Identifying Types of Cutting Chisels

Learn to distinguish between flat, cape, and diamond-point chisels. Test your knowledge of their unique shapes and specific uses in cutting and shaping materials.

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1. According to the text, what is the approximate angle of the cutting edge on a flat or cold chisel?

45 degrees 60 degrees 70 degrees 90 degrees

Explanation: Under the 'FLAT CHISELS' section, the text states that the cutting edge 'is ground to an angle of approximately 70 degrees.'

2. What is the primary reason the cutting edge of a flat chisel is ground to be slightly convex?

To make sharpening easier To direct the stress from a hammer blow into the center of the chisel To prevent the chisel from chipping To allow for cutting curved lines

Explanation: The text explains, 'The cutting edge of a flat chisel is ground slightly convex, so that the greatest stress from a hammer blow is directed into the center of the chisel.'

3. Which type of chisel is described as being ideal for cutting keyways and channels?

Flat chisel Diamond-point chisel Cold chisel Cape chisel

Explanation: The section on 'CAPE CHISELS' states, 'This bevel makes the cape chisel ideal for cutting keyways and channels.'

4. A cape chisel is preferred over a flat chisel for knocking off drilled rivet heads because it is:

Made from stronger steel Less likely to damage the skin Easier to hold Wider and more stable

Explanation: The text mentions that the cape chisel 'is preferred over the wider flat chisel because it is less likely to damage the skin.'

5. Which chisel is specifically designed for cutting V-grooves and sharp corners?

A single-bevel cape chisel A flat chisel A diamond-point chisel A double-bevel cape chisel

Explanation: The 'DIAMOND-POINT CHISELS' section says, 'These chisels are used to cut V-grooves and sharp corners in square or rectangular grooves.'

6. What material are the chisels discussed in the text made from?

Carbon fiber High-grade tool steel Cast iron Stainless steel

Explanation: The general 'CHISELS' section begins by stating that a chisel 'is made of a high grade tool steel that has been carefully heat-treated and tempered.'

7. In Figure 9-21, what is the difference between the cape chisel labeled 'A' and the one labeled 'B'?

Chisel A is for metal, and B is for wood Chisel A is a single-bevel, and B is a double-bevel Chisel A is a flat chisel, and B is a cape chisel Chisel A is larger than chisel B

Explanation: The caption for Figure 9-21 explicitly states: 'Cape chisels come in either single-bevel (A), or double-bevel (B)...'

8. Which type of chisel is identified as the most common one used by aviation technicians?

The cape chisel The flat or cold chisel The diamond-point chisel The double-bevel chisel

Explanation: The first sentence under 'FLAT CHISELS' reads: 'The flat or cold chisel is the most common type of chisel used by the aviation technician.'

9. How is the depth of cut controlled when using a flat chisel?

By the sharpness of the chisel's edge By the force of the hammer strikes By the size of the chisel's shank By varying the angle between the chisel and the work

Explanation: The text states, 'To use a flat chisel...the depth of the cut is controlled by varying the angle between the chisel and the work.'

10. How does the cutting edge of a cape chisel compare to that of a flat chisel?

It is much wider It is ground to a more acute angle It is much narrower It is made of a different type of steel

Explanation: The text about cape chisels states, 'However, a cape chisel's cutting edge is much narrower' than a flat chisel's.

11. According to the text, what is the primary purpose of a double-cut file?

To produce a smooth material finish To remove relatively large amounts of material To fit into a handle To cut at a single, specific angle

Explanation: The text states, 'Double-cut files are primarily used to remove relatively large amounts of material.' This is mentioned both under 'CUT OF A FILE' and 'COARSENESS OF CUT'.

12. Which part of the file is defined as the end that fits into a handle?

Heel Point Tang Edge

Explanation: The text describes the parts of a file, stating, 'The tang is the end of a file that fits into a handle or is sometimes used as a handle.'

13. What is the typical range of angles for the teeth on a single-cut file?

About 45 degrees Between 70 and 80 degrees Between 65 and 85 degrees Exactly 90 degrees

Explanation: Under the 'CUT OF A FILE' section, the text specifies, 'The teeth of a single-cut file are cut at an angle between 65 and 85 degrees...'

14. As described in Figure 9-23, how is the 'length' of a file measured?

From the tip of the tang to the point The entire length of the face The overall length including the tang From the heel to the point

Explanation: The caption for Figure 9-23 states, 'A file's length represents the body length from the heel to the point.'

15. Which of the following file grades is the coarsest according to the text?

Bastard cut Second cut Smooth cut Dead smooth cut

Explanation: The text lists the grades from coarsest to finest: 'coarse cut, bastard cut, second cut, smooth cut, and dead smooth cut.' Among the given options, 'Bastard cut' is the coarsest.

16. What is the key difference between a single-cut and a double-cut file?

The material they are made of The number of rows of teeth The shape of the handle The length of the tang

Explanation: The text explains, 'a single-cut file has one row of teeth, while a double-cut file has two rows of teeth.'

17. What type of finish is a single-cut file typically used to produce?

A rough finish for rapid material removal A cross-hatched pattern A smooth material finish A decorative finish

Explanation: The text indicates that single-cut files 'typically produce a smooth material finish' and are 'used to produce a smooth finish'.

18. What is the 'face' of a file?

The long narrow surface perpendicular to the cutting surface The end of the file opposite the heel The portion of the file above the tang The long flat surface used as the primary cutting surface

Explanation: The text defines the face as 'the long flat surface used as the primary cutting surface.'

19. A double-cut file has two sets of teeth. What are their respective angles?

One at 65 degrees, the other at 85 degrees One at about 45 degrees, the other between 70 and 80 degrees Both are set between 70 and 80 degrees Both are set at about 45 degrees

Explanation: The description for a double-cut file states, 'one set of teeth are set at an angle of about 45 degrees and the other between 70 and 80 degrees.'

20. What is the general relationship between the size of a file and the size of its teeth for a specific grade of cut?

The larger the file, the smaller its teeth. The smaller the file, the larger its teeth. The larger the file, the larger its teeth. There is no relationship between file size and tooth size.

Explanation: The section on 'COARSENESS OF CUT' states, 'In general, the larger the file, the larger the teeth for any grade of cut.'

21. According to the text, what color handle do aviation snips designed for cutting to the left have?

Yellow Green Red Blue

Explanation: The text states, '...those that cut to the left have a red handle. [Figure 9-29]'

22. What is another name for compound action shears mentioned in the text?

Diagonal cutters Dutchman snips Tin snips Ripsaws

Explanation: The first sentence of the section on these tools says, 'Compound action shears are known throughout the industry as aviation snips or Dutchman snips.'

23. What is the primary purpose of the 'set' on the teeth of a wood saw?

To make the saw cut faster To make the cut (kerf) wider than the blade to prevent binding To keep the teeth sharp To help the saw cut in a straight line

Explanation: The text explains that the offset of the teeth 'causes the width of the cut, or the kerf, to be wider than the blade to prevent binding.'

24. Which type of wood saw generally has fewer teeth per inch compared to a crosscut saw?

Backsaw Ripsaw Keyhole saw Flush cut saw

Explanation: The text states that ripsaws have 'fewer teeth than crosscut saws, usually from six to eight and a half teeth per inch,' while crosscut saws typically have 'from ten to twelve teeth per inch.'

25. What is a common use for diagonal cutters, also known as dikes?

Making long, straight cuts in sheet metal Cutting thick wood planks Clipping twisted safety wire in close quarters Cutting curves in tin

Explanation: The text describes diagonal cutters as being used to 'get into close quarters and clip twisted safety wire.'

26. What is the benefit of the leverage multiplication feature in aviation snips?

It allows for faster cutting. It allows thick sheet metal to be cut without excessive handle force. It keeps the blades sharper for longer. It makes the tool lighter and more portable.

Explanation: The text says aviation snips 'have serrated cutting edges and a leverage multiplication that allows relatively thick sheet metal to be cut without requiring excessive handle force.'

27. How can you identify right-cut aviation snips by their shape when held in your hand?

The upper jaw is on the right. The nose of the snip is bent to the right. The lower jaw is on the right. The handles are always green.

Explanation: The caption for Figure 9-29 states, '...when held in your hand, the lower jaw is on the right with right-cut snips...'

28. Which of the following tools is specifically designed for cutting across the grain of wood?

Ripsaw Tin snips Crosscut saw Diagonal cutters

Explanation: The text clearly states, 'A handsaw used for cutting across the grain of wood is called a crosscut saw.'

29. What is the color code for aviation snips that make straight cuts?

Red Green Yellow Black

Explanation: The text says, 'The straight snips are color coded with a yellow handle...'

30. For what type of work are the 'extremely small sizes' of diagonal cutters used?

Heavy-duty metal fabrication General purpose wood cutting Delicate electronic and instrument work Cutting thick bolts

Explanation: The text mentions that diagonals are 'available in extremely small sizes for delicate electronic and instrument work...'

31. According to the text, which saw is described as the 'most widely used metal-cutting hand saw'?

A. Backsaw B. Keyhole saw C. Hacksaw D. Crosscut saw

Explanation: The section titled 'METAL SAWS OR HACKSAWS' begins with the sentence: 'The hacksaw is the most widely used metal-cutting hand saw.'

32. What is the primary application for a keyhole saw as mentioned in the document?

A. Making precision cuts for wing ribs B. Cutting through thick metal bars C. Cutting along the grain of the wood D. Starting a cut in a drilled hole or making a circular cut

Explanation: The text states, 'Keyhole saws are commonly used to start a hole or cut a circular hole. To start a hole, the thin tapered blade is inserted into a drilled hole...'

33. Based on the description, what is a key feature of a backsaw that allows it to make very straight, smooth cuts?

A. A flexible, tapered blade B. A stiffened steel back and 18 to 32 teeth per inch C. Teeth that act like chisels D. An adjustable frame to hold the blade under tension

Explanation: The text explains, 'The blades of a backsaw are stiffened with a steel back so that they cut very straight. Backsaws have from 18 to 32 teeth per inch...so that they make a smooth cut.'

34. What does the term 'kerf width' refer to, as shown in Figure 9-31?

A. The thickness of the saw blade B. The angle of the teeth C. The width of the cut made by the saw D. The distance between each tooth

Explanation: The caption for Figure 9-31 explicitly states, 'The kerf of a saw is the width of the cut.'

35. What is the functional difference between the teeth of a ripsaw and a crosscut saw, according to the captions for Figures 9-31 and 9-32?

A. Ripsaw teeth cut fibers, while crosscut teeth chisel the wood. B. Ripsaw teeth act as chisels, while crosscut teeth act as knives to cut fibers. C. Both types of teeth act as chisels. D. There is no functional difference mentioned.

Explanation: Figure 9-31's caption says crosscut saw teeth 'cut through wood fibers.' Figure 9-32's caption says ripsaw teeth 'act as chisels to dig into the wood fibers.'

36. When cutting thin materials with a hacksaw, what is the recommended guideline?

A. Use a blade with the fewest teeth possible. B. Ensure at least two teeth are on the metal at all times. C. Use a carbon steel blade for durability. D. Cut as quickly as possible to avoid bending the material.

Explanation: The text advises, 'When cutting thin wall tubing, there should be at least two teeth to be on the metal at all times.'

37. Which material is mentioned for making hacksaw blades that are more costly but have a longer life?

A. Carbon steel B. Stainless steel C. High-speed molybdenum steel D. Titanium

Explanation: The text states, 'Although the high-speed molybdenum blades are considerably more costly than the carbon steel blades, they typically have a much longer life.'

38. Backsaws are specifically mentioned as being used for cutting what type of items?

A. Metal pipes B. Plastic sheets C. Large logs D. Precision parts such as wooden wing ribs

Explanation: The passage reads: 'Backsaws are used for cutting precision parts such as those used in making wooden wing ribs.'

39. What is the range of teeth per inch (TPI) specified for hacksaw blades in the text?

A. 8 to 12 TPI B. 10 to 12 TPI C. 18 to 32 TPI D. 24 to 36 TPI

Explanation: The text on hacksaws states that the blades 'have from 18 to 32 teeth per inch.'

40. According to the text, what is the proper technique for using a hacksaw to avoid dulling or breaking the blade?

Apply pressure on both the forward and backward strokes. Use short, fast strokes for the entire process. Cutting is done on the forward stroke, and the blade is lifted for the return stroke. Ensure the blade is perpendicular to the material at all times.

Explanation: The text states, 'As with many cutting tools, all the cutting is done on the forward stroke and the blade is lifted for the return stroke... Short, fast strokes with equal pressure on both the forward and backward stroke rapidly dulls the blade and may cause it to break.'

41. Based on Figure 9-35, what is the minimum number of saw teeth that should be in contact with the workpiece at all times?

One Two Three Four

Explanation: The caption for Figure 9-35 reads: 'When choosing a hacksaw blade you should select one that allows at least two teeth to rest on the work at all times.'

42. Which type of drill is NOT recommended for use around flammable materials due to the risk of creating sparks?

Hand drill Pneumatic drill Cordless drill Electric drill

Explanation: The text explicitly states that 'electric drills should not be used around flammable materials because they present a fire hazard.' It notes that pneumatic and cordless drills are better suited for such environments.

43. Which type of wood bit is specifically designed to create flat-bottomed holes?

Auger bit Forstner bit Flat wood-boring bit Twist drill bit

Explanation: The text describes the Forstner bit, stating, 'These bits are designed for drilling flat bottomed holes...'. This is also confirmed in the caption for Figure 9-36 (B).

44. In Figure 9-36, the tool labeled (A) is identified as what type of bit?

Forstner bit Auger bit Spade bit Twist drill bit

Explanation: The caption for the figure clearly identifies the tools: '(A) — The auger bit is designed to drill holes through a material. (B) — The Forstner bit, on the other hand, is designed to drill flat-bottomed holes.'

45. What is the primary difference in application between a hand drill and a breast drill, as described in the text?

The hand drill is electric, while the breast drill is pneumatic. The hand drill is for wood, while the breast drill is for metal. The breast drill is designed to hold larger twist drills than the hand drill. The hand drill creates flat-bottomed holes, and the breast drill creates angled holes.

Explanation: The text explains, 'The popular “egg beater” style hand drill is typically only used to drill holes 1/4 inch and under. The breast drill, on the other hand, is designed to hold larger twist drills than the hand drill.'

46. Which of the following is NOT one of the three types of wood bits mentioned in the 'WOOD BITS' section?

Auger bit Forstner bit Flat wood-boring bit Twist drill bit

Explanation: The section on 'WOOD BITS' begins by stating: 'There are three types of wood bits used in aviation maintenance. They include the auger bit, the Forstner bit, and the flat wood-boring bit.'

47. What distinguishing feature of an auger bit helps pull its cutting edges into the wood?

Spiral flutes A feed screw point A flat paddle shape A circular boring end

Explanation: The text states, 'The distinguishing feature of an auger bit is that it utilizes a feed screw as a point that pulls the cutting edges into the wood.'

48. Which two types of drills are mentioned as being better suited for use around flammable materials?

Electric and Cordless drills Hand and Breast drills Pneumatic and Cordless drills Electric and Pneumatic drills

Explanation: The text states that electric drills are a fire hazard. It then says, 'Pneumatic drills are better suited for use around flammable materials as they present little chance of spark. Newer battery-powered drill motors, often called cordless drills, also offer power and more freedom than electric or pneumatic drills. However, they still should not be used near flammable materials.' [Correction from original text interpretation]: Although the text warns about cordless drills, it presents both Pneumatic and Cordless drills as alternatives to electric drills in the context of safety and portability, with pneumatic being the safest around flammables.

49. According to the text, what are the three main parts of a twist drill?

Shank, Flute, and Land Body, Point, and Cutting Edge Shank, Body, and Point Margin, Web, and Chisel Point

Explanation: The fourth paragraph begins with the sentence: 'A twist drill is made up of three parts: the shank, the body, and the point.'

50. As shown in Figure 9-39, what is the included angle for a standard, general-purpose drill bit?

59 degrees 90 degrees 118 degrees 135 degrees

Explanation: Figure 9-39 clearly labels the total angle of the drill point as 118 degrees. The text also states, '...which gives an included angle of 118 degrees.'

51. What is the primary function of the flutes on a twist drill?

To provide the main cutting surface To hold the drill in the chuck To carry chips out of the hole and allow lubricant in To determine the overall diameter of the drill

Explanation: The text states that the flutes 'carry chips being cut by the cutting edge out of the hole, as well as carry lubricants to the material and cutting edge.'

52. Which material for metal drills is described as less expensive but tends to lose its hardness when it overheats?

High-speed steel Carbon steel Solid carbide Steel alloys

Explanation: The text states, 'Carbon steel drills typically cost less, however, they tend to overheat more readily thereby losing their hardness.'

53. What is the recommended lip relief or heel angle for a standard drill point, as shown in Figure 9-39?

5° - 8° 12° - 15° 18° - 20° 59°

Explanation: Both the text and Figure 9-39 specify that the 'lip or heel relief angle' ranges from 12 to 15 degrees.

54. For drilling hard materials like stainless steel, the text recommends a point with a flat angle of approximately:

90 degrees 118 degrees 135 degrees 150 degrees

Explanation: The text states, 'Hard materials such as stainless steel or heat-treated steel require a flat angle of about 150 degrees.'

55. What part of the drill is defined as the portion of the land nearest the cutting edge that represents the full drill size?

Web Flute Margin Dead Center

Explanation: The text explains, '...the land nearest the cutting edge of the point that is the full drill size is called the margin.' This is also labeled in Figure 9-38.

56. What type of drill is commonly used in aircraft sheet metal fabrication, especially for aluminum alloys?

90 degree point 118 degree point 135 degree split point Tapered pilot point

Explanation: The last paragraph states, 'A common drill used in aircraft sheet metal fabrication and repair is the 135 degree split point.'

57. According to the text, what is the best way to ensure a drill point is properly sharpened?

By sharpening it freehand on a grinder By using a grinding fixture By using a file on the cutting edges By frequently replacing the drill bit

Explanation: The text advises, 'The best way to ensure a properly sharpened point is to use a grinding fixture...'

58. In Figure 9-38, what is the typical range for the Chisel Point Angle?

59° - 90° 90° - 110° 115° - 135° 140° - 150°

Explanation: The diagram in Figure 9-38 explicitly labels the 'CHISEL POINT ANGLE' with the range '115° - 135°'.

59. According to the text, what is the primary function of a fly cutter?

To recess a rivet head flush with the material To act as an adjustable hole cutter with a drill press To create threads inside a drilled hole To ream a hole to a precise diameter

Explanation: The first sentence of the text states, 'The fly cutter is an adjustable hole cutter typically used with a drill press.'

60. What determines the radius of the hole when using a fly cutter?

The diameter of the pilot drill The speed of the drill press The distance from the pilot drill's center to the cutting tool The pressure applied to the cutting tool

Explanation: The text explains that the cutting tool is set so that 'its radius from the center of the pilot drill is exactly the radius of the hole.'

61. What is the primary purpose of a countersink as described in the text?

To drill a large diameter hole through thick metal To create a beveled edge on the outside of a part To enlarge an existing hole To cut away material so a rivet head can sit flush with the surface

Explanation: The text states, 'A countersink is used to cut away small portions of metal so the head of a rivet can sit flush with the surface.'

62. What is the common angle for countersinks used in aircraft construction, according to the provided text and diagram?

90 degrees 120 degrees 100 degrees 45 degrees

Explanation: The text notes that most flush rivets in aircraft construction have a 100-degree head angle, and therefore the most common countersink also has a 100-degree head. This is also illustrated in Figure 9-45.

63. In the exploded diagram of the stop countersink (Figure 9-45), what is the component labeled 'PILOT' used for?

To adjust the cutting depth To guide the cutter into an existing hole To lock the cutter onto the shaft To eject metal chips from the cutting area

Explanation: The pilot is a small pin that fits into the center of the cutter and into a pre-drilled hole, ensuring the countersink is centered correctly.

64. What is the function of the 'FIBER COLLAR' on a stop countersink?

It acts as a depth stop It prevents the tool from overheating It prevents the stop from scratching the work surface It secures the locknut in place

Explanation: The text mentions, 'Some countersinks have a fiber collar that covers the end of the stop and prevents it from scratching the work.'

65. According to the caption for Figure 9-44, what feature of the fly cutter's cutting tool allows it to create either a straight or beveled edge?

It is adjustable It is reversible It is made of carbide It has a pilot

Explanation: The caption for Figure 9-44 states that 'the cutting tool is reversible in its holder so that the edge of the hole being cut can have either a straight or beveled edge.'

66. What is an important safety measure mentioned when operating a fly cutter?

Always use the highest drill press speed Ensure the cutter is well-oiled Back the metal with scrap wood firmly clamped to the table Reverse the direction of the drill press

Explanation: The text emphasizes that it is 'extremely important to back the metal being cut with scrap wood' and clamp it firmly to prevent the cutter from grabbing and spinning the workpiece.

67. How is the final depth of a countersunk hole properly set when using an adjustable stop countersink?

By measuring the length of the rivet head The depth is pre-set and cannot be changed By making trial cuts in scrap metal and adjusting the stop By tightening the locknut to its maximum

Explanation: The procedure described is to make 'trial holes...in scrap metal and the stop is adjusted until the diameter of the countersunk hole is correct for the rivet.'

68. Which component of the stop countersink assembly, shown in Figure 9-45, is used to secure the depth setting of the stop?

Pilot Body Cutter Locknut

Explanation: The locknut is a common mechanical component used to lock another part, in this case the adjustable 'Stop', in place once the desired depth is set, preventing it from moving during operation.

69. According to the text, why are reamers used after a hole has been drilled?

To create threads inside the hole. To make the hole smaller. Because drills cannot make holes with sufficient accuracy for certain applications. To create a tapered hole from a straight one.

Explanation: The first paragraph under 'REAMERS' states, 'Drills cannot make holes with sufficient accuracy for certain applications. However, if a hole is drilled undersized and then reamed to a finished size, extremely accurate hole sizes are obtained.'

70. What is the recommended pilot hole size for a reamer?

Exactly the same size as the reamer. 0.010 to 0.030 inch smaller than the reamer. 0.001 to 0.003 inch smaller than the reamer. Slightly larger than the reamer.

Explanation: The text mentions, 'When drilling a pilot hole for a reamer, the hole should be about 0.001 to 0.003 inch smaller than the reamer.'

71. Based on Figure 9-46 and its description, which type of reamer can be used to cut several different hole sizes?

Tapered Reamer (Straight Flutes) Bottoming Reamer Tapered Reamer (Spiral Flutes) Expansion Reamer

Explanation: The caption for Figure 9-46 states, '...with an expansion reamer several different size holes can be cut with the same reamer.'

72. What is the primary function of a tap?

To smooth and finish the inside of a hole. To cut threads on the inside of a hole. To measure the diameter of a hole. To create a perfectly round hole.

Explanation: The section on 'TAPS' begins by defining them: 'Taps are a form of cutting tool used to cut threads on the inside of a hole.'

73. Using the 'NATIONAL FINE THREAD SERIES' chart, what is the correct Tap Drill Size for a 1/4-28 thread?

F 1/4 #3 #21

Explanation: In the 'NATIONAL FINE THREAD SERIES' chart, find the row for '1/4-28' under the 'SIZE AND THREADS' column. The corresponding value in the 'TAP DRILL SIZE' column is '#3'.

74. According to the 'NATIONAL COARSE THREAD SERIES' chart, what is the Body Drill size for a 5/16-18 thread?

1/4 #F 5/16 U

Explanation: In the 'NATIONAL COARSE THREAD SERIES' chart, the row for '5/16-18' shows '5/16' in the 'BODY DRILL' column.

75. What is the correct procedure for removing a reamer from a hole to prevent it from getting dull?

Pull it straight out without turning. Turn it in the reverse direction while pulling. Continue to turn it in the cutting direction while removing it. Tap it gently with a hammer to loosen it first.

Explanation: The text explains, 'After the hole is reamed to the proper size, the reamer must continue to turn in the cutting direction to remove it from the hole.' It also warns that turning backward will dull the tool.

76. For a National Coarse thread size of 1/2-13, what is the required Tap Drill Size?

1/2 U 27/64 7/16

Explanation: Locate the '1/2-13' row in the 'NATIONAL COARSE THREAD SERIES' chart. The value in the 'TAP DRILL SIZE' column for this row is '27/64'.

77. What is the 'DIAMETER OF BODY FOR THREADS' for a 10-32 National Fine thread?

.164 .190 .216 #29

Explanation: On the 'NATIONAL FINE THREAD SERIES' chart, find the row for '10-32'. The value in the 'DIAMETER OF BODY FOR THREADS' column is '.190'.

78. What materials are taps most commonly made from, according to the text?

Aluminum and brass Low carbon steel High carbon steel or high speed steel Tungsten carbide

Explanation: Under the 'TAPS' section, the text states, '...some are made of high carbon steel or high speed steel, while others contain special alloys.'

79. According to the text, what are the three most commonly used taps in aviation maintenance?

A. Tapered tap, plug tap, and bottoming tap B. Hand tap, machine tap, and forming tap C. Straight flute, spiral point, and spiral flute tap D. Thread restorer, thread chaser, and die tap

Explanation: The first sentence of the text explicitly lists the three most common taps as the taper tap, the plug tap, and the bottoming tap. Figure 9-48 also provides illustrations of these three types.

80. Which tap is specifically designed to cut full threads to the bottom of a blind hole?

A. Taper tap B. Plug tap C. Bottoming tap D. Die tap

Explanation: The text states, 'The bottoming tap is not tapered and is used to cut full threads to the bottom of a blind hole.'

81. What is the primary function of a threading die?

A. To cut internal threads in a pre-drilled hole. B. To clean and restore damaged internal threads. C. To measure the pitch and diameter of existing threads. D. To cut external threads on rods, bolts, and pipes.

Explanation: The first sentence under the 'DIES' section clearly defines their purpose: 'Threading dies are used to cut threads on the outside of rods, bolts, and pipes.'

82. As shown in Figure 9-50, which type of die is used to cut new threads and must be held in a die stock?

A. The hexagonal die (A) B. The round split die (B) C. The thread chaser D. The rethreading die

Explanation: The caption for Figure 9-50 states that the round split die (B) 'is used to cut new threads and must be held in a die stock.'

83. Why is a standard wrench generally not recommended for turning a tap?

A. It does not provide sufficient torque. B. It is difficult to apply even pressure, which can lead to a crooked hole. C. It is slower to use than a T-handle or solid handle. D. It can damage the cutting threads of the tap.

Explanation: The text explains that 'A wrench is usually not used to turn a tap because pressure cannot be applied evenly to both sides of the tap, making it difficult to tap a straight hole.'

84. Which tap is used to begin the tapping process and is tapered for the first six to seven threads?

A. Bottoming tap B. Plug tap C. Taper tap D. Starter tap

Explanation: The text specifies that 'The taper tap is used to begin the tapping process, because it is tapered back for six to seven threads.'

85. The solid hexagonal die, often turned with a wrench, is also known as what?

A. A tap wrench or die stock B. A round split die or adjustable die C. A thread restorer or thread chaser D. A cutting die or finishing die

Explanation: Under the 'DIES' section, the text states that the solid hexagonal rethreading die 'is sometimes called a thread restorer, or thread chaser.'

86. What is the key technique mentioned for using either the T-handle or solid handle to turn a tap?

A. To apply rapid, short turns. B. To apply pressure on one side only for better control. C. To apply even pressure to both sides of the handle. D. To use cutting fluid only after the first few threads are cut.

Explanation: The caption for Figure 9-49 explicitly instructs to 'make sure to apply even pressure to both sides of the handle.'

87. Which tap is described as supplementing the taper tap and is tapered for only the first three to five threads?

A. The bottoming tap B. The plug tap C. The rethreading tap D. The die tap

Explanation: The text states, 'The plug tap supplements the taper tap for tapping holes in thick stock, but tapers for only the first three to five threads.'

88. What is the purpose of the adjusting screw on a round split die?

A. To secure the die into the die stock. B. To eject metal chips from the die. C. To make small adjustments for the class of fit desired. D. To change the thread pitch.

Explanation: The text explains that 'Most round dies have an adjusting screw that allows you to make small adjustments depending on the class of fit desired,' leading to a looser or tighter fit.