This set of Engineering Metrology Multiple Choice Questions & Answers (MCQs) focuses on “Measurements of Limit Gauges”.
1. Which of the following is generally used to check the hardness of the gauging surface of screw ring gauges?
a) Rockwell hardness testing machine
b) Charpy hardness testing machine
c) Diamond pyramid machine
d) Scratch test
View Answer
Explanation: The hardness of the gauging surface of limit gauges may be generally measured on a hardness testing machine, preferably on the diamond pyramid machine. In certain types of gauges like screw and plane ring gauges, hardness is checked by means of a scratch test.
2. Up to which accuracy small gap gauges can be measured by using slip gauges?
a) ± 0.001 mm
b) ± 0.002 mm
c) ± 0.003 mm
d) ± 0.004 mm
View Answer
Explanation: Small gap gauges can be measured to an accuracy of ± 0.001 mm by using slip gauges and length bars but the accuracy of measurement of larger gap gauges is not so high, due to probable springing open of jaws when inserting the slip gauge combination.
3. What is the advantage of the use of slip gauge standards for dial comparators?
a) Size of the standard is equal to one of the limits of the plug gauge size
b) Size of the standard is greater than one of the limits of the plug gauge size
c) Size of the standard is less than one of the limits of the plug gauge size
d) Slip gauges are more accurate
View Answer
Explanation: The advantage of the slip gauge standards for dial comparators is that size of the standard is equal to one of the limits of the plug gauge size and hence the effect of errors of the comparator scale graduations is minimised.
4. Which of the following is not used to measure the plain plug gauges if the tolerance less than 0.025 mm?
a) Bench micrometer
b) Diameter measuring machine
c) Hand micrometer
d) High magnification dial comparator
View Answer
Explanation: If the tolerance on the plug gauge is less than 0.025 mm then, it is important to use more accurate measurement method. In such cases, bench micrometer or high magnification dial comparator or diameter measuring machine should be employed. In this case, hand micrometer can only measure over a limited range of size.
5. Which of the following is most convenient to measure the cylindrical ring gauges?
a) Slip gauges
b) Micrometer
c) Measurement by using rollers
d) Pneumatic comparators
View Answer
Explanation: Cylindrical ring gauges are most conveniently measured on pneumatic comparators; the taper and ovality of the gauges is quickly investigated and accuracy of the order of ± 0.001 mm is obtained by using pneumatic comparators.
6. What is the standard magnification used by an optical projector to inspect form of profile gauges?
a) 50
b) 100
c) 150
d) 200
View Answer
Explanation: Profile gauges are most conveniently inspected by optical projection at a standard magnification. The standard magnification mostly used is 50. Another standard magnification which can be used is 100 but it is generally not used due to reduced intensity of illumination at the projector screen, it is generally not greater than 50.
7. Which of the following statement is true for measurement of height and depth gauges?
Statement 1: These can be measured by comparators.
Statement 2: Gap of light method is not good for depth gauges.
a) T, T
b) T, F
c) F, F
d) F, T
View Answer
Explanation: Height and depth gauges can be measured by depth micrometers, bench micrometers or comparators. The recommended method for depth and height gauges is ‘gap of light’ method.
8. Which of the following is true for parallel screw plug gauges?
a) The minor diameter is measured by making a measurement on a diameter measuring machine between the flat ends of Vees
b) The flank angle is measured by making a measurement on a diameter measuring machine between the flat ends of Vees
c) The effective diameter is measured by making a measurement on a diameter measuring machine between the flat ends of Vees
d) Pitch is measured by making a measurement on a diameter measuring machine between the flat ends of Vees
View Answer
Explanation: The major diameter is obtained on the diameter measuring machine which is standardised in a similar way as bench micrometer. The minor diameter is measured on a diameter measuring machine between the flat ends of Vees which are placed in the thread groove on the gauge’s opposite sides.
9. Which of the following is best gauge/machine to inspect the parallel screw ring gauges?
a) Hand micrometer
b) Plug check gauges
c) Comparators
d) Bench micrometer
View Answer
Explanation: Screw ring gauges inspection by plug check gauges verifies that the ring gauges lie between their size limits. The major diameters are measured by inspection of the thread form which provides an indirect verification.
10. Which of the following is true for the measurement of taper ring gauges?
a) Taper ring gauges of sizes above the diameter of 20 mm are best measured by inserting precision balls of different sizes in the gauge
b) Taper ring gauges of sizes below the diameter of 20 mm are best measured by inserting precision balls of different sizes in the gauge
c) Taper ring gauges of size equal to the diameter of 20 mm are best measured by inserting precision balls of different sizes in the gauge
d) Taper ring gauges of all sizes are best measured by inserting precision balls of different sizes in the gauge
View Answer
Explanation: Taper ring gauges of diameter below than 20 mm are best measured by inserting precision balls of different sizes in the gauge and the distance between the top of each ball and one of the end faces of the gauge is measured.
Sanfoundry Global Education & Learning Series – Engineering Metrology.
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