hazardous noise pollution? (a) Above 80 dB (b) Above 30 dB (c) Above 150 dB (d) Above 120 dB

Description : Sounds above what level are considered hazardous noise pollution? (a) Above 80 dB (b) Above 30 dB (c) Above 150 dB (d) Above 120 dB

Last Answer : (d) Above 120 dB

Does acrylic absorb or transmit high intensities from electromagnetic frequencies?

Description : Does acrylic absorb or transmit high intensities from electromagnetic frequencies?

Last Answer : answer:Depends what colour it is .. That is what colour is. The electromagnetic spectrum is broad. Some waves are many times the size of buildings, others are tinier than atoms. A small ... it to reflect/absorb different wavelengths (frequencies) of the visible region is how the colour is created

Electrical machinery insulation will break down more rapidly due to _________________. A. low loading of motors and generators B. frequent megger testing C. high temperatures and vibration D. high operating frequencies

Description : Electrical machinery insulation will break down more rapidly due to _________________. A. low loading of motors and generators B. frequent megger testing C. high temperatures and vibration D. high operating frequencies

Last Answer : Answer: C

A porous material is far more efficient at high than low frequency absorption. How to improve sound absorption at lower frequencies using this absorber? A. Increase the thickness B. Decrease the thickness C. Mount with and airspace behind D. Both A and C above

Description : A porous material is far more efficient at high than low frequency absorption. How to improve sound absorption at lower frequencies using this absorber? A. Increase the thickness B. Decrease the thickness C. Mount with and airspace behind D. Both A and C above

Last Answer : D. Both A and C above

The ___________ filter attenuates signals but passes frequencies below and above that band. A. low pass B. band pass C. band stop D. high pass

Description : The ___________ filter attenuates signals but passes frequencies below and above that band. A. low pass B. band pass C. band stop D. high pass

Last Answer : C. band stop

High quality music only needs frequencies up to A. 10 Hz B. 15 Hz C. 20 kHzD. 15 kHz

Description :  High quality music only needs frequencies up to A. 10 Hz B. 15 Hz C. 20 kHz D. 15 kHz

Last Answer : D. 15 kHz