CNC Machining: Length to Diameter (L/D) Ratio Quiz
Grade Level: 6th Grade Science/Technology
Multiple Choice Quiz
1. What does L/D ratio mean in CNC machining?
A) Length divided by diameter of a workpiece or tool
B) The weight of a machine part
C) The color of the cutting tool
D) The speed of the machine
2. As the L/D ratio increases, what happens to the workpiece's stability?
A) It becomes more stable
B) It becomes less stable and more likely to bend
C) It stays exactly the same
D) It changes color
3. How does bending relate to the L/D ratio?
A) Bending increases linearly with L/D
B) Bending increases exponentially with (L/D)²
C) Bending has no relationship to L/D
D) Bending only happens in small tools
4. What is a potential consequence of high L/D ratios?
A) Improved surface quality
B) Increased machine speed
C) Increased vibration and chatter
D) Cheaper machining costs
5. When L/D ratio is high, what typically happens to cutting speeds?
A) They increase dramatically
B) They remain constant
C) They must be reduced to maintain stability
D) They become irrelevant
6. Why might a high L/D ratio increase the risk of tool breakage?
A) Tools become heavier
B) Chip evacuation becomes more difficult
C) Tools become more colorful
D) Machines run faster
7. The relationship between L/D ratio and deflection can be described as:
A) Constant
B) Linear
C) Exponential
D) Random
8. What does increased L/D ratio typically mean for machining accuracy?
A) Accuracy improves
B) Accuracy remains unchanged
C) Accuracy becomes more challenging to maintain
D) Accuracy is not affected
9. In CNC turning, the L/D ratio helps determine:
A) The color of the workpiece
B) The work holding method
C) The machine's electricity consumption
D) The tool's weight
10. When the L/D ratio increases, cutting forces:
A) Decrease significantly
B) Remain constant
C) Increase and become more challenging to control
D) Become irrelevant
Answer Key:
1. A
2. B
3. B
4. C
5. C
6. B
7. C
8. C
9. B
10. C
Scoring:
9-10 correct: Excellent CNC Understanding!
7-8 correct: Great Job!
5-6 correct: Good Start
0-4 correct: More Learning Needed
CNC Theory & MCQ English Book
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