331. Internal gear cutting operation can be performed by

1. 1. milling

   
   
   

   2. shaping with rack cutter

   
   
   

   3. shaping with pinion cutter

   
   
   

   4. hobbing

   
   
   

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1. View Hint View Answer Discuss in Forum

   Internal gear cutting is performed by shaping with a pinion cutter.

   Correct Option: C

   Internal gear cutting is performed by shaping with a pinion cutter.

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332. Strong screw threads are produced by

1. 1. thread milling

   
   
   

   2. thread chasing

   
   
   

   3. thread cutting with single point tool

   
   
   

   4. thread rolling

   
   
   

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1. View Hint View Answer Discuss in Forum

   Thread rolling is forming process so work hardening takes place.

   Correct Option: D

   Thread rolling is forming process so work hardening takes place.

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333. Trepanning is performed for

1. 1. Finishing a drilled hole

   
   
   

   2. producing a large hole without drilling

   
   
   

   3. truing a hole for alignment

   
   
   

   4. enlarging a drilled hole

   
   
   

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1. View Hint View Answer Discuss in Forum

   

   Correct Option: B

   

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334. Determine the transformation ratio (TR) of the gear train connecting the spindle and the lead screw of 4TPI required to cut 1.0 mm pitch screw threads in a centre lathe.

1. 1. 20/127

   
   
   

   2. 20/126

   
   
   

   3. 20/125

   
   
   

   4. 20/120

   
   
   

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1. View Hint View Answer Discuss in Forum

   Transformation ratio = train value
   = pitch of job threads/pitch of lead screw threads
   = 1.0 mm/(1/4 inch) = (1.0 × 4)/(127/5)
   = 1 × 4 × 5/127 = 20/127. (The them 127/5 is used for converting inches into mm).

   Correct Option: A

   Transformation ratio = train value
   = pitch of job threads/pitch of lead screw threads
   = 1.0 mm/(1/4 inch) = (1.0 × 4)/(127/5)
   = 1 × 4 × 5/127 = 20/127. (The them 127/5 is used for converting inches into mm).

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335. Match the following
     Manufacturing process
     A. Finish turning
     B. Forming
     C. Thread cutting
     D. Down milling
     Conditions
     1. Backlash eliminator
     2. Zero rake
     3. Nose radius
     4. Low speed

1. 1. A–3, B–4, C–2, D–1.

   
   
   

   2. A–3, B–4, C–1, D–2.

   
   
   

   3. A–1, B–4, C–2, D–3.

   
   
   

   4. A–3, B–2, C–1, D–4.

   
   
   

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1. View Hint View Answer Discuss in Forum

   A–3, B–4, C–2, D–1.

   Correct Option: C

   A–3, B–4, C–2, D–1.

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