MCQOPTIONS
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MCQOPTIONS
This section includes 12 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. |
Which of the following is true for precision polygons? |
| A. | It is not possible to make a full calibration of the rotary table with one polygon |
| B. | Correction factor is applicable for reference to the exact centering |
| C. | Reflecting surfaces should be within 6 to 7 seconds of nominal angle |
| D. | Correction factor is not applicable when the centre of the mirror is used in calibration |
| Answer» B. Correction factor is applicable for reference to the exact centering | |
| 2. |
What is the flatness of reflecting faces of precision polygons? |
| A. | Within 0.0002 mm |
| B. | Within 0.0001 mm |
| C. | Within 0.0003 mm |
| D. | Within 0.0004 mm |
| Answer» C. Within 0.0003 mm | |
| 3. |
Which of the following option is true for the given statements about precision polygons?Statement 1: It may have unequal angles.Statement 2: Polygon with 12 sides is used for most of the works. |
| A. | T, F |
| B. | F, F |
| C. | T, T |
| D. | F, T |
| Answer» D. F, T | |
| 4. |
WHAT_IS_THE_FLATNESS_OF_REFLECTING_FACES_OF_PRECISION_POLYGONS??$ |
| A. | Within 0.0002 mm |
| B. | Within 0.0001 mm |
| C. | Within 0.0003 mm |
| D. | Within 0.0004 mm |
| Answer» C. Within 0.0003 mm | |
| 5. |
Which_of_the_following_is_true_for_precision_polygons?$ |
| A. | It is not possible to make a full calibration of the rotary table with one polygon |
| B. | Correction factor is applicable for reference to the exact centering |
| C. | Reflecting surfaces should be within 6 to 7 seconds of nominal angle |
| D. | Correction factor is not applicable when the centre of the mirror is used in calibration |
| Answer» B. Correction factor is applicable for reference to the exact centering | |
| 6. |
To what accuracy all face of a precision polygon made square to the bottom supporting surface? |
| A. | 2.5 µm |
| B. | 3.5 mm |
| C. | 2.5 mm |
| D. | 3.5 µm |
| Answer» B. 3.5 mm | |
| 7. |
What is the primary consideration in the accuracy of precision polygons? |
| A. | How closely the mirror agrees with nominal angle |
| B. | How closely the reflecting surface agrees with nominal angle |
| C. | Primary consideration for precision polygons is how square and flat it is or its surface |
| D. | How many sides polygon has having |
| Answer» D. How many sides polygon has having | |
| 8. |
What is the accuracy of top and supporting surface of type 3 precision polygon as per IS: 6987-1973? |
| A. | 0.005 and 0.04 mm |
| B. | 0.0025 and 0.005 |
| C. | 0.007 and 0.0035 |
| D. | 0.001 and 0.002 mm |
| Answer» B. 0.0025 and 0.005 | |
| 9. |
What is the dimension of polygon between top and supporting surfaces for a type 2 precision polygon as per IS: 6987-1973? |
| A. | 75 mm |
| B. | 150 mm |
| C. | 300 mm |
| D. | 600 mm |
| Answer» C. 300 mm | |
| 10. |
How many holes are provided in precision polygons for clamping purpose? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 11. |
What are the maximum numbers of faces a precision polygon can have? |
| A. | 30 |
| B. | 60 |
| C. | 90 |
| D. | 72 |
| Answer» E. | |
| 12. |
What is the maximum overall diameter for precision polygons? |
| A. | 100 mm |
| B. | 200 mm |
| C. | 300 mm |
| D. | 400 mm |
| Answer» D. 400 mm | |