G5B: The Decibel; current and voltage dividers; electrical power calculations; sine wave root-mean-square (RMS) values; PEP calculations
G5B01:
A two-times increase or decrease in power results in a change of how many dB?
3 dB
2 dB
6 dB
12 dB
G5B02:
How does the total current relate to the individual currents in each branch of a 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
G5B03:
How many watts of electrical power are used if 400 VDC is supplied to an 800-ohm load?
200 watts
0.5 watts
400 watts
3200 watts
G5B04:
How many watts of electrical power are used by a 12-VDC light bulb that draws 0.2 amperes?
2.4 watts
24 watts
6 watts
60 watts
G5B05:
How many watts are being dissipated when a current of 7.0 milliamperes flows through 1.25 kilohms?
Approximately 61 milliwatts
Approximately 39 milliwatts
Approximately 11 milliwatts
Approximately 9 milliwatts
G5B06:
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?
100 watts
1.4 watts
353.5 watts
400 watts
G5B07:
Which measurement of an AC signal is equivalent to a DC voltage of the same value?
The RMS value
The peak-to-peak value
The peak value
The reciprocal of the RMS value
G5B08:
What is the peak-to-peak voltage of a sine wave that has an RMS voltage of 120 volts?
339.4 volts
84.8 volts
169.7 volts
240.0 volts
G5B09:
What is the RMS voltage of sine wave with a value of 17 volts peak?
12 volts
8.5 volts
24 volts
34 volts
G5B11:
What is the ratio of peak envelope power to average power for an unmodulated carrier?
1.00
.707
1.414
2.00
G5B12:
What would be the voltage across a 50-ohm dummy load dissipating 1200 watts?
245 volts
173 volts
346 volts
692 volts
G5B13:
What percentage of power loss would result from a transmission line loss of 1 dB?
20.5 %
10.9 %
12.2 %
25.9 %
G5B14:
What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50-ohm resistor connected to the transmitter output?
625 watts
8.75 watts
2500 watts
5000 watts
G5B15:
What is the output PEP of an unmodulated carrier if an average reading wattmeter connected to the transmitter output indicates 1060 watts?
1060 watts
530 watts
1500 watts
2120 watts
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