Calibration and Metrology Quiz

1. Before any adjustment: It shows the drift since the last calibration.
2. The tolerance is 4 times the measurement uncertainty: TUR = tolerance ÷ expanded uncertainty.
3. An unbroken chain of calibrations to national standards: Each link has stated uncertainty.
4. 0, 25, 50, 75 and 100 % of span: Often upscale and downscale.
5. 0.25 %: 0.04 ÷ 16 × 100 = 0.25 %.
6. Difference between upscale and downscale readings at the same input: Caused by friction and elastic effects.
7. At least 4 times more accurate than the instrument: A 4:1 ratio is the common target.
8. Testing and calibration laboratories: It sets lab competence requirements.
9. 95 % confidence: k = 2 is about 95 % for a normal distribution.
10. Rectangular: Half a digit, rectangular, divide by √3.
11. The digital reading against a reference input: Ranging changes which inputs give 4 and 20 mA, trimming corrects the measurement.
12. As found history: Extend if always in tolerance, shorten if drifting.
13. Pressure: Pressure = force of known weights ÷ piston area.
14. Temperature sensors: It provides a stable temperature for sensor comparison.
15. Deviation from a straight line between input and output: It is the maximum departure from the ideal straight line.

Yes. No sign up is needed and you can retake it as often as you like.

Yes. After you check your answers, each question shows the correct answer and a short explanation.

See the Interview Q&A section of instrumentationblog.in and the linked article below.