Practice Test: Question Set - 25
1. A grinding wheel is said to be of _________ if the abrasive grains can be easily dislodged.
- (A) Soft grade
- (B) Medium
grade
- (C) Hard
grade
- (D) None
of these
2. The high cutting speed and large rake angle of the tool will result in the formation of
- (A) Continuous
chips
- (B) Discontinuous
chip
- (C) Continuous
chips with built up edge
- (D) None of
these
3. The facing is an operation of
- (A) Beveling the extreme end of a workpiece
- (B) Embossing
a diamond shaped pattern on the surface of a workpiece
- (C) Reducing
the diameter of a workpiece over a very narrow surface
- (D) Machining
the ends of a workpiece to produce a flat surface square with the axis
4. Fixtures are used
- (A) For
holding and guiding the tool in drilling, reaming or tapping operations
- (B) For
holding the work in milling, grinding, planing or turning operations
- (C) To
check the accuracy of workpiece
- (D) None
of the above
5. In a shaper, the length of stroke is increased by
- (A) Increasing
the centre distance of bull gear and crank pin
- (B) Decreasing
the centre distance of bull gear and crank pin
- (C) Increasing
the length of the arm
- (D) Decreasing
the length of the slot in the slotted lever
6. The hole to be drilled for tapping is _________ the outside diameter of the thread on the tap.
- (A) Equal to
- (B) Smaller than
- (C) Greater
than
- (D) None of
these
7. The obtuse angle, included between the chisel edge and the lip as viewed from the end of a drill, is called
- (A) Helix
or rake angle
- (B) Point
angle
- (C) Chisel
edge angle
- (D) Lip
clearance angle
8. The lip angle of a single point tool is usually
- (A) 20° to 40°
- (B) 40° to 60°
- (C) 60° to 80°
- (D) None of
these
9. Ceramic cutting tools are
- (A) Made
by cold pressing of aluminium oxide powder
- (B) Available
in the form of tips
- (C) Brittle
and have low bending strength
- (D) All of these
10. The point angle of a drill, for drilling stainless steel, is
- (A) 90°
- (B) 118°
- (C) 135°
- (D) 150°
11. In metal machining, the work-tool contact zone is a zone where heat is generated due to
- (A) Plastic
deformation of metal
- (B) Burnishing
friction
- (C) Friction
between the moving chip and the tool face
- (D) None
of the above
12. Which of the following operation is first performed?
- (A) Spot facing
- (B) Boring
- (C) Tapping
- (D) Drilling
13. The parameter which completely defines the chip formation in a metal cutting process is
- (A) Shear
angle
- (B) Chip-tool
contact length
- (C) Both (A) and
(B)
- (D) None
of these
14. The cutting speed of a drill depends upon the
- (A) Material of
drill
- (B) Type
of material to be drilled
- (C) Quality
of surface finish desired
- (D) All
of these
15. The addition of lead, sulphur and phosphorus to low carbon steels, help to
- (A) Reduce
built up edge
- (B) Break up
chips
- (C) Improve
machinability
- (D) All
of these
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