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Process Control and Instrumentation

Process Control and Instrumentation
Bimetal strips are not used in

Relays for opening & closing of electrical circuits
Thermocouples
Thermostats
Bimetallic thermometers

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

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

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Process Control and Instrumentation
A control system has the following transfer function F(s) = (s - 1)(s + 1)/s(s - 2)(s + 4)The initial value of the corresponding time function is

-1
44020
1
43838

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

Mass spectrometer
Chromatograph
Haldane apparatus
Both B and C

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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
1
0.25
0.5

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Process Control and Instrumentation
Which of the following is a 'contact' pyrometer?

Radiation pyrometer
Infra red pyrometer
Resistance pyrometer
Optical pyrometer

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