601. Assertion (A) : The ratio of uncut chip thickness to actual chip thickness is always less than one and is termed as cutting ratio in orthogonal cutting.
     Reason (R) : The frictional force is very high due to the occurrence of sticking friction rather than sliding friction.
     

1. 1. Both A and R are true and R is the correct explanation of A
      

   
   
   

   2. Both A and R are true but R is not a correct explanation of A
      

   
   
   

   3. A is true but R is false
      

   
   
   

   4. A is false but R is true

   
   
   

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1. View Hint View Answer Discuss in Forum

   Sliding friction is very higher

   Correct Option: C

   Sliding friction is very higher

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602. Match List-I (Cutting tool materials) with ListII (Manufacturing methods) and select the correct answer using the codes given below :
     

     List-I	List-II
     A. HSS	1. Casting
     B. Satellite	2. Forging
     C. Cemented carbide	3. Rolling
     D. UCON	4. Extrusion
     	5. Powder metallurgy

     
     

1. 1. A - 3 , B - 1 , C - 5 , D - 2
      

   
   
   

   2. A - 2 , B - 5 , C - 4 , D - 3
      

   
   
   

   3. A - 3 , B - 5 , C - 4 , D - 2
      

   
   
   

   4. A - 2 , B - 1 , C - 5 , D - 3

   
   
   

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1. View Hint View Answer Discuss in Forum

   HSS – Forging Stellite – Casting Cementite – Powder metallurgy UCON – Rolling

   Correct Option: D

   HSS – Forging Stellite – Casting Cementite – Powder metallurgy UCON – Rolling

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603. Match List-I with List-II and select the correct answer using the codes given below :
     

     List-I	List-II
     A. Plane approach angle	1.Tool face
     B. Rake angle	2.Tool flank
     C. Clearances angle	3.Tool face and flank
     D. Wedge angle	4.Cutting edge
     	5.Tool nose

     
     

1. 1. A - 1 , B - 4 , C - 2 , D - 5
      

   
   
   

   2. A - 4 , B - 1 , C - 3 , D - 2
      

   
   
   

   3. A - 4 , B - 1 , C - 2 , D - 3
      

   
   
   

   4. A - 1 , B - 4 , C - 3 , D - 5

   
   
   

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1. View Hint View Answer Discuss in Forum

   
   

   Correct Option: C

   
   

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604. Consider the following statements: During the third stage of tool wear, rapid deterioration of tool edge takes place because
     1. Flank wear is only marginal
     2. Flank wear is large
     3. Temperature of the tool increases gradually
     4. Temperature of the tool increases drastically
     Which of the statements given above are correct?
     

1. 1. 1 and 3
      

   
   
   

   2. 2 and 4
      

   
   
   

   3. 1 and 4
      

   
   
   

   4. 2 and 3

   
   
   

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1. View Hint View Answer Discuss in Forum

   

   Correct Option: B

   

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605. In a machining operation chip thickness ratio is 0.3 and the back rake angle of the tool is 10°. What is the value of the shear strain?
     

1. 1. 0.31
      

   
   
   

   2. 0.13
      

   
   
   

   3. 3.00
      

   
   
   

   4. 3.34
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   r = 0.3 =	t1	, α = 10°
   	t2

   
   

   tanφ =	rcosα
   	1 - rsinα

   
   

   tanφ =	0.3cos10°
   	1 - 0.3sin10°

   
   φ = 17.3°
   Shear strain = tan (φ – α) + cot φ
   Shear strain = tan (17.3 – 10) + cot 17.3
   Shear strain = 3.34

   Correct Option: D

   r = 0.3 =	t1	, α = 10°
   	t2

   
   

   tanφ =	rcosα
   	1 - rsinα

   
   

   tanφ =	0.3cos10°
   	1 - 0.3sin10°

   
   φ = 17.3°
   Shear strain = tan (φ – α) + cot φ
   Shear strain = tan (17.3 – 10) + cot 17.3
   Shear strain = 3.34

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