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Process Control and Instrumentation

Process Control and Instrumentation
Mercury thermometer can be used to measure the temperature upto __________ °C.

250
100
350
750

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Process Control and Instrumentation
The __________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.

All of these
Viscosity
Pressure
Volume

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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
All the thermocouples used for temperature measurement use dissimilar metal

Wires
Strips
Bars
Beads

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Process Control and Instrumentation
According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is

0°
90°
180°
45°

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Process Control and Instrumentation
__________ is undesirable in thermocouples used in industries,

Non-linear relation of emf to temperature
Oxidation resistance
Corrosion resistance
Linear relation of emf to temperature

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