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Process Control and Instrumentation

Process Control and Instrumentation
Flame photometry is used for the determination of compositional analysis of

Solids
Isotopes
Natural gas
Alkali metals

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Process Control and Instrumentation
In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is

H/G
H(1 + G)
G/H
G/(1 + H)

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Process Control and Instrumentation
Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.

- 79 and 395
- 10 and 425
- 51 and 439
- 39 and 350

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Process Control and Instrumentation
Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is

Chromel-alumel
Either A, B or C
Platinum-platinum+rhodium
Iron-constantan

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

120°
180°
30°
90°

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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.

Mercury thermometer
None of these
Bimetallic thermometer
Radiation pyrometer

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