GROL Exam UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
What device is used to store electrical energy in an electrostatic field? - CORRECT
ANSWER capacitor
What is the basic unit of electrical power? - CORRECT ANSWER Watt
What will produce a magnetic field? - CORRECT ANSWER A current flowing
through a conductor.
Which metal object may be least affected by galvanic corrosion when submerged in seawater
- CORRECT ANSWER Stainless steel propeller shaft.
What is the relative dielectric constant of air? - CORRECT ANSWER 1
What formula would calculate the total inductance of inductors in a series? - CORRECT
ANSWER LT = L1 + L2
Good conductors with minimum resistance have what type of electrons - CORRECT
ANSWER Many free electrons
MOSFETs are manufactured with THIS protective device built into their gate to protect the
device from static charges and excessive voltages: - CORRECT ANSWER Zener diode
What limits the maximum forward current in a junction diode - CORRECT
ANSWER 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 - CORRECT ANSWER 1.414
,What type of wave is characterized by a rise time significantly faster than the fall time -
CORRECT ANSWER Sawtooth wave
How many degrees are there in one complete sine wave cycle - CORRECT
ANSWER 360 degrees
Which of the following groups is correct for listing common materials in order of descending
conductivity? - CORRECT ANSWER A. Silver, copper, aluminum, iron, and lead.
(SCAIL)
What happens to reactive power in a circuit that has both inductors and capacitors -
CORRECT ANSWER It alternates between magnetic and electric fields and is not
dissipated.
Which of the following ohms law formulas is incorrect - CORRECT ANSWER I=R/
E
If a current of 3 amperes flows through a resistor connected to 90 volts, what is the
resistance? - CORRECT ANSWER 30 ohms
What is the maximum DC or RMS voltage that may be connected across a 20 Watt, 2000
ohm resistor - CORRECT ANSWER 200 volts
In Figure 3B1, what is the voltage drop across R1? - CORRECT ANSWER 5 volts
The second harmonic of a 380 kHz frequency is - CORRECT ANSWER 760 kHz
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 - CORRECT
ANSWER 1565.20 Hz.
,At 150 degrees, what is the amplitude of a sine-wave having a peak value of 5 volts? -
CORRECT ANSWER +2.5 volts.
What is the RMS value of a 340-volt peak-to-peak pure sine wave? - CORRECT
ANSWER 120 volts AC
If a resistance to which a constant voltage is applied is halved, what power dissipation will
result? - CORRECT ANSWER double
After two time constants, the capacitor in an RC circuit is discharged to what percentage of
the starting voltage? - CORRECT ANSWER 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 - CORRECT ANSWER 63.2%
What is the time constant of a circuit having a 220-microfarad, capacitor, and a 1-megohm
resistor in parallel - CORRECT ANSWER 220 seconds.
What is the time constant of a circuit having two 100-microfarad capacitors and two 470-
kilohm resistors all in series - CORRECT ANSWER 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 - CORRECT
ANSWER 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 -
CORRECT ANSWER 500 ohms, / 37 degrees
In polar coordinates, what is the impedance of a network composed of a 100-ohm-reactants
inductor in series with a 100 ohm resistor - CORRECT ANSWER 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 - CORRECT
ANSWER 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 - CORRECT ANSWER B. 200 ohms.
What is the photoconductive effect? - CORRECT ANSWER The increased
conductivity of an illuminated semiconductor junction.
What is the description of an optoisolator? - CORRECT ANSWER 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 - CORRECT ANSWER C. Decrease parasitic oscillations.
What factors determine the capacitance of a capacitor? - CORRECT
ANSWER Distance between the plates and the dielectric constant of the material
between the plates.
QUESTIONS AND CORRECT ANSWERS
What device is used to store electrical energy in an electrostatic field? - CORRECT
ANSWER capacitor
What is the basic unit of electrical power? - CORRECT ANSWER Watt
What will produce a magnetic field? - CORRECT ANSWER A current flowing
through a conductor.
Which metal object may be least affected by galvanic corrosion when submerged in seawater
- CORRECT ANSWER Stainless steel propeller shaft.
What is the relative dielectric constant of air? - CORRECT ANSWER 1
What formula would calculate the total inductance of inductors in a series? - CORRECT
ANSWER LT = L1 + L2
Good conductors with minimum resistance have what type of electrons - CORRECT
ANSWER Many free electrons
MOSFETs are manufactured with THIS protective device built into their gate to protect the
device from static charges and excessive voltages: - CORRECT ANSWER Zener diode
What limits the maximum forward current in a junction diode - CORRECT
ANSWER 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 - CORRECT ANSWER 1.414
,What type of wave is characterized by a rise time significantly faster than the fall time -
CORRECT ANSWER Sawtooth wave
How many degrees are there in one complete sine wave cycle - CORRECT
ANSWER 360 degrees
Which of the following groups is correct for listing common materials in order of descending
conductivity? - CORRECT ANSWER A. Silver, copper, aluminum, iron, and lead.
(SCAIL)
What happens to reactive power in a circuit that has both inductors and capacitors -
CORRECT ANSWER It alternates between magnetic and electric fields and is not
dissipated.
Which of the following ohms law formulas is incorrect - CORRECT ANSWER I=R/
E
If a current of 3 amperes flows through a resistor connected to 90 volts, what is the
resistance? - CORRECT ANSWER 30 ohms
What is the maximum DC or RMS voltage that may be connected across a 20 Watt, 2000
ohm resistor - CORRECT ANSWER 200 volts
In Figure 3B1, what is the voltage drop across R1? - CORRECT ANSWER 5 volts
The second harmonic of a 380 kHz frequency is - CORRECT ANSWER 760 kHz
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 - CORRECT
ANSWER 1565.20 Hz.
,At 150 degrees, what is the amplitude of a sine-wave having a peak value of 5 volts? -
CORRECT ANSWER +2.5 volts.
What is the RMS value of a 340-volt peak-to-peak pure sine wave? - CORRECT
ANSWER 120 volts AC
If a resistance to which a constant voltage is applied is halved, what power dissipation will
result? - CORRECT ANSWER double
After two time constants, the capacitor in an RC circuit is discharged to what percentage of
the starting voltage? - CORRECT ANSWER 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 - CORRECT ANSWER 63.2%
What is the time constant of a circuit having a 220-microfarad, capacitor, and a 1-megohm
resistor in parallel - CORRECT ANSWER 220 seconds.
What is the time constant of a circuit having two 100-microfarad capacitors and two 470-
kilohm resistors all in series - CORRECT ANSWER 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 - CORRECT
ANSWER 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 -
CORRECT ANSWER 500 ohms, / 37 degrees
In polar coordinates, what is the impedance of a network composed of a 100-ohm-reactants
inductor in series with a 100 ohm resistor - CORRECT ANSWER 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 - CORRECT
ANSWER 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 - CORRECT ANSWER B. 200 ohms.
What is the photoconductive effect? - CORRECT ANSWER The increased
conductivity of an illuminated semiconductor junction.
What is the description of an optoisolator? - CORRECT ANSWER 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 - CORRECT ANSWER C. Decrease parasitic oscillations.
What factors determine the capacitance of a capacitor? - CORRECT
ANSWER Distance between the plates and the dielectric constant of the material
between the plates.
