This set of Engineering Metrology Multiple Choice Questions & Answers (MCQs) focuses on “Gauge Design”.
1. Which principle is related to Gauge design?
a) Rankin principle
b) Position principle
c) Taylor’s principle
d) Carnot Principle
Explanation: According to Taylor’s principle, “‘No Go’ and ‘Go’ gauges are designed to check the minimum and maximum material limits”. In gauge design, simplicity is the main aim as simple gauge can take measurements accurately and continuously.
2. ‘Go limit’ applied to which limit condition?
a) Maximum material limit
b) Minimum material limit
c) Lower limit of shaft and upper limit of hole
d) Moderate material limit
Explanation: ‘Go’ limit is applied to the limit corresponds to maximum material limit condition that is lower limit of hole and upper limit of shaft while ‘No Go’ limit is applied to minimum material condition that is upper limit of a hole and lower limit of a shaft.
3. Which of the following is true for plug gauges?
a) Size difference between ‘Go’ and ‘No Go’ plug gauges is greater than the tolerance of tested shaft or hole
b) Size difference between ‘Go’ and ‘No Go’ plug gauges is Equal to the tolerance of tested shaft or hole
c) Size difference between ‘Go’ and ‘No Go’ plug gauges is less than the tolerance of tested shaft or hole
d) Size difference between ‘Go’ and ‘No Go’ plug gauges more or less than the tolerance of tested shaft or hole
Explanation: In case of standard gauges, size difference between ‘Go’ and ‘No Go’ plug and snap gauges is equal to tolerance. To maintain size and adequate functioning of snap gauges, robustness and rigidity are the main features.
4. Which of the following is incorrect for the gauging faces of snap gauges?
a) Parallel to each other
b) Square to each other
c) Gauging point and work are in same plane
d) Work and gauging faces are at 60 degree
Explanation: Gauging faces of a gap and snap gauges are square and parallel to each other. If gauging diameter of component is larger than gap setting then it will produce welding action may lead to distortion in gauge are incorrect interpretation of reading.
5. Which of the following can’t be done by ‘Go’ plug gauges?
a) Ensure bore alignability
b) Controls diameter
c) Check straightness of hole
d) Check degree of ovality
Explanation: ‘Go’ plug gauge is preferably full length of hole hence straightness can be checked. ‘Go’ gauges can’t check degree of ovality. ‘No Go’ plug gauges are short and its function depends on the diameter and circularity of hole.
6. What is the effect of wear on the size of ‘Go’ snap gauges?
c) May increase or decrease
d) No effect
Explanation: Due to wear, size of ‘Go’ plug gauge decreased while size of ‘Go’ snap gauge is increased. Absolute accurate gauge can’t be made by gauge makers. So, it is important to assign some deviation to gauges.
7. What is the use of ‘No Go’ gauges?
a) Check a single element of a feature
b) Check several dimensions simultaneously
c) Check roundness and size at the same time
d) Check location and size at the same time
Explanation: ‘No Go’ gauge should check only one feature at a time. A separate ‘No Go’ gauge is needed for each different individual dimension. ‘Go gauges’ are complex gauges can check several related dimensions simultaneously.
8. Which deviations are provided to a new ‘Go’ plug gauge from the nominal size?
a) One positive deviation
b) One negative deviation
c) Two positive deviations
d) Two negative deviations
Explanation: A new ‘Go’ snap gauge is made with two negative deviations while a new ‘Go’ plug gauge is made with two positive deviations from the nominal size.
9. Which of the following option is correct for the given statements about Gauge design?
Statement 1: ‘No Go’ gauges should put in the condition of maximum impassability in the inspection.
Statement 2: ‘Go’ plug gauge corresponds to a minimum limit.
a) T, F
b) F, F
c) T, T
d) F, T
Explanation: ‘Go’ plug gauge corresponds to the minimum limit of the hole, while the ‘No Go’ gauge is the size of maximum limit. But ‘Go’ snap gauge is of maximum limit of shaft and ‘No Go’ corresponds to a minimum limit.
10. If work tolerance is less than 0.09 mm then how much wear tolerance is applied to ‘Go’ gauge?
Explanation: There is no need of giving allowance for wear when work tolerance is less than 0.09 mm. But, if work tolerance is more than 0.09 mm then 10% tolerance is only given to the ‘Go’ gauge for wear.
Sanfoundry Global Education & Learning Series – Engineering Metrology.
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