# Engineering Metrology Questions and Answers – Machine Tools Tests

This set of Engineering Metrology Multiple Choice Questions & Answers (MCQs) focuses on “Machine Tools Tests”.

1. In which plane the test for the level of installation of the machine takes place?
a) In vertical plane
b) In horizontal plane
c) In oblique plane
d) In both vertical and horizontal plane

Explanation: Surface accuracy depends upon the accuracy of mating elements which are present in machine tools. Test for the level of machine or installation of machine is done in both vertical and horizontal planes.

2. Which type of test is done on the main spindle of a machine?
a) True running
b) Alignment
c) Levelling
d) Flatness

Explanation: Test for the true running of the main spindle and axial movements are applied to any machine tool. True running of locating cylinder of main spindle and taper socket in main spindle is also of great importance.

3. What is the axial slip?
a) Axial spindle movement
b) Axial machine movement
c) Axial levelling of machine
d) Axial alignment of locating cylinder

Explanation: Axial slip is the axial spindle movement with follows the repeated pattern positively with each revolution. It is due to error in manufacturing. It is the only axial sliding movement which is tested and tolerances are applied only to this movement.

4. Which of the following is used to test leveling of machine bed?
a) Feeler gauge
b) Slip gauge
c) Sensitive spirit level
d) Mandrels

Explanation: Level of machine bed is generally tested by using sensitive spirit level in longitudinal and transverse direction. It is important that the machine should be installed truly in horizontal and vertical planes.

5. Which of the following is used to test straightness of bed in the transverse direction of long beds?
a) Autocollimator
b) Straight edge
c) Taut wire method
d) Spirit level

Explanation: In longitudinal direction, the test for straightness for the long beds can be determined by taut wire method, autocollimator, straight edge etc but in transverse direction it can be carried out only by using spirit level.
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6. Which of the following is not true about mandrels?
a) Used in alignment test
b) Mandrel between centres have has 2 reference marks
c) Mandrel of large diameter made tubular
d) Test mandrel with taper shanks has conical shanks

Explanation: Mandrels between centres type of mandrel has 4 reference marks which are located in 2 perpendicular axial planes and mandrels with larger diameter are tubular in shape to reduce weight, but it should be sufficiently rigid.

7. What kind of surface is produced if the axis of the spindle is not parallel to the bed in horizontal direction?
a) Straight
c) Tapered
d) Stepped

Explanation: If the spindle axis is not parallel to the bed horizontally then a tapered surface is produced.
To prevent tapering of surface in parallel direction spindle axis should be made parallel to the bed.

8. What is the deflection if mandrel (Taper shank) of working length 75 mm?
a) Less than 0.65 μm
b) Less than 0.75 μm
c) Less than 0.85 μm
d) Less than 0.95 μm

Explanation: The free end deflection of mandrels should be less than 0.65 μm for those having a working length of 75 mm and for those having a working length of 505 mm, it is less than 5.8μm.

Sanfoundry Global Education & Learning Series – Engineering Metrology.