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Process Control and Instrumentation

Process Control and Instrumentation
Composition of natural gas is determined by the

Both B and C
Haldane apparatus
Chromatograph
Mass spectrometer

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Process Control and Instrumentation
Number of poles in a system with transfer function 1/(s² + 2s² + 1) is

2
5
1
3

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Process Control and Instrumentation
Which of the following instruments is not used for measuring sub-zero (<0°) temperatures?

Vapor pressure thermometer
Platinum resistance thermometer
Radiation pyrometer
Mercury in glass thermometer

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Process Control and Instrumentation
In second order underdamped system,

Decay ratio = overshoot
Decay ratio = (overshoot)²
Large damping co-efficient means smaller damping
Overshoot increases for increasing damping co-efficient

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Process Control and Instrumentation
According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is

90°
0°
180°
45°

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Process Control and Instrumentation
Smoke density of the flue gas going out of the chimney is measured by a

Chromatograph
Polarograph
Photo electric cell
Thermal conductivity meter

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