406. Cold working produces the following effects
     1. Stresses are set up in the material
     2. Grain structure get distorted
     3. Strength and hardness of the metal are increased
     4. Surface finish is reduced

1. 1. 1 and 2

   
   
   

   2. 1, 2 and 3

   
   
   

   3. 3 and 4

   
   
   

   4. 1 and 4

   
   
   

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1. View Hint View Answer Discuss in Forum

   Stress are build up due to strain hardening & Grain structure distortion.

   Correct Option: A

   Stress are build up due to strain hardening & Grain structure distortion.

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407. An annealed copper wire of 25 mm diameter is drawn into a wire of 5 mm diameter. The average yield stress in this operation if the curve of the material is given, σ = 315 ε ^0.54 MPa

1. 1. 592 MPa

   
   
   

   2. 458 MPa

   
   
   

   3. 342 MPa

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   True strain
   

   ε = In	Ai	= In	di	= In	25
   	Af		df		5

   
   ε = 3.22
   σ = 315 ε^0.54 = 315 (3.22)^0.54
   σ 592 MPa

   Correct Option: A

   True strain
   

   ε = In	Ai	= In	di	= In	25
   	Af		df		5

   
   ε = 3.22
   σ = 315 ε^0.54 = 315 (3.22)^0.54
   σ 592 MPa

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408. Which one of the following manufacturing processes requires the provision of 'gutters'?

1. 1. closed die forging

   
   
   

   2. centrifugal casting

   
   
   

   3. investment casting

   
   
   

   4. impact extrusion

   
   
   

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1. View Hint View Answer Discuss in Forum

   Gutters are used to settle down excess material.

   Correct Option: A

   Gutters are used to settle down excess material.

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409. Production process application
     List-I
     A. Extrusion
     B. Hot forging
     C. Metal spinning
     D. Explosive welding
     List-II
     1. Cladding of noble metal to base metal
     2. Long continuous metal tubes
     3. Connecting rod of IC engine
     4. Long flanged pipes
     5. House hold utensils.

1. 1. A – 2 B – 3 C – 5 D – 1

   
   
   

   2. A – 2 B – 3 C – 5 D – 4

   
   
   

   3. A – 2 B – 3 C – 4 D – 5

   
   
   

   4. A – 2 B – 4 C – 5 D – 1

   
   
   

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1. View Hint View Answer Discuss in Forum

   A – 2 B – 3 C – 5 D – 1

   Correct Option: C

   A – 2 B – 3 C – 5 D – 1

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410. To stress relieve a cold worked steel part, it is heated to a temperature close to.... A... and grain obtained after cooling are... B.
     A. lower critical temperature/upper critical temp
     B. fine/coarser

1. 1. A-upper critical temp B-coarser

   
   
   

   2. A-lower critical temperature B-causer

   
   
   

   3. A-upper critical temp B-fine

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   upper critical temp & causer grain structure.

   Correct Option: A

   upper critical temp & causer grain structure.

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