CDC 2e151 Vol 1 Swats Journeyman
This is a mix of self test and made up questions from the text.
- 1.
X-rays contain what percent of the initial nuclear explosion energy?
- A.
80%
- B.
70%
- C.
60%
- D.
90%
- E.
50%
Correct Answer
A. 80%Explanation
X-rays contain 80% of the initial nuclear explosion energy. This means that when a nuclear explosion occurs, 80% of the total energy released is in the form of X-rays. X-rays are a type of electromagnetic radiation with high energy and short wavelengths. They are produced when high-energy particles or photons collide with atoms, causing the atoms to emit X-ray photons. In the context of a nuclear explosion, the release of X-rays is a significant component of the overall energy release.Rate this question:
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- 2.
What are the Derived nuclear environments?
- A.
Airblast and shock, thermal radiation, EMP, Atmospheric disturbances, and transient radiation.
- B.
Airblast and shock
- C.
EMP, Atmospheric disturbances, and transient radiation.
- D.
Airblast and shock, and thermal radiation.
- E.
Thermal radiation, EMP, Atmospheric disturbances, and transient radiation.
Correct Answer
A. Airblast and shock, thermal radiation, EMP, Atmospheric disturbances, and transient radiation.Explanation
The correct answer includes all the derived nuclear environments, which are airblast and shock, thermal radiation, electromagnetic pulse (EMP), atmospheric disturbances, and transient radiation. These are the various effects that occur after a nuclear explosion and can have significant impacts on the surrounding environment and infrastructure.Rate this question:
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- 3.
What primary nuclear enviornment elements do we call indirectly ionizing radiation?
- A.
X-ray, Neutrons, and Gamma rays
- B.
Neutrons, and Gamma rays
- C.
Gamma rays and Thermal Radiation
- D.
Thermal Radiation, Neutrons, and Gamma rays
Correct Answer
A. X-ray, Neutrons, and Gamma raysExplanation
X-ray, Neutrons, and Gamma rays are considered indirectly ionizing radiation because they do not directly ionize atoms or molecules in the material they pass through. Instead, they transfer their energy to other particles or atoms, which then ionize the surrounding atoms or molecules. This process is known as indirect ionization.Rate this question:
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- 4.
What element contains 50% of the derived enviornment energy?
- A.
Airblast and shock
- B.
Thermal radiation
- C.
Atmospheric disturbances
- D.
Transient radiation
- E.
EMP
Correct Answer
A. Airblast and shockExplanation
Airblast and shock contain 50% of the derived environment energy. This refers to the energy generated by explosive events, such as explosions or blasts. Airblast refers to the shockwave created by the sudden release of energy, while shock refers to the impact or vibration caused by the blast. Together, these elements account for half of the energy released in the derived environment.Rate this question:
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- 5.
When does the source of radiation occur that causes skin burns, fire, flash blindness, and retinal burns?
- A.
Thermal radiation, second pulse
- B.
Thermal radiation, first pulse
- C.
Transient radiation, second pulse
- D.
Atmospheric disturbances, first pulse
- E.
Transient radiation, first pulse
Correct Answer
A. Thermal radiation, second pulseExplanation
Thermal radiation occurs during the second pulse and is the source of radiation that causes skin burns, fire, flash blindness, and retinal burns.Rate this question:
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- 6.
What are the two distinct regions of importance for SREMP?
- A.
Source and Radiated
- B.
Primary and Derived
- C.
Source and Derived
- D.
Primary and Radiated
Correct Answer
A. Source and RadiatedExplanation
SREMP stands for Site Response Earthquake Motion Parameters, which is a measure of how the ground motion from an earthquake is amplified or attenuated at a particular site. The two distinct regions of importance for SREMP are the source region, which refers to the area where the earthquake originates, and the radiated region, which refers to the area where the ground motion is propagated and recorded. These two regions are crucial in understanding and analyzing the characteristics of earthquake ground motion at a specific site.Rate this question:
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- 7.
What is the central issue today concerning EMP?
- A.
Protection
- B.
Avoidance
- C.
Repair
- D.
Shielding
Correct Answer
A. ProtectionExplanation
The central issue today concerning EMP is protection. EMP, or electromagnetic pulse, is a burst of electromagnetic radiation that can disrupt or damage electronic devices and systems. With the increasing reliance on technology in various sectors, protecting these systems from the potentially devastating effects of EMP has become a crucial concern. This involves implementing measures such as shielding, grounding, and surge protection to ensure the resilience and functionality of electronic equipment in the face of EMP threats.Rate this question:
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- 8.
What type of EMI occurs when an unwanted carrier frequency follows the normal signal path through the effected receiver?
- A.
Co-Channel
- B.
Adjacent signal
- C.
Spurious responses
- D.
Spurious emissions
Correct Answer
A. Co-ChannelExplanation
When an unwanted carrier frequency follows the normal signal path through the affected receiver, it causes Co-Channel EMI. In this type of EMI, multiple signals are transmitted on the same frequency channel, leading to interference and degradation of the desired signal. Co-Channel interference can occur when two or more transmitters are operating on the same frequency in close proximity, causing overlapping signals and resulting in poor signal quality and reduced communication efficiency.Rate this question:
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- 9.
What type of intermodulation can have a very large bandwidth and cause more severe interference problems than intermodulation products created in either transmitters or receivers?
- A.
Co-channel
- B.
Brute force
- C.
Spurious response
- D.
Rusty bolt
Correct Answer
D. Rusty boltExplanation
A rusty bolt can cause a type of intermodulation that has a very large bandwidth and can cause more severe interference problems than intermodulation products created in either transmitters or receivers. This is because the rust on the bolt can introduce additional frequencies and harmonics into the system, leading to a wider range of interference. Additionally, the corrosion on the bolt can degrade the overall performance of the system, further exacerbating the interference issues.Rate this question:
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- 10.
What type of EMI occurs when high level radiated signals penetrate and induce a radio frequency voltage in the internal circuits of a system or equipment?
- A.
Brute force
- B.
Co-channel
- C.
Rusty bolt
- D.
Spurious reponses
Correct Answer
A. Brute force -
- 11.
How soon must you file a report once you confirm an EMI problem exists?
- A.
24 hours
- B.
48 hours
- C.
12 hours
- D.
36 hours
Correct Answer
A. 24 hoursExplanation
Once an EMI problem is confirmed, it is essential to file a report promptly to address the issue. Filing a report within 24 hours allows for timely action and resolution of the problem. This ensures that any potential risks or disruptions caused by the EMI problem can be minimized or eliminated as soon as possible. Therefore, it is crucial to report the issue within 24 hours to maintain the safety and efficiency of the system.Rate this question:
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- 12.
What amplitude modulation (AM) receivers are particularly susceptible to power line noise?
- A.
High frequency
- B.
Very-high frequency
- C.
Very-high frequency and High frequency
- D.
Super high frequency
- E.
Very-high frequency, High frequency and Super high frequency
Correct Answer
C. Very-high frequency and High frequencyExplanation
AM receivers are particularly susceptible to power line noise in the Very-high frequency and High frequency range. This is because power line noise typically falls within these frequency ranges and can interfere with the AM signal. The noise can cause distortions and interruptions in the received signal, leading to poor reception quality. AM receivers operating in Very-high frequency and High frequency bands are more vulnerable to power line noise compared to receivers operating in other frequency ranges such as Super high frequency.Rate this question:
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- 13.
What are two types of coaxial transmission lines?
- A.
Rigid and flexible
- B.
Shielded pair and twin lead
- C.
Rigid and parallel two-wire
- D.
Flexible and shielded pair
Correct Answer
A. Rigid and flexibleExplanation
The correct answer is "rigid and flexible." Coaxial transmission lines can be classified into two types based on their construction and flexibility. Rigid coaxial cables have a solid outer conductor and are typically used in applications where stability and durability are important. Flexible coaxial cables, on the other hand, have a braided outer conductor and are more suitable for applications that require flexibility and ease of installation.Rate this question:
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- 14.
What action takes place when energy is reflected on a transmission line?
- A.
Standing waves form and the line impedance changes
- B.
Standing waves form and causes heat losses
- C.
Standing waves form and cause radiation losses
- D.
Line impedance changes causes heat losses
Correct Answer
A. Standing waves form and the line impedance changesExplanation
When energy is reflected on a transmission line, standing waves form and the line impedance changes. Standing waves occur when the incident and reflected waves interfere with each other, resulting in regions of maximum and minimum amplitudes along the line. This phenomenon is caused by impedance mismatches or changes in the line. The reflection of energy also leads to changes in the line impedance, which is the ratio of voltage to current in the transmission line.Rate this question:
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- 15.
What characteristics are uniform along the length of transmission lines?
- A.
Inductance and Impedance
- B.
Resistance and Inductance
- C.
Capacitance and Impedance
- D.
Resistance, Inductance and Capacitance
Correct Answer
D. Resistance, Inductance and CapacitanceExplanation
Transmission lines have uniform characteristics along their length, including resistance, inductance, and capacitance. Resistance refers to the opposition to the flow of electric current, inductance is the property that opposes changes in current, and capacitance is the ability to store electrical energy. These characteristics are distributed evenly along the transmission line and play a crucial role in determining the behavior and performance of the line in terms of signal propagation and power transmission.Rate this question:
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- 16.
How much will a horizontal polarized wave rotate the E and H fields?
- A.
90 degrees
- B.
180 degrees
- C.
360 degrees
- D.
45 degrees
Correct Answer
A. 90 degreesExplanation
A horizontal polarized wave will rotate the E and H fields by 90 degrees. This means that the electric field vector will be perpendicular to the magnetic field vector. This rotation occurs because the wave is propagating in a horizontal direction, causing the electric field to oscillate vertically and the magnetic field to oscillate horizontally.Rate this question:
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- 17.
What is the optical transmission path in a fiber optic cable?
- A.
Cladding
- B.
Coating
- C.
Core
- D.
Refractive index
Correct Answer
C. CoreExplanation
The optical transmission path in a fiber optic cable is the core. The core is the innermost part of the cable and is responsible for carrying the light signals. It is made of a highly transparent material, usually glass or plastic, and has a higher refractive index than the cladding surrounding it. This higher refractive index allows the light signals to be transmitted through the core by bouncing off the walls of the cladding through a process called total internal reflection. The core is protected by a coating, which provides additional protection and insulation.Rate this question:
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- 18.
What part of a fiber optic cable provides the reflective surface that allows light to propagate to the distant end?
- A.
Core
- B.
Cladding
- C.
Coating
- D.
Normal
Correct Answer
B. CladdingExplanation
The cladding is the part of a fiber optic cable that provides the reflective surface. It is a layer of material surrounding the core of the cable, with a lower refractive index than the core. This difference in refractive index causes the light to be reflected back into the core, allowing it to propagate to the distant end of the cable.Rate this question:
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- 19.
What part of a fiber optic cable protects it from scratches?
- A.
Core
- B.
Cladding
- C.
Coating
- D.
Refraction
Correct Answer
C. CoatingExplanation
The coating of a fiber optic cable is responsible for protecting it from scratches. The coating acts as a protective layer that surrounds the cladding and core of the cable, preventing any damage to the delicate components inside. Without the coating, the fiber optic cable would be more susceptible to scratches, which could disrupt the transmission of light signals through the cable.Rate this question:
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- 20.
What is the ratio of light's speed in a vacuum to its speed in a medium?
- A.
Reflection
- B.
Refractive index
- C.
Refraction
- D.
Angle of incidence
Correct Answer
B. Refractive indexExplanation
The refractive index is a measure of how much light slows down when it enters a medium compared to its speed in a vacuum. It is defined as the ratio of the speed of light in a vacuum to its speed in the medium. Therefore, the correct answer is refractive index.Rate this question:
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- 21.
What is the bending of light as it passes through materials of different density?
- A.
Reflection
- B.
Refraction
- C.
Angle of incidence
- D.
Refractive index
Correct Answer
B. RefractionExplanation
Refraction is the bending of light as it passes through materials of different density. When light travels from one medium to another, such as from air to water or from water to glass, it changes direction due to the change in speed. This change in direction is known as refraction. The amount of bending depends on the refractive index of the materials involved.Rate this question:
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- 22.
What is the bouncing of light from an object?
- A.
Refraction
- B.
Reflection
- C.
Refractive index
- D.
Angle of incidence
Correct Answer
B. ReflectionExplanation
Reflection is the bouncing of light from an object. When light hits a surface, it can bounce back in the same direction it came from, which is known as reflection. This phenomenon occurs when the surface is smooth and shiny, such as a mirror. The angle at which the light hits the surface, known as the angle of incidence, is equal to the angle at which it bounces off, known as the angle of reflection. Reflection is an important property of light and is responsible for allowing us to see objects that do not emit light themselves.Rate this question:
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- 23.
What is the imaginary line perpendicular to the interface of two media?
- A.
Angle of incidence
- B.
Reflection
- C.
Refraction
- D.
Normal
Correct Answer
D. NormalExplanation
The normal is an imaginary line that is perpendicular to the interface of two media. It is used to determine the angle of incidence, reflection, and refraction when light passes from one medium to another. The normal is crucial in understanding the behavior of light at the boundary between two different mediums.Rate this question:
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- 24.
What type of fiber optic connector has a conical shape?
- A.
ST connector
- B.
Biconic connector
- C.
SMA connector
- D.
FC connector
Correct Answer
B. Biconic connectorExplanation
A biconic connector is a type of fiber optic connector that has a conical shape. This shape allows for easy alignment and connection of the fiber optic cables. The conical shape helps to ensure a secure and reliable connection by providing a tight fit between the connector and the cable.Rate this question:
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- 25.
What type of fiber optic connector uses a push-pull arrangement for mating?
- A.
ST connector
- B.
FC connector
- C.
SMA connector
- D.
SC connector
Correct Answer
D. SC connectorExplanation
The SC connector uses a push-pull arrangement for mating. This means that the connector can be easily inserted and removed by simply pushing and pulling it. The push-pull design ensures a secure and reliable connection between the fiber optic cables, making it a popular choice in many applications.Rate this question:
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- 26.
What type of fiber optic connector is used in high vibration environments?
- A.
SMA connector
- B.
FC connector
- C.
ST connector
- D.
Biconic connector
Correct Answer
B. FC connectorExplanation
The FC connector is used in high vibration environments because it has a threaded design that provides a secure and reliable connection. The threaded coupling mechanism ensures that the connector remains tightly connected even in situations with high levels of vibration, preventing any signal loss or interruption. This makes the FC connector suitable for applications in industries such as aerospace, automotive, and industrial manufacturing where vibrations are common.Rate this question:
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- 27.
What type of fiber optic connector is the most widely used for local area networks and premise wiring?
- A.
SC connector
- B.
ST connector
- C.
FC connector
- D.
SMA connector
Correct Answer
B. ST connectorExplanation
The ST connector is the most widely used fiber optic connector for local area networks and premise wiring. It is a bayonet-style connector that is easy to install and provides a reliable connection. The ST connector is known for its durability and low insertion loss, making it suitable for high-speed data transmission. It is widely used in Ethernet and other networking applications due to its compatibility with multimode and single-mode fibers.Rate this question:
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- 28.
What type of fiber optic connector uses a quick release keyed bayonet coupling?
- A.
ST connector
- B.
SMA connector
- C.
Biconic connector
- D.
FC connector
Correct Answer
A. ST connectorExplanation
The ST connector uses a quick release keyed bayonet coupling. This means that it can be easily connected and disconnected by simply twisting it into place. The keyed bayonet coupling ensures a secure and reliable connection between the fiber optic cables.Rate this question:
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- 29.
What type of fiber optic connector were the first used on single mode fiber optic cable?
- A.
SC connector
- B.
SMA connector
- C.
Biconic connector
- D.
FC connector
Correct Answer
C. Biconic connectorExplanation
The Biconic connector was the first type of fiber optic connector used on single mode fiber optic cable.Rate this question:
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