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

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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 ?

81) For setting of tool for threading, it is aligned with the work by using

try square

centre gauge

thread plug gauge

template

Answer is:

centre gauge

Explanation:

For setting of tool for threading, it is aligned with the work by using centre gauge.

82) Which among the following statements in respect of threads / thread cutting is NOT correct ?

Threading tools are checked for accuracy for the 60 Degree angle by using a centre gauge

M 10 x 1.25 is a fine pitch thread

M 10 is a coarse pitch thread

Same tool is used for cutting external and internal threads

Answer is:

Same tool is used for cutting external and internal threads

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