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Process Control and Instrumentation

Process Control and Instrumentation
High temperature of around 2000°C of incandescent gas mantles is measured by a/an

Radiation pyrometer
Specially designed thermocouple
None of these Here
Optical pyrometer

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Process Control and Instrumentation
The transfer function of a pure dead time system with dead time τd is

Eτds
E-τds
Τds + 1
1/(τds + 1)

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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

-45°
45°
-180°
-90°

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Process Control and Instrumentation
A system with a double pole at the origin is unstable since the corresponding term in the time domain

Decays linearly with time
Grows linearly with time
Is a constant
Grows exponentially with time

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Process Control and Instrumentation
Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.

Optical
None of these
Photoelectric
Radiation

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Process Control and Instrumentation
Platinum resistance thermometer is the international standard for temperature measurement between

13.81°K to 903.9°K
Neither A nor B
Both A and B
Triple point of hydrogen and freezing point of antimony

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