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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following is not a composition measuring instrument?

Hot wire anemometer
Mass spectrometer
Thermal conductivity cell
Polarograph

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Process Control and Instrumentation
Optical activity of a solution can be determined using a

Dilatometer
Polarimeter
Refractrometer
Polarograph

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Process Control and Instrumentation
A control system has the following transfer function F(s) = (s - 1)(s + 1)/s(s - 2)(s + 4)The initial value of the corresponding time function is

1
-1
43838
44020

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Process Control and Instrumentation
Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an

Conductor
Solid semi-conductor
Insulator
Liquid semi-conductor

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Process Control and Instrumentation
A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is

-90°
-180°
-45°
45°

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Process Control and Instrumentation
Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?

Nickel
Chromel
Brass
Invar

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