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Process Control and Instrumentation

Process Control and Instrumentation
Thermisters which have a very high temperature co-efficient of resistivity belong to the class of solid called

Insulators
Dielectrics
Semi conductors
Conductors

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Process Control and Instrumentation
0n-off control which is a special case of proportional control, has a band width of about __________ percent.

25
100
75

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Process Control and Instrumentation
Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 - 1600°C?

Thermocouples
Radiation pyrometer
Photoelectric pyrometer
Optical pyrometer

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Process Control and Instrumentation
Which of the following is not a differential pressure flow meter?

Orificemeter
Rotameter
Venturimeter
Flow nozzle

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Process Control and Instrumentation
The inverse Laplace transform of the function f(s) = 1/S(1 + S) is

1 - et
1 - e-t
1 + e-t
1 + et

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Process Control and Instrumentation
Liquid levels in autocalves are measued by

Differential float type manometer
None of these
Simple float
Glass gauge

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