151. In turning operation the surface finish can be improved by decreasing

1. 1. cutting speed

   
   
   

   2. feed per revolution

   
   
   

   3. rake angle

   
   
   

   4. Nose radius

   
   
   

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1. View Hint View Answer Discuss in Forum

   H max =	f²
   	8R

   
   Hmax ↓ f ↓

   Correct Option: B

   H max =	f²
   	8R

   
   Hmax ↓ f ↓

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152. Abrasives are not used in

1. 1. Buffering process

   
   
   

   2. Burnishing process

   
   
   

   3. Polishing process

   
   
   

   4. Super finishing process

   
   
   

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1. View Hint View Answer Discuss in Forum

   It is a rubbing process not a cutting process by abrasive particles

   Correct Option: B

   It is a rubbing process not a cutting process by abrasive particles

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153. Which pair amount the following solid state welding processes uses heat from an external source
     P. Diffusion welding
     Q. Friction welding
     R. Ultrasonic welding
     S. Forge welding

1. 1. P and R

   
   
   

   2. R and S

   
   
   

   3. Q and S

   
   
   

   4. P and S

   
   
   

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1. View Hint View Answer Discuss in Forum

   Diffusion & forge welding uses external heat source.

   Correct Option: D

   Diffusion & forge welding uses external heat source.

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154. Assertion (A): In electron beam welding process, vacuum is an essential process parameter. Reason
     (R): Vacuum provides a highly efficient shield on weld zone.

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

   EBW is carried out in vacuum to avoid dispersion or deviation from the focus.

   Correct Option: C

   EBW is carried out in vacuum to avoid dispersion or deviation from the focus.

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155. Assertion (A): A sound welded joint should not only be strong enough but should also exhibits a good amount of ductility. Reason
     (R): Welding process is used for fabricating mild Steel components only.

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

   Welding can be used for variety of material even it can be used for dissimilar materials.
   

   Correct Option: C

   Welding can be used for variety of material even it can be used for dissimilar materials.
   

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