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Process Instrumentation and Control - Interview Questions and Answers

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76. Dynamometers are :
A. force measuring devices
B. torque measuring devices
C. power measuring devices
D. energy measuring devices
E. displacement measuring devices.
Explanation:
77. Which gauge can be used to measure pressure below 1 |xm :
A. dead weight tester
B. pirani gauge
C. ionization gauge
D. McLeod gauge
E. absolute pressure sensor.
Explanation:
78. For measuring air flow, following meter is often used :
A. vane-type or anemometer
B. electro magnetic flow meter
C. vortex-shedding meter
D. ultrasonic flow meter
E. pitot tube.
Explanation:
79. Pick up false statement:
A. copper-constantan thermocouple is a stable couple resistant to both oxidis�ing and reducing atmosphere, but needs protection from acidic vapours
B. Iron-constantan thermocouple suffers from oxidation attack on iron wire, if exposed
C. iron-constantant couple can be made stable by using enamelled iron
D. Both wires of chromel-alumel ther-mocouples are prone to damage by sulphurous gases
E. copper-constantan thermocouple is used as a reference standard for calibration purposes.
Explanation:
80. An operation which, in the presence of a disturbing influence, tends to reduce the difference between the actual state of a system and an arbitrarily varied desired state and which does so on the basis of this difference, is called :
A. automatic control
B. feedback control
C. open feed back control
D. closed feed back control
E. self regulation.
Explanation:
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