Metalworking Occupations Mid-term Exam
This exam covers basic machine shop practices. Content areas are listed below. Measurement Layout Machine Speeds Drilling Screw threads Lathe work Milling
Questions and Answers
- 1.
Identify the following tool.
- A.
Vernier caliper
- B.
Depth micrometer
- C.
Outside micrometer
Correct Answer
C. Outside micrometerExplanation
The given tool is an outside micrometer. This tool is used to measure the external dimensions of objects with high accuracy. It consists of a frame, an anvil, a spindle, and a thimble. The anvil is placed against one end of the object being measured, and the spindle is moved towards the other end using the thimble. The measurement is read from the scale on the thimble and the main scale on the frame. The outside micrometer is commonly used in industries such as manufacturing, engineering, and machining.Rate this question:
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- 2.
Identify the following tool.
- A.
Divider
- B.
Combination Square
- C.
Height gage
Correct Answer
B. Combination SquareExplanation
A combination square is a versatile measuring tool that combines multiple functions in one tool. It typically consists of a ruler, a square head, and a center head. The ruler can be used for measuring lengths, while the square head is used for marking and checking 90-degree angles. The center head is used for finding the center of round objects. Overall, a combination square is a useful tool for both measuring and marking tasks in woodworking, metalworking, and other trades.Rate this question:
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- 3.
Identify this tool which is used to scribe circles, arcs, and radii.
- A.
Divider
- B.
Combination Square
- C.
Height gage
Correct Answer
A. DividerExplanation
A divider is a tool used to scribe circles, arcs, and radii. It consists of two pointed legs joined by a hinge. By adjusting the distance between the legs, the divider can be used to mark out precise measurements and create accurate curves. The sharp points allow for precise marking on various materials, making it a versatile tool for carpentry, metalworking, and other trades.Rate this question:
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- 4.
Identify the following tool.
- A.
Electronic Digital Caliper
- B.
Electronic edge finder
- C.
Electronic Indicator
Correct Answer
A. Electronic Digital CaliperExplanation
The correct answer is Electronic Digital Caliper. This tool is used for measuring the distance between two opposing sides of an object with high precision. It has a digital display that shows the measurement in either metric or imperial units. The electronic feature allows for easy and accurate readings, making it a popular tool in various industries such as manufacturing, engineering, and woodworking.Rate this question:
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- 5.
Which of the following tools would be used for basic hole layout work.
- A.
Protractor, scriber, & center drill.
- B.
Edgefinder, scriber, & live center
- C.
Combination square, scriber,& center punch
Correct Answer
C. Combination square, scriber,& center punchExplanation
A combination square is a versatile tool that can be used for measuring and marking angles, as well as checking the accuracy of right angles. A scriber is a sharp-pointed tool used for marking lines on a surface, such as metal or wood. A center punch is used to make a small indentation in a workpiece, which serves as a starting point for drilling or other operations. Therefore, the combination square, scriber, and center punch are the most suitable tools for basic hole layout work.Rate this question:
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- 6.
Which of the following tools will produce an internal thread?
- A.
Tap
- B.
Die
- C.
Reamer
Correct Answer
A. TapExplanation
A tap is a tool used to create internal threads in a hole or a nut. It is designed with sharp cutting edges that remove material and form the threads as it is turned into the hole or nut. Therefore, a tap is the correct tool for producing an internal thread. A die, on the other hand, is used to create external threads, while a reamer is used to smooth and enlarge holes, not to create threads.Rate this question:
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- 7.
A small double ended drill used to start a hole is called a
- A.
Pilot drill
- B.
Center drill
- C.
Taper shank drill
Correct Answer
B. Center drillExplanation
A center drill is a small double-ended drill that is used to start a hole. It is designed to create a small indentation or pilot hole in the material, which helps to guide the larger drill bit and prevent it from wandering or slipping off center. Center drills are commonly used in metalworking and woodworking applications to ensure accurate and precise hole placement.Rate this question:
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- 8.
When preparing to produce internal threads, a hole which is __________________ the major diameter of the thread should be drilled first.
- A.
Slightly larger than
- B.
Slightly smaller than
- C.
The same size as
Correct Answer
B. Slightly smaller thanExplanation
When preparing to produce internal threads, a hole that is slightly smaller than the major diameter of the thread should be drilled first. This is because the internal threads will be formed by tapping or cutting into the hole, and if the hole is the same size or larger than the major diameter, there will be no material left to form the threads. By drilling a hole slightly smaller than the major diameter, there will be enough material for the threads to be formed properly.Rate this question:
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- 9.
In the following thread information what does the first number represent? 1/4 - 20 UNC
- A.
The major diameter of the thread is .250 inch
- B.
There are 14 threads per inch
- C.
A 1/4" diameter hole should be drilled
Correct Answer
A. The major diameter of the thread is .250 inchExplanation
The first number in the thread information represents the major diameter of the thread, which is .250 inch.Rate this question:
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- 10.
What is the decimal equivalent of 23/64?
- A.
.3281
- B.
.3906
- C.
.3594
Correct Answer
C. .3594Explanation
The decimal equivalent of a fraction is obtained by dividing the numerator by the denominator. In this case, dividing 23 by 64 gives a decimal value of approximately 0.3594.Rate this question:
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- 11.
What is the fractional equivalent of .6250?
- A.
1/16
- B.
9/16
- C.
5/8
Correct Answer
C. 5/8Explanation
The fractional equivalent of .6250 is 5/8. This can be determined by recognizing that the decimal .6250 represents 6250/10000, which can be simplified to 5/8 by dividing both the numerator and denominator by 1250.Rate this question:
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- 12.
Which drill bit has the largest diameter?
- A.
Number 10
- B.
Letter A
- C.
15/64
Correct Answer
C. 15/64Explanation
The answer 15/64 is the largest diameter among the given options. The other options, Number 10 and Letter A, do not provide specific measurements or units of diameter. Therefore, 15/64 is the correct answer as it represents a specific measurement of diameter.Rate this question:
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- 13.
What size tap drill is used for a 1/4 - 20 UNC thread.
- A.
1/4
- B.
Number 7
- C.
Number 3
Correct Answer
B. Number 7Explanation
The correct answer is Number 7. In the Unified National Coarse (UNC) thread system, a 1/4 - 20 thread refers to a 1/4 inch diameter bolt with 20 threads per inch. To tap a hole for this thread, a Number 7 tap drill size is used. The tap drill size is slightly smaller than the bolt diameter to create the correct thread size and ensure proper engagement between the bolt and the tapped hole.Rate this question:
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- 14.
What size tap drill is used for a 3/8 - 24 UNF thread?
- A.
5/16
- B.
Letter Q
- C.
3/8
Correct Answer
B. Letter QExplanation
The correct answer is "Letter Q". In the Unified National Fine (UNF) thread system, the tap drill size for a 3/8-24 UNF thread is determined by the letter Q. The letter Q corresponds to a tap drill size of 0.332 inches.Rate this question:
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- 15.
Which tool is used to de-burr holes?
- A.
Countersink
- B.
Counterbore
- C.
Counter balance
Correct Answer
A. CountersinkExplanation
A countersink tool is used to de-burr holes. It is designed to create a conical recess in the surface of a material, allowing the screw or bolt to sit flush with the surface. This helps to prevent any sharp edges or burrs from forming around the hole, ensuring a smooth and clean finish. Counterbore, on the other hand, is used to create a flat-bottomed hole with a larger diameter than the screw head, and counterbalance is unrelated to the process of de-burring holes.Rate this question:
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- 16.
Which tool is used to create a square bottomed hole for the head of a bolt to fit in?
- A.
Countersink
- B.
Counterbore
- C.
Counter balance
Correct Answer
B. CounterboreExplanation
A counterbore is a tool that is used to create a square bottomed hole for the head of a bolt to fit in. This tool is specifically designed to enlarge the top portion of a hole, allowing the head of a bolt to sit flush with or below the surface of the material being drilled. It creates a flat-bottomed recess that provides a secure and stable fit for the bolt head, ensuring that it does not protrude or interfere with the surrounding surface. Counterboring is commonly used in woodworking, metalworking, and other industries where bolts need to be securely fastened.Rate this question:
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- 17.
What is the reading on the outside micrometer shown below?
- A.
.244
- B.
.231
- C.
.256
Correct Answer
C. .256 -
- 18.
What is the reading on the outside micrometer shown below?
- A.
.430
- B.
.455
- C.
.405
Correct Answer
A. .430Explanation
The reading on the outside micrometer shown below is .430.Rate this question:
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- 19.
The lathe operation which cuts across the end of the workpiece is called ___________ .
- A.
Turning
- B.
Surfacing
- C.
Facing
Correct Answer
C. FacingExplanation
Facing is the correct answer because it refers to the lathe operation where the cutting tool moves perpendicular to the axis of rotation of the workpiece, resulting in a smooth and flat surface being created across the end of the workpiece. This operation is commonly used to create a precise and flat surface for mating or joining with another component.Rate this question:
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- 20.
The lathe operation which cuts along the outside diameter of the workpiece is called _______________ .
- A.
Turning
- B.
Surfacing
- C.
Facing
Correct Answer
A. TurningExplanation
Turning is the correct answer because it refers to the lathe operation that cuts along the outside diameter of the workpiece. This operation involves the rotation of the workpiece on its axis while a cutting tool removes material from the outer surface. Turning is commonly used to create cylindrical shapes, such as shafts or cylinders, and to achieve a smooth and precise finish on the workpiece.Rate this question:
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- 21.
One methof for cutting a taper or angle on a part in the lathe is to use the ______________ .
- A.
Compound Rest
- B.
Head Stock
- C.
Half Nut Lever
Correct Answer
A. Compound RestExplanation
The compound rest is used for cutting a taper or angle on a part in the lathe. It is a tool that can be adjusted and set at different angles to the workpiece, allowing the cutting tool to be positioned at the desired angle. By adjusting the compound rest, the operator can control the depth and direction of the cut, resulting in a taper or angle on the part.Rate this question:
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- 22.
A diamond shaped surface which produces a better grip on handles is produced with a _______________ .
- A.
Parting tool
- B.
Reamer
- C.
Knurling tool
Correct Answer
C. Knurling toolExplanation
A knurling tool is used to create a diamond-shaped pattern on a surface, which enhances grip. This tool has a set of hardened wheels with diagonal teeth that press against the workpiece, creating the desired pattern. The diamond-shaped surface produced by the knurling tool provides better traction and grip on handles, making it the correct tool for this purpose.Rate this question:
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- 23.
Drill chucks, live centers, and other taper shank tools are held in the ____________ .
- A.
Head stock
- B.
Tail stock
- C.
Tool post
Correct Answer
B. Tail stockExplanation
The tail stock is used to hold taper shank tools such as drill chucks and live centers. It is located on the opposite end of the headstock in a lathe machine. The tail stock provides support and stability to the workpiece while it is being machined. It can be adjusted to accommodate different lengths of tools and workpieces.Rate this question:
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- 24.
Identify this common cutting tool used in a milling machine.
- A.
Indexable carbide insert end mill
- B.
Two flute end mill
- C.
Four flute end mill
Correct Answer
B. Two flute end millExplanation
A two flute end mill is a common cutting tool used in a milling machine. It has two cutting edges or flutes that remove material as the mill rotates. This type of end mill is often used for general milling operations and is suitable for cutting softer materials. The two flutes help to provide a good balance between material removal and chip evacuation, resulting in efficient and smooth cutting.Rate this question:
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- 25.
After mounting a vise on the milling machine the back jaw of the vise should be aligned with the table using an _______ .
- A.
Indicator
- B.
Edge finder
- C.
Electronic caliper
Correct Answer
A. IndicatorExplanation
After mounting a vise on the milling machine, it is important to align the back jaw of the vise with the table to ensure accurate and precise machining. An indicator is commonly used for this purpose. The indicator helps in measuring and detecting any misalignment between the vise and the table. By using the indicator, the operator can adjust the vise position until the back jaw is perfectly aligned with the table, ensuring proper machining operations.Rate this question:
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- 26.
A vertical milling machine has three movements: Vertical (up & down) , longitudinal (left & right), and cross (front to back). Each axis is given a letter to describe it. X, Y, & Z Which letter is assigned to the left and right movement of the table?
- A.
X axis
- B.
Y axis
- C.
Z axis
Correct Answer
A. X axisExplanation
The X axis is assigned to the left and right movement of the table in a vertical milling machine.Rate this question:
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- 27.
Identify the tool shown below.
- A.
Inside micrometer
- B.
Depth micrometer
- C.
Indicator micrometeer
Correct Answer
B. Depth micrometerExplanation
The tool shown in the image is a depth micrometer. This type of micrometer is specifically designed to measure the depth of holes, slots, or recesses. It consists of a base that rests on the surface being measured and a rod with a measuring face that extends into the hole or recess. The measurement is taken by reading the scale on the barrel of the micrometer, which indicates the depth of the feature being measured.Rate this question:
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- 28.
The precise location of holes can be done on a milling machine by using an ______________ to establish where the edge of the part is.
- A.
Combination square
- B.
Edge finder
- C.
Electronic caliper
Correct Answer
B. Edge finderExplanation
An edge finder is a tool used on a milling machine to accurately determine the location of the edge of a part. It works by touching the edge of the part with a probe, which then sends a signal to the machine, indicating the exact position of the edge. This information is crucial for accurately positioning and drilling holes in the part. A combination square and electronic caliper are not specifically designed for this purpose and would not provide the same level of precision in locating the edge of the part.Rate this question:
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- 29.
At what speed (rpm) must a 1/2" diameter high speed steel drill rotate when drilling aluminum. Use the following formula. RPM = Cutting Speed x 4 / Diameter of drill or milling Cutter Available information:
- Cutting speed for aluminum = 400
- Diameter of drill = 1/2" (.500)
- A.
400 rpm
- B.
1600 rpm
- C.
3200 rpm
Correct Answer
C. 3200 rpmExplanation
The formula given is used to calculate the RPM (rotation per minute) required for drilling aluminum. The cutting speed for aluminum is given as 400. The diameter of the drill is given as 1/2" or 0.500. Plugging these values into the formula, we get: RPM = 400 x 4 / 0.500 = 3200. Therefore, the correct answer is 3200 rpm.Rate this question:
- 30.
At what speed (rpm) should a lathe be set at when turning down a 2 inch diameter piece of low carbon steel with a carbide cutter? RPM = Cutting Speed x 4 / Diameter of the workpiece. Available information:
- Cutting speed for low carbon steel with a carbide tool = 350
- A.
700 rpm
- B.
350 rpm
- C.
1400 rpm
Correct Answer
A. 700 rpmExplanation
The formula given for calculating RPM states that RPM is equal to cutting speed multiplied by 4, divided by the diameter of the workpiece. In this case, the cutting speed for low carbon steel with a carbide tool is given as 350. The diameter of the workpiece is 2 inches. Plugging these values into the formula, we get 350 x 4 / 2 = 700. Therefore, the lathe should be set at 700 RPM when turning down a 2 inch diameter piece of low carbon steel with a carbide cutter.Rate this question:
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