# Engineering Metrology Questions and Answers – Vernier Height Gauges

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

1. Which of the following is incorrect for vernier height gauge?
a) Both the surfaces of measuring jaw should be at 45o to the base
b) These gauges can be used for scribing purposes
c) Removable clamps are used
d) Surface plate is used as datum surface for measurements

Explanation: Both surfaces of measuring jaw i.e. upper and lower are parallel to the base. It can be used for measurements under or over a surface. In place of measuring jaw, a scriber can be attached to scribe lines.

2. What is the hardness of measuring jaws of vernier height gauge made up of stainless steel?
a) 350 HV
b) 450 HV
c) 550 HV
d) 650 HV

Explanation: The measuring jaws, scriber and underside of a base are made up of good quality steel and high carbon stainless steel. Hardness of these parts is about 700 and 650 HV for good quality steel and stainless steel respectively.

3. Which of the following option is correct for the given statements about vernier height gauge?
Statement 1: The projection of scriber beyond the jaw should be 10 mm.
Statement 2: Flatness of working surface of scriber can be checked by the knife edge.
a) Only statement 1 is correct
b) Only statement 2 is correct
c) Both the statements are correct
d) Both the statements are incorrect

Explanation: The scriber is projected at least 25 mm beyond the jaws. Height gauges may also have an offset scriber. Flatness of working surfaces of scriber and measuring jaws is checked by knife edge straight edge or optical flats.

4. What is the standard reference temperature for the measurement of the accuracy of vernier height gauges?
a) 20 K
b) 20oC
c) 40 K
d) 40oC

Explanation: Temperature of 20oC should be maintained in the room where the test is conducted. A height gauge should rest on a precision surface plate to increase the testing accuracy.

5. Which of the following option is correct for the given statements about vernier height gauge?
Statement 1: Surface of the vernier and beam should have a dull finish.
Statement 2: Springing of measuring jaws is desirable.
a) T, F
b) F, F
c) T, T
d) F, T

Explanation: Surfaces of vernier and beam have a dull finish for easy readings. A magnifying lens is also provided for this purpose. A proper care of vernier height gauges is very important. Springing of jaws is always avoided.
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6. Which of the following is used for checking the perpendicular distance from the graduated face of a beam to the graduated face of vernier?
a) Angle gauge
b) Vernier depth gauge
c) Feeler gauge
d) Slip gauge

Explanation: It is measured with a 0.1 mm feeler gauge. Vernier depth gauges are used to measure the depth of holes and recesses.

7. Vernier is at which position when the scriber is coplanar with the base?
a) Vernier is exactly at the middle position of the scale
b) Vernier reads 1/4th of the scale
c) Vernier is at 3/4th position

Explanation: Scale on the beam is positioned in the manner that vernier reads zero when scriber and base are coplanar. In case of wear, some adjustments are made to reset zero position.

8. Match the following:
Column 1 is tolerance of guiding edge of the beam in mm and column 2 is for measuring range in mm.

```    Column 1                          Column 2
A) 0.02                -              1)    500
B) 0.04                -              2)    250
C) 0.06                -              3)    1000
D) 0.08                -              4)    750```

a) A-2, B-1, C-4, D-3
b) A-1, B-2, C-3, D-4
c) A-3, B-4, C-2, D-1
d) A-4, B-3, C-1, D-2

Explanation: The guiding edge and face of the beam should be perfectly flat. The face of the beam should be square to the base within 0.04 mm per 100 mm.

9. Which of the following is correct about vernier height gauges?
a) The scriber should preferably be of more depth than jaw
b) The perpendicular distance between scale graduations and vernier graduations should be more than 0.01 mm
c) The base is lapped up to an accuracy of 0.05 mm
d) Width of interval between adjacent lines should be 1/2 or 1/3 times of the length of shortest graduations

Explanation: Nominal depth of scriber should be same as measuring jaw so that it can be reversed. The base is ground and lapped up to 0.005 mm of accuracy and for this total span of a surface is considered.

10. What is the range of reading error for measuring a range of height gauges of 250 mm?
a) ±0.02
b) ±0.03
c) ±0.04
d) ±0.05

Explanation: The reading error should not exceed ±0.02 mm for measuring a range of height gauge of 250 mm, ±0.04 for more than 250 mm up to 750 mm and ±0.05 mm for more than 750 mm.

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