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Process Control and Instrumentation

Process Control and Instrumentation
Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant)

V/nRT
p/nRT
nRT/V
nRT/P

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Process Control and Instrumentation
The temperature range for which copper resistance thermometer can be used is __________ °C

0 to 150
-200 to 150
350 to 750
500 to 900

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Process Control and Instrumentation
The transfer function for a P-D controller is

Kc/τD s
Kc τD s
Kc(1 +1/τD s)
Kc(1+τD s)

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Process Control and Instrumentation
Continuous measurement of moisture content of paper in paper industry is done by measuring the

Electrical resistance through the paper
None of these
Thermal conductivity through the paper
Magnetic susceptibility

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Process Control and Instrumentation
Which of the following thermocouples has the widest temperature measurement range?

Copper-constantan
Chromel-alumel
Iron-constantan
Platinum-platinum/rhodium

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Process Control and Instrumentation
The frequency response of a first order system, has a phase shift with lower and upper bounds given by

-π/2, π/2
-π/2, 0
0, π/2
- ∞, π/2

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