166. Match the following
     List-I
     A. Cellulose coating
     B. Rutile coating
     C. Iron powder coating
     D. Basic coating
     List-II
     1. Alloying agent
     2. Absorb gasses
     3. Forming slag
     4. Shielding gasses

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

   
   
   

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

   
   
   

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

   
   
   

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

   
   
   

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1. View Hint View Answer Discuss in Forum

   A. Cellulose coating - Shielding gases
   B. Rutile coating - Foaming slag
   C. Iron Powder - Alloying Agent coating
   D. Basic coating - Absorb Gases
   

   Correct Option: A

   A. Cellulose coating - Shielding gases
   B. Rutile coating - Foaming slag
   C. Iron Powder - Alloying Agent coating
   D. Basic coating - Absorb Gases
   

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167. Which one of the following welding methods provides the highest heat flux(W/mm²)?

1. 1. Tungsten inert gas welding

   
   
   

   2. Laser beam welding

   
   
   

   3. Oxyacetylene gas welding

   
   
   

   4. Plasma arc welding

   
   
   

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1. View Hint View Answer Discuss in Forum

   In laser beam welding, heat flux is highest upto 1 mW/mm²

   Correct Option: B

   In laser beam welding, heat flux is highest upto 1 mW/mm²

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168. Heat is removed from a molten metal of mass 2 kg at a constant rate of 10 kW till it is completely solidified. The cooling curve is shown in the fig.
     
     Assuming uniform temperature throughout the volume of the metal during solidifications, the latent heat of fusion of the metal (in kJ/kg) is _______

1. 1. 50 kJ/kg

   
   
   

   2. 51 kJ/kg

   
   
   

   3. 52 kJ/kg

   
   
   

   4. 49 kJ/kg

   
   
   

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1. View Hint View Answer Discuss in Forum

   Heat Removed Rate = 10 KJ/s = 10 kW
   Time for Removal = (20 – 10) = 10 sec
   Latent Heat of fusion = 10 × 10
   

   = 100	kJ	× Sec = 100kJ
   	Sec

   
   but mass = 2 kg
   

   80 =	100	= 50 kJ/kg
   	2

   
   

   Correct Option: A

   Heat Removed Rate = 10 KJ/s = 10 kW
   Time for Removal = (20 – 10) = 10 sec
   Latent Heat of fusion = 10 × 10
   

   = 100	kJ	× Sec = 100kJ
   	Sec

   
   but mass = 2 kg
   

   80 =	100	= 50 kJ/kg
   	2

   
   

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169. Match the following metal forming processes with their associated stresses in the workpiece
     Metal forming process
     1. Coining
     2. Wire drawing
     3. Blanking
     4. Deep drawing
     Type of stress
     P. Tensile
     Q. Shear
     R. Tensile and compressive
     S. Compressive

1. 1. P Q R S
      2 3 4 1
      

   
   
   

   2. P Q R S
      1 2 3 4

   
   
   

   3. P Q R S
      2 4 3 1

   
   
   

   4. P Q R S
      1 3 2 4

   
   
   

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1. View Hint View Answer Discuss in Forum

   P – 2 Q – 3 R – 4 S – 1
   

   Correct Option: A

   P – 2 Q – 3 R – 4 S – 1
   

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170. Match the following:
     Group-I
     P. Wrinkling
     Q. Centre burst
     R. Barrelling
     S. Cold shut
     Group-II
     1. Upsetting
     2. Deep drawing
     3. Extrusion
     4. Closed die forging

1. 1. P Q R S
      2 3 4 1

   
   
   

   2. P Q R S
      3 4 1 2

   
   
   

   3. P Q R S
      2 3 1 4
      

   
   
   

   4. P Q R S
      2 4 3 1

   
   
   

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1. View Hint View Answer Discuss in Forum

   P – 2 Q – 3 R – 1 S – 4

   Correct Option: C

   P – 2 Q – 3 R – 1 S – 4

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