666. The cutting length of the broach for the key way cutting in a 150 mm long east iron gear hub. Given that width of the key way is 9 mm depth of key way is 4.5 mm of finishing teeth = 4 and no. of semi finishing teeth = 8. Rise per tooth Pitch Roughing teeth 0.1 mm 22 mm Semi finishing 0.0125 mm 20 mm Finishing teeth 0 mm 20 mm
     

1. 1. 968 mm
      

   
   
   

   2. 160 mm
      

   
   
   

   3. 1208 mm
      

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: C

   NA

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667. A 60 deg symmetrical V tool is used in shaping at workpiece with a depth of cut of 0.1 mm and feed of 0.1 mm/stroke. The theoretical peak to valley height, in mm, of the surface produced is
     

1. 1. 0.043
      

   
   
   

   2. 0.067
      

   
   
   

   3. 0.086
      

   
   
   

   4. None of these

   
   
   

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   tan30° =	0.05
   	Hmax

   
   H_max = 86 microns = 0.086 mm

   Correct Option: C

   
   

   tan30° =	0.05
   	Hmax

   
   H_max = 86 microns = 0.086 mm

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668. The material most commonly used for manufacturing of machine tool beds is.
     

1. 1. MS
      

   
   
   

   2. Grey CI
      

   
   
   

   3. White CI
      

   
   
   

   4. Galvanized iron

   
   
   

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   Gray Cast Iron because of its damping nature and characteristic to absorb shock.

   Correct Option: B

   Gray Cast Iron because of its damping nature and characteristic to absorb shock.

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669. When the depth of cut in increased, the specific cutting energy
     

1. 1. Increases
      

   
   
   

   2. Decreases
      

   
   
   

   3. remains same
      

   
   
   

   4. Reaches an optimum value

   
   
   

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   Specific cutting energy =	Fc
   	W.t1

   
   t ↑ SCE ↓ t₁ → uncut chip thickness & depth of cut in orthogonal model

   Correct Option: B

   Specific cutting energy =	Fc
   	W.t1

   
   t ↑ SCE ↓ t₁ → uncut chip thickness & depth of cut in orthogonal model

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670. In HSS tool materials the element tungsten can be completely replaced, without changing the material property by
     

1. 1. Molybdenum
      

   
   
   

   2. Carbon
      

   
   
   

   3. Cobalt
      

   
   
   

   4. Vanadium

   
   
   

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   Molybdenum and Tungsten both increases hot hardness & abrasion Resistance.

   Correct Option: A

   Molybdenum and Tungsten both increases hot hardness & abrasion Resistance.

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