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Process Control and Instrumentation

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

Oscillometry
Flame photometry
Emission spectroscopy
Polarimetry

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Process Control and Instrumentation
Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the

Alcohol filled thermometer
Iron-constantan thermocouple
Optical pyrometer
Mercury in glass thermometer

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Process Control and Instrumentation
An amplitude ratio of 0.1 corresponds to __________ decibels.

20
10
-20
-10

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Process Control and Instrumentation
Thermal wells used in temperature measurements should have

Low emissivity
Polished surface
Very thick walls
High transmissivity of radiation

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Process Control and Instrumentation
Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?

Radiation pyrometer
Thermocouple
Mercury thermometer
Bimetallic thermometer

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Process Control and Instrumentation
The unit step response of the transfer function 1/(s² + 2s + 3)

Is overdamped
Is unstable
Has a non-zero slope at the origin
Has a damped oscillatory characteristics

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