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Process Control and Instrumentation

Process Control and Instrumentation
Thermistors are made of

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

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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
What is the Laplace transform of sin t ?

S/(s² + 1)
S/(s² - 1)
1/(s² + 1)
1/(s² - 1)

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Process Control and Instrumentation
Which of the following temperature measuring instruments need not touch the object whose temperature is being measured?

Thermo electric pyrometer
Mercury in glass thermometer
Filled system thermometer
Radiation/infrared pyrometer

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Process Control and Instrumentation
__________ is undesirable in thermocouples used in industries,

Oxidation resistance
Non-linear relation of emf to temperature
Corrosion resistance
Linear relation of emf to temperature

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Process Control and Instrumentation
A mercury barometer measures the __________ pressure.

Atmospheric
Absolute
Gauge
Vacuum

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