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Process Control and Instrumentation

Process Control and Instrumentation
Identify an unbounded input from inputs whose transfer functions are given below

1
1/S
1/S²
1/(S² + 1)

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Process Control and Instrumentation
Which of the following is not a mechanical pressure sensing element?

Bellows
Bourdon tube
Diaphragm
U-tube

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Process Control and Instrumentation
A system with a double pole at the origin is unstable since the corresponding term in the time domain

Grows linearly with time
Decays linearly with time
Grows exponentially with time
Is a constant

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Process Control and Instrumentation
For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a

Small specific heat
All of these
Large area but small mass
High thermal conductivity

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

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

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Process Control and Instrumentation
Gain margin is equal to the

Gain in P-I controller
Amplitude ratio
Gain in P controller
Reciprocal of amplitude ratio

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