# Instrumentation Transducers Questions and Answers – Displacement to Pressure Transducers

This set of Instrumentation Transducers Questions and Answers for Experienced people focuses on “Displacement to Pressure Transducers”.

1. Which of the following uses displacement to pressure conversion?
a) Flapper nozzle system
b) Gyroscope
c) Viscometer
d) None of the mentioned

Explanation: Flapper nozzle system is an example of displacement to pressure conversion system, in which displacement between flapper and nozzle is proportional to the pressure of outflow.

2. Displacement to pressure systems are used for measuring ___________
a) Displacement
b) Velocity
c) Acceleration
d) Force

Explanation: In displacement to pressure conversion system, Pressure corresponding to displacement is measured.

3. Which of the following represents the correct relation between pressure and displacement in flapper nozzle system?
a) Direct proportionality
b) Inverse proportionality
c) Equal
d) None of the mentioned

Explanation: In flapper nozzle system, as the displacement between flapper and nozzle increases, pressure decreases.

4. Which of the following represents normal value for Pout/Pin?
a) Less than 0.2
b) Between 0.2 and 0.75
c) Between 0.75 and 1
d) Greater than 1

Explanation: Practically ratio of output pressure and input pressure has a value between 0.2 and 0.75.

5. Which of the following is correct for flapper nozzle system?
a) Used in hydraulic system only
b) Used in pneumatic system only
c) Used in both hydraulic and pneumatic system
d) None of the mentioned

Explanation: Flapper nozzle system can be used in both hydraulic and pneumatic systems.
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6. Range of displacement of flapper required to change output pressure over the useful range is known as ___________
a) Cut-off displacement
b) Throttling range
c) Threshold value
d) Break value

Explanation: Value of the throttling range should be as low as 0.1mm.

7. Which of the condition is applicable for flapper nozzle system?
a) Measuring air should be free from dust
b) Measuring air must be of constant pressure
c) Measuring air should be of free from dust and of constant pressure
d) None of the mentioned

Explanation: For passing air through flapper nozzle system, it should be of constant pressure and free from any dust particles.

8. Which of the following represents condition for a volume of chamber?
a) As large as possible
b) Limited to 5 cc
c) AS small as possible
d) No limit

Explanation: Volume of the chamber is limited to 5cc for reducing the time constant.

9. Which of the following represents ideal flapper nozzle system?
a) Ratio of output and input pressure 0.75 at displacement = 0
b) Ratio of output and input pressure 1 at displacement = 0
c) Ratio of output and input pressure 0.5 at displacement = 0
d) Ratio of output and input pressure 0 at displacement = 0

Explanation: Ideally pressure of inflow and outflow are equal at zero displacement, that is the ratio of output and input pressure will be 1.

10. At which point of displacement pressure chara has maximum slope?
a) 0.14(di/dt)2
b) (di/dt)
c) 0.5(di/dt)2
d) None of the mentioned

Explanation: At displacement of 0.14(di/dt)2, displacement to pressure characteristic is found to have maximum slope.

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