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Process Control and Instrumentation

Process Control and Instrumentation
The time constant of a first order process with resistance R and capacitance C is

1/RC
RC
R - C
R + C

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Process Control and Instrumentation
Which of the following judges the accuracy of an instrument?

Static error
Drift
None of these
Dead zone

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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

-1
1
43838
44020

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

High transmissivity of radiation
Polished surface
Low emissivity
Very thick walls

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Process Control and Instrumentation
Bode diagram is a plot of

AR vs. log (f) and Φ vs. log (f)
Log (AR) vs. f and log Φ vs.f
Log (AR) vs. log (f) and (Φ) vs. log (f)
None of these

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Process Control and Instrumentation
Hot wire anemometer is used for the measurement of

Flow rates of granular solids
Flow rates of fluids
Very high temperature
Thermal conductivity of gases

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