Engineering Metrology Practice Test 4

1. Which of the following is the use of Type-A optical flats?

Testing the flatness of measuring table

Testing parallelism of measuring anvils

Testing micrometer measuring surfaces

Testing parallelism of measuring devices

2. Which of the following is incorrect for electric multicheck?

Increase accuracy

Less chances of error

Eliminate manual inspection

High production rate

3. Which of the following option is correct regarding the characteristics of comparators?

Minimum inertia

Minimum compensation for temperature effect

Minimum versatility

High measuring pressure

4. Which of the following is true for testing flatness with optical flats?

Quartz flats are very sensitive to temperature changes

Number of bands appears is an indication of flatness

Bands are viewed as perpendicularly as possible

Too large angle of work with flat is desirable

5. What is the length of Prismatic grating?

300 mm

500 mm

200 mm

400 mm

6. Which of the following is measuring head sensitivity with the variation of diameter (D) of measuring orifice?

πD

πDL²

πD²L

πDL

7. In Back pressure type pneumatic gauge, there are two orifices. What is the relationship between upstream pressure of first orifice and pressure between two orifices?

Depends upon relative size of orifice

Distance between pressure source and first orifice

Only on geometric area of first orifice

Depends upon the distance between two orifice

8. What is the range of line spacings in gratings?

200 to 400 per mm

4 to 200 per mm

500 to 600 per mm

10 to 500 per mm

9. What is the tolerance on thickness for Type-B (Grade I) opticals flats?

0.15 µm

0.05 µm

0.20 µm

0.30 µm

10. 1 sec of arc will correspond to how much rise or fall in surface, when surface straightness is tested by autocollimator? (λ is the distance between centres of feet)

0.000006λ

0.00006λ

0.0006λ