# Engineering Metrology Questions and Answers – Checking of Slip Gauges

This set of Engineering Metrology Multiple Choice Questions & Answers (MCQs) focuses on “Checking of Slip Gauges”.

1. Which of the following is generally used to calibrate slip gauges?
a) Micrometer
b) Collimator
c) Interferometer
d) Gap gauge

Explanation: As a result of handling in the labs or inspection workshops, slip gauge is responsible for displaying the signs of wearing after the appreciable period of use and therefore, should be checked or re-checked at regular intervals. It can be easily done with the help of millionth measuring machine such as Newall Interferometer.

2. Which of the following is true for checking of slip gauges with interferometer?
a) Both ends of gauges examined simultaneously
b) Right end is examined first
c) Left end is examined first
d) Any end can be examined after one another

Explanation: The absolute measurement and gauge comparison are done by an interferometer. It consists of a higher interferometer arranged in such a way that both ends of this type of gauge are checked simultaneously in the same area of view.

3. Up to which accuracy differences in length can be measured when slip gauges are calibrated by interferometer?
a) 0.02 mm
b) 0.002 mm
c) 0.0002 mm
d) 0.00002 mm

Explanation: The gauges show interference fringes across the faces at both ends after simple adjustment, and from the relative positions of these differences in length accuracy achieved is 0.00002 mm.

4. Which of the following is used to compute absolute length when slip gauges are calibrated by interferometer?
a) Scale
b) Slide rule
c) Scriber
d) Caliper

Explanation: The absolute length is computed with the special slide rule provided for this purpose and in Zeiss interferometer the corresponding linear measurement in microns is determined by special slide rule.

5. Which of the following is not a part of the instrument used for checking slip gauges?
a) Collimator
b) Monochromatic light source
c) White light source
d) Lens

Explanation: Arrangement contains a dual collimator, white light source and slit which provides white light. A monochromatic light source, condenser and a slit which provide monochromatic light.

6. How are mirrors arranged when lengths of two slip gauges are compared?
a) Mirrors are arranged in such a manner that both the end faces of slip gauges appear to overlap
b) Mirrors are arranged in such a manner that both the end faces of slip gauges appear separately
c) Lenses are arranged in such a manner that both the end faces of slip gauges appear to overlap
d) Lenses are arranged in such a manner that both the end faces of slip gauges appear separately

Explanation: Mirrors are arranged in such a manner that both the end faces of slip gauges appear to overlap, when lengths of two slip gauges are compared.

7. What is the main purpose of micrometer eyepiece in the instrument used to compare the lengths of two slip gauges?
a) Measure the fraction of bands
b) To read the fringe
c) Measure the length
d) To measure the width of fringe

Explanation: In the instrument used to compare lengths of two slip gauges a micrometer eyepiece is present which accurately measure the fractions of bands, but it is better to estimate the fraction.

8. Under what condition white light bands appear when a comparison of lengths of two slip gauges takes place?
a) Optical paths from dividing mirror are less
b) Optical paths from dividing mirror are more
c) Optical paths from dividing mirror are equal
d) Optical paths from dividing mirror can be more or less

Explanation: The standard gauge is adjusted so that the end faces of slip gauges are at an optical path distance from the dividing mirror when illuminated by the source of white light. Under these conditions the interference fringes appear are known as ‘white light band’. These are produced when the optical paths from the dividing mirror are same or equal.

9. Which of the following indicate the exact point of equality when the comparison of lengths of two slip gauges takes place?
a) A prominent white band
b) A prominent black band
c) A prominent black & white band
d) A prominent grey band

Explanation: A prominent black band indicates the exact point of equality which has other bands, fringed with colour on either side, successive bands being of minimised intensity until invisible.

10. Which of the following statement is true regarding Zeiss interferometer used for the measurement of slip gauges?
Statement 1: Zeiss interferometer is used for relative comparative measurement of slip gauges.
Statement 2: It uses three wavelengths of cadmium light.
a) T, F
b) F, F
c) T, T
d) F, T

Explanation: Zeiss interferometer is a compact instrument which is used for absolute comparative measurement of slip gauges. The absolute length of a slip gauge by this method can be determined by three methods (a) First is by comparison with a standard block. (b) second is by a combined measurement of 3 gauge blocks. (c) and the third is by measurement with a wrung-on gauges block.

Sanfoundry Global Education & Learning Series – Engineering Metrology.

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