2A656 CDC Vol 2 April 2012
Electrical Enviornmental Vol 2, Updated April 2012.
Questions and Answers
- 1.
Screwdrivers are sized by the length of the?
- A.
Blade
- B.
Shank
- C.
Handle
- D.
Ferrule
Correct Answer
B. ShankExplanation
Screwdrivers are sized by the length of the shank. The shank refers to the cylindrical portion of the screwdriver that connects the handle to the blade. The length of the shank determines the overall length of the screwdriver and is an important factor when selecting the appropriate tool for a specific task. A longer shank may be needed for reaching screws in deep or tight spaces, while a shorter shank may be more suitable for smaller, more precise jobs.Rate this question:
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- 2.
When striking an object with a hammer, the hammer face should be?
- A.
Parallel to the work
- B.
Offset to the work
- C.
Slightly angled
- D.
Slightly open
Correct Answer
A. Parallel to the workExplanation
When striking an object with a hammer, it is important for the hammer face to be parallel to the work. This ensures that the force is evenly distributed and maximizes the impact on the object being struck. If the hammer face is offset or angled, it may result in an uneven strike or cause the hammer to slip off the object. Therefore, keeping the hammer face parallel to the work is the correct technique to achieve effective and accurate strikes.Rate this question:
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- 3.
What kind of pliers are good for pulling cotter pins?
- A.
Snap rings
- B.
Vise grip
- C.
Long-nose
- D.
Diagonal cutting
Correct Answer
D. Diagonal cuttingExplanation
Diagonal cutting pliers are good for pulling cotter pins because they have sharp, angled jaws that can easily grip and cut through the pin. The diagonal cutting pliers provide a strong and precise cutting action, making them ideal for removing cotter pins effectively.Rate this question:
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- 4.
One advantage of box-end wrenches is that they?
- A.
Are the fastest to use
- B.
Can be hammered on saftley
- C.
Are not likely to slip off the nut
- D.
Are easy to use on recessed bolts
Correct Answer
C. Are not likely to slip off the nutExplanation
Box-end wrenches have a closed loop design that provides a secure grip on the nut. This design reduces the chances of the wrench slipping off the nut while applying force, making it less likely to cause accidents or damage to the workpiece.Rate this question:
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- 5.
Which wrench is usually the strongest, fastest, and safest to in a tool hit?
- A.
Socket
- B.
Box-end
- C.
Open-end
- D.
Adjustable
Correct Answer
A. SocketExplanation
A socket wrench is usually the strongest, fastest, and safest tool to use for hitting because it provides a secure grip on the fastener, allowing for maximum torque and minimizing the risk of slipping or stripping the bolt. It is also designed to be used with a ratchet, which allows for quick and efficient tightening or loosening of bolts. The socket wrench's design and functionality make it the preferred choice for professionals and DIY enthusiasts alike.Rate this question:
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- 6.
When filing aluminum or lead, you should use?
- A.
Rasp
- B.
Scribe
- C.
Mill file
- D.
Triangular file
Correct Answer
A. RaspExplanation
A rasp is the correct tool to use when filing aluminum or lead. It is a coarse file with sharp teeth that are designed to quickly remove material. The teeth on a rasp are more aggressive than those on other files, making it ideal for working with soft metals like aluminum and lead. The shape and size of the rasp also allow for better control and precision when filing these materials.Rate this question:
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- 7.
What type of gauge would you use to measure an actuating switch clearance?
- A.
Gap
- B.
Thread
- C.
Pressure
- D.
Thickness
Correct Answer
D. ThicknessExplanation
To measure an actuating switch clearance, you would use a thickness gauge. This type of gauge allows you to measure the gap or space between two objects accurately. In the context of an actuating switch, a thickness gauge would be used to determine the distance or clearance between the switch and its surrounding components. This measurement is important to ensure proper functioning and prevent any interference or malfunction.Rate this question:
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- 8.
The last verification date on a tourques wrench must not exceed?
- A.
60 workdays
- B.
30 workdays
- C.
60 calender-days
- D.
30 calender-days
Correct Answer
C. 60 calender-daysExplanation
The last verification date on a torque wrench must not exceed 60 calendar-days. This means that the torque wrench should be verified and calibrated within 60 days of its last verification date to ensure its accuracy and reliability. It is important to regularly verify torque wrenches to maintain their effectiveness and prevent any potential errors or inaccuracies in torque measurements.Rate this question:
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- 9.
A precaution concerning tourque wrenches is to?
- A.
Never use an extension with a tourque wrench
- B.
Never use another wrench to secure a bolt before torquing
- C.
Never us a tourque wrench that has been dropped unless it has been verified
- D.
Always calculate the leverage advantage before using a tourque wrench above its rated compacity
Correct Answer
C. Never us a tourque wrench that has been dropped unless it has been verifiedExplanation
The correct answer states that a precaution concerning torque wrenches is to never use a torque wrench that has been dropped unless it has been verified. This means that if a torque wrench has been dropped, it should be checked or verified for any damage or calibration issues before using it again. Dropping a torque wrench can potentially affect its accuracy and reliability, so it is important to ensure that it is still in proper working condition before using it for torque applications.Rate this question:
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- 10.
Before storing a tourque wrench you have used, you should?
- A.
Lubricate it with a light oil
- B.
Set it at its lowest setting
- C.
Check it for accuracy
- D.
Set it at zero setting
Correct Answer
B. Set it at its lowest settingExplanation
Before storing a torque wrench that has been used, it is recommended to set it at its lowest setting. This helps to relieve any tension on the internal spring mechanism, preventing it from becoming weak or damaged over time. By setting it at the lowest setting, the torque wrench is in a safe and neutral position for storage. This practice helps to maintain the accuracy and longevity of the torque wrench.Rate this question:
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- 11.
Tubing used in aircraft oxygen, fuel, lubrication, fire extinguishing, instruments, hydraulic, and vent lines is?
- A.
Stainless steel and teflon alloy
- B.
Stainless steel and copper tubing
- C.
Aluminum alloy and copper tubing
- D.
Aluminum alloy and stainless steel
Correct Answer
D. Aluminum alloy and stainless steelExplanation
The tubing used in aircraft for various purposes such as oxygen, fuel, lubrication, fire extinguishing, instruments, hydraulic, and vent lines is made of aluminum alloy and stainless steel. These materials are chosen for their durability, resistance to corrosion, and ability to withstand high pressure and temperature conditions in aircraft operations. Stainless steel is often used for its strength and resistance to corrosion, while aluminum alloy is lightweight and has good conductivity properties.Rate this question:
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- 12.
A properly installed bolt has a minimum of how many threads protruding through the nut?
- A.
Four
- B.
Three
- C.
Two
- D.
One
Correct Answer
C. TwoExplanation
A properly installed bolt should have a minimum of two threads protruding through the nut. This is important to ensure that the bolt is securely fastened and can withstand the required load. Having at least two threads engaged in the nut provides enough surface area for the bolt to grip and prevents it from loosening or coming undone. It also helps distribute the load evenly across the threads, reducing the risk of thread stripping or failure.Rate this question:
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- 13.
When tourquing a bolt assembly, what us the force applied to overcome friction?
- A.
Torsion
- B.
Tension
- C.
Tensile
- D.
Shear
Correct Answer
A. TorsionExplanation
When torquing a bolt assembly, the force applied to overcome friction is called torsion. Torsion is the twisting or rotational force that is applied to a bolt or fastener in order to tighten it. This force helps to overcome the friction between the threads of the bolt and the nut or the mating surfaces, allowing the bolt to be securely tightened. Torsion is commonly used in mechanical assemblies to ensure that the fasteners are properly tightened and can withstand the required loads and forces.Rate this question:
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- 14.
When installing a cotter pin, ensure the prong that bends over the bolt shank does not exceed the bolt nut?
- A.
Grip
- B.
Width
- C.
Length
- D.
Diameter
Correct Answer
D. DiameterExplanation
When installing a cotter pin, it is important to ensure that the prong that bends over the bolt shank does not exceed the diameter of the bolt nut. This is because if the prong exceeds the diameter of the nut, it may not properly secure the nut in place and could potentially lead to the nut becoming loose or falling off. Therefore, it is crucial to select a cotter pin with a diameter that matches or is smaller than the diameter of the bolt nut to ensure a secure installation.Rate this question:
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- 15.
Wire insulation may consist of several layers of nonconducting material that provides?
- A.
Thermal protection and fluid resistance
- B.
A method of identification
- C.
Protection from freezing
- D.
Strength and flexibility
Correct Answer
A. Thermal protection and fluid resistanceExplanation
Wire insulation may consist of several layers of nonconducting material that provides thermal protection and fluid resistance. This is important because it helps to prevent the wire from overheating and potentially causing a fire. Additionally, the insulation helps to protect the wire from any liquids or fluids that it may come into contact with, preventing any damage or short circuits.Rate this question:
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- 16.
Which technical order (TO) provides instructions for the Brady Wire Making System?
- A.
00-20-1
- B.
00-20-2
- C.
1-1A-8
- D.
1-1A-14
Correct Answer
D. 1-1A-14Explanation
The correct answer is 1-1A-14. This technical order provides instructions for the Brady Wire Making System.Rate this question:
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- 17.
Wires and wire bundles should be supported by clamps or grommets at intervals of no more than?
- A.
15 inches
- B.
20 inches
- C.
24 inches
- D.
26 inches
Correct Answer
C. 24 inchesExplanation
Wires and wire bundles should be supported by clamps or grommets at intervals of no more than 24 inches. This is important to prevent the wires from sagging or becoming loose, which could lead to electrical malfunctions or hazards. Adequate support ensures that the wires are secured and organized, reducing the risk of damage or interference with other components. By following this guideline, the wires can be properly managed and maintained, promoting safety and efficient operation.Rate this question:
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- 18.
Which color code and corresponding wire sizes are valid for a preinsulated terminal?
- A.
Yellow- 12 and 10
- B.
Brown- 22 and 20
- C.
Blue- 20 and 18
- D.
Red- 16 and 14
Correct Answer
A. Yellow- 12 and 10Explanation
The color code yellow corresponds to wire sizes 12 and 10. This means that a preinsulated terminal with a yellow color code can accommodate wires with either a size 12 or size 10.Rate this question:
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- 19.
The indent-type crimping tool should be used only on?
- A.
Preinsulated splices
- B.
Preinsulated terminals
- C.
Noinsulated terminals
- D.
Noninsulated terminal boards
Correct Answer
C. Noinsulated terminalsExplanation
The indent-type crimping tool should be used only on non-insulated terminals. This tool is specifically designed to create a secure and reliable connection for terminals that do not have any insulation. It may not be suitable for use on terminals that have pre-insulated splices or terminals, as the insulation may interfere with the crimping process. Similarly, it may not be recommended for use on non-insulated terminal boards, as these boards may require a different type of crimping tool for proper installation.Rate this question:
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- 20.
When joining copper and aluminum terminal lugs together on the same terminal board stud, separate them with?
- A.
A steel washer
- B.
A copper washer
- C.
A cadmium-plated washer
- D.
An aluminum-alloy washer
Correct Answer
C. A cadmium-plated washerExplanation
When joining copper and aluminum terminal lugs together on the same terminal board stud, it is important to separate them with a cadmium-plated washer. This is because copper and aluminum have different properties and can cause galvanic corrosion when they come into direct contact. The cadmium-plated washer acts as a barrier between the two metals, preventing corrosion and ensuring a secure and reliable connection.Rate this question:
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- 21.
What do you use as junction points for circuits that are frequently disconnected?
- A.
Conneector plugs
- B.
Terminal boards
- C.
Shielded wires
- D.
Splices
Correct Answer
A. Conneector plugsExplanation
Connector plugs are used as junction points for circuits that are frequently disconnected because they provide a secure and reliable connection that can easily be disconnected and reconnected without causing any damage to the circuit. They are designed to ensure a proper electrical connection and are commonly used in applications where frequent disconnections are required, such as in audio/video equipment, computer peripherals, and industrial machinery. Connector plugs allow for easy maintenance, troubleshooting, and component replacement without the need for soldering or permanent connections.Rate this question:
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- 22.
When heat is applied to thermofit material, which is used in compact wire bundles, it will shrink by at least?
- A.
One and a half times its original diameter
- B.
One-fourth its original diameter
- C.
One-half its original diameter
- D.
One time its original diameter
Correct Answer
C. One-half its original diameterExplanation
When heat is applied to thermofit material, it will shrink by one-half its original diameter.Rate this question:
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- 23.
Never use cushioned clamps in any bonding or grounding connection, because the cushion acts as?
- A.
A conductor
- B.
An insulator
- C.
A semi conductor
- D.
An alternate path for current
Correct Answer
B. An insulatorExplanation
Cushioned clamps should not be used in bonding or grounding connections because the cushion acts as an insulator. Insulators do not allow the flow of electric current, which is not desirable in these types of connections where the goal is to provide a low-resistance path for current to flow and prevent the buildup of static electricity. Using an insulating material like a cushion in these connections can compromise their effectiveness and safety.Rate this question:
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- 24.
After a bonding or grounding jumper is insulated, it should read no more than?
- A.
0.02 ohms
- B.
0.01 ohms
- C.
0.2 ohms
- D.
0.1 ohms
Correct Answer
D. 0.1 ohmsExplanation
When a bonding or grounding jumper is insulated, it should have a resistance of no more than 0.1 ohms. This ensures that the jumper provides an effective path for electrical current to flow in the event of a fault or surge, effectively grounding or bonding the system and preventing electrical hazards. A higher resistance could indicate a poor connection or insulation, which could compromise the effectiveness of the jumper in protecting against electrical faults.Rate this question:
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- 25.
Oxide film is removed from the surface of metals durning the soldering process by the use of?
- A.
A bristle brush
- B.
The soldering flux
- C.
A soldering iron tip
- D.
An approved solvent
Correct Answer
B. The soldering fluxExplanation
During the soldering process, oxide films can form on the surface of metals, which can prevent proper bonding. The soldering flux is used to remove these oxide films by chemically reacting with them. The flux contains active ingredients that dissolve or reduce the oxides, allowing the solder to adhere properly to the metal surface. Therefore, the soldering flux is the correct answer for removing oxide films during soldering.Rate this question:
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- 26.
In order to clean a plated soldering tip, use?
- A.
A fine file while the tip is cold
- B.
A course file while the tip is hot
- C.
An abrasive cloth while the tip is hot
- D.
An abrasive cloth while the tip is cold
Correct Answer
D. An abrasive cloth while the tip is coldExplanation
To clean a plated soldering tip, it is recommended to use an abrasive cloth while the tip is cold. Using a fine file while the tip is cold or a coarse file while the tip is hot can cause damage to the tip. Similarly, using an abrasive cloth while the tip is hot can also lead to damage. Therefore, using an abrasive cloth while the tip is cold is the correct method for cleaning a plated soldering tip.Rate this question:
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- 27.
Thermal shunts are used in soldering because they?
- A.
Make the part heat faster
- B.
Protect heat-sensitive components
- C.
Keep the lead and component at the same temperature
- D.
Give good holding action to the component being soldered
Correct Answer
B. Protect heat-sensitive componentsExplanation
Thermal shunts are used in soldering to protect heat-sensitive components. When soldering, excessive heat can damage or destroy delicate components. Thermal shunts help to dissipate heat and prevent it from reaching these sensitive parts, ensuring their protection during the soldering process.Rate this question:
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- 28.
You can best determine a soldered connection's quality by?
- A.
Reducing it slightly
- B.
Prying on it with a soldering aid
- C.
Giving it a thorough visual inspection
- D.
Pulling on it gently with your fingers
Correct Answer
C. Giving it a thorough visual inspectionExplanation
To determine the quality of a soldered connection, the best method is to give it a thorough visual inspection. By closely examining the solder joint, one can look for any signs of defects such as cold solder joints, insufficient solder, or improper alignment. Visual inspection allows for the identification of any visible issues that may affect the connection's integrity and functionality.Rate this question:
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- 29.
Prior to soldering electronic equipment, ensure the equipment is?
- A.
Disconnected from the power source
- B.
Connected to the power source
- C.
Protected from voltage spikes
- D.
Properly grounded
Correct Answer
A. Disconnected from the power sourceExplanation
Before soldering electronic equipment, it is important to disconnect it from the power source to avoid any potential electrical hazards. Soldering involves the use of heat and can pose a risk of electric shock or damage to the equipment if it is still connected to a power source. By disconnecting the equipment, it ensures the safety of the person performing the soldering as well as the integrity of the equipment being soldered.Rate this question:
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- 30.
How should you test the heat of a soldering iron?
- A.
Submerge the tip in flux
- B.
Hold the tip near your face
- C.
Touch the tip to the solder, near your body
- D.
Touch the tip to the solder, away from your body
Correct Answer
D. Touch the tip to the solder, away from your bodyExplanation
To test the heat of a soldering iron, you should touch the tip to the solder away from your body. This is the correct answer because it ensures safety by avoiding any potential harm to your face or body. By touching the tip to the solder away from your body, you can assess the heat of the soldering iron without risking any injuries or accidents.Rate this question:
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- 31.
How should you remove excess solder from the soldering iron tip?
- A.
Give the iron a quick flip
- B.
Wipe the iron on a damp sponge of rag
- C.
Gently tap the iron on a trash can edge
- D.
Let the iron cool and file away excess
Correct Answer
B. Wipe the iron on a damp sponge of ragExplanation
To remove excess solder from the soldering iron tip, it is recommended to wipe the iron on a damp sponge or rag. This method helps to clean the tip and remove any excess solder, allowing for better soldering performance. The dampness of the sponge or rag helps to cool down the solder and prevent it from sticking to the tip. By wiping the iron, any excess solder can be easily removed, ensuring a clean and efficient soldering process.Rate this question:
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- 32.
An acceptable tinned wire has?
- A.
No insulation clearance and wire strands covered with solder, but still visible
- B.
No insulation clearance and wire starands covered in solder, but not visible
- C.
An insulation clearance equal to the diameter of the wire and wire strands covered with solder, but still visible
- D.
An insulation clearance equal to the diameter of the wire and wire strands partially covered with solder, and still visible
Correct Answer
C. An insulation clearance equal to the diameter of the wire and wire strands covered with solder, but still visibleExplanation
An acceptable tinned wire has an insulation clearance equal to the diameter of the wire, which means that there is no insulation touching the wire strands. The wire strands are covered with solder, but the solder is still visible. This ensures that the wire is properly tinned and protected from corrosion while allowing for easy identification and inspection of the soldered area.Rate this question:
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- 33.
What do you have when you have a cold solder joint?
- A.
Low resistance to current
- B.
High resistance to current
- C.
An acceptable solder joint
- D.
A bright and shiney solder joint
Correct Answer
B. High resistance to currentExplanation
When you have a cold solder joint, it means that the solder joint was not properly heated during the soldering process, resulting in a poor connection. This poor connection leads to a high resistance to current flowing through the joint. Therefore, the correct answer is "High resistance to current."Rate this question:
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- 34.
During soldering, apply the proper amount of solder directly to the?
- A.
Iron tip
- B.
Component
- C.
Connection
- D.
Heat bridge
Correct Answer
C. ConnectionExplanation
During soldering, the proper amount of solder should be applied directly to the connection. This is because the solder is used to create a strong and reliable electrical and mechanical bond between the two components being connected. Applying the solder directly to the connection ensures that it flows and adheres properly, creating a secure joint.Rate this question:
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- 35.
Which choice best describes a good solder connection?
- A.
A dull grey appearance
- B.
No pits or holes and has a good concave fillet
- C.
No pits or holes and has a good convex fillet
- D.
Bright and shiny with a minimum of pits or holes
Correct Answer
B. No pits or holes and has a good concave filletExplanation
A good solder connection should have no pits or holes, indicating that the solder has properly filled the joint and there are no gaps. Additionally, it should have a good concave fillet, which means that the solder has formed a smooth and even curve along the joint, indicating a strong and reliable connection.Rate this question:
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- 36.
When marking wire connections to turret terminals, wrap the wire around the terminal at least?
- A.
90 degrees
- B.
180 degrees
- C.
270 degrees
- D.
360 degrees
Correct Answer
B. 180 degreesExplanation
When marking wire connections to turret terminals, it is recommended to wrap the wire around the terminal at least 180 degrees. This ensures a secure and reliable connection between the wire and the terminal, minimizing the risk of the wire coming loose or disconnecting. Wrapping the wire around the terminal at this angle also helps to maintain good electrical conductivity and reduce the chances of any signal loss or interference.Rate this question:
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- 37.
To connect wires or component leads to flat perforated terminals, the wrap must be?
- A.
45 degrees
- B.
60 degrees
- C.
90 degrees
- D.
180 degrees
Correct Answer
D. 180 degreesExplanation
To connect wires or component leads to flat perforated terminals, the wrap must be 180 degrees. This means that the wire or component lead should be wrapped around the terminal in a complete circle, forming a 180-degree angle. This ensures a secure and reliable connection between the wire/lead and the terminal, minimizing the risk of disconnection or poor conductivity.Rate this question:
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- 38.
What is the heaviest duty soldering iron you normally use in soldering a printed circuit board?
- A.
20 watts
- B.
27 watts
- C.
30 watts
- D.
35 watts
Correct Answer
B. 27 wattsExplanation
The heaviest duty soldering iron that is normally used in soldering a printed circuit board is 27 watts. This wattage is higher than the 20 watts option, indicating that it can generate more heat and is therefore more suitable for soldering tasks. However, it is lower than the 30 watts and 35 watts options, suggesting that these higher wattage soldering irons may be too powerful for soldering delicate circuit boards. Therefore, the 27 watts option strikes a balance between providing enough heat for soldering while still being suitable for delicate electronic components.Rate this question:
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- 39.
You should clean the circuit board connection within how long after it has cooled?
- A.
30 minutes
- B.
60 minutes
- C.
90 minutes
- D.
120 minutes
Correct Answer
C. 90 minutesExplanation
After a circuit board has cooled down, it is important to clean the circuit board connection within 90 minutes. This is because during the cooling process, dust, dirt, or other contaminants may settle on the board, which can potentially cause issues with the circuit's performance or functionality. Cleaning the board within this timeframe ensures that any potential contaminants are removed, allowing for optimal circuit performance.Rate this question:
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- 40.
Unclinched-lead terminations are of what type?
- A.
Special
- B.
Convex
- C.
Standard
- D.
Concave
Correct Answer
A. SpecialExplanation
Unclinched-lead terminations are of the special type.Rate this question:
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- 41.
How should a clinched-lead terminal lay in respect to the printed circuit pad?
- A.
90 degrees from the pad
- B.
180 degrees from the pad
- C.
Flat on the pad and in the direction of the printed circuit wiring pattern
- D.
Flat on the pad facing away from the direction of the circuit wiring pattern
Correct Answer
C. Flat on the pad and in the direction of the printed circuit wiring patternExplanation
A clinched-lead terminal should lay flat on the pad and in the direction of the printed circuit wiring pattern. This ensures proper alignment and connection between the terminal and the circuit. Laying the terminal flat on the pad also helps to maintain stability and prevent any potential damage or disconnection.Rate this question:
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- 42.
How should you hold a printed circuit board to desolder a component?
- A.
Flat
- B.
Vertically
- C.
Horizontally
- D.
45 degrees from vertical
Correct Answer
B. VerticallyExplanation
To desolder a component from a printed circuit board, it is best to hold the board vertically. Holding the board vertically allows the heat from the soldering iron to flow downwards, preventing any damage to nearby components or the board itself. This position also helps in ensuring that the soldered joint is heated evenly, making it easier to remove the component without causing any damage. Holding the board flat, horizontally, or at a 45-degree angle may result in uneven heating and potential damage to the board or other components.Rate this question:
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- 43.
To clean tinned, lead-plated circuit boards, use?
- A.
A medium-bristle brush and alcohol
- B.
A stiff-bristle brush and alcohol
- C.
An eraser and approved solvent
- D.
An approved solvent
Correct Answer
A. A medium-bristle brush and alcoholExplanation
To clean tinned, lead-plated circuit boards, a medium-bristle brush and alcohol should be used. This combination is effective in removing dirt and debris from the circuit boards without causing damage. The medium-bristle brush helps to gently scrub the surface, while the alcohol acts as a solvent to dissolve any contaminants. This method ensures that the circuit boards are thoroughly cleaned and ready for use.Rate this question:
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- 44.
When soldering a module-type package to a printed cicuit board, ensure the connection is soldered within?
- A.
3 seconds
- B.
5 seconds
- C.
7 seconds
- D.
10 seconds
Correct Answer
B. 5 secondsExplanation
When soldering a module-type package to a printed circuit board, it is important to ensure that the connection is soldered within 5 seconds. This time frame is crucial to ensure that the solder properly bonds the package to the circuit board and creates a reliable and secure connection. Soldering for too short a time may result in a weak connection, while soldering for too long may cause damage to the components or the board. Therefore, soldering within 5 seconds is the optimal time frame for this process.Rate this question:
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- 45.
You must repair a circuit board conductor if it has a nick that extends what part of its width?
- A.
10 percent
- B.
15 percent
- C.
20 percent
- D.
25 percent
Correct Answer
D. 25 percentExplanation
If a circuit board conductor has a nick that extends 25 percent of its width, it must be repaired. This means that if the nick covers a quarter of the width of the conductor, it is considered significant enough to require fixing. Nicks in the conductor can disrupt the flow of electrical current and affect the overall functionality of the circuit board. Therefore, any damage that extends 25 percent of the width should be addressed to ensure proper functioning of the circuit board.Rate this question:
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- 46.
When repairing a damaged terminal on a circuit board, the replacement foil should overlap the connecting circuit conductor by at least?
- A.
1.250 inch
- B.
0.250 inch
- C.
0.125 inch
- D.
0.0125 inch
Correct Answer
C. 0.125 inchExplanation
When repairing a damaged terminal on a circuit board, the replacement foil should overlap the connecting circuit conductor by at least 0.125 inch. This overlap ensures a secure and reliable connection between the replacement foil and the conductor, allowing for proper electrical conductivity. A larger overlap helps to prevent any potential gaps or weak points in the connection, reducing the risk of signal loss or circuit failure.Rate this question:
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- 47.
How many British thermal units (BTUs) does it take to raise the temperature of 5 pounds of water 5 degrees F?
- A.
1
- B.
5
- C.
17
- D.
25
Correct Answer
D. 25Explanation
It takes 25 BTUs to raise the temperature of 5 pounds of water by 5 degrees F.Rate this question:
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- 48.
A permanant magnet?
- A.
Loses its retentivity
- B.
Keeps its magnetism
- C.
Loses its permiablility
- D.
Keeps small amounts of reluctance
Correct Answer
B. Keeps its magnetismExplanation
A permanent magnet is a material that retains its magnetism over a long period of time. It is able to generate a magnetic field without the need for an external power source. This is due to the alignment of its magnetic domains, which remain in a fixed position even when the magnet is not in contact with other magnetic materials. Therefore, the correct answer is "Keeps its magnetism."Rate this question:
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- 49.
The greater the current flow through an electromagnet, the?
- A.
Greater the retentivity
- B.
Lesser the field strength
- C.
Greater the field strength
- D.
Higher the core reluctance
Correct Answer
C. Greater the field strengthExplanation
The greater the current flow through an electromagnet, the stronger the magnetic field it produces. This is because the magnetic field is directly proportional to the current flowing through the electromagnet. As the current increases, more magnetic field lines are generated, resulting in a stronger field strength.Rate this question:
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- 50.
The intensity of electrical current flow is measured in?
- A.
Volts
- B.
Cycles
- C.
Amperes
- D.
Coulombs
Correct Answer
C. AmperesExplanation
The intensity of electrical current flow is measured in Amperes. Amperes is the unit used to quantify the rate of flow of electric charge in a circuit. It represents the number of electrons passing through a point in a circuit per second. Volts measure the electrical potential difference, cycles represent the frequency of alternating current, and coulombs measure the quantity of electric charge.Rate this question:
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