Podcast
Questions and Answers
Which of the following crystal is commonly used in microphones
Which of the following crystal is commonly used in microphones
- Quartz
- Rochelle salt (correct)
- Tournaline
- ADP
The Theory of radio waves was orginated by:
The Theory of radio waves was orginated by:
- Bell
- Maxwell (correct)
- Hertz
- Marconi
Which of the steps is not included in the process of reception?
Which of the steps is not included in the process of reception?
- Encoding (correct)
- Storage
- Interpretation
- Decoding
Man-made noise is cause by
Man-made noise is cause by
Standard design reference for environmental noise temperature
Standard design reference for environmental noise temperature
Standardized as the amplitude of the carrier voltage modulated 30% by 400Hz signal which when applied to the receiver input through a standard antenna will develop an output of 0.5W in a resistive load
Standardized as the amplitude of the carrier voltage modulated 30% by 400Hz signal which when applied to the receiver input through a standard antenna will develop an output of 0.5W in a resistive load
_______ is measured on a circuit when it is correctly terminated but does not have any traffic
_______ is measured on a circuit when it is correctly terminated but does not have any traffic
Distortion is caused by
Distortion is caused by
Which of broad classifications of noise are most difficult to treat?
Which of broad classifications of noise are most difficult to treat?
The most common unit of noise measurement in white noise voltage testing
The most common unit of noise measurement in white noise voltage testing
The difference between signal strength at a given point and a reference level is ______
The difference between signal strength at a given point and a reference level is ______
The ratio of the level of the modulated output of a transmitter under conditions of standard test modulation to the level of the demodulated output with no modulation applied both measured with the same bandwidth
The ratio of the level of the modulated output of a transmitter under conditions of standard test modulation to the level of the demodulated output with no modulation applied both measured with the same bandwidth
What type of circuit reduces even order harmonics?
What type of circuit reduces even order harmonics?
"Pink" noise has:
"Pink" noise has:
Random interference to transmitted signal is called
Random interference to transmitted signal is called
Quantizing noise occurs in
Quantizing noise occurs in
_______ is the noise created by man
_______ is the noise created by man
A special service that any individual may use for personal communication with others
A special service that any individual may use for personal communication with others
Crosstalk dues to incomplete suppression of sideband or to intermodulation of two or more frequency-multiplexed channels which is unintelligible is classified as
Crosstalk dues to incomplete suppression of sideband or to intermodulation of two or more frequency-multiplexed channels which is unintelligible is classified as
Which expression indicates a measurement using a 1-W reference
Which expression indicates a measurement using a 1-W reference
Recovering information from a carrier is known as
Recovering information from a carrier is known as
________ is measured on a circuit when it is correctly terminated but does not have any traffic
________ is measured on a circuit when it is correctly terminated but does not have any traffic
In a communication system noise is likely to affect the signal
In a communication system noise is likely to affect the signal
If bandwidth is double, the signal power is ____
If bandwidth is double, the signal power is ____
In telecommunications, what do we call the difference in the voltage levels between a driver and a terminator
In telecommunications, what do we call the difference in the voltage levels between a driver and a terminator
Which of the following can be called a troubleshooting plan?
Which of the following can be called a troubleshooting plan?
Television broadcasting occurs in which range
Television broadcasting occurs in which range
External noise field are measured in terms of ______
External noise field are measured in terms of ______
Collection of one or more electronic devices or circuits that converts the original source information to a form more suitable for transmission over a particular transmission medium
Collection of one or more electronic devices or circuits that converts the original source information to a form more suitable for transmission over a particular transmission medium
Which of the following is not true?
Which of the following is not true?
The person who sent the first radio signal across the Atlantic ocean was:
The person who sent the first radio signal across the Atlantic ocean was:
The acoustic channel is used for which of the following?
The acoustic channel is used for which of the following?
Cosmic noise is produced by
Cosmic noise is produced by
Absolute temperature in Kelvin
Absolute temperature in Kelvin
Two tuned circuit are said to be ______ each other when the resonant frequencies can be made to vary in the same proportion by rotating a common shaft
Two tuned circuit are said to be ______ each other when the resonant frequencies can be made to vary in the same proportion by rotating a common shaft
Occurs when two or more signals combine in a linear device
Occurs when two or more signals combine in a linear device
The collection of sinusoidal frequencies present in a modulated carrier is called its:
The collection of sinusoidal frequencies present in a modulated carrier is called its:
Space noise generally covers a wide frequency spectrum, but the strongest interference occurs
Space noise generally covers a wide frequency spectrum, but the strongest interference occurs
What is the major cause of atmospheric or static noise?
What is the major cause of atmospheric or static noise?
Interfering effect of noise, C message weighted, is
Interfering effect of noise, C message weighted, is
the process of converting a frequency or band of frequencies to another location in the frequency spectrum
the process of converting a frequency or band of frequencies to another location in the frequency spectrum
Distortion occurs when the _____ harmonic components of a digital square wave are lost.
Distortion occurs when the _____ harmonic components of a digital square wave are lost.
When two noise voltages, V1 and V2 are combined, the total voltage Vt is:
When two noise voltages, V1 and V2 are combined, the total voltage Vt is:
The communication medium causes the signal to be
The communication medium causes the signal to be
Noise always affects the signal in a communication system at the ______
Noise always affects the signal in a communication system at the ______
A voltage change that is equal to twice its original value correspond to a change of
A voltage change that is equal to twice its original value correspond to a change of
Electromagnetic radiation generally associated with heat and is used in heat seeking guidance systems, photography and astronomy
Electromagnetic radiation generally associated with heat and is used in heat seeking guidance systems, photography and astronomy
Atmospheric noise or static is not a great problem
Atmospheric noise or static is not a great problem
Which of the following is not an example of external noise
Which of the following is not an example of external noise
Which standard recommends crosstalk limits?
Which standard recommends crosstalk limits?
The noise power generated by a resistor is proportional to
The noise power generated by a resistor is proportional to
The _____ the equivalent noise temperature is, the _____ the quality of the receiver
The _____ the equivalent noise temperature is, the _____ the quality of the receiver
Sources of impulse noise induced in communication channels
Sources of impulse noise induced in communication channels
In a communication system, noise is most likely to affect the signal
In a communication system, noise is most likely to affect the signal
Electromagnetic waves produced primarily by heat are called
Electromagnetic waves produced primarily by heat are called
Form of interference caused by rain or dust storms
Form of interference caused by rain or dust storms
Absence of one of the following components in a parametric amplifier renders this circuit a low-noise amplifier
Absence of one of the following components in a parametric amplifier renders this circuit a low-noise amplifier
It is a free running oscillator with a stable frequency of oscillation that depends on a external timing capacitance, timing resistance and control voltage
It is a free running oscillator with a stable frequency of oscillation that depends on a external timing capacitance, timing resistance and control voltage
The transmission of radio waves was first done by:
The transmission of radio waves was first done by:
Amplitude modulation is the process of
Amplitude modulation is the process of
One of the following type of noise becomes of great importance in high frequencies. It is the
One of the following type of noise becomes of great importance in high frequencies. It is the
If bandwidth is doubled, the signal power is
If bandwidth is doubled, the signal power is
_____ sets a limit on the maximum capacity of a channel with a given noise level
_____ sets a limit on the maximum capacity of a channel with a given noise level
Modulation used is to the following except
Modulation used is to the following except
The baseband bandwidth for a voice-grade (telephone) signal is:
The baseband bandwidth for a voice-grade (telephone) signal is:
When dealing with random noise calculation it must be remembered that
When dealing with random noise calculation it must be remembered that
Background noise is the same as the following EXCEPT
Background noise is the same as the following EXCEPT
F1A weighting refers to _____
F1A weighting refers to _____
The most common unit of noise measurement in white noise voltage testing
The most common unit of noise measurement in white noise voltage testing
Power is ____
Power is ____
Signal-to-Noise ratio is calculated as:
Signal-to-Noise ratio is calculated as:
Which of the following is not a source of noise
Which of the following is not a source of noise
______ is the random and unpredictable electric signals from natural causes, both internal and external to the system
______ is the random and unpredictable electric signals from natural causes, both internal and external to the system
Indicate the voltage level in dB with reference to one volt. This unit is used in video or TV measurement
Indicate the voltage level in dB with reference to one volt. This unit is used in video or TV measurement
_____ noise is produced by nonlinear amplification and includes harmonic and intermodulation distortion
_____ noise is produced by nonlinear amplification and includes harmonic and intermodulation distortion
The resolution bandwidth of a spectrum analyzer depends upon
The resolution bandwidth of a spectrum analyzer depends upon
Why does a 5 -kHz square wave require a greater bandwidth than a 2-kHz sinewave
Why does a 5 -kHz square wave require a greater bandwidth than a 2-kHz sinewave
Measuring physical conditions at some remote location and transmitting this data for analysis is the process of
Measuring physical conditions at some remote location and transmitting this data for analysis is the process of
Which standard is utilized in intermodulation noise rates on PCM audio channels?
Which standard is utilized in intermodulation noise rates on PCM audio channels?
Flashcards
What crystal is used in microphones?
What crystal is used in microphones?
Rochelle salt is a piezoelectric crystal commonly used in microphones.
