Engineering Metrology Questions and Answers – Plain Gauges

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

1. Which of the following is not correct about plain gauges?
a) Used to check threaded portions
b) There is no scale in plain gauges
c) Indicates actual value of the inspected dimension
d) Can be used to check dimension of manufactured part

Explanation: These gauges do not have any scale. These gauges are used only for determining that the inspected part is within a specified limit or not. They do not use to indicate actual value. Plain gauges are mostly used to check unthreaded shafts and holes.

2. What of the following option correctly define a solid gauge?
a) Gauging portion and handle separately manufactured
b) Gauge integral with the handle
c) Gauges with suitable locking devices
d) Gauges that are not used for cylindrical holes

Explanation: When the whole gauge is made from one single piece of metal or gauging portion is integral with the handle, such type of gauges are called solid gauges. Gauging portion and handle of ‘renewable type of gauge’ is separately manufactured.

3. What is the hardness of gauging portion in plain plug gauges?
a) 450 HV
b) 550 HV
c) 650 HV
d) 750 HV

Explanation: Gauging surfaces of plain plug gauges are suitably stabilized, lapped and ground. These surfaces are normally hardened to not less than 750 HV. For sizes up to 63 mm, double ended type of plug gauges are used, and for above 63 mm single ended are used.

4. Which of the following is not true for fixed gauges?
a) Independent of availability of power supply
b) These are not expensive
c) Chances of human errors are more
d) Provide uniform reference standard

Explanation: Fixed gauges are generally error free due to drift of the original adjustment, effect of variation of power, non-linear response etc. Human errors are almost nil except for careful handling. Auxiliary equipment and setups are not required.

5. Up to which diameter, bar type plug gauges are used?
a) 20 mm
b) 40 mm
c) 75 mm
d) More than 75 mm

Explanation: Plain plug gauges which are heavy or diameter more than 75 mm, it is common to use bar type or segmental gauges in this case. Gauge efficiency decrease if sensitiveness of user is impaired by weight.
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6. What is the suitable material for small plain plug gauges?
a) Any type of steel
b) Light metal alloys
c) Non-metallic handles may be used
d) Aluminum

Explanation: Suitable wear resisting steel is used to make gauging members of plain plug gauges. For heavy plain plug gauges, handle made of light metal alloys are used. For small plain plug gauges, suitable non-metallic handles may be used.

7. What is the colour of the band at ‘no go’ side of plain gauges?
a) Red
b) Blue
c) Green
d) Yellow

Explanation: To identify which end of the gauge is ‘No Go’ or ‘Go’ end, sometimes ‘No Go’ side is painted with red colour. Otherwise, the work ‘Go’ and ‘No Go’ are written on the handle of ‘Go’ and ‘No Go’ side respectively.

8. What is the range of size that can be checked by double-ended Rib type snap gauges?
a) 1 mm to 10 mm
b) 10 mm to 20 mm
c) 20 mm to 50 mm
d) 3 mm to 100 mm

Explanation: It is convenient to use double ended type rib snap gauges to check sizes of 3 mm to 100 mm. For size, 100 to 250 mm single ended progressive type snap gauges are used. Gauging surface are hardened up to 720 HV. Other surfaces are of smooth finish.

9. Which of the following option is correct regarding anvils of ‘adjustable type gap gauges’?
a) Gauging anvil has only sliding movement
b) Gauging anvil has only rotating movement
c) Gauging anvil has both sliding and rotating movement
d) Anvils are of non-adjustable type

Explanation: In adjustable type gap gauges, gauging anvils are adjustable endwise in the horse shoe frame. The gauging anvils of adjustable type snap gauges have only sliding movement that is no rotating movement for adjustment. A sufficient distance should be present between ‘Go’ and ‘No Go’ anvil.

10. What is the main use of contour gauges?
a) Check shape of irregular work
b) Check profiles
c) Check distance between surfaces
d) Check position of work

Explanation: Contour gauges are generally used to check dimensional accuracy and shape of irregular work e.g. radius gauges are used to check fillet shape. Simple contour gauges are used for thread pitches, form gear tooth profiles etc.

11. Which of the following option is correct for the given statements about plain plug gauges?
Statement 1: Cylindrical plugs are used for diameter above 100 mm.
Statement 2: For very large holes, spherically ended rods are used.
a) T, F
b) F, F
c) T, T
d) F, T

Explanation: Cylindrical plugs are not suitable for above 100 mm diameter, it is suitable to use spherical ended rods for such cases. Go gauges of 100 to 200 mm diameter can take the form of a cylindrical ended bar.

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