MCQOPTIONS
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MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Metrology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Type-B optical flat is tested for parallelism. What is the formula for the difference of the thickness of the flat at 2 points on the adjacent fringe? (µ is the refractive index) |
| A. | λ/2*(1/µ) microns |
| B. | λ/4*(µ) microns |
| C. | λ*µ microns |
| D. | λ*(µ/2) microns |
| Answer» B. λ/4*(µ) microns | |
| 2. |
Which of the following is the method to test parallelism in Type-B optical flats? |
| A. | Hawking interferometer |
| B. | Enrico interferometer |
| C. | Fizeau interferometer |
| D. | Stephan interferometer |
| Answer» D. Stephan interferometer | |
| 3. |
Which of the following statement is true for optical flats?Statement 1: Type-A optical flats are tested for parallelism of working surfaces.Statement 2: Flatness of working surface is tested by comparing with a master flat. |
| A. | T, F |
| B. | F, F |
| C. | T, T |
| D. | F, T |
| Answer» E. | |
| 4. |
Which of the following is not the dimension of optical flat Type A as per IS : 5440—1969 in mm ? |
| A. | 25 x 10 |
| B. | 50 x 30 |
| C. | 30 x 10 |
| D. | 125 x 30 |
| Answer» D. 125 x 30 | |
| 5. |
Type-B optical flat is tested for parallelism. What is the formula for the difference of the thickness of the flat at 2 points on the adjacent fringe? (µ is the refractive index)$# |
| A. | λ/2*(1/µ) microns |
| B. | λ/4*(µ) microns |
| C. | λ*µ microns |
| D. | λ*(µ/2) microns |
| Answer» B. ‚âà√≠¬¨‚Ñ¢/4*(¬¨¬®¬¨¬µ) microns | |
| 6. |
Which_of_the_following_is_the_method_to_test_parallelism_in_Type-B_optical_flats?$ |
| A. | Hawking interferometer |
| B. | Enrico interferometer |
| C. | Fizeau interferometer |
| D. | Stephan interferometer |
| Answer» D. Stephan interferometer | |
| 7. |
Which of the following is of more important in case of Type-B optical flat? |
| A. | Thickness |
| B. | Diameter |
| C. | Length |
| D. | Area |
| Answer» B. Diameter | |
| 8. |
Which of the following is the use of Type-A optical flats? |
| A. | Testing parallelism of measuring devices |
| B. | Testing parallelism of measuring anvils |
| C. | Testing micrometer measuring surfaces |
| D. | Testing the flatness of measuring table |
| Answer» E. | |
| 9. |
Which of the following is the dimension for Type-B optical flats? |
| A. | 25.0 x 12.000 mm |
| B. | 25.0 x 23.000 mm |
| C. | 26.0 x 24.000 mm |
| D. | 26.0 x 24.250 mm |
| Answer» B. 25.0 x 23.000 mm | |
| 10. |
What is the tolerance on thickness for Type-B (Grade I) opticals flats? |
| A. | 0.05 µm |
| B. | 0.15 µm |
| C. | 0.20 µm |
| D. | 0.30 µm |
| Answer» D. 0.30 ¬¨¬®¬¨¬µm | |
| 11. |
Which of the following is not the dimension of optical flat Type A as per IS : 5440—1969 in mm ?$ |
| A. | 25 x 10 |
| B. | 50 x 30 |
| C. | 30 x 10 |
| D. | 125 x 30 |
| Answer» D. 125 x 30 | |
| 12. |
What is the tolerance on flatness for Type-A optical flats of sizes up to 100 mm? |
| A. | 0.05 cm |
| B. | 0.05 µm |
| C. | 0.05 mm |
| D. | 0.05 m |
| Answer» C. 0.05 mm | |
| 13. |
Working surfaces of Type-B optical flats are inclined to each other at which angle? |
| A. | 5 minute |
| B. | 10 minute |
| C. | 15 minute |
| D. | 20 minute |
| Answer» B. 10 minute | |
| 14. |
To what degree the edges of optical flats are bevelled? |
| A. | 30<sup>o</sup> |
| B. | 45<sup>o</sup> |
| C. | 60<sup>o</sup> |
| D. | 90<sup>o</sup> |
| Answer» C. 60<sup>o</sup> | |
| 15. |
What is the coefficient of linear expansion of fused quartz used to make optical flats? |
| A. | 0.6 x 10<sup>-6</sup>/ degree |
| B. | 0.6 x 10<sup>-5</sup>/ degree |
| C. | 0.6 x 10<sup>-4</sup>/ degree |
| D. | 0.6 x 10<sup>-3</sup> / degree |
| Answer» B. 0.6 x 10<sup>-5</sup>/ degree | |
| 16. |
Which of the following is used to make optical flats? |
| A. | Toughened glass |
| B. | Glass wool |
| C. | Fused quartz |
| D. | Porous glass |
| Answer» D. Porous glass | |
| 17. |
How many types of optical flats are present? |
| A. | 2 |
| B. | 1 |
| C. | 4 |
| D. | 3 |
| Answer» B. 1 | |