The vernier bevel protractor is a precision instrument meant for measuring angles to an accuracy of 5 minutes.
The Least count of vernier bevel protractor is 5' (Five Minutes)
The value of each Vernier scale division of Vernier bevel protractor is 1 degree 55 minutes.
To get the least count of 5 minutes (5') in a vernier bevel protractor the 23 degree main scale is divided into 12 equal parts on vernier scale.
Following are the parts of a vernier bevel protractor.
Stock : – This is one of the contacting surfaces during the measurement of an angle. Preferably it should be kept in contact with the datum surface from which the angle is measured.
Dial:– The dial is an integrated part of the stock. It is circular in shape, and the edge is graduated in degrees.
Blade:- This is the other surface of the instrument that contacts the work during measurement. It is fixed to the dial with the help of the clamping lever. A parallel groove is provided in the centre of the blade to enable it to be longitudinally positioned whenever necessary.
Locking Screws:- Two knurled locking screws are provided, one to lock the dial to the disc, and the other to lock the blade to the dial.
20) The least count of Vernier bevel protractor is
Answer is:
5'
Explanation:
Related ISRO Technician-B Turner Question Paper - 2015 (Set - 1) with Answer Key
Answer is:
Adding the negative error in the actual reading
Explanation:
When outside micrometer has a negative error, correct reading can be taken by adding the negative error in the actual reading.
Answer is:
50.00 mm
Explanation:
The zero reading (minimum range) of the outside micrometer while measuring with a 50 to 75 mm micrometer is 50 mm.
Answer is:
Make surface flat so that bolt head can take proper seat on the surface
Explanation:
Spot facing is a machining operation for producing a flat seat for bolt head, washer or nut at the opening of a drilled hole. The tool is called a spot facer or a spot facing tool.
Spot facing is similar to counter-boring, except that it is shallower. Tools that are used for counter-boring can be used for spot facing as well.
