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Process Control and Instrumentation

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

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

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Process Control and Instrumentation
Thermistors are used in __________ devices.

Both B & C
Voltage measuring
Temperature measuring
Temperature compensating

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Process Control and Instrumentation
The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to

D²
D⁴
D
D³

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Process Control and Instrumentation
Zirconia probe is used for the continuous measurment of __________ flue gases going out of the furnace.

Carbon monoxide in
Temperature of
Carbon dioxide in
Oxygen in

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

Notches
Mouthpieces
Weirs
Orificemeters

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Process Control and Instrumentation
In second order underdamped system,

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

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