236. Abbe's principle of alignment states that the scale axis must coincide with line.

1. 1. False

   
   
   

   2. True

   
   
   

   3. False and True

   
   
   

   4. None of these

   
   
   

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   False
   Abbe’s principle of alignment states that the scale axis must be coincide with the axis of work piece.

   Correct Option: A

   False
   Abbe’s principle of alignment states that the scale axis must be coincide with the axis of work piece.

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237. Outside micrometer is calibrated with the help of

1. 1. inside micrometer

   
   
   

   2. depth micrometer

   
   
   

   3. ring gauges

   
   
   

   4. slip gauges

   
   
   

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   slip gauges

   Correct Option: D

   slip gauges

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238. For angle measurement in metrology, the following pair can be used in conjunction with each other

1. 1. sine bar and vernier calipers

   
   
   

   2. bevel protractor and slip gauges

   
   
   

   3. slip gauges and sine bar

   
   
   

   4. sine bar and bevel protractor

   
   
   

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   slip gauges and sine bar

   Correct Option: C

   slip gauges and sine bar

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239. Assertion (A): Basic hole system is advocated by Indian Standards for fit design.
     Explanation (E): Holes can be produced to any size

1. 1. Both A and E are correct and E explains A

   
   
   

   2. Both A and E are true but E does not explains A

   
   
   

   3. A is true but E is false

   
   
   

   4. A is false but E is true

   
   
   

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   Both A and E are correct and E explains A

   Correct Option: A

   Both A and E are correct and E explains A

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240. Flatness of slip gauges is checked with

1. 1. Interferometer

   
   
   

   2. Optical flat

   
   
   

   3. Electronic comparator

   
   
   

   4. Linear bar and bevel protractor

   
   
   

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   Interferometer

   Correct Option: A

   Interferometer

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