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Process Control and Instrumentation

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

D³
D
D²
D⁴

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Process Control and Instrumentation
Volumetric expansion is the working principle of the __________ thermometers.

Constant volume gas
Vapor pressure
Mercury in glass
Bimetallic

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Process Control and Instrumentation
In second order underdamped system,

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

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Process Control and Instrumentation
Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?

Joule heating effect
Seebeck effect
Peltier effect
Thomson effect

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Process Control and Instrumentation
Thermistors are made of

Metal oxides
Nickel-chromium alloys
Iron-copper alloys
Ultra pure metals

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Process Control and Instrumentation
For an input forcing function, X(t) = 2t², the Laplace transform of this function is

2/s³
4/s³
2/s²
4/s²

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