291. In a CNC milling operation, the tool has to machine the circular arc from point (20, 20) to (10, 10) at sequence number 5 of the CNC part program. If the center of the arc is at (20,10) and the machine has incremental mode of defining position coordinates, the correct tool path command is

1. 1. N05 G90 G01 X-10 Y-10 R10

   
   
   

   2. N05 G91 G03 X-10 Y-10 R10

   
   
   

   3. N05 G90 G03 X20 Y20 R10

   
   
   

   4. N05 G91 G02 X20 Y20 R10

   
   
   

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1. View Hint View Answer Discuss in Forum

   
   Radius of circle = 10
   Incremental system is used

   Correct Option: B

   
   Radius of circle = 10
   Incremental system is used

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292. A drill is positioned at point P and its has to proceed to point Q. The coordinates of point Q in the incremental system of defining position of a point in CNC part program will be
     

1. 1. (3,12)

   
   
   

   2. (5,7)

   
   
   

   3. (7,12)

   
   
   

   4. (4,7)

   
   
   

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1. View Hint View Answer Discuss in Forum

   

   Correct Option: D

   

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293. 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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1. View Hint View Answer Discuss in Forum

   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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294. 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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1. View Hint View Answer Discuss in Forum

   slip gauges

   Correct Option: D

   slip gauges

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295. 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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1. View Hint View Answer Discuss in Forum

   slip gauges and sine bar

   Correct Option: C

   slip gauges and sine bar

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