# Engineering Metrology Questions and Answers – End Standards

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

1. Which of the following is not end standard?
a) Precision scale
b) Length bars
c) Slip gauges
d) Gap gauges

Explanation: Precision scale is based on line standard. We employ end standards in workshops for all practical measurements.

2. What is the diameter of end bars?
a) 10 mm
b) 20 mm
c) 30 mm
d) 40 mm

Explanation: Length bar is the alternate name of end bars. These are round bar made of carbon steel of about 20 mm diameter.

3. What is the hardness of end bar at the ends?
a) 600 HV
b) 700 HV
c) 800 HV
d) 900 HV

Explanation: These are hardened up to 800 HV only at the ends. These are supported by ‘Airy points’.

4. Which of the following option is correct about given statements related to end standards?
Statement 1: It is possible to transfer line standard to end standard.
Statement 2: Size of end bars varies from 5 mm to 100 mm only.
a) T, F
b) F, F
c) T, T
d) F, T

Explanation: Size of end bars or length bars varies from 10 mm to 1200 mm. To transfer line standard correctly to the ends of the bar, Line standard comparator is used.

5. Which of the following is incorrect about end bars?
a) There are 4 grades of accuracy are available
b) Bars above 150 mm generally not found in a majority of engineering work

Explanation: 4 grades of accuracy are reference, calibration, inspection and workshop. Inspection and workshop both grades have internal threaded ends.
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6. What is the range of measurement of slip gauges when they are used with length bars?
a) 1200 mm
b) 1300 mm
c) 1400 mm
d) 1500 mm

Explanation: Slip gauges are used as end standards. When slip gauges are used in combination with end bars, there range of measurement is up to 1200 mm.

7. Which of the following is incorrect about end standards?
a) End of micrometer anvil is the end standard
b) It is difficult to form 2 parallel surfaces at the end of a bar
c) Slip gauges were made of more length than legal line standard
d) It is difficult to heat treat the ends

Explanation: End bars and slip gauges both were made of an equal length to the legal standard. End standards which are used in general measurement applications are very important.

8. Which of the following option is correct for given statements?
Statement 1: Displacement method can be used for comparison of an end gauge with a line standard.
Statement 2: In displacement method, there is no need for a microscope but a spirit level is required.
a) Only statement 1 is correct
b) Only statement 2 is correct
c) Both the statements are correct
d) Both the statements are not correct

Explanation: Displacement method utilizes a microscope. In this method, line standard is placed on a carrier and micrometer readings are taken by moving the carrier. After this, same is done for end standard.

9. Which of the following is correct about brookes level comparator?
a) It is used for sub-division of length standard
b) Must be kept at temperature 10oC for correct readings
c) A very accurate spirit level is used
d) Spirit level makes line contact on gauges

Explanation: It is used for sub-division of end standards. It is important to keep the room temp constant. This is important because some metals suffer a change in length when the temp is varied. Room must be kept at 20oC.

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