76) Which among of the following methods can be used for cutting long and narrow external taper threads ?

Tailstock offset method

Taper turning attachment method

Compound rest method

Either 'A' or 'B'

Answer is:

Either 'A' or 'B'

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77) When using a yoke type taper turning attachment, the depth of cut is given by

cross slide

compound slide

tailstock

adjusting the tool

Answer is:

compound slide

78) Which one of the following methods is used to press the mandrel squarely to the workpiece ?

By hammering

By arbor press

By tailstock

By vice

Answer is:

By arbor press

79) Which among the following is the cause for incorrect pitch of thread during thread cutting with single point tool ?

Incorrect selection of change gears

Lead screw worn out

Half nut worn out

Any of the above

Answer is:

Any of the above

Explanation:

Incorrect pitch of thread during thread cutting with single point tool due to
Incorrect selection of change gears
Lead screw worn out
Half nut worn out

Which among the following is the cause for incorrect pitch of thread during thread cutting with single point tool ?

80) Which one of the following is the reason for torn threads while thread cutting on lathe ?

Blunt tool

Heavy depth of cut

Insufficient side clearance

Any of the above

Answer is:

Any of the above

Explanation:

Reason for torn threads while thread cutting on lathe can be due to
Blunt tool
Heavy depth of cut
Insufficient side clearance

Which one of the following is the reason for torn threads while thread cutting on lathe ?

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