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Process Control and Instrumentation

Process Control and Instrumentation
A manometer measures the __________ pressure.

Atmospheric
Gauge
Absolute
None of these

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Process Control and Instrumentation
A typical example of a physical system with under damped characteristic is a

Thermocouple kept immersed in a liquid filled thermowell
U-tube manometer
CSTR with first order reaction
Spring loaded diaphragm valve

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Process Control and Instrumentation
Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.

350
550
700
250

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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
The inverse Laplace transform of the function f(s) = 1/S(1 + S) is

1 + et
1 + e-t
1 - e-t
1 - et

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Process Control and Instrumentation
Response of a linear control system for a change in set point is called

Regulator problem
Servo problem
Frequency response
Transient response

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