231. In an interchangeable assembly,a shaft of 20^+0.015-0.05 mm diameter and a hole of ^+0.025-0.010 mm diameter form a mating pair. In the worst assembly conditions, clearance between them will be

1. 1. 40 microns

   
   
   

   2. 30 microns

   
   
   

   3. 25 microns

   
   
   

   4. 15 microns

   
   
   

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1. View Hint View Answer Discuss in Forum

   In worst assembly condition, clearance will maximum
   Clearance (max) = Max hole dia – Minimum shaft diameter
   = 20.025 – 19.995 = 0.030 = 30 microns

   Correct Option: B

   In worst assembly condition, clearance will maximum
   Clearance (max) = Max hole dia – Minimum shaft diameter
   = 20.025 – 19.995 = 0.030 = 30 microns

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232. Diamond wheels should not be used for grinding steel components (T/F)

1. 1. True

   
   
   

   2. False

   
   
   

   3. NA

   
   
   

   4. NA

   
   
   

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1. View Hint View Answer Discuss in Forum

   True yes because carbon and steel having higher affinity to carbon (diamond) can diffuse in to the steel

   Correct Option: A

   True yes because carbon and steel having higher affinity to carbon (diamond) can diffuse in to the steel

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233. Plain milling of mild steel plates produces

1. 1. irregular shaped discontinuous chips

   
   
   

   2. regular shaped discontinuous chips

   
   
   

   3. continuous chips without BUE

   
   
   

   4. jointed chips

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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234. Cutting speed in grinding is set to a high value to

1. 1. Reduce the cutting time

   
   
   

   2. Increase the bond strength

   
   
   

   3. Improve cooling of job and wheel

   
   
   

   4. Reduce the wheel wear

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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235. The standard specification of a grinding wheel is A-46-M-6-V-21. It means a wheel of

1. 1. Aluminum oxide of mesh size 6

   
   
   

   2. Boron carbide of mesh size 46

   
   
   

   3. Aluminum oxide of mesh size 46

   
   
   

   4. Silicon carbide of mesh size 6

   
   
   

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1. View Hint View Answer Discuss in Forum

   

   Correct Option: C

   

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