# Engineering Metrology Questions and Answers – Gauge Wear

This set of Engineering Metrology Multiple Choice Questions & Answers (MCQs) focuses on “Gauge Wear”.

1. In which gauges wear takes place more rapidly?
b) Plain gauges
c) Profile gauge
d) Go/nogo gauge

Explanation: Screw thread gauges wear more rapidly than plain gauges. When effective diameter NOT GO and full form GO ring gauges are used, manufacturing tolerance of work is reduced by the amount that must be allowed for wear in the full form ring gauges.

2. What is the common range of wear in ring thread gauge?
a) 0.0025mm – 0.005mm
b) 0.025mm – 0.05mm
c) 0.0025mm – 0.0075mm
d) 0.025mm – 0.075mm

Explanation: It is common for a hardened ring thread gauge to wear from 0.025 mm to 0.075 mm during a few days of operation. Gauge tolerance is adjusted in such a way that takes wear allowance into account.

3. What is the wear allowance recommended by BSI for solid ring and plug gauges?
a) 0.01mm
b) 0.5mm
c) 0.05mm
d) 0.001mm

Explanation: The allowance recommended by B.S.I, for wear on generally used solid ring and plug gauges is 0.002 inch (0.05 mm). Frequent checking of solid pattern gauges is necessary in order to obviate this effect.

4. What is the relation between the effective diameter of a thread hole and an effective diameter of the screw in screw thread gauge?
a) minimum effective diameter of a thread hole must necessarily be greater than the maximum effective diameter of the screw
b) maximum effective diameter of a thread hole must necessarily be greater than the minimum effective diameter of the screw
c) minimum effective diameter of a thread hole must necessarily be lesser than the maximum effective diameter of the screw
d) maximum effective diameter of a thread hole must necessarily be greater than the minimum effective diameter of the screw

Explanation: The minimum effective diameter of a thread hole must necessarily be greater than the maximum effective diameter of the screw. The pitch diameter (often called the effective diameter) of a parallel thread is the diameter of the imaginary co-axial cylinder which intersects the surface of the thread in such a manner that the intercept on a generator of the cylinder.

a) It is used for precision gauging purposes
b) It shows more gauge wear than solid gauge wear
c) It overcome the disadvantages by solid gauge wear
d) Its wear allowance is 0.0125mm

Explanation: In order to overcome the disadvantages of solid gauge wear, the adjustable pattern screw thread gauge was evolved which is widely employed for precision gauging purposes. Although wear can be compensated for but the B.S. allowance of 0.002″ (0.005mm) for solid gauges is reduced by about 0.0005″(0.0125mm).
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6. What is the provision for wear of Go gauges is made by?
a) A margin greater than maximum metal limit of work
b) A margin greater than tolerance zone of gauge
c) A margin lesser than maximum metal limit of work
d) A margin between tolerance zone of gauge and maximum metal limit of work

Explanation: ‘Go’ gauges provision for wear is made by the introduction of a margin between the maximum metal limit of the work and tolerance zone for the gauge. Wear should not be permitted beyond the maximum metal limit of the work, when the limit is of critical importance.

7. What is the magnitude of wear allowance in Go gauges in present British System?
a) One-fifth of gauge tolerance
b) One-third of gauge tolerance
c) One-tenth of gauge tolerance
d) One-fifteenth of gauge tolerance

Explanation: Wear allowance magnitude is one-tenth of the gauge tolerance. In British system dispenses with workshop and inspection gauges and we give the same tolerance limits on workshop and inspection gauges and the same gauges can be used for both purposes.

8. If work tolerance is less than 0.09mm, then how much wear allowance is given to Go gauge?
a) 5% gauge tolerance
b) No allowance
c) 1% gauge tolerance
d) 2.5% gauge tolerance

Explanation: When work tolerance is less than 0.09 mm there is no need of giving allowance for wear. 10% gauge tolerance is given only on ‘Go’ gauge for wear if work tolerance is more than 0.09 mm.

9. Where should tolerance zone is placed for Go Gauges in present British System?
a) Inside work limits
b) Outside work limits
c) Equal to work limits
d) Regardless to work limits

Explanation: The tolerance zone for the ‘Go’ gauges should be placed inside the work-limits. In First System, tolerances on the workshop gauge are arranged to fall inside the work tolerance, further ‘Go’ gauge should eat away 10% of work tolerance.

10. Where should tolerance zone is placed for No-Go Gauges in present British System?
a) Inside work limits
b) Outside work limits
c) Equal to work limits
d) Regardless to work limits

Explanation: The tolerance zone for the ‘No Go’ gauges should be placed outside the work-limits. In First System, inspection gauge tolerances fall outside the work tolerance and tolerance on No Go’ gauge should be one-tenth of work tolerance.

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