Comparator Test - 2 - Sanfoundry

1. 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?

Distance between pressure source and first orifice

Depends upon relative size of orifice

Only on geometric area of first orifice

Depends upon the distance between two orifice

2. For which diameter range of parts pneumatic gauges can be used?

100 to 600 mm

50 to 500 mm

50 to 700 mm

0.5 to 900 mm

3. After which frequency range, pneumatic measuring system is not correctly measured displacements?

2 cycles/second

5 cycles/second

3 cycles/second

4 cycles/second

4. Which of the following statement is true for pneumatic gauges?
Statement 1: Can be used to check multiple dimensions.
Statement 2: A float is present inside the bore.

F, T

T, F

T, T

F, F

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

πD

πD²L

πDL

πDL²

6. What is the formula for overall magnification of pneumatic comparator? (Where, λ is the length of scale of pressure measuring device and La is the average separation between nozzle surface and surface to be gauged)

0.4*λ/L_a

0.7*λ/L_a

0.4*λ*L_a

0.7*λ*L_a

7. Which of the following option is correct for velocity type pneumatic gauge?

Filter is placed after pressure reducing unit

Operate by sensing momentary rate of flow of air

Low amplification

Response speed is less than back pressure type

8. What is the order of magnification in flow type pneumatic gauge?

50 to 500 times

100 to 1000 times

500 to 5000 times

100 to 2000 times

9. What is the relation between overall magnification and pneumatic sensitivity in pneumatic comparators?

Overall magnification is directly dependent on the square of pneumatic sensitivity

Overall magnification is directly dependent on the pneumatic sensitivity

Overall magnification is inversely proportional to the pneumatic sensitivity

Independent of each other

10. Which of the following is not correct for pneumatic comparator?

Speedy operation

Independent of operator skill

Loss of accuracy due to gauge wear

Total life cost is less