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Process Instrumentation and Control - Interview Questions and Answers

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66. Pick up false statement about pressure measurements :
A. low pressure is normally measured by manometers
B. medium pressure by diaphragms or bellows
C. medium and high pressure by Bourdon gauge
D. all pressures by transducers
E. absolute pressure by piezoelectric crystal.
Explanation:
67. Pick out false statement about disadvantages of orifice plates :
A. square root relationship
B. poor turn-down ratio
C. critical installation requirements
D. short-term reliability
E. high irrecoverable pressure loss.
Explanation:
68. Vena-contracta taps are employed :
A. D upstream and D downstream from the plate
B. D upstream and at vena contracta
C. 2 D upstream and at vena contracta
D. just at surface of plate upstream and at vena contracta
E. any one of the above.
Explanation:
69. To prevent self-heating errors becoming too great, the current through platinum element (100 ohm) is kept at a very small value :
A. 0.1 raA
B. 1 mA
C. 5 mA
D. 20 mA
E. 50 mA.
Explanation:
70. In some measurements, in order to increase the sensitivity, two measuring and two reference cells are often used. This arrange ment is usually referred to as :
A. wheatstone bridge
B. katharometer
C. attenuator
D. amplifier
E. Kelvin bridge.
Explanation:
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