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Process Control and Instrumentation

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

Flow rate changes
None of these
Low loads
Temperature changes

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

Polished surface
Low emissivity
Very thick walls
High transmissivity of radiation

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Process Control and Instrumentation
E.m.f. generated by thermocouples is of the order of

Microvolts
Millivolts
Kilo volts
Volts

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Process Control and Instrumentation
Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?

Carbon-tetrachloride
Mercury
Water
Methyl alcohal

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Process Control and Instrumentation
A control system has the following transfer function F(s) = (s - 1)(s + 1)/s(s - 2)(s + 4)The initial value of the corresponding time function is

43838
1
44020
-1

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Process Control and Instrumentation
The frequency response of a first order system, has a phase shift with lower and upper bounds given by

- ∞, π/2
0, π/2
-π/2, π/2
-π/2, 0

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