3p051c Pretest For EOC Volume 2

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| By Jorge111

Jorge111

Community Contributor

Quizzes Created: 3 | Total Attempts: 926

Questions: 67 | Attempts: 40 | Updated: Mar 20, 2023

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Questions and Answers

1.

What is the approximate muzzle velocity for the M4 Carbine?
- A.
  
  2970 Feet per second (Fps)
- B.
  
  2975 fps
- C.
  
  3100 fps
- D.
  
  3500 fps
Correct Answer
A. 2970 Feet per second (Fps)

Explanation
The approximate muzzle velocity for the M4 Carbine is 2970 Feet per second (Fps).

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2.

Which assembly houses the trigger assembly, sear, hammer assembly, selector lever, rifle grip, bolt catch and buttstock assembly
- A.
  
  Bolt carrier assembly
- B.
  
  Charging handle assembly
- C.
  
  Upper receiver and barrel assembly
- D.
  
  Lower receiver and butt stock assembly
Correct Answer
D. Lower receiver and butt stock assembly

Explanation
The lower receiver and buttstock assembly houses various components including the trigger assembly, sear, hammer assembly, selector lever, rifle grip, bolt catch, and buttstock assembly. These components are essential for the functioning and control of the firearm. The bolt carrier assembly and charging handle assembly are part of the upper receiver and barrel assembly, which are responsible for the loading and chambering of rounds. Therefore, the correct answer is the lower receiver and buttstock assembly.

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3.

The test or inspection on the M4 carbine for a failure to a chamber malfunction requires an inspection of the action spring. what is the free length of the action spring on the M4 carbine?
- A.
  
  10 1/16 in to 11 1/4 in
- B.
  
  10 1/16 in to 13 1/4
- C.
  
  11 1/4 in to 12 1/2
- D.
  
  11 1/4 in to 14 1/4
Correct Answer
A. 10 1/16 in to 11 1/4 in

Explanation
The correct answer is 10 1/16 in to 11 1/4 in. This is the range of the free length of the action spring on the M4 carbine that needs to be inspected for a failure or chamber malfunction.

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4.

You have experienced a short recoil malfunction and found improper gap space in the gas rings. to prevent this from happening again, the bolt rings should be staggered approximately
- A.
  
  1/2 turn apart
- B.
  
  1/3 turn apart
- C.
  
  1/4 turn apart
- D.
  
  1/8 turn apart
Correct Answer
B. 1/3 turn apart

Explanation
The correct answer is 1/3 turn apart. Staggering the bolt rings approximately 1/3 turn apart helps to prevent a short recoil malfunction and ensures proper gap space in the gas rings. This allows for efficient gas seal and reliable cycling of the firearm.

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5.

If you replace the bolt carrier key, how many rounds of blank or ball rounds should be fired to ensure a seal is created?
- A.
  
  3 to 8
- B.
  
  4 to 6
- C.
  
  6 to 8
- D.
  
  8 to 10
Correct Answer
A. 3 to 8

Explanation
To ensure a seal is created when replacing the bolt carrier key, it is recommended to fire 3 to 8 rounds of blank or ball rounds. This is necessary to allow the key to properly settle and create a tight seal, ensuring optimal functioning of the firearm.

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6.

You should never fire blank ammunition at a target distance less than how many feet away from you ?
- A.
  
  10 feet
- B.
  
  15 feet
- C.
  
  20 feet
- D.
  
  25 feet
Correct Answer
C. 20 feet

Explanation
Firing blank ammunition at a target from a distance less than 20 feet can be dangerous. Blank ammunition still contains gunpowder, which can cause injury or even death if fired at close range. The recommended minimum distance of 20 feet ensures that the projectile has enough time to disperse and lose its velocity before reaching the target, reducing the risk of harm to the shooter and others nearby.

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7.

Which is the standard round used in the M16A2 and M4 series weapons and also linked and used in the M249
- A.
  
  Close combat mission capability kit M1042
- B.
  
  Cartridge, 5.56 mm armor piercing M995
- C.
  
  Cartridge, 5.56 mm, tracer, M856
- D.
  
  Cartridge, 5.56 mm, ball, M855
Correct Answer
D. Cartridge, 5.56 mm, ball, M855

Explanation
The correct answer is "cartridge, 5.56 mm, ball, M855." The M855 is the standard round used in the M16A2 and M4 series weapons and is also linked and used in the M249. It is a 5.56 mm ball cartridge, which means it is a standard full metal jacket round used for general purpose applications.

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8.

Cartridge 5.56 mm, tracer, M856 should not be used in the M16A1 except under emergency conditions and only at targets less than how many meters in the distance.
- A.
  
  60
- B.
  
  70
- C.
  
  80
- D.
  
  90
Correct Answer
D. 90

Explanation
The cartridge 5.56 mm, tracer, M856 should not be used in the M16A1 except under emergency conditions and only at targets less than 90 meters in the distance. This indicates that the M16A1 is not designed to effectively engage targets beyond 90 meters using the M856 tracer ammunition. Therefore, it is recommended to use this ammunition only in emergency situations and when engaging targets within a shorter range.

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9.

If adequate range facilities are not available for sustainment training, short range training ammunition can be used for any firing exercises of
- A.
  
  15 meters or less
- B.
  
  20 feet or less
- C.
  
  25 meters or less
- D.
  
  30 feet or less
Correct Answer
C. 25 meters or less

Explanation
If adequate range facilities are not available for sustainment training, short range training ammunition can be used for any firing exercises of 25 meters or less. This means that if there are limited resources for training in a proper shooting range, soldiers can still conduct firing exercises using short range training ammunition as long as the distance is within 25 meters or less. This allows for some level of training even in constrained environments.

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10.

Which part of the M9 pistol sits between the firing pin striker and the firing pin?
- A.
  
  Trigger block
- B.
  
  Hammer block
- C.
  
  Firing pin block
- D.
  
  Slide stop
Correct Answer
C. Firing pin block

Explanation
The firing pin block is the part of the M9 pistol that sits between the firing pin striker and the firing pin. It is designed to prevent accidental discharges by blocking the firing pin from moving forward unless the trigger is pulled. This safety mechanism ensures that the pistol will only fire when intentional pressure is applied to the trigger, enhancing the overall safety of the firearm.

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11.

Thinking weapons nomenclature, which button is located on the right side of the receiver, above and ahead of the trigger guard?
- A.
  
  Magazine release button
- B.
  
  Disassembly button
- C.
  
  Extractor button
- D.
  
  Slide stop button
Correct Answer
B. Disassembly button

Explanation
The correct answer is the disassembly button. This button is located on the right side of the receiver, above and ahead of the trigger guard. It is used to disassemble the weapon for cleaning or maintenance purposes.

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12.

The slide of you M9 pistol does not lock fully forward. what is the probable malfunction?
- A.
  
  The locking block and the lugs are cracked/burred or broken.
- B.
  
  The extractor is worn or broken
- C.
  
  The firing pin block is broken
- D.
  
  The feed ramp is damaged
Correct Answer
A. The locking block and the lugs are cracked/burred or broken.

Explanation
The probable malfunction for the slide of the M9 pistol not locking fully forward is that the locking block and the lugs are cracked, burred, or broken. This means that there is damage to the mechanism responsible for locking the slide in place, causing it to not fully engage and secure the slide in the forward position.

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13.

The free length of the m9 recoil spring should not be less than?
- A.
  
  5 in
- B.
  
  6 in
- C.
  
  12 in
- D.
  
  11 in
Correct Answer
A. 5 in

Explanation
The correct answer is 5 in. The free length of the M9 recoil spring should not be less than 5 inches. This is because the recoil spring plays a crucial role in absorbing and controlling the recoil of the firearm. If the free length is too short, it may not provide enough resistance to effectively manage the recoil, leading to potential issues with accuracy and reliability. Therefore, it is important to ensure that the free length of the M9 recoil spring is at least 5 inches.

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14.

You must replace the barrel of the m9 pistol if you find pitting in the bore area that exceeds
- A.
  
  Two land in width and 1/8 inch in length
- B.
  
  Two land in width and 3/8 inch in length
- C.
  
  One land in width and 3/8 inch in length
- D.
  
  One land in width and 1/8 inch in length
Correct Answer
C. One land in width and 3/8 inch in length

Explanation
If pitting is found in the bore area of the M9 pistol, it is necessary to replace the barrel if the pitting exceeds one land in width and 3/8 inch in length. This means that if the pitting is wider than the width of one land (the raised area between the grooves) and longer than 3/8 inch, it is considered excessive and the barrel should be replaced.

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15.

Which cycle of operation of the m9 pistol occurs after the round is fired, and the recoil causes the barrel and slide to move rearward
- A.
  
  Firing
- B.
  
  Extracting
- C.
  
  Locking
- D.
  
  Unlocking
Correct Answer
D. Unlocking

Explanation
After the round is fired, the recoil causes the barrel and slide to move rearward. This movement initiates the unlocking cycle of operation in the M9 pistol. During this phase, the barrel and slide separate, allowing the spent casing to be extracted from the chamber. Once the casing is extracted, the slide moves forward to load a new round into the chamber, completing the cycle of operation.

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16.

Which cycle of operation of the m9 pistol occurs as the slide moves forward and a round is stripped from the top of the magazine?
- A.
  
  Firing
- B.
  
  Locking
- C.
  
  Feeding
- D.
  
  Unlocking
Correct Answer
C. Feeding

Explanation
During the cycle of operation of the M9 pistol, the feeding stage occurs as the slide moves forward and a round is stripped from the top of the magazine. This stage involves the mechanism that feeds the round into the chamber of the pistol, preparing it for firing. The feeding process ensures that a fresh round is loaded and ready to be fired when the trigger is pulled.

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17.

Which is not a type of ammunition not used in the m9 pistol?
- A.
  
  Mk243 mod 0
- B.
  
  M821 ball
- C.
  
  M917 dummy
- D.
  
  9mm frangible
Correct Answer
B. M821 ball

Explanation
The M821 ball is not a type of ammunition used in the M9 pistol. The M9 pistol primarily uses 9mm ammunition, and the other options listed (mk243 mod 0, m917 dummy, and 9mm frangible) are all variations or types of 9mm ammunition. However, the M821 ball is not a recognized type of ammunition for the M9 pistol.

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18.

Personnel may use hollow point ammunition where not prohibited by geneva convention, status of forces agreement or
- A.
  
  UCMJ
- B.
  
  Manuals for courts martial
- C.
  
  Host nation requirements
- D.
  
  Federal law
Correct Answer
C. Host nation requirements

Explanation
The correct answer is host nation requirements. Personnel may use hollow point ammunition only if it is not prohibited by the host nation's requirements. This means that the use of hollow point ammunition is dependent on the regulations and laws set by the country where the personnel are operating.

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19.

On the shotgun, the serial number is located on the
- A.
  
  Stock
- B.
  
  Barrel
- C.
  
  Magazine
- D.
  
  Receiver
Correct Answer
D. Receiver

Explanation
The correct answer is receiver because the receiver is the main part of the shotgun that houses the firing mechanism and other important components. It is typically made of metal and is located at the rear of the shotgun. The serial number is usually engraved or stamped on the receiver for identification and tracking purposes.

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20.

Which step in the m870 shotgun cycle of operation occurs as the shooter pushed the fore-end towards the front of the weapon
- A.
  
  Unloacking
- B.
  
  Cocking
- C.
  
  Loading
- D.
  
  Feeding
Correct Answer
C. Loading

Explanation
When the shooter pushes the fore-end towards the front of the weapon in the M870 shotgun, it causes the loading step in the cycle of operation. This is because the forward movement of the fore-end allows a fresh round to be inserted into the chamber of the shotgun, preparing it for the next shot.

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21.

What is the difference between the mossberg 12-guage models 500 and 590 shotgun?
- A.
  
  The mossberg model 590 has an extended barrel
- B.
  
  The mossberg model 500 has an extended barrel
- C.
  
  The mossberg model 590 has a detachable heat shield
- D.
  
  The mossberg model 500 has a detachable heat shield
Correct Answer
C. The mossberg model 590 has a detachable heat shield

Explanation
The correct answer is that the Mossberg model 590 has a detachable heat shield. This means that the heat shield on the model 590 can be easily removed, while the model 500 may not have this feature.

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22.

What type of choke does the mossberg 12 gauge models 500 and 590 shotgun have?
- A.
  
  Automatic
- B.
  
  Cylinder
- C.
  
  Manual
- D.
  
  Cyclic
Correct Answer
B. Cylinder

Explanation
The Mossberg 12 gauge models 500 and 590 shotguns have a cylinder choke. This means that the shotgun barrel has a bore diameter that remains constant throughout its length, resulting in a wide shot pattern. This type of choke is suitable for close-range shooting and is often used for home defense or hunting in dense cover where a wider spread of shot is desired.

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23.

Which 12 gauge shotgun cartridge contains a pyrotechnic projectile in a corrugated plastic case with brass plated steel base
- A.
  
  Dummy
- B.
  
  Nonlethal
- C.
  
  Bird scare cartridge
- D.
  
  Breaching cartridge
Correct Answer
C. Bird scare cartridge

Explanation
A bird scare cartridge is the correct answer because it is a type of 12 gauge shotgun cartridge that contains a pyrotechnic projectile. This projectile is housed in a corrugated plastic case with a brass plated steel base. Bird scare cartridges are commonly used to scare away birds from agricultural fields or airports without causing harm to them.

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24.

This 12 gauge breaching cartridge is used to gain access through
- A.
  
  Entry ways and light armored vehicles
- B.
  
  Entry ways and steel reinforced doors
- C.
  
  Metal doors and entry ways
- D.
  
  Light doors and entry ways
Correct Answer
D. Light doors and entry ways

Explanation
The 12 gauge breaching cartridge is specifically designed to gain access through light doors and entryways. It may not be effective against heavy steel reinforced doors or armored vehicles.

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25.

What is the minimum safe distance for training for the m203 grenade launcher
- A.
  
  400 meters
- B.
  
  275 meters
- C.
  
  165 meters
- D.
  
  150 meters
Correct Answer
C. 165 meters

Explanation
The minimum safe distance for training for the M203 grenade launcher is 165 meters. This distance ensures that individuals are at a safe distance from the launcher when it is fired, reducing the risk of injury or harm. Being too close to the launcher when it is fired can result in serious injuries due to the blast and shrapnel. Therefore, it is important to maintain a minimum safe distance of 165 meters during training with the M203 grenade launcher.

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26.

The barrel assembly of the m203 grenade launcher is depressed. it unlocks the barrel so it can move forward along the
- A.
  
  Slide assembly
- B.
  
  Barrel assembly
- C.
  
  Receiver assembly
- D.
  
  Lower rail assembly
Correct Answer
C. Receiver assembly

Explanation
The correct answer is receiver assembly. The receiver assembly is responsible for housing and supporting the various components of the weapon, including the barrel assembly. When the barrel assembly of the M203 grenade launcher is depressed, it unlocks from the receiver assembly, allowing it to move forward along the slide assembly.

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27.

The barrel assembly of the m203 is chambered for which type of 40 millimeter grenade launcher ammunition?
- A.
  
  Low velocity
- B.
  
  High velocity
- C.
  
  Low explosive
- D.
  
  High explosive
Correct Answer
A. Low velocity

Explanation
The barrel assembly of the M203 is chambered for low velocity 40 millimeter grenade launcher ammunition. This means that the ammunition used in the M203 travels at a lower velocity compared to high velocity ammunition. Low velocity ammunition is typically used for shorter range engagements, while high velocity ammunition is used for longer range engagements.

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28.

In which air force technical order (AFTO) will you find PMCS procedures for the M203
- A.
  
  11W2-9-4-1
- B.
  
  11W3-9-4-2
- C.
  
  11W2-9-4-3
- D.
  
  11W3-9-4-4
Correct Answer
B. 11W3-9-4-2

Explanation
The correct answer is 11W3-9-4-2. This is because the question asks for the air force technical order (AFTO) that contains the PMCS (Preventive Maintenance Checks and Services) procedures for the M203. The specific AFTO mentioned, 11W3-9-4-2, is the one that contains the required information.

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29.

Cracks found on the m203 hand guard assembly during preventive maintenance checks and service that would render it not fully capable are cracks exceeding
- A.
  
  4 inch
- B.
  
  3 inch
- C.
  
  2 inch
- D.
  
  1 inch
Correct Answer
D. 1 inch

Explanation
During preventive maintenance checks and service, cracks exceeding 1 inch on the M203 hand guard assembly would render it not fully capable. This means that if cracks on the hand guard assembly are longer than 1 inch, the functionality and effectiveness of the assembly may be compromised. Therefore, it is important to identify and address any cracks exceeding this length to ensure the proper functioning of the M203 hand guard assembly.

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30.

Which tool is used to detect dents and minor damage in the m203 that would interfere with forward progress of a fired projectile?
- A.
  
  Bore dent detection tool
- B.
  
  Bore projectile width tool
- C.
  
  Bore constriction check tool
- D.
  
  Bore width and projectile tool
Correct Answer
C. Bore constriction check tool

Explanation
The Bore constriction check tool is used to detect dents and minor damage in the M203 that could obstruct the forward progress of a fired projectile. This tool helps ensure that the bore of the M203 is clear and free from any obstructions that could affect the performance of the weapon. It is specifically designed to check for any constrictions or blockages in the bore, allowing for the identification and rectification of any issues before firing the weapon.

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31.

What is the correct sequence when performing the firing pin protrusion test on the m203 grenade launcher?
- A.
  
  Cock, move the barrel forward, remove self locking screw, squeeze the trigger
- B.
  
  Squeeze the trigger, cock, move the barrel forward, remove self locking screw
- C.
  
  Remove self locking screw, cock, move the barrel forward, squeeze the trigger
- D.
  
  Squeeze the trigger, remove self locking screw, cock
Correct Answer
A. Cock, move the barrel forward, remove self locking screw, squeeze the trigger

Explanation
The correct sequence when performing the firing pin protrusion test on the M203 grenade launcher is to first cock the launcher, then move the barrel forward, followed by removing the self-locking screw, and finally squeezing the trigger. This sequence ensures that the firing pin protrusion is tested accurately and safely.

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32.

Which of the eight steps in the cycle of operations for the m203 grenade launcher occur at the same time?
- A.
  
  Extracting and ejecting
- B.
  
  Extracting and cocking
- C.
  
  Unlocking and cocking
- D.
  
  Loading and chambering
Correct Answer
B. Extracting and cocking

Explanation
In the cycle of operations for the M203 grenade launcher, the steps of extracting and cocking occur at the same time. Extracting refers to the removal of the spent casing from the chamber, while cocking involves preparing the weapon for firing by pulling back the cocking lever. These two actions happen simultaneously to ensure a smooth and efficient operation of the grenade launcher.

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33.

What is the arming distance for the M651 tactical chemical smoke round?
- A.
  
  10- 30 feet
- B.
  
  10-30 meters
- C.
  
  20-40 feet
- D.
  
  20-30 meters
Correct Answer
B. 10-30 meters

Explanation
The arming distance for the M651 tactical chemical smoke round is 10-30 meters. This means that the round needs to travel a distance of 10-30 meters before it arms and begins to release the smoke. This distance ensures that the round is at a safe distance from the user when it activates, minimizing the risk of injury or damage.

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34.

Which m203 grenade launcher rounds is designed to inflict personal casualties using an air-burst effect?
- A.
  
  M406, high explosive round
- B.
  
  M433, high explosive dual purpose
- C.
  
  M651, tactical chemical smoke grenade
- D.
  
  M397, high explosive jump up fragmentation
Correct Answer
D. M397, high explosive jump up fragmentation

Explanation
The M397 round is designed to inflict personal casualties using an air-burst effect. This means that when the round is fired from the M203 grenade launcher, it explodes in mid-air, creating a fragmentation pattern that is intended to cause harm to individuals in the vicinity. The "jump up" aspect of the round refers to its ability to explode at a predetermined height above the ground, maximizing its effectiveness in causing casualties. This type of round is commonly used in military operations where the goal is to neutralize enemy personnel.

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35.

The candle burn on a M583A1 white star parachute round is about
- A.
  
  40 seconds
- B.
  
  30 seconds
- C.
  
  20 seconds
- D.
  
  10 seconds
Correct Answer
A. 40 seconds

Explanation
The correct answer is 40 seconds. This is because the M583A1 white star parachute round is designed to burn for approximately 40 seconds.

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36.

What type of headspace does the m249 automatic rifle have?
- A.
  
  Split
- B.
  
  Fixed
- C.
  
  Gapped
- D.
  
  Adjustable
Correct Answer
B. Fixed

Explanation
The M249 automatic rifle has a fixed headspace. This means that the distance between the face of the bolt and the base of the cartridge case is set and cannot be adjusted. This fixed headspace ensures consistent and reliable functioning of the firearm.

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37.

This part of the m249 automatic rifle moves on the guide rail fixed to the right side of the receiver and pulls moving parts rearward
- A.
  
  Receiver assembly
- B.
  
  Slide assembly
- C.
  
  Piston assembly
- D.
  
  Cocking handle assembly
Correct Answer
D. Cocking handle assembly

Explanation
The cocking handle assembly is responsible for moving the moving parts of the M249 automatic rifle rearward. It is designed to slide on the guide rail fixed to the right side of the receiver, allowing it to pull the moving parts back. This action helps to load a new round into the chamber and prepare the rifle for firing.

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38.

Incorrectly positioning the first round of a partial belt on the m249 feed tray can cause which malfunction
- A.
  
  Failure to fire
- B.
  
  Sluggish operation
- C.
  
  Failure to chamber
- D.
  
  Failure to feed/stip
Correct Answer
D. Failure to feed/stip

Explanation
Incorrectly positioning the first round of a partial belt on the M249 feed tray can cause a malfunction known as "failure to feed/stip." This means that the weapon will not properly feed the ammunition into the chamber, resulting in a failure to fire. This can occur if the first round is not properly aligned or seated on the feed tray, preventing it from being picked up and fed into the chamber during the firing cycle.

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39.

When using the m249 the failure to chamber malfunction is characterized by
- A.
  
  A round of ammunition not fully seated in the barrel
- B.
  
  A spent cartridge located at the bottom of the receiver
- C.
  
  More than one broken strand in the drive spring
- D.
  
  A kinked, damaged or broken drive spring
Correct Answer
A. A round of ammunition not fully seated in the barrel

Explanation
The correct answer is a round of ammunition not fully seated in the barrel. This means that when using the m249, there is a malfunction where a round of ammunition is not properly inserted into the barrel. This can result in the weapon not firing properly or misfiring altogether. It is important to ensure that the ammunition is fully seated in the barrel to prevent this malfunction from occurring.

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40.

When does extracting begin during the m249 cycle operations
- A.
  
  During cocking cycle
- B.
  
  During unlocking cycle
- C.
  
  During feeding cycle
- D.
  
  During chambering cycle
Correct Answer
B. During unlocking cycle

Explanation
During the unlocking cycle, the M249 begins the process of extracting. This is when the bolt unlocks from the barrel extension, allowing it to move rearward and extract the spent casing from the chamber. The unlocking cycle is an essential part of the M249's operation, as it prepares the firearm for the ejection of the spent casing and the subsequent feeding of a new round into the chamber.

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41.

This m249 round of ammunition contains no propellant or primer
- A.
  
  M232 dummy
- B.
  
  M196 tracer
- C.
  
  M200 blank
- D.
  
  M193 ball
Correct Answer
A. M232 dummy

Explanation
The correct answer is m232 dummy. The m232 dummy round of ammunition does not contain any propellant or primer. It is used for training purposes or for simulating the weight and dimensions of live ammunition during drills and exercises. The absence of propellant and primer makes it safe to handle and eliminates the risk of accidental firing.

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42.

This m249 round of ammunition is distinguished by its seven petal rosette crimp and violet tip
- A.
  
  M232 dummy
- B.
  
  196 tracer
- C.
  
  M200 blank
- D.
  
  M193 ball
Correct Answer
C. M200 blank

Explanation
The given correct answer is "m200 blank". The explanation for this answer is that the m200 blank round of ammunition is characterized by its unique features, such as the seven petal rosette crimp and violet tip. This type of ammunition is specifically designed for training purposes or for creating noise and visual effects without the presence of an actual projectile. It does not contain a bullet and is considered safe for use in certain scenarios where live ammunition is not required.

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43.

M240b machine gun ammunition feeds from a bandoleer that holds how many rounds of ammunition?
- A.
  
  50
- B.
  
  100
- C.
  
  200
- D.
  
  150
Correct Answer
B. 100

Explanation
The m240b machine gun ammunition feeds from a bandoleer that holds 100 rounds of ammunition.

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44.

What is the maximum range for the M240B machine gun?
- A.
  
  3725 meters
- B.
  
  1800 meters
- C.
  
  1200 meters
- D.
  
  800 meters
Correct Answer
A. 3725 meters

Explanation
The maximum range for the M240B machine gun is 3725 meters. This means that the gun is capable of firing accurately at targets up to a distance of 3725 meters.

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45.

Which m240b machine gun assembly provides feeding, stripping, chambering, firing, extraction, and ejection of cartridges using projection propelling gas for power?
- A.
  
  Barrel assembly
- B.
  
  Driving spring rod assembly
- C.
  
  Bolt and operating rod assembly
- D.
  
  Feed tray and receiver assembly
Correct Answer
C. Bolt and operating rod assembly

Explanation
The bolt and operating rod assembly is responsible for providing feeding, stripping, chambering, firing, extraction, and ejection of cartridges using projection propelling gas for power. This assembly is crucial for the functioning of the M240B machine gun as it controls the entire firing process and ensures the smooth operation of the weapon.

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46.

Which would be a primary cause for a failure to feed in the M240B machine gun?
- A.
  
  Broken sear
- B.
  
  Broken firing pin
- C.
  
  Damage extractor
- D.
  
  Insufficient gas pressure
Correct Answer
D. Insufficient gas pressure

Explanation
Insufficient gas pressure can be a primary cause for a failure to feed in the M240B machine gun. The M240B operates using gas pressure to cycle the action and feed the next round into the chamber. If there is not enough gas pressure, the action may not cycle properly, resulting in a failure to feed. This can be caused by various factors such as a clogged gas port, a malfunctioning gas regulator, or issues with the gas system components.

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47.

When inspecting the barrel assembly of the M240B machine gun check for bulges, bends, burrs obstructions or pits in the
- A.
  
  Breach assembly
- B.
  
  Chamber or bore
- C.
  
  Feed tray
- D.
  
  Plug
Correct Answer
B. Chamber or bore

Explanation
When inspecting the barrel assembly of the M240B machine gun, it is important to check for any bulges, bends, burrs, obstructions, or pits in the chamber or bore. This is because any of these issues can affect the performance and accuracy of the weapon. Bulges, bends, or pits in the chamber or bore can cause problems with the chambering and extraction of rounds, while burrs or obstructions can interfere with the smooth movement of the bullet. Therefore, ensuring that the chamber or bore is free from any of these issues is crucial for the proper functioning of the M240B machine gun.

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48.

Which gauge is used to inspect the M240B machine gun for barrel erosion
- A.
  
  Barrel wear gauge
- B.
  
  Pre-embarkation gauge
- C.
  
  Muzzle and breach or wear gauge
- D.
  
  Chamber and barrel assembly gauge
Correct Answer
C. Muzzle and breach or wear gauge

Explanation
The M240B machine gun is inspected for barrel erosion using the muzzle and breach or wear gauge. This gauge is specifically designed to measure the amount of wear and erosion that has occurred in the barrel of the machine gun. By using this gauge, the user can determine if the barrel is still within acceptable limits and if it needs to be replaced or repaired.

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49.

During the feeding cycle operation for the M240B machine gun actuating rollers move the feed lever side to side which in turn does what
- A.
  
  Loads the weapon
- B.
  
  Releases the sear
- C.
  
  Moves the feed paws
- D.
  
  Strips a round from the belt
Correct Answer
C. Moves the feed paws

Explanation
During the feeding cycle operation for the M240B machine gun, the actuating rollers move the feed lever side to side. This movement of the feed lever causes the feed paws to move, which is responsible for picking up and positioning the ammunition belt. Therefore, the correct answer is "Moves the feed paws."

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50.

Which of these M240B machine gun rounds is used for training local and urban training areas where range restrictions preclude the use of full range standard service ammunition
- A.
  
  M933 armor piercing
- B.
  
  M973 short range training ammunition ball
- C.
  
  M974 short range target ammunition
- D.
  
  M80 ball
Correct Answer
B. M973 short range training ammunition ball

Explanation
The M973 short range training ammunition ball is used for training local and urban training areas where range restrictions prevent the use of full range standard service ammunition. This ammunition is specifically designed for short-range training purposes, allowing soldiers to practice their shooting skills in confined spaces without the risk of exceeding range limitations. It provides a realistic training experience while ensuring safety and compliance with range regulations.

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Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

Current Version
Mar 20, 2023

Quiz Edited by
ProProfs Editorial Team
Aug 23, 2015

Quiz Created by
Jorge111

3p051c Pretest For EOC Volume 2

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