GROL EXAM 2025/2026 QUESTIONS AND
ANSWERS 100% PASS
What device is used to store electrical energy in an electrostatic field? - ANS capacitor
What is the basic unit of electrical power? - ANS Watt
What will produce a magnetic field? - ANS A current flowing through a conductor.
Which metal object may be least affected by galvanic corrosion when submerged in seawater -
ANS Stainless steel propeller shaft.
What is the relative dielectric constant of air? - ANS 1
What formula would calculate the total inductance of inductors in a series? - ANS LT = L1 +
L2
Good conductors with minimum resistance have what type of electrons - ANS Many free
electrons
MOSFETs are manufactured with THIS protective device built into their gate to protect the
device from static charges and excessive voltages: - ANS Zener diode
1 @COPYRIGHT 2025/2026
,What limits the maximum forward current in a junction diode - ANS The junction
temperature.
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 - ANS 1.414
What type of wave is characterized by a rise time significantly faster than the fall time -
ANS Sawtooth wave
How many degrees are there in one complete sine wave cycle - ANS 360 degrees
Which of the following groups is correct for listing common materials in order of descending
conductivity? - ANS A. Silver, copper, aluminum, iron, and lead. (SCAIL)
What happens to reactive power in a circuit that has both inductors and capacitors - ANS It
alternates between magnetic and electric fields and is not dissipated.
Which of the following ohms law formulas is incorrect - ANS I=R/E
If a current of 3 amperes flows through a resistor connected to 90 volts, what is the resistance?
- ANS 30 ohms
What is the maximum DC or RMS voltage that may be connected across a 20 Watt, 2000 ohm
resistor - ANS 200 volts
In Figure 3B1, what is the voltage drop across R1? - ANS 5 volts
The second harmonic of a 380 kHz frequency is - ANS 760 kHz
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,What is the most the actual transmitter frequency could differ from a reading of 156,520,000
Hertz on a frequency counter with A time base accuracy of +/- 10 ppm - ANS 1565.20 Hz.
At 150 degrees, what is the amplitude of a sine-wave having a peak value of 5 volts? -
ANS +2.5 volts.
What is the RMS value of a 340-volt peak-to-peak pure sine wave? - ANS 120 volts AC
If a resistance to which a constant voltage is applied is halved, what power dissipation will
result? - ANS double
After two time constants, the capacitor in an RC circuit is discharged to what percentage of the
starting voltage? - ANS 13.5%
What is the meaning of the term " time constant of an RC circuit"? the time required to change
the capacitor in the circuit to - ANS 63.2%
What is the time constant of a circuit having a 220-microfarad, capacitor, and a 1-megohm
resistor in parallel - ANS 220 seconds.
What is the time constant of a circuit having two 100-microfarad capacitors and two 470-
kilohm resistors all in series - ANS 47 seconds
In rectangular coordinates, what is the impedance of a network composed of a .01 microHenry
inductor in series with a 30-ohm resistor, 5 MHz - ANS 30 +j3
In polar coordinates, what is the impedance of a network composed of a 300-ohm-reactants
capacitor, a 600-ohm-reactants inductor, and a 400- ohm resistor, all connected in series -
ANS 500 ohms, / 37 degrees
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, In polar coordinates, what is the impedance of a network composed of a 100-ohm-reactants
inductor in series with a 100 ohm resistor - ANS 141 ohms, / 45 degrees
What is the magnitude of the impedance of a series AC circuit, having the resistance of 6 ohms,
an inductive reactance of 17 ohms, and zero capacitive reactance - ANS 18 ohms
A 1-watt, 10-volt Zener diode with the following characteristics: Imin = 5mA; Imax = 95 mA; and
Z = 8 ohms, is to be used as part of a voltage regulator in 20-V power supply l. Approximately
what size current-limiting resistor would be used to set its bias to midpoint of its operating
range?
A. 100 ohms
B. 200 ohms
C. 1 kilohms
D. 2 kilohms - ANS B. 200 ohms.
What is the photoconductive effect? - ANS The increased conductivity of an illuminated
semiconductor junction.
What is the description of an optoisolator? - ANS An LED and a photosensitive device.
In Figure 3C4, if a small variable capacitor were installed in place of the dashed line, it would?
A. Increase gain
B. Increase parasitic oscillations
C. Decrease parasitic oscillations
D. Decrease crosstalk - ANS C. Decrease parasitic oscillations.
4 @COPYRIGHT 2025/2026
ANSWERS 100% PASS
What device is used to store electrical energy in an electrostatic field? - ANS capacitor
What is the basic unit of electrical power? - ANS Watt
What will produce a magnetic field? - ANS A current flowing through a conductor.
Which metal object may be least affected by galvanic corrosion when submerged in seawater -
ANS Stainless steel propeller shaft.
What is the relative dielectric constant of air? - ANS 1
What formula would calculate the total inductance of inductors in a series? - ANS LT = L1 +
L2
Good conductors with minimum resistance have what type of electrons - ANS Many free
electrons
MOSFETs are manufactured with THIS protective device built into their gate to protect the
device from static charges and excessive voltages: - ANS Zener diode
1 @COPYRIGHT 2025/2026
,What limits the maximum forward current in a junction diode - ANS The junction
temperature.
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 - ANS 1.414
What type of wave is characterized by a rise time significantly faster than the fall time -
ANS Sawtooth wave
How many degrees are there in one complete sine wave cycle - ANS 360 degrees
Which of the following groups is correct for listing common materials in order of descending
conductivity? - ANS A. Silver, copper, aluminum, iron, and lead. (SCAIL)
What happens to reactive power in a circuit that has both inductors and capacitors - ANS It
alternates between magnetic and electric fields and is not dissipated.
Which of the following ohms law formulas is incorrect - ANS I=R/E
If a current of 3 amperes flows through a resistor connected to 90 volts, what is the resistance?
- ANS 30 ohms
What is the maximum DC or RMS voltage that may be connected across a 20 Watt, 2000 ohm
resistor - ANS 200 volts
In Figure 3B1, what is the voltage drop across R1? - ANS 5 volts
The second harmonic of a 380 kHz frequency is - ANS 760 kHz
2 @COPYRIGHT 2025/2026
,What is the most the actual transmitter frequency could differ from a reading of 156,520,000
Hertz on a frequency counter with A time base accuracy of +/- 10 ppm - ANS 1565.20 Hz.
At 150 degrees, what is the amplitude of a sine-wave having a peak value of 5 volts? -
ANS +2.5 volts.
What is the RMS value of a 340-volt peak-to-peak pure sine wave? - ANS 120 volts AC
If a resistance to which a constant voltage is applied is halved, what power dissipation will
result? - ANS double
After two time constants, the capacitor in an RC circuit is discharged to what percentage of the
starting voltage? - ANS 13.5%
What is the meaning of the term " time constant of an RC circuit"? the time required to change
the capacitor in the circuit to - ANS 63.2%
What is the time constant of a circuit having a 220-microfarad, capacitor, and a 1-megohm
resistor in parallel - ANS 220 seconds.
What is the time constant of a circuit having two 100-microfarad capacitors and two 470-
kilohm resistors all in series - ANS 47 seconds
In rectangular coordinates, what is the impedance of a network composed of a .01 microHenry
inductor in series with a 30-ohm resistor, 5 MHz - ANS 30 +j3
In polar coordinates, what is the impedance of a network composed of a 300-ohm-reactants
capacitor, a 600-ohm-reactants inductor, and a 400- ohm resistor, all connected in series -
ANS 500 ohms, / 37 degrees
3 @COPYRIGHT 2025/2026
, In polar coordinates, what is the impedance of a network composed of a 100-ohm-reactants
inductor in series with a 100 ohm resistor - ANS 141 ohms, / 45 degrees
What is the magnitude of the impedance of a series AC circuit, having the resistance of 6 ohms,
an inductive reactance of 17 ohms, and zero capacitive reactance - ANS 18 ohms
A 1-watt, 10-volt Zener diode with the following characteristics: Imin = 5mA; Imax = 95 mA; and
Z = 8 ohms, is to be used as part of a voltage regulator in 20-V power supply l. Approximately
what size current-limiting resistor would be used to set its bias to midpoint of its operating
range?
A. 100 ohms
B. 200 ohms
C. 1 kilohms
D. 2 kilohms - ANS B. 200 ohms.
What is the photoconductive effect? - ANS The increased conductivity of an illuminated
semiconductor junction.
What is the description of an optoisolator? - ANS An LED and a photosensitive device.
In Figure 3C4, if a small variable capacitor were installed in place of the dashed line, it would?
A. Increase gain
B. Increase parasitic oscillations
C. Decrease parasitic oscillations
D. Decrease crosstalk - ANS C. Decrease parasitic oscillations.
4 @COPYRIGHT 2025/2026
