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Process Control and Instrumentation

Process Control and Instrumentation
Flame photometry is used for the determination of compositional analysis of

Natural gas
Isotopes
Solids
Alkali metals

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Process Control and Instrumentation
The unit step response of the transfer function 1/(s² + 2s + 3)

Is unstable
Is overdamped
Has a damped oscillatory characteristics
Has a non-zero slope at the origin

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Process Control and Instrumentation
Flapper nozzle is used in a/an __________ controller.

Hydraulic
Pneumatic
None of these
Electronic

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Process Control and Instrumentation
Which thermocouple can be used to measure a temperature of around 1400°C ?

Copper-constantan
Aluminium-chromel
Platinum-platinum+rhodium
None of these

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Process Control and Instrumentation
A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is

1/√2
0.5
0.25
1

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Process Control and Instrumentation
Which of the following can measure temperatures in the range of - 20 to 300°C ?

Resistance thermometer
Mercury in glass thermometer
Vapor pressure thermometer
None of these

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