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Process Control and Instrumentation

Process Control and Instrumentation
Use of I-control along with P-control facilitates

Reduction of offset
Reduction of stability time
None of these
Elimination of offset

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Process Control and Instrumentation
The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to

D³
D⁴
D
D²

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Process Control and Instrumentation
Dilatometer is used to measure

Contraction/expansion due to changes in temperature
Strain
Deflection
Stress

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Process Control and Instrumentation
Which thermocouple can be used to measure a temperature of around 1400°C ?

Copper-constantan
Platinum-platinum+rhodium
Aluminium-chromel
None of these

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Process Control and Instrumentation
Concentration of sugar solution can be determined by the

Polarimetry
Oscillometry
Flame photometry
Emission spectroscopy

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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

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

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