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Process Control and Instrumentation

Process Control and Instrumentation
Liquid levels in autocalves are measued by

Simple float
Differential float type manometer
Glass gauge
None of these

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Process Control and Instrumentation
The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is

π/3
π/6
5π/12
π/12

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Process Control and Instrumentation
The level of a liquid under pressure can be determined using

Differential pressure manometer
Diaphragm box system
Air-trap system
Bubbler system

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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
44020
1
43838

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Process Control and Instrumentation
Zirconia probe is used for the measurement of

% CO₂ in flue gas
% O₂ in flue gas
Speed of a submarine
Humidity of air

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

Drift
None of these
Dead zone
Static error

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