MDA REVISION 3

Name the tool used to produce an enlarged upper end of a drilled hole as shown.

• Twist drill bit.

• Counterboring drill.

• Countersinking drill.

• Chamfering twist drill.

The hole marked X, as shown in the figure, is a/an

• Oversized hole.

• Expanded hole.

• Counterbore hole.

• Countersunk hole.

What should you do when the drill is about to break through a work piece?

• Reduce the feed.

• Increase the feed.

• Reduce the speed.

• Increase the speed.

The tool used to manually cut a thread on a drill hole is the

• die

• tap

• countersink drill

• counterbore drill

The letter ‘X’ of the screw thread represents

• pitch

• depth

• minor diameter

• major diameter

The included angle ‘Y’ for ISO metric screw thread is

• 29⁰.

• 45⁰.

• 50⁰.

• 60⁰.

Which of the following tools should be used to produce a hole to accommodate a hexagonal bolt such that its head is flushed below the work surface?

• A reamer.

• A counterbore drill.

• A countersunk drill.

• A tapered shank drill.

What would be the most likely cause for a drilled hole to be oversized?

• Choked flute.

• Speed too slow.

• Drill spindle not running true.

• Lack of cutting fluid.

What is the tap drill size for the screw thread M10 x 1.5?

• 1.5 mm

• 8.5 mm

• 10. mm

• 11.5 mm

The washer, shown in the figure, is used when the fastener is

• subjected to vibration.

• sitting on a flat surface.

• inserted in a large hole.

• tightened against a hard surface.