The number of fundamental tolerance in the Indian Standard System are:

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ALP CBT 2 Fitter Previous Paper: Held on 21 Jan 2019 Shift 1
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  1. 16
  2. 15
  3. 18
  4. 14

Answer (Detailed Solution Below)

Option 3 : 18
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Explanation:

Limits and fits comprise 18 grades of fundamental tolerances for both shaft and hole, designated as IT01, IT0 and IT1 to IT16.

These are called standard tolerances.

Grades of Tolerance: Grade is an indication of the level of accuracy.

IT grades

Used for

IT01 to IT4 

For the production of gauges, plug gauges, measuring instruments

IT5 to IT7 

For fits in precision engineering applications

IT8 to IT11

For General Engineering

IT12 to IT14

For Sheet metal working or press working

IT15 to IT16

For processes like casting, general cutting

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