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Process Control and Instrumentation

Process Control and Instrumentation
pH meter has

One cell
No cell
Three cells
Two cells

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Process Control and Instrumentation
Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.

350
550
700
250

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Process Control and Instrumentation
Dilatometer is used to measure

Strain
Contraction/expansion due to changes in temperature
Deflection
Stress

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Process Control and Instrumentation
Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C.

None of these
Bimetallic thermometer
Radiation pyrometer
Mercury thermometer

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Process Control and Instrumentation
Phase lag of the sinusoidal response of a first order system is

30°
120°
90°
180°

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Process Control and Instrumentation
A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in

Flux density
Current
Light intensity
Voltage

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