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Process Instrumentation and Control - Interview Questions and Answers

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26. Pressure measuring devices are not based on:
A. measure of an equivalent height of liquid column
B. measure of the force exerted on a fixed area
C. measure of some change in electrical or physical characteristics of the fluid
D. area measurement by polar planimeter
E. all of the above.
Explanation:
27. Pick up the appropriate word for The reading displayed as a number, a series of holes on a punched card, or a sequence of pulses on magnetic tape :
A. pulse train
B. digital
C. analog
D. numeral
E. recording.
Explanation:
28. Which is not correct about load cells used to measure weight/force :
A. accuracy of the order of 0.01 to 1%
B. rugged and compact construction
C. no moving parts and negligible deflection under load
D. low resistance to side load and low overload withstand
E. hermetically sealed and thermal compensation.
Explanation:
29. Which type of device is suitable for dynamic force measurement:
A. lever balance
B. spring balance
C. proving ring
D. piezo-electric transducer
E. all of the above.
Explanation:
30. When the pressure medium to be measured is air or gas, the pipe is made to rise continuously to the gauge, so that:
A. no air or vapour can collect in pipe
B. any moisture can be drained '
C. moisture does not come in contact with elements of sensor/gauge
D. moisture can condense to form seal of water
E. static head error due to moisture is eliminated.
Explanation:
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