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Process Control and Instrumentation

Process Control and Instrumentation
Humidity of air can be determined by a

Mass spectrometer
Sling psychrometer
Chromatograph
Polarimeter

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Process Control and Instrumentation
Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1).

W = 1, Kc = 13
W = √(7/6), Kc = 46/3
W = 1/√14, Kc = 45/7√14
W = √(7/8), Kc = 45/4

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Process Control and Instrumentation
Which of the following filled system expansion thermometer has the capability to measure the lowest temperature?

Mercury in steel thermometer
Fused metal (Na or K) in steel thermometer
Alcohol in glass thermometer
Mercury in glass thermometer

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Process Control and Instrumentation
The __________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.

Viscosity
Volume
All of these
Pressure

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Process Control and Instrumentation
In second order underdamped system,

Large damping co-efficient means smaller damping
Decay ratio = overshoot
Decay ratio = (overshoot)²
Overshoot increases for increasing damping co-efficient

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Process Control and Instrumentation
Liquid discharge from a tank or reservoir can not be measured by

Weirs
Mouthpieces
Notches
Orificemeters

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