551. Which one is not a method of reducing cutting forces to prevent the overloading of press?

1. 1. providing shear on die

   
   
   

   2. providing shear on punch

   
   
   

   3. increasing the clearance

   
   
   

   4. stepping punches

   
   
   

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1. View Hint View Answer Discuss in Forum

   Shear decrease the maximum force but Energy Requirement remains the same.

   Correct Option: A

   Shear decrease the maximum force but Energy Requirement remains the same.

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552. For 50% penetration of work material, a punch with single shear equal to thickness will

1. 1. reduce the punch load to half the value

   
   
   

   2. increase the punch load by half the value

   
   
   

   3. maintain the same punch load

   
   
   

   4. reduce the punch load to quarter load

   
   
   

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1. View Hint View Answer Discuss in Forum

   Punch load = π Dt τ		P
   		t1

   
   t₁ = shear on punch.
   P = 50%
   

   Punch load = π Dt τ ×	0.5t
   	t

   
   ⇒  0.5 π Dt τ

   Correct Option: A

   Punch load = π Dt τ		P
   		t1

   
   t₁ = shear on punch.
   P = 50%
   

   Punch load = π Dt τ ×	0.5t
   	t

   
   ⇒  0.5 π Dt τ

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553. In producing a punched hole of 20 mm diameter the dimensions of the punch is _______ given the radial die clearance of 0.1 mm.

1. 1. Hole is inner profile so outer blade should be exact.

   
   
   

   2. Hole is inner profile so outer blade should not be exact.

   
   
   

   3. A & B

   
   
   

   4. None of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   Hole is inner profile so outer blade should be exact.

   Correct Option: E

   Hole is inner profile so outer blade should be exact.

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554. In blanking operation, the best way to improve the smoothness and secureness of the edges is to

1. 1. have reduced gap between punch and die

   
   
   

   2. increase the ductility of the sheet

   
   
   

   3. decrease the speed of blanking

   
   
   

   4. provide shear on the punch

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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555. In... A... operation the diameter of the desired hole will be smaller than the diameter of the... B...
     A. blanking/piercing
     B. punch/die

1. 1. A

   
   
   

   2. B

   
   
   

   3. A and B

   
   
   

   4. None of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   Procuring (B) Die

   Correct Option: A

   Procuring (B) Die

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