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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

D²
D³
D
D⁴

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Process Control and Instrumentation
Which of the following is never used as an element of industrial resistance thermometer?

Lead
30% iron + 70% nickel
Nickel
Copper

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Process Control and Instrumentation
Phase lag of the frequency response of a second order system to a sinusoidal forcing function

Is 30°
Is 120°
Is 90° at the most
Approaches 180° asymptotically

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Process Control and Instrumentation
E.m.f. generated by thermocouples is of the order of

Microvolts
Kilo volts
Volts
Millivolts

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Process Control and Instrumentation
Positioning controllers are used for

Flow rate changes
Low loads
Temperature changes
High loads

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Process Control and Instrumentation
Which of the following thermometers is not suitable for distant reading upto 60 metres?

Vapor pressure thermometer
Mercury in glass thermometer
Constant volume gas thermometer
Resistance thermometer

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