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1
The carbide tools operating at very low cutting speeds (below 30 m/min)
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Answer & Solution
Answer: Option A
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2
The type of reamer used for reaming operation in a blind hole, is
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Answer & Solution
Answer: Option C
Solution:
Right hand spiral reamers should be selected for blind holes.
- Additionally a right hand spiral also helps bridge interruptions such as cross-holes or keyways.
- A right hand spiral reamer may cut slightly oversized holes due to the aggressive flute geometry.
- They perform very well in highly ductile materials.
3
Stellite preserves hardness up to a temperature of
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Answer & Solution
Answer: Option D
Solution:
Stellite alloys are composed of various amounts of cobalt, nickel, iron, aluminium, boron, carbon, chromium, manganese, molybdenum, phosphorus, sulfur, silicon, and titanium. Stellite preserves hardness up to a temperature of 1100°C
4
High speed steel tools retain their hardness up to a temperature of
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Answer & Solution
Answer: Option D
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5
For machining a mild steel workpiece using carbide tool, the maximum material will be removed at a temperature of
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Answer: Option B
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6
In a CNC program block, N002 GO2 G91 X40 Z40......, GO2 and G91 refer to
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Answer & Solution
Answer: Option C
Solution:
G02 – Circular interpolation in a clockwise direction
G91 – incremental dimension
7
In an interchangeable assembly, shafts of size 25.000 -0.0100⁺⁰∙⁰⁴⁰ mm mate with holes of size 25.000 -0.010⁺⁰∙⁰²⁰ mm. The maximum possible clearance in the assembly will be
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Answer & Solution
Answer: Option C
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8
In determining the various forces on the chip, Merchant assumed that the
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Answer & Solution
Answer: Option D
Solution:
Assumption in Merchant's Force Circle:
- The chip is considered in equilibrium under action of two equal and opposite collinear forces.
-The stress is maximum at the shear plane and it remains constant.
- The shear takes place in a direction in which the energy required for shearing is minimum
9
In order to achieve a specific surface finish in single point turning, the most important factor to be controlled is
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Answer & Solution
Answer: Option B
Solution:
In order to achieve a specific surface finish in single-point turning, the most important factor to be controlled is Cutting Speed
other parameters will impact on the surface finish:
-Minimize Deflection and Chatter, Keeping Tool Rigidity Up
-Use Balanced Tooling to Reduce Vibration
-Minimize Runout
10
The factor responsible for the formation of continuous chips with built up edge is
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Answer & Solution
Answer: Option B
Solution:
-continuous chip with built up edge. a built up edge (BUE) is an accumulation of material against the rake face, that seizes to the tool tip, separating it from the chip - Discontinuous chips are formed during machining of brittle metals while continuous chips with built up edge are formed during machining of ductile materials at low cutting speed