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GROL exam Questions and Answers (100% Correct Answers) | Latest
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
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
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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
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.
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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
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
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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.
GROL exam Questions and Answers (100% Correct Answers) | Latest
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
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
,2 for specific request mail
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
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.
,3 for specific request mail
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
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
, 4 for specific request mail
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.
