E8D: Waves, measurements, and RF grounding: peak-to-peak values, polarization; RF grounding
E8D01:
What is the easiest voltage amplitude parameter to measure when viewing a pure sine wave signal on an oscilloscope?
Peak-to-peak voltage
RMS voltage
Average voltage
DC voltage
E8D02:
What is the relationship between the peak-to-peak voltage and the peak voltage amplitude of a symmetrical waveform?
2:1
0.707:1
1.414:1
4:1
E8D03:
What input-amplitude parameter is valuable in evaluating the signal-handling capability of a Class A amplifier?
Peak voltage
RMS voltage
Average power
Resting voltage
E8D04:
What is the PEP output of a transmitter that has a maximum peak of 30 volts to a 50-ohm load as observed on an oscilloscope?
9 watts
4.5 watts
16 watts
18 watts
E8D05:
If an RMS-reading AC voltmeter reads 65 volts on a sinusoidal waveform, what is the peak-to-peak voltage?
184 volts
46 volts
92 volts
130 volts
E8D06:
What is the advantage of using a peak-reading wattmeter to monitor the output of a SSB phone transmitter?
It gives a more accurate display of the PEP output when modulation is present
It is easier to determine the correct tuning of the output circuit
It makes it easier to detect high SWR on the feed-line
It can determine if any "flat-topping" is present during modulation peaks
E8D07:
What is an electromagnetic wave?
A wave consisting of an electric field and a magnetic field oscillating at right angles to each other
Alternating currents in the core of an electromagnet
A wave consisting of two electric fields at right angles to each other
A wave consisting of two magnetic fields at right angles to each other
E8D08:
Which of the following best describes electromagnetic waves traveling in free space?
Changing electric and magnetic fields propagate the energy
Electric and magnetic fields become aligned as they travel
The energy propagates through a medium with a high refractive index
The waves are reflected by the ionosphere and return to their source
E8D09:
What is meant by circularly polarized electromagnetic waves?
Waves with a rotating electric field
Waves with an electric field bent into a circular shape
Waves that circle the Earth
Waves produced by a loop antenna
E8D10:
What is the polarization of an electromagnetic wave if its magnetic field is parallel to the surface of the Earth?
Vertical
Circular
Horizontal
Elliptical
E8D11:
What is the polarization of an electromagnetic wave if its magnetic field is perpendicular to the surface of the Earth?
Horizontal
Circular
Elliptical
Vertical
E8D12:
At approximately what speed do electromagnetic waves travel in free space?
300 million meters per second
186,300 meters per second
186,300 feet per second
300 million miles per second
E8D13:
What type of meter should be used to monitor the output signal of a voice-modulated single-sideband transmitter to ensure you do not exceed the maximum allowable power?
A peak-reading wattmeter
An SWR meter reading in the forward direction
A modulation meter
An average reading wattmeter
E8D14:
What is the average power dissipated by a 50-ohm resistive load during one complete RF cycle having a peak voltage of 35 volts?
12.2 watts
9.9 watts
24.5 watts
16 watts
E8D15:
If an RMS reading voltmeter reads 34 volts on a sinusoidal waveform, what is the peak voltage?
48 volts
123 volts
96 volts
55 volts
E8D16:
Which of the following is a typical value for the peak voltage at a common household electrical outlet?
170 volts
240 volts
120 volts
340 volts
E8D17:
Which of the following is a typical value for the peak-to-peak voltage at a common household electrical outlet?
340 volts
240 volts
120 volts
170 volts
E8D18:
Which of the following is a typical value for the RMS voltage at a common household electrical power outlet?
120-V AC
340-V AC
85-V AC
170-V AC
E8D19:
What is the RMS value of a 340-volt peak-to-peak pure sine wave?
120-V AC
170-V AC
240-V AC
300-V AC
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