GROL Element 3: Complete Study Guide and Practice Questions for General Radiotelephone Operator License
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GROL Element 3
GROL Element 3: Complete Study
Guide and Practice Questions for
General Radiotelephone Operator
License
The product of the readings of an AC voltmeter and AC ammeter is called:
Apparent power
What is the term used to express the amount electrical energy stored in an
electrostatic field?
Jou...
GROL Element 3: Complete Study
Guide and Practice Questions for
General Radiotelephone Operator
License
The product of the readings of an AC voltmeter and AC ammeter is called:
Apparent power
What is the term used to express the amount electrical energy stored in an
electrostatic field?
Joules
What formula would determine the inductive reactance of a coil if frequency and
coil inductance is known?
Xl=2pi(fL)
What determines the strength of a magnetic field around a conductor?
The amount of current
What will produce a magnetic field?
A current flowing through a conductor.
When induced currents produce expanding magnetic fields around conductors in
a direction that opposes the original magnetic field, this is known as:
Lenz's law
,Permeability is defined as?
The ratio of magnetic flux density in a substance to the magnetizing force that
produces it.
What metal is usually employed as a sacrificial anode for corrosion control
purposes?
Zinc bar
Which metal object may be least affected by galvanic corrosion when submerged
in seawater?
Stainless steel propeller shaft
Skin effect is the phenomenon where:
RF current flows in a thin layer of the conductor, closer to the surface, as
frequency increases.
Which of these will be most useful for insulation at UHF frequencies?
Mica
What formula would calculate the total inductance of inductors in series?
Lt=L1+L2
Which of the 4 group of metals are the best low-resistance conductors?
Gold, silver, copper
What is the purpose of a bypass capacitor?
It removes the alternating current by providing a low impedance path to ground.
What are the two most commonly-used specifications for a junction diode?
,Maximum forward current and peak inverse voltage (PIV)
MOSFETs are manufactured with this protective device built into their gate to
protect the device from static charges and excessive voltages:
Zenner diode
What are the two basic types of junction field-effect transistors?
N-channel and P channel
By what factor must the voltage of an AC circuit, as indicated on the scale of an
AC voltmeter, be multiplied to obtain the peak voltage value?
1.414
What is the easiest voltage amplitude to measure by viewing a pure sine wave
signal on an oscilloscope?
Peak-to-peak
What is the peak voltage at a common household electrical outlet?
165.5 volts
What is a sine wave?
A wave whose amplitude at any given instant can be represented by the
projection of a point on a wheel rotating at a uniform speed.
What type of wave is made up of sine waves of a fundamental frequency and all
the odd frequencies?
Square wave
, What type of wave is characterized by a rise time significantly faster then the fall
time?
Sawtooth wave
What is the term used to identify an AC voltage that would cause the same
heating in a resistor as a corresponding value of DC voltage?
Root mean square (RMS)
What happens to reactive power in a circuit that haw both inductors and
capacitors?
It alternates between magnetic and electric fields and is not dissipated
Halving the cross-sectional area of a conductor will?
Double the resistance
Which of the following Ohms Law formulas is incorrect
E=IxR
If a current of 2 amperes flows through a 50-ohm resistor, what is the voltage
across the resistor?
100 volts. Amps x Ohms = Volts
A relay coil has 500 ohms resistance, and operates on 125 mA. What value of
resistance should be connected in series with it to operate from 110 V DC?
380 ohms. 1step- V/I=R <=> 880-500=380
What is the peak-to-peak RF voltage on the 50 ohms output of a 100 watt
transmitter?
200 volts. E=√(PxR) <=> 70.71v RMS <=> 100v one peak x 2 = 200v
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