USCG ETC SWE 2025 questions &
answers rated A+
Hand operated devices including switches, jacks and push buttons shall be located - correct
answer ✔✔At least .3 meters (1 foot) but not more than 1.8 meters (6 feet) above the deck
Radar modulator pulse cables and sonar transducer cables are physically separated at least: -
correct answer ✔✔18 inches from all other cables, except at the point of entrance to the
modulator, transmitter, or transducer.
Radiation that strips electronis is called: - correct answer ✔✔Ionizing radiation
Penetrating ____________ radiation emitted from external sources presents the most difficult
hazard to protect against - correct answer ✔✔Gamma
Microwaves are electromagnetic radiation int he region from: - correct answer ✔✔30 MHz to
300 GHz
Microwaves can be lethal when the power intensity and exposure time are sufficient to cause a
rise in temperature that exceeds an organism's homeostatic capabilities; this occurs when the
temperature rise exceeds: - correct answer ✔✔5 degrees C (9 degrees F)
The use of _____________ with electronic equipment or electronic equipment spaces is strictly
forbidden - correct answer ✔✔steel wool or emery paper or cloth
Nickle cadmium batteries or cells must be charged only in: - correct answer ✔✔series, never in
parallel
,The manual charging rate for a nickel cadmium battery is: - correct answer ✔✔c/10, where "c"
is the ampere hour capacity of the battery.
A completely discharged battery requires _______ hours of charging - correct answer ✔✔14-16
The usual trickle-charge rate is __________ unless the manufacturer recommends otherwise. -
correct answer ✔✔C/100
All contacts, terminals, and like devices having potentials in excess of _________ are clearly
marked "danger high voltage (maximum voltage applicable VOLTS," in addition to having guards
and barriers as specified in the preceding paragraph - correct answer ✔✔500 volts RMS or DC
Onboard naval ships the relative humidity shall not exceed: - correct answer ✔✔55%
____ occurs when a transmitted electromagnetic wave passes through the receiver antenna and
induces a voltage in the antenna - correct answer ✔✔reception
_____ is the ability of the receiver to select a particular frequency of a station from all other
station frequencies appearing at the antenna of the receiver - correct answer ✔✔Selection
______ is the action of separating the low frequency intelligence from the high frequency
carrier. A detector circuit is used to accomplish this action - correct answer ✔✔Detection
_____ is the action of converting the electrical signals to sound waves, which can then be
interpreted by your ears as speech, music, and the like. An example of this might be the stereo
speakers in your car - correct answer ✔✔Reproduction
IRT the Spectrum Analyzer; On the vertical or Y axis, the _____ are plotted - correct answer
✔✔amplitudes
,IRT the Spectrum Analyzer; On the horizontal x axis, the ______ are plotted - correct answer
✔✔Frequencies (time based)
____ is used to connect a small-diameter wire, such as in a lighting fixture, to a large diameter
wire used in a branch circuit. - correct answer ✔✔The fixture joint
To obtain the ____, the cells are connected in series as shown in figure 2-6 - correct answer
✔✔Higher voltage
Rigid waveguides within 1.8 meters (6 feet) of each other should be bonded together through
the entry plate or by means of a crimp type lug fastened under the waveguide flange bolts and
_____. - correct answer ✔✔No 6 AWG wire
Metal underground water pipes typically exhibit a resistance to earth of less than: - correct
answer ✔✔three ohms
What type of grounding is used for lower frequencies, 0-30 kHz up to 300 kHz? - correct answer
✔✔Single Point Ground
Aluminum parts or components should not be cleaned in - correct answer ✔✔high caustic
solutions
Length of time in the ultrasonic cleaner - correct answer ✔✔15 minutes max
A typical ultrasonic cleaning unit is one in which the frequency of the ultrasonic oscillator is
approximately - correct answer ✔✔20,000 hertz
, ____ is used for moving or shifting plates or parts so that corresponding holes will line up -
correct answer ✔✔Aligning punch
The point of this punch is carefully ground to an angle of _____,which is the same as the angel
of a standard twist drill. - correct answer ✔✔60 degrees
Coaxial cables shall be stored in an area when the ambient temperature is less than: - correct
answer ✔✔66* celsius
The minimum bend radius for flexible coaxial cables shall be: - correct answer ✔✔10 times the
cable diameter
The minimum bend radius for flexible coaxial cables when the cable is subject to repeated
flexure is: - correct answer ✔✔20 times the cable diameter
Coaxial cables installed on masts, in the beam pattern of radars operating in the ____ range,
shall be shielded from radiation in accordance with the requirements of MIL-STD-1310 - correct
answer ✔✔200MHz - 450 MHz
IRT multi-conductor cables: the minimum insulation resistance values for these cables shall be: -
correct answer ✔✔50,000 ohms
The three basic types of flexible coaxial cable are: - correct answer ✔✔Single conductor, two
conductor and triaxial
The recommended pressure for semi-rigid semi-air coaxial cables is: - correct answer ✔✔5-10
psi
Coaxial connnectors exposed to the weather, salt spray, moisture and stack gasses shall be
weatherproofed within _______ after assembly - correct answer ✔✔24 Hours
answers rated A+
Hand operated devices including switches, jacks and push buttons shall be located - correct
answer ✔✔At least .3 meters (1 foot) but not more than 1.8 meters (6 feet) above the deck
Radar modulator pulse cables and sonar transducer cables are physically separated at least: -
correct answer ✔✔18 inches from all other cables, except at the point of entrance to the
modulator, transmitter, or transducer.
Radiation that strips electronis is called: - correct answer ✔✔Ionizing radiation
Penetrating ____________ radiation emitted from external sources presents the most difficult
hazard to protect against - correct answer ✔✔Gamma
Microwaves are electromagnetic radiation int he region from: - correct answer ✔✔30 MHz to
300 GHz
Microwaves can be lethal when the power intensity and exposure time are sufficient to cause a
rise in temperature that exceeds an organism's homeostatic capabilities; this occurs when the
temperature rise exceeds: - correct answer ✔✔5 degrees C (9 degrees F)
The use of _____________ with electronic equipment or electronic equipment spaces is strictly
forbidden - correct answer ✔✔steel wool or emery paper or cloth
Nickle cadmium batteries or cells must be charged only in: - correct answer ✔✔series, never in
parallel
,The manual charging rate for a nickel cadmium battery is: - correct answer ✔✔c/10, where "c"
is the ampere hour capacity of the battery.
A completely discharged battery requires _______ hours of charging - correct answer ✔✔14-16
The usual trickle-charge rate is __________ unless the manufacturer recommends otherwise. -
correct answer ✔✔C/100
All contacts, terminals, and like devices having potentials in excess of _________ are clearly
marked "danger high voltage (maximum voltage applicable VOLTS," in addition to having guards
and barriers as specified in the preceding paragraph - correct answer ✔✔500 volts RMS or DC
Onboard naval ships the relative humidity shall not exceed: - correct answer ✔✔55%
____ occurs when a transmitted electromagnetic wave passes through the receiver antenna and
induces a voltage in the antenna - correct answer ✔✔reception
_____ is the ability of the receiver to select a particular frequency of a station from all other
station frequencies appearing at the antenna of the receiver - correct answer ✔✔Selection
______ is the action of separating the low frequency intelligence from the high frequency
carrier. A detector circuit is used to accomplish this action - correct answer ✔✔Detection
_____ is the action of converting the electrical signals to sound waves, which can then be
interpreted by your ears as speech, music, and the like. An example of this might be the stereo
speakers in your car - correct answer ✔✔Reproduction
IRT the Spectrum Analyzer; On the vertical or Y axis, the _____ are plotted - correct answer
✔✔amplitudes
,IRT the Spectrum Analyzer; On the horizontal x axis, the ______ are plotted - correct answer
✔✔Frequencies (time based)
____ is used to connect a small-diameter wire, such as in a lighting fixture, to a large diameter
wire used in a branch circuit. - correct answer ✔✔The fixture joint
To obtain the ____, the cells are connected in series as shown in figure 2-6 - correct answer
✔✔Higher voltage
Rigid waveguides within 1.8 meters (6 feet) of each other should be bonded together through
the entry plate or by means of a crimp type lug fastened under the waveguide flange bolts and
_____. - correct answer ✔✔No 6 AWG wire
Metal underground water pipes typically exhibit a resistance to earth of less than: - correct
answer ✔✔three ohms
What type of grounding is used for lower frequencies, 0-30 kHz up to 300 kHz? - correct answer
✔✔Single Point Ground
Aluminum parts or components should not be cleaned in - correct answer ✔✔high caustic
solutions
Length of time in the ultrasonic cleaner - correct answer ✔✔15 minutes max
A typical ultrasonic cleaning unit is one in which the frequency of the ultrasonic oscillator is
approximately - correct answer ✔✔20,000 hertz
, ____ is used for moving or shifting plates or parts so that corresponding holes will line up -
correct answer ✔✔Aligning punch
The point of this punch is carefully ground to an angle of _____,which is the same as the angel
of a standard twist drill. - correct answer ✔✔60 degrees
Coaxial cables shall be stored in an area when the ambient temperature is less than: - correct
answer ✔✔66* celsius
The minimum bend radius for flexible coaxial cables shall be: - correct answer ✔✔10 times the
cable diameter
The minimum bend radius for flexible coaxial cables when the cable is subject to repeated
flexure is: - correct answer ✔✔20 times the cable diameter
Coaxial cables installed on masts, in the beam pattern of radars operating in the ____ range,
shall be shielded from radiation in accordance with the requirements of MIL-STD-1310 - correct
answer ✔✔200MHz - 450 MHz
IRT multi-conductor cables: the minimum insulation resistance values for these cables shall be: -
correct answer ✔✔50,000 ohms
The three basic types of flexible coaxial cable are: - correct answer ✔✔Single conductor, two
conductor and triaxial
The recommended pressure for semi-rigid semi-air coaxial cables is: - correct answer ✔✔5-10
psi
Coaxial connnectors exposed to the weather, salt spray, moisture and stack gasses shall be
weatherproofed within _______ after assembly - correct answer ✔✔24 Hours
