ASU IFT 372 Fall 2018 Helm Weeks 1-7 Quizzes + Midterm Multisource
What is a logarithm?
Correct answer: A logarithm is an exponent based mathematical representation of a numerical value.
What logarithmic base is used
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ASU IFT 372 Fall 2018 Helm Weeks 1-7 Quizzes + Midterm Multisource
What is a logarithm?
Correct answer: A logarithm is an exponent based mathematical representation of a numerical value.
What logarithmic base is used in digital communications?
Correct answer: Two
How do you find a log2 value on a calculator that only has log10 functionality? (Hint: what is the
formula?)
Correct answer: log2(a) = [log10(a) / log10(2)]
What is the definition of a decibel?
Correct answer: a = 10lob(b), where a is the decibel value and b is the decimal value
Correct answer: A decibel is a mathematical representation of a power level on a logarithmic scale.
You cannot mix decimal and decibel values in an equation (i.e., you either have to work with decimal
values or decibel values)
Correct answer: True
There can be more than one power value in a decibel (dB) equation.
Correct answer: False
When you add two decibel values, you are multiplying those values in decimal (I.e. 3 dB + 6 dB = 9 dB
which is equivalent to 2 * 4 = 8 in decimal)
Correct answer: True
__________ is a decibel value referenced to watts and ______ is a decibel value referenced to milliwatts.
Correct answer: dBW & dBm
How do you convert dBW to dBm?
Correct answer: Add 30 dB to dBW to obtain dBm value
The net gain or (loss) of a transmission system is a radio between the _________ __________ and
____________ ____________ where the ___________ is the numerator and the ___________
____________ is the denominator.
Correct answer: Output power & Input power
What parameter of the intelligent signal causes or determines the instantaneous rate of carrier
frequency?
Correct answer: Amplitude of the modulating signal
What parameter of the intelligent signal causes frequency deviation of the carrier?
Correct answer: Amplitude of the modulating signal
Determine the noise power (in dBm) at 27° C in a 500 kHz bandwidth.
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