The relation between tool life (T) and cutting speed (V) is VTn = Constant. In this relation, the value of n depends upon
A. Work material
B. Tool material
C. Working conditions
D. Type of chip produced
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In machining metals, chips break due to __________ of work material.
A. Toughness
B. Ductility
C. Elasticity
D. Work hardening
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As the cutting speed increases, the tool cutting forces
A. Remain constant
B. Increases
C. Decreases
D. First increases and then decreases
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In which of the following machine, the work rotates and the tool is stationary?
A. Vertical boring machine
B. Horizontal boring machine
C. Precision boring machine
D. Jig boring machine
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During the execution of a CNC part program block NO20 GO2 X45.0 Y25.0 R5.0 ; the type of tool motion will be
A. Circular Interpolation − clockwise
B. Circular Interpolation − counter clockwise
C. Linear Interpolation
D. Rapid feed
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In order to prevent tool from rubbing the work _________ on tools are provided.
A. Rake angles
B. Relief angles
C. Face angles
D. None of these
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Carbide tipped tools usually have
A. Negative rake angle
B. Positive rake angle
C. Any rake angle
D. No rake angle
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The advantage of a broaching operation is that
A. Rate of production is very high
B. High accuracy and high class of surface finish is possible
C. Roughing and finishing cuts are completed in one pass of the tool
D. All of the above
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Shrinkage allowance on pattern is provided to compensate for shrinkage when
A. The temperature of liquid metal drops from pouring to freezing temperature
B. The metal changes from liquid to solid state at freezing temperature
C. The temperature of solid phase drops from freezing to room temperature
D. The temperature of metal drops from pouring to room temperature
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Hard and tough materials like cast iron should be turned at
A. Slow speed
B. High speed
C. Any speed
D. Certain specific speed
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A single point thread cutting tool should ideally have
A. Zero rake angle
B. Positive rake angle
C. Negative rake angle
D. Point angle
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During normalizing process of steel, the specimen is heated
A. Between the upper and lower critical temperature and cooled in still air.
B. Above the upper critical temperature and cooled in furnace.
C. Above the upper critical temperature and cooled in still air.
D. Between the upper and lower critical temperature and cooled in furnace.
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A grinding wheel becomes glazed (i.e. cutting edge takes a glass-like appearance) due to
A. Wear of bond
B. Breaking of abrasive grains
C. Wear of abrasive grains
D. Cracks on grinding wheel
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Calculate the weld per minute, work speed of circular electrode of 220 mm diameter for carrying out seam welding at 4 welds per cm on 1.6 mm thick mild steel tube. Welding cycle consists of 3 cycles ‘on’ and 2 cycles ‘off’ Power supply is at 50 Hz.
A. 3000 welds/min, 75 mm/min
B. 600 welds/min, 1500 mm/min
C. 500 welds/min, 1250 mm/min
D. 22 welds/min, 55 mm/min
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The helix angle of a drill is __________ for drilling brass.
A. Equal to 30°
B. Less than 30°
C. More than 30°
D. None of these
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The effect of setting a boring tool above center height leads to
A. Increase in the effective rake angle and a decrease in the effective clearance angle
B. Increase in both effective rake angle and effective clearance angle
C. Decrease in the effective rake angle and an increase in the effective clearance angle
D. Decrease in both effective rake angle and effective clearance angle
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The correct sequence of tool materials in increasing order of their ability to retain their hot hardness is
A. Carbide, ceramic, cermet, borazon
B. Ceramic, carbide, borazon, cermet
C. Cermet, carbide, ceramic, borazon
D. Borazon, ceramic, carbide, cermet
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Tool life is generally better when
A. Grain size of the metal is large
B. Grain size of the metal is small
C. Hard constituents are present in the micro-structure of the tool material
D. None of the above
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High speed steel cutting tools operate at cutting speeds _________ than carbon steel tools.
A. 2 to 3 times lower
B. 2 to 3 times higher
C. 5 to 8 times higher
D. 8 to 20 times higher
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The drill spindles are provided with standard taper known as
A. Morse taper
B. Seller's taper
C. Chapman taper
D. Brown and Sharpe taper
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