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Process Control and Instrumentation

Process Control and Instrumentation
Load cells are used for the measurement of

Strain
Velocity
Stress
Weight

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Process Control and Instrumentation
In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is

H(1 + G)
G/H
H/G
G/(1 + H)

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Process Control and Instrumentation
Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature

Both B and C Here
Emf produced is very low of the order of microvolt
Embrittlement of iron occurs
Rusting of iron takes place

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Process Control and Instrumentation
Dead zone in an instrument must be less than __________ percent of the scale.

1.5
8
0.2
4

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

R + C
1/RC
R - C
RC

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Process Control and Instrumentation
In second order underdamped system,

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

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