A jig is a special device

66) The tumbler gear in the feed mechanism of lathe is provided

To change the tool post

To change the direction of the lead screw

To change the direction of the chuck

To change the spindle speed

Answer is:

To change the direction of the lead screw

Explanation:

The tumbler gear unit consists of three gears, having the same number of teeth and it connects the spindle gear to the fixed gear. Tumbler gear unit is also called the reversing gear unit as it is used to change the direction of feed of the tool for the same direction of rotation of the spindle. Tumbler gear unit can be engaged and disengaged with the fixed stud gear by the operation of the hand lever provided in the unit.

67) If you have to turn the face of an irregularly shaped work piece, you should mount the piece

Answer is:

On a face plate

Explanation:

Faceplates are used to hold work that is too large or of such a shape that it cannot be held in a chuck or between centers. Faceplates are equipped with several slots to permit the use of bolts to secure the work, so that the axis of the work-piece may be aligned with the lathe centers. When work is mounted off – center, a counterbalance should be fastened to the faceplate to prevent imbalance and the resultant vibrations when the lathe is in operation.

68) Steel is an alloy of

Answer is:

Iron and carbon

Explanation:

69) Generally, gauges are used for

Measuring in mass production

Measuring the exact true dimension value

Getting a direct read out

Increasing accuracy of measurement over measuring instruments

Answer is:

Measuring in mass production

Explanation:

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A jig is a special device

Which locates and also guides the cutting tool

For More ISRO Technician-B Turner Question Paper - 2019 (Set-1) with Answer Key

Related ISRO Technician-B Turner Question Paper - 2019 (Set-1) with Answer Key

66) The tumbler gear in the feed mechanism of lathe is provided

To change the direction of the lead screw

67) If you have to turn the face of an irregularly shaped work piece, you should mount the piece

On a face plate

68) Steel is an alloy of

Iron and carbon

69) Generally, gauges are used for

Measuring in mass production

For More ISRO Technician-B Turner Question Paper - 2019 (Set-1) with Answer Key