2015-G5B: The Decibel; current and voltage dividers; electrical power calculations; sine wave root-mean-square (RMS) values; PEP calculations
What dB change represents a two-times increase or decrease in power?
Approximately 3 dB
Approximately 2 dB
Approximately 6 dB
Approximately 12 dB
How does the total current relate to the individual currents in each branch of a purely resistive parallel circuit?
It equals the sum of the currents through each branch
It equals the average of each branch current
It decreases as more parallel branches are added to the circuit
It is the sum of the reciprocal of each individual voltage drop
How many watts of electrical power are used if 400 VDC is supplied to an 800 ohm load?
How many watts of electrical power are used by a 12 VDC light bulb that draws 0.2 amperes?
How many watts are dissipated when a current of 7.0 milliamperes flows through 1.25 kilohms resistance?
Approximately 61 milliwatts
Approximately 61 watts
Approximately 11 milliwatts
Approximately 11 watts
What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output?
What value of an AC signal produces the same power dissipation in a resistor as a DC voltage of the same value?
The RMS value
The peak-to-peak value
The peak value
The reciprocal of the RMS value
What is the RMS voltage of a sine wave with a value of 17 volts peak?
What percentage of power loss would result from a transmission line loss of 1 dB?
What is the ratio of peak envelope power to average power for an unmodulated carrier?
What would be the RMS voltage across a 50 ohm dummy load dissipating 1200 watts?
What is the output PEP of an unmodulated carrier if an average reading wattmeter connected to the transmitter output indicates 1060 watts?
What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50 ohm resistive load connected to the transmitter output?
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