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Process Control and Instrumentation

Process Control and Instrumentation
On-off controllers are normally used for

Low loads
Temperature changes
None of these
Flow rate changes

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Process Control and Instrumentation
Working principle of radiation pyrometer is based on the

Seebeck effect
Kirchoffs law
Stafan-Boltzman law
Wien's law

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Process Control and Instrumentation
Silver point temperature is __________ °C.

760.5
860.5
960.5
1060.5

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Process Control and Instrumentation
A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is

0.25
1/√2
0.5
1

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Process Control and Instrumentation
A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is

45°
-90°
-45°
-180°

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Process Control and Instrumentation
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with

A metal powder or graphite
Air
Mercury
Oil

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