9) A Dia 6H7 hole is to be reamed in a steel workpiece. What size of drill will be required ?

5.5 mm

5.8 mm

6.0 mm

6.2 mm

Answer is:

5.8 mm

Drilling and Reaming MCQ - Machinist(Set-1) with Answers

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Related Drilling and Reaming MCQ - Machinist(Set-1) with Answers

10) The point angle of twist drill depends upon the

Cutting speed

Type of drilling machine

Size of the drill

Material to be drilled

Answer is:

Material to be drilled

Explanation:

The point angle of a general purpose (standard) drill is 118°. This is the angle between the cutting edges (lips). The angle varies according to the hardness of the material to be drilled.

The point angle of twist drill depends upon the

11) The point angle of twist drill for general purpose is

135 Degree

118 Degree

90 Degree

60 Degree

Answer is:

118 Degree

Explanation:

For general purpose use point angle of twist drill is 118 Degree.

The point angle of twist drill for general purpose is

12) The relief angle given behind the cutting lips is called

Lip clearance angle

Helix angle

Rake angle

Chisel edge angle

Answer is:

Lip clearance angle

The relief angle given behind the cutting lips is called

13) A hole of 10 mm diameter is to be finished with a hand reamer. The hole size required for reaming should be

9.75 mm

9.50 mm

9.25 mm

9.00 mm

Answer is:

9.75 mm

A hole of 10 mm diameter is to be finished with a hand reamer. The hole size required for reaming should be

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