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Process Control and Instrumentation

Process Control and Instrumentation
The time constant of a first order process with resistance R and capacitance C is

RC
R + C
R - C
1/RC

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Process Control and Instrumentation
For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.

Difference
Sum
Product
Ratio

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Process Control and Instrumentation
Alphatron measures pressure __________ microns.

< 0.1
> 3
< 1
< 3

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Process Control and Instrumentation
The level of a liquid under pressure can be determined using

Differential pressure manometer
Bubbler system
Diaphragm box system
Air-trap system

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Process Control and Instrumentation
Temperature measuring instruments are standardised mostly with __________ points of pure substances.

Both A & B Here
Melting
Neither A nor B Here
Boiling

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Process Control and Instrumentation
Phase lag of the sinusoidal response of a first order system is

180°
120°
30°
90°

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