Which of the following centers is suitable while cutting taper by set over method?
a) Plain centre
b) Revolving centre
c) Half centre
d) Ball centre
To get least count of 5 in a Vernier bevel protractor, the 23 main scale are divided in to
a) 12 equal parts on a Vernier scale
b) 24 equal parts on a Vernier scale
c) 22 equal parts on a Vernier scale
d) 25 equal parts on a Vernier scale
Which one of the following statements indicates the principle followed in turning taper by offsetting the tail stock?
a) The work axis is kept out of alignment with the lathe axis and the tool movement are parallel to the lathe axis.
b) The work axis is kept in line with the lathe axis and the tool is made to move at an angle to the lathe axis.
c) The work axis is kept out of alignment with the lathe axis and the tool is made to move at angle to lathe axis.
d) The live and dead centers are moved in opposite directions to keep the work axis out of alignment with lathe axis.
Which one of the following methods of catching the threads consume more time when cutting odd pitch threads?
a) Using thread chasing dial
b) Reversing the machining
c) Predetermined travel of the carriage
d) Marking on work holding device & lead screw.
When power feed is engaged while turning taper using taper turning attachment, it is noticed that for short distance parallel turning takes place due to certain defect. Which one of the following is the cause of this defect?
a) The positioning of the T/T attachment is not correct
b) The too setting is not at centre height
c) Work piece is not rigidly held
d) Play between the sliding units
a) Plain centre
b) Revolving centre
c) Half centre
d) Ball centre
To get least count of 5 in a Vernier bevel protractor, the 23 main scale are divided in to
a) 12 equal parts on a Vernier scale
b) 24 equal parts on a Vernier scale
c) 22 equal parts on a Vernier scale
d) 25 equal parts on a Vernier scale
Which one of the following statements indicates the principle followed in turning taper by offsetting the tail stock?
a) The work axis is kept out of alignment with the lathe axis and the tool movement are parallel to the lathe axis.
b) The work axis is kept in line with the lathe axis and the tool is made to move at an angle to the lathe axis.
c) The work axis is kept out of alignment with the lathe axis and the tool is made to move at angle to lathe axis.
d) The live and dead centers are moved in opposite directions to keep the work axis out of alignment with lathe axis.
Which one of the following methods of catching the threads consume more time when cutting odd pitch threads?
a) Using thread chasing dial
b) Reversing the machining
c) Predetermined travel of the carriage
d) Marking on work holding device & lead screw.
When power feed is engaged while turning taper using taper turning attachment, it is noticed that for short distance parallel turning takes place due to certain defect. Which one of the following is the cause of this defect?
a) The positioning of the T/T attachment is not correct
b) The too setting is not at centre height
c) Work piece is not rigidly held
d) Play between the sliding units
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