Chapter 2 - Electronic Fundamentals for Communications Exam Questions With Correct Answers
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Course
Electronic Fundamentals
Institution
Electronic Fundamentals
Chapter 2 - Electronic Fundamentals for
Communications Exam Questions With
Correct Answers
What is Gain? and what's it's ration - answerGain means amplification.
Output/Inside
How do you calculate the total gain of cascaded gains? - answerThey are multiplied by one
another.
What is Attenuati...
Chapter 2 - Electronic Fundamentals for
Communications Exam Questions With
Correct Answers
What is Gain? and what's it's ration - answer✔Gain means amplification.
Output/Inside
How do you calculate the total gain of cascaded gains? - answer✔They are multiplied by one
another.
What is Attenuation? - answer✔Attenuation refers to a loss introduced by a circuit or
component.
How do you calculate the total gain of a cascaded circuit? - answer✔Each circuit gain is
multiplied by the next.
How do you calculate the attenuation factor of a cascaded circuit? - answer✔Each circuit loss is
multiplied by the next.
It is not common in communication systems and equipment to cascade circuits and components
that have gain and attenuation.
True or False - answer✔False
What are Decibels? - answer✔The gain or loss of a circuit is usually expressed in decibels (dB),
____ was a unit of measurement that was originally created as a way of expressing the hearing
response of the human ear to various sound levels. - answer✔Decibel
What is 1/10 a decebel? - answer✔A bel
What is the formula for calculating Decibel gains or losses for Voltage and Current? -
answer✔20 * log10 (Vo / Vin)
What is the formula for calculating Decibel gains or losses for Power? - answer✔10 * log10
(Po / Pin)
How do you calculate the overall decibel gain or attenuation of a circuit or system -
answer✔You simply add the decibel gain and attenuation factors of each circuit
Ratios less than 1 give negative decibel values
True or False? - answer✔True
Does a 2:1 ratio represents a 3-dB power gain or a 6-dB voltage gain.
True or False - answer✔True
Why is expressing gain or attenuation in decibels not always a very good idea? - answer✔When
the ratio is computed, the units of voltage or power are canceled, making the ratio a
dimensionless, or relative, figure. When you see a decibel value, you really do not know the
actual voltage or power values.
The least perceptible sound (hearing threshold) - answer✔0 dB
The Intensity of a Normal Conversation? - answer✔65 dB
The pain threshold of sound. - answer✔120 dB
What is dBm? - answer✔It is a reference value used to compare any other value when
calculating gain or attenuation. Usually When a decibel value is computed by comparing a power
value to 1 mW
How do you calculate dBm? - answer✔10 * log10 (Po / 0.001) in Watts
What are Tuned Circuits made up of? - answer✔Circuits made up of inductors and capacitors
that resonate at specific frequencies.
What is Reactance? - answer✔Reactance is an opposition that directly affects the amount of
current in a circuit.
Reactive components do not produce a phase shift between the currents and voltages in a circuit.
True or False - answer✔False
Capacitance causes the current to lead the applied voltage
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