Pt -2 Quiz 2
Dear Students,
plz fill complete and correct details before starting the quiz. This quiz contains 20 questions and time given is 10 minutes.
Quiz will start at 9 PM on 19 Nov 2019 and finish at 9 30 PM
You can attempt only for one time.
Questions and Answers
- 1.
In metal cutting, use of low feeds and high cutting speeds is desired when the objective is
- A.
(A) High metal removal rate
- B.
(B) Dry machining
- C.
(C) Use of soft cutting tool
- D.
(D) Surface finish
Correct Answer
D. (D) Surface finishExplanation
In metal cutting, the use of low feeds and high cutting speeds is desired when the objective is to achieve a good surface finish. Low feeds help to reduce the depth of cut, resulting in a smoother surface. High cutting speeds help to minimize the formation of built-up edge and reduce the chances of work hardening, which can negatively impact the surface finish. Therefore, option (D) is the correct answer.Rate this question:
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- 2.
In order to achieve a specific surface finish in single point turning, the most important factor to be controlled is
- A.
(A) Depth of cut
- B.
(B) Cutting speed
- C.
(C) Feed
- D.
(D) Tool rake angle
Correct Answer
B. (B) Cutting speedExplanation
The most important factor to be controlled in order to achieve a specific surface finish in single point turning is the cutting speed. Cutting speed refers to the speed at which the workpiece is rotated during the turning process. It determines the rate at which the tool cuts into the workpiece material. By controlling the cutting speed, the surface finish can be controlled as well. Higher cutting speeds result in a smoother surface finish, while lower cutting speeds may result in a rougher surface finish. Therefore, the cutting speed is crucial in achieving the desired surface finish in single point turning.Rate this question:
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- 3.
A lathe with four steps on the cone pulley and with back-gears will have
- A.
(A) Four direct speeds
- B.
(B) Four indirect speeds
- C.
(C) Four direct and four indirect speeds
- D.
(D) Eight indirect speeds
Correct Answer
C. (C) Four direct and four indirect speedsExplanation
A lathe with four steps on the cone pulley and with back-gears will have four direct speeds because each step on the cone pulley corresponds to a different speed setting. Additionally, it will also have four indirect speeds because the back-gears allow for further speed variations by changing the gear ratios. Therefore, the lathe will have a total of eight speed options, four direct and four indirect speeds.Rate this question:
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- 4.
The relation between the tool life (T) in minutes and cutting speed (V) in m/min is (where n = An exponent, which depends upon the tool and workpiece, and C = A constant)
- A.
(A) VnT = C
- B.
(B) VTn = C
- C.
(C) Vn/T = C
- D.
(D) V/Tn = C
Correct Answer
B. (B) VTn = CExplanation
The correct answer is (B) VTn = C. This equation represents the relation between tool life (T) and cutting speed (V) with an exponent (n) and a constant (C). It suggests that the tool life is directly proportional to the cutting speed raised to the power of n. This means that as the cutting speed increases, the tool life decreases exponentially. The constant C represents the specific values for the tool and workpiece being used.Rate this question:
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- 5.
The vector sum of cutting velocity and chip velocity is __________ shear velocity.
- A.
(A) Equal to
- B.
(B) Less than
- C.
(C) More than
- D.
(D) None of these
Correct Answer
A. (A) Equal toExplanation
The vector sum of cutting velocity and chip velocity is equal to shear velocity. This means that when the cutting velocity and chip velocity are combined, they result in the shear velocity.Rate this question:
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- 6.
The angle made by the face of the tool and the plane parallel to the base of cutting tool is called
- A.
(A) Rake angle
- B.
(B) Cutting angle
- C.
(C) Clearance angle
- D.
(D) Lip angle
Correct Answer
A. (A) Rake angleExplanation
The angle made by the face of the tool and the plane parallel to the base of the cutting tool is called the rake angle. This angle is important in determining the efficiency of the cutting process. A positive rake angle means that the face of the tool slopes away from the cutting edge, allowing for a more efficient cutting action. A negative rake angle means that the face of the tool slopes towards the cutting edge, which can lead to a stronger cutting edge but may require more power to cut. The rake angle is an important factor in achieving the desired cutting results.Rate this question:
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- 7.
It is desired to perform the operations like drilling, reaming, counter-boring etc. on a work piece. Which of the following machine will be used?
- A.
(A) Sensitive drilling machine
- B.
(B) Radial drilling machine
- C.
(C) Gang drilling machine
- D.
(D) Multiple spindle drilling machine
Correct Answer
C. (C) Gang drilling machineExplanation
A gang drilling machine is used to perform multiple drilling operations simultaneously on a work piece. It consists of multiple drill heads mounted on a single base, allowing for efficient and quick drilling of multiple holes at once. This makes it suitable for operations like drilling, reaming, counter-boring, etc. Therefore, a gang drilling machine would be the appropriate choice for performing these operations on a work piece.Rate this question:
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- 8.
The correct sequence of the following parameters in order of their maximum to minimum influence on tool life is
- A.
(A) Feed rate, depth of cut, cutting speed
- B.
(B) Depth of cut, cutting speed, feed rate
- C.
(C) Cutting speed, feed rate, depth of cut
- D.
(D) Feed rate, cutting speed, depth of cut
Correct Answer
C. (C) Cutting speed, feed rate, depth of cutExplanation
The correct answer is (C) Cutting speed, feed rate, depth of cut. This means that cutting speed has the maximum influence on tool life, followed by feed rate, and then depth of cut. This is because cutting speed refers to the speed at which the tool is moving across the workpiece, and a higher cutting speed can cause more heat and wear on the tool, reducing its life. Feed rate refers to the speed at which the workpiece is being fed into the tool, and a higher feed rate can also increase the wear on the tool. Depth of cut refers to the amount of material being removed in each pass, and while it can affect tool life, it has a lesser influence compared to cutting speed and feed rate.Rate this question:
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- 9.
In a center lathe, the cutting tool is fed in _________ with reference to the lathe axis.
- A.
(A) Cross direction only
- B.
(B) Longitudinal direction only
- C.
(C) Both cross and longitudinal direction
- D.
(D) Any direction
Correct Answer
C. (C) Both cross and longitudinal directionExplanation
In a center lathe, the cutting tool is fed in both cross and longitudinal directions with reference to the lathe axis. This means that the tool can move both perpendicular to and parallel to the lathe axis. This allows for a wide range of cutting operations to be performed on the workpiece, including facing, turning, and threading. The ability to feed the cutting tool in both directions gives the lathe operator greater control and flexibility in shaping the workpiece.Rate this question:
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- 10.
Any number of equal divisions can be obtained on milling machine by
- A.
(A) Direct indexing
- B.
(B) Simple indexing
- C.
(C) Compound indexing
- D.
(D) Differential indexing
Correct Answer
B. (B) Simple indexingExplanation
Simple indexing refers to the process of dividing the workpiece into equal divisions by directly using the indexing mechanism of the milling machine. This can be done by using a dividing head or an indexing fixture. The workpiece is rotated by a certain angle for each division, allowing for the creation of any number of equal divisions. This method is commonly used in milling operations to produce accurate and precise cuts on the workpiece. Therefore, the correct answer is (B) Simple indexing.Rate this question:
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- 11.
The tool life is affected by
- A.
(A) Depth of cut
- B.
(B) Cutting speed
- C.
(C) Feed
- D.
(D) All of these
Correct Answer
D. (D) All of theseExplanation
The tool life is affected by the depth of cut, cutting speed, and feed. These factors directly impact the wear and tear on the cutting tool during the machining process. A deeper cut puts more stress on the tool, causing it to wear out faster. Similarly, a higher cutting speed increases the temperature and friction, leading to faster tool deterioration. The feed rate also affects tool life as a higher feed rate can cause more abrasion and chipping. Therefore, all of these factors play a significant role in determining the tool life.Rate this question:
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- 12.
Hard and tough materials like cast iron should be turned at
- A.
(A) Slow speed
- B.
(B) High speed
- C.
(C) Any speed
- D.
(D) Certain specific speed
Correct Answer
A. (A) Slow speedExplanation
Hard and tough materials like cast iron should be turned at a slow speed because they are more resistant to cutting and require more force to remove material. Turning at a slow speed allows for better control and reduces the risk of overheating or damaging the material. High speeds can cause excessive heat generation, leading to tool wear and poor surface finish. Certain specific speeds may be recommended for specific operations, but in general, a slow speed is preferred for hard and tough materials like cast iron.Rate this question:
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- 13.
The effect of setting a boring tool above center height leads to
- A.
(A) Increase in the effective rake angle and a decrease in the effective clearance angle
- B.
(B) Increase in both effective rake angle and effective clearance angle
- C.
(C) Decrease in the effective rake angle and an increase in the effective clearance angle
- D.
(D) Decrease in both effective rake angle and effective clearance angle
Correct Answer
A. (A) Increase in the effective rake angle and a decrease in the effective clearance angleExplanation
Setting a boring tool above center height will result in an increase in the effective rake angle and a decrease in the effective clearance angle. This is because when the tool is above center height, it will have a greater cutting force, causing the tool to dig into the workpiece more aggressively. This increased cutting force leads to a higher rake angle, which improves cutting efficiency. At the same time, the decreased clearance angle allows the tool to maintain a closer contact with the workpiece, resulting in better chip evacuation and preventing the tool from rubbing against the workpiece.Rate this question:
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- 14.
The machining of titanium is difficult due to
- A.
(A) High thermal conductivity of titanium
- B.
(B) Chemical reaction between tool and work
- C.
(C) Low tool-chip contact area
- D.
(D) None of these
Correct Answer
C. (C) Low tool-chip contact areaExplanation
The machining of titanium is difficult due to low tool-chip contact area. This means that there is limited surface area where the tool and the workpiece come into contact during the machining process. This leads to higher cutting forces and temperatures, which can cause tool wear and damage. Additionally, the low tool-chip contact area can result in poor chip evacuation, leading to chip buildup and further complications in the machining process.Rate this question:
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- 15.
The size of a lathe is specified by the
- A.
(A) Length between centers
- B.
(B) Swing diameter over the bed
- C.
(C) Swing diameter over the carriage
- D.
(D) All of these
Correct Answer
D. (D) All of theseExplanation
The size of a lathe is determined by multiple factors. The length between centers refers to the maximum length of the workpiece that can be accommodated on the lathe. The swing diameter over the bed refers to the maximum diameter of a workpiece that can be rotated on the lathe over the bed. The swing diameter over the carriage refers to the maximum diameter of a workpiece that can be rotated on the lathe over the carriage. Therefore, all of these factors contribute to determining the size of a lathe.Rate this question:
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- 16.
Which of the following statement is wrong?
- A.
(A) The larger side rake angle produces chipping
- B.
(B) The smaller rake angle produces excessive wear and deformation in tool
- C.
(C) The side cutting edge angle (less than 15°) increases tool life
- D.
(D) The increase in nose radius decreases tool life
Correct Answer
D. (D) The increase in nose radius decreases tool lifeExplanation
The increase in nose radius actually increases tool life by reducing the stress concentration at the cutting edge and improving the tool's ability to withstand heat and wear.Rate this question:
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- 17.
A single point thread cutting tool should ideally have
- A.
(A) Zero rake angle
- B.
(B) Positive rake angle
- C.
(C) Negative rake angle
- D.
(D) Point angle
Correct Answer
A. (A) Zero rake angleExplanation
A single point thread cutting tool should ideally have zero rake angle because it allows for better chip formation and reduces the cutting forces. Zero rake angle means that the cutting edge is perpendicular to the direction of cutting, which helps in achieving a clean and accurate thread profile. Positive rake angle would cause the tool to dig into the material, leading to poor surface finish and increased cutting forces. Negative rake angle would make the tool more prone to chipping and breakage. Point angle, on the other hand, refers to the angle at the tip of the tool and is not directly related to the rake angle.Rate this question:
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- 18.
In which of the following machine, the work rotates and the tool is stationary?
- A.
(A) Vertical boring machine
- B.
(B) Horizontal boring machine
- C.
(C) Precision boring machine
- D.
(D) Jig boring machine
Correct Answer
A. (A) Vertical boring machineExplanation
In a vertical boring machine, the workpiece rotates while the tool remains stationary. This allows for precise and accurate drilling or boring operations to be performed on the workpiece. The vertical orientation of the machine also allows for easy access and visibility of the workpiece, making it suitable for large and heavy workpieces. Horizontal boring machines, on the other hand, have a stationary workpiece and a rotating tool. Precision boring machines and jig boring machines can have either a rotating workpiece or a rotating tool, depending on the specific design and application.Rate this question:
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- 19.
In drilling aluminum, a drill with
- A.
(A) Zero helix angle is used
- B.
(B) Low helix angle is used
- C.
(C) High helix angle is used
- D.
(D) Any helix angle can be used
Correct Answer
C. (C) High helix angle is usedExplanation
In drilling aluminum, a high helix angle is used. This is because aluminum is a soft material and has a tendency to stick to the drill bit. A high helix angle helps to reduce the friction between the drill bit and the aluminum, preventing the material from sticking and allowing for smoother drilling. Additionally, a high helix angle helps to evacuate chips more efficiently, preventing clogging and improving the overall drilling process.Rate this question:
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- 20.
The operation performed on a shaper is
- A.
(A) Machining horizontal surface
- B.
(B) Machining vertical surface
- C.
(C) Machining angular surface
- D.
(D) All of these
Correct Answer
D. (D) All of theseExplanation
The correct answer is (D) All of these. A shaper is a machine tool used for shaping or machining different types of surfaces. It can be used to machine horizontal surfaces, vertical surfaces, and angular surfaces. Therefore, all of these operations can be performed on a shaper.Rate this question:
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Mar 19, 2023Quiz Edited by
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Nov 19, 2019Quiz Created by
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