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

a) 1 mm
b) 10 mm
c) 100 mm
d) 10 cm

Explanation: At the intervals of 1 mm, graduated scales are accurately graduated.

2. Which of the following option is correct about given statement?
Statement 1: In conjunction with other instruments, graduated scales can be used for machine setting.
Statement 2: Graduated scales has fixed anvil.
a) T, T
b) F, T
c) T, F
d) F, F

Explanation: With micrometer microscope, graduated scales can be used for instrument and machine set to a high order of accuracy.

3. When glass block is tilted by ‘i’ in optical arrangement with a graduated scale, then find out the displacement of the ray. Given, width=5 mm, refractive index of glass block=1.5 and rotation is 10 mins.
a) 0.05 mm
b) 0.005 mm
c) 0.0005 mm
d) 0.00005 mm

Explanation: For very small angles, h=wi(Ref index-1/Ref index).

4. What is the accuracy range when Graduated scales are used with micrometer microscope?
a) ±1 micron
b) ±1/2 of a micron
c) ±1/4th of a micron
d) ±3/4th of a micron

Explanation: Use of microscope micrometer increases the accuracy of graduated scales. ±1/4th of a micron is the accuracy range when Graduated scales are used with micrometer microscope.

a) Scribed or etched marks are less preferable than paints
b) Telescope internal gauge has two spherical contact rods
c) Ball type plug gauge can detect ovality and taper effect
d) Pneumatic hole gauges are used for precision hole gauging

Explanation: Scribed and etched graduations are more preferable than inks. It is for the durability and accuracy of graduations.
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6. Which of the option is correct for given statements about graduated scales?
Statement 1: A microscope is fitted over the scale markings for machine setting.
Statement 2: This arrangement has a provision of the micrometer.
a) Only statement 1 is true
b) Only statement 2 is true
c) Both the statements are true
d) Both the statements are not true

Explanation: A microscope is fitted and setting lines are engraved on the microscope eyepiece. This arrangement has a micrometer provision to move the setting lines.

7. In optical arrangement with graduated scale, when glass block is tilted by ‘i’ then incident ray from scale deviates from straight line path. What is the displacement ‘h’? ( w is the glass width)
a) sin(i-r)/wcosr
b) w cos(i-r)/sinr
c) w sin(i-r)/cosr
d) cos(i-r)/wsinr

Explanation: Scale division is sensed in the same position when optical axis and glass block are perpendicular to each other. Then it travels a straight line. But when glass block is tilted then incident ray is refracted by ‘r’.

8. Match the following:

```A)	Cylindrical gauges              -      1) Small bores
B)	Telescope internal gauges       -      2) Deep bores
C)	Hemispherical gauge             -      3) Instrument setting
D)	Graduated scale                 -      4) Hole internal diameter```

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

Explanation: Telescope internal gauge, Hemispherical and Cylindrical gauges are used for internal measurements.

Statement 1: For the purpose of machine setting, an optical arrangement can be used with graduated scales.
Statement 2: Glass block is placed between the graduated scale and table.
a) T, F
b) F, F
c) F, T
d) T, T

Explanation: In this arrangement image of scale is optically moved. For this, a glass block is placed between scale and eyepiece.

10. Which of the option is correct for given statements about an optical arrangement with graduated scales?
Statement 1: There are more chances of cumulative error in optical arrangement with scales while using glass blocks.
Statement 2: High resolution over long length can be obtained by this method.
a) Only statement 1 is true
b) Only statement 2 is true
c) Both the statements are true
d) Both the statements are not true

Explanation: In this arrangement, rotation of glass block is easily calibrated due to high resolution. There will be more chances of cumulative errors with other methods.

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