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Process Control and Instrumentation

Process Control and Instrumentation
The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.

500
250
1000
750

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Process Control and Instrumentation
Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.

Optical
Radiation
None of these
Photoelectric

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Process Control and Instrumentation
A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.

Nitrogen
None of these
Helium
Hydrogen

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Process Control and Instrumentation
The amplitude ratio for the sinusoidal response of __________ is < 1.

First order system
Transportation lag
None of these
Second order system

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Process Control and Instrumentation
What is the Laplace transform of sin t ?

1/(s² - 1)
1/(s² + 1)
S/(s² - 1)
S/(s² + 1)

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Process Control and Instrumentation
The transfer function of a process is 1/(16s² + 8s + 4). If a step change is introduced into the system, then the response will be

None of these
Over damped
Under damped
Critically damped

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