131. In which of the choices given below, the cutting tool materials are placed in the ascending order of permissible cutting speed for machining of steel?

1. 1. K group cemented carbide - P group cemented carbide - Ceramic - Cubic boron nitride

   
   
   

   2. Cubic boron nitride - K group cemented carbide - Cubic boron nitride - Ceramic

   
   
   

   3. P group cemented carbide - K group cemented carbide - Cubic boron nitride - Ceramic

   
   
   

   4. Ceramic - Cubic boron nitride - K group cemented carbide - P group cemented carbide
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   K – Group having higher cobalt content to higher transverse rapture strength hence higher speed.
   

   Correct Option: A

   K – Group having higher cobalt content to higher transverse rapture strength hence higher speed.
   

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132. The cutting portion of a drill is to be welded to its shank. The process best suited for this is

1. 1. ultrasonic welding

   
   
   

   2. electron beam welding

   
   
   

   3. friction welding

   
   
   

   4. laser welding

   
   
   

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1. View Hint View Answer Discuss in Forum

   Friction welding solid state welding softness due to rubbing action.
   

   Correct Option: C

   Friction welding solid state welding softness due to rubbing action.
   

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133. Mechanism
     1. Automobile
     2. Lathe
     3. Engraver
     4. Shaper
     5. Press
     Machine
     P. Pantograph
     Q. Quick return
     R. Ackermann
     S. Toggle
     

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

   
   
   

   2. P Q R S
      3 4 1 5

   
   
   

   3. P Q R S
      2 4 5 3
      

   
   
   

   4. P Q R S
      2 3 4 5

   
   
   

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1. View Hint View Answer Discuss in Forum

   P–3, Q–4, R–1, S–5

   Correct Option: B

   P–3, Q–4, R–1, S–5

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134. The purpose of helical grooves in a twist drill is to
     1. Improve the stiffness
     2. Save a tool material
     3. Provide space for chip removal
     4. Provide rake angle for the cutting edge
     Select the correct answer suing the codes given below:

1. 1. 1 and 2

   
   
   

   2. 2 and 3

   
   
   

   3. 3 and 4

   
   
   

   4. 1 and 4

   
   
   

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1. View Hint View Answer Discuss in Forum

   Flutes gives the chip removal space & also provide rake angle which is minimum at centre & equal to helix angle at periphery
   

   Correct Option: C

   Flutes gives the chip removal space & also provide rake angle which is minimum at centre & equal to helix angle at periphery
   

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135. Match List-I (Machine tool) with List-II (Machine tool part)
     List-I
     A. Lathe
     B. Milling machine
     C. Shaper
     D. Drilling machine
     List-II
     1. Lead screw
     2. Rocker arm
     3. Universal indexing
     4. Flute

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

   
   
   

   2. A B C D
      1 3 2 4

   
   
   

   3. A B C D
      4 3 2 1

   
   
   

   4. A B C D
      1 2 3 4

   
   
   

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1. View Hint View Answer Discuss in Forum

   A–1 B–3 C–2 D–4

   Correct Option: B

   A–1 B–3 C–2 D–4

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